Morning Void Urine Samples Research Articles

Significantly Elevated Urinary OH-PAHs and Oxidative Damage Concentrations Attributable to PM2.5 Exposure: A Panel Study of Preaging Females in Chiang Mai, Thailand

Exposure to ambient particulate matter with an aerodynamic diameter ≤ 2.5 µm (PM2.5) has been associated with oxidative damage. This study investigated the PM2.5-bound polycyclic aromatic hydrocarbon (PAH) exposure levels during elevated PM2.5 levels and the oxidative damage among a preaging females in Chiang Mai, Thailand. The 64 female participants, aged between 50 and 65 years old, were followed for 5 weeks consecutively during the non-haze rainy season as the baseline and haze episodes. The morning void urine sample was collected weekly and analyzed for 8 species of hydroxylated-polycyclic aromatic hydrocarbons (OH-PAHs) and malondialdehyde (MDA). The results showed that the high increase in PM2.5 levels was positively associated with OH-PAH levels. In addition, for every 1 µg/gCre increase in individual urinary OH-PAH concentrations, the MDA concentration increased from 0.073 to 2.071 µg/gCre. Therefore, the present study suggested that detected urinary OH-PAHs were attributable to PM2.5-bound PAH exposure, particularly from inhalation. These study results provide useful information for policy makers and public health agencies to mitigate the chain effects of PM2.5 exposure from haze pollution. Keywords: Air pollution, Hydroxylated-PAHs, Oxidative stress, Urinary biomarkers

Urine andhair drug test results associated with daily consumption ofcodeine-predominant poppy seed food products.

This study examined the urine and hair opiate profiles associated with the daily consumption of presumptive codeine-predominant poppy seed food products. Ten participants consumed one of five food products at breakfast for 10 consecutive days. Baseline urine and hair samples were collected on Day 1. The urine samples were collected 4, 8 and 12 h following poppy seed consumption on Days 1 and 10, and the first morning void urine samples were collected on Days 2-10. A second hair specimen was collected on Day 20 ± 2. Urine drug test results: Three of the food products were associated with opiate-negative urine drug test results at all time points at a 300 ng/mL cut-off. Two of the food products were associated with opiate-positive drug test results at all non-baseline time points at a 300 ng/mL cut-off. Of these, all samples (n = 60) were codeine-positive, and 27 (45%) were morphine-positive. Codeine concentrations exceeded morphine concentrations in every sample and always by multiples. Thirty-nine of the 60 samples (65%) were codeine-positive at a 2,000 ng/mL cut-off, while none of these samples were morphine-positive at this cut-off. None of the 60 samples reached an opiate threshold of 15,000 ng/mL, although one participant produced a maximum codeine concentration of 13,161 ng/mL (13,854 ng/mg creatinine). There was no clear trend toward increasing urinary opiate concentrations over the course of the study. Hair drug test results: The hair samples of two participants produced quantifiable codeine (41 pg/mg and 51 pg/mg), but no sample reached a common reporting threshold of 200 pg/mg for codeine or morphine.

Urinary pesticide mixture patterns and exposure determinants in the adult population from the Netherlands and Switzerland: Application of a suspect screening approach

IntroductionNon-occupational sources of pesticide exposure may include domestic pesticide usage, diet, occupational exposure of household members, and agricultural activities in the residential area. We conducted a study with the ambition to characterize pesticide mixture patterns in a sample of the adult population of the Netherlands and Switzerland, using a suspect screening approach and to identify related exposure determinants. MethodsA total of 105 and 295 adults participated in the Dutch and Swiss studies, respectively. First morning void urine samples were collected and analyzed in the same laboratory. Harmonized questionnaires about personal characteristics, pesticide-related activities, and diet were administered. Detection rates and co-occurrence patterns were calculated to explore internal pesticide exposure patterns. Censored linear and logistic regression models were constructed to investigate the association between exposure and domestic pesticide usage, consumption of homegrown and organic foods, household members’ exposure, and distance to agricultural and forest areas. ResultsFrom the 37 detected biomarkers, 3 (acetamiprid (-CH2), chlorpropham (4-HSA), and flonicamid (-C2HN)) were detected in ≥40% of samples. The most frequent combination of biomarkers (acetamiprid-flonicamid) was detected in 22 (5.5%) samples. Regression models revealed an inverse association between high organic vegetable and fruit consumption and exposure to acetamiprid, chlorpropham, propamocarb (+O), and pyrimethanil (+O + SO3). Within-individual correlations in repeated samples (summer/winter) from the Netherlands were low (≤0.3), and no seasonal differences in average exposures were observed in Switzerland. ConclusionHigh consumption of organic fruit and vegetables was associated with lower pesticide exposure. In the two countries, detection rates and co-occurrence were typically low, and within-person variability was high. Our study results provide an indication for target biomarkers to include in future studies aimed at quantifying urinary exposure levels in European adult populations.

Albuminuria and markers for cardiovascular risk in 12-year-olds from the general Dutch population: a cross-sectional study

In adults, albuminuria represents a risk factor for cardiovascular disease and is associated with hypertension and obesity. Pediatric data from the general population are inconsistent and largely based on randomly collected urine. A possible association between antenatal programming and albuminuria at school age has still to be investigated. The purpose of this study is to assess albuminuria in first morning void urine samples in a population-based pediatric cohort and to investigate cross-sectionally the association with factors related to cardiovascular risk. Moreover, we investigate the possible association of antenatal factors with albuminuria. A first morning void urine sample was collected in the population-based GECKO (Groningen Expert Center for Kids with Obesity) Drenthe cohort at the age of 12 years. We investigated cross-sectionally associations between albuminuria and body mass index (BMI), waist circumference (WC), blood pressure (BP) and antenatal factors. The prevalence of UACR (urinary albumin-creatinine ratio) ≥ 3 mg/mmol was 3.3% (95%CI 2.3–4.2). In a multivariate linear regression model, UAC was negatively associated with z-BMI (β-0.08, p = 0.013) and positively with z-systolic BP (β 0.09, p = 0.006), model significance p = 0.002. UACR was negatively associated with z-BMI (β − 0.13, p < 0.001) and positively with z-diastolic BP (β 0.09, p = 0.003), model significance p = 0.001. Albuminuria was not significantly associated with antenatal factors such as gestational age and standardized birth weight.Conclusions: Albuminuria in first morning void urine in 12-year-olds has a lower prevalence than previously reported by randomly collected samples. A negative association between albuminuria and BMI is confirmed. A positive association with blood pressure, but no association with antenatal factors was found.What is known:• While, in adults, albuminuria is a recognized risk factor for cardiovascular disease and is associated with hypertension and obesity, pediatric data are inconsistent and largely based on randomly collected urine.• A possible association between antenatal programming and albuminuria at school age has still to be investigated.What is new:• In this population study on first morning void urine samples from 12-year-olds of the general population, albuminuria is negatively associated with body mass index, and positively associated with blood pressure, while there is no association with antenatal factors.• The prevalence of albuminuria at 12 years is lower than previously reported in studies based on randomly collected urine samples, probably due to elimination of orthostatic proteinuria.

#4868 MASS-SPECTROMETRY ANALYSIS OF CONGOPHILIC URINE AND ITS DETERGENT RESISTANT FRACTION IN PATIENTS WITH AMYLOID AND NON-AMYLOID NEPHROPATHIES

Abstract Background and Aims Being a well-known intrinsic property of amyloid, сongophilia was recently demonstrated in urine of patients with proteinuria of different etiology including renal amyloidosis (RA) and non-amyloid nephropathies (NANP) [1]. Urine proteins (UPs) responsible for congophilia in RA and NANP are supposed to have another property of amyloid such as resistance to ionic detergents and present in urine as detergent-resistant aggregates (DRA). In the pilot study we performed mass-spectrometry (MS) analysis of congophilic urine samples and its detergent-resistant fraction in patients with RA and NANP to investigate UPs and their specificity to the particular kidney disease. Method We collected first morning void urine samples from patients with RA (n = 4) and NANP (n = 4). Urine congophilia was assessed by Congo red Dot test as described previously [1]. To analyze bulk urine (BU) proteins, 30 μl of supernatant was precipitated with 80% acetone and boiled in 2% sodium dodecyl sulfate (SDS) for 30 minutes. Then 5 μg of UPs was separated in 10% polyacrylamide gel electrophoresis (PAGE) followed by Coomassie blue staining. The ultracentrifugation of 0.5-3 ml of urine at 300,000x g for 16h following by the treatment of precipitate with 3% sarcosyl in phosphate-buffered saline (PBS) for 10 min with subsequent washing of resistant aggregates in PBS were applied to obtain DRA. After boiling in SDS 8 μl of the sample was separated in 10% PAGE. UPs concentration in the DRA was estimated by densitometry regarding to 2 μg of bovine serum albumin. Then 6 μg of UPs was digested with trypsin, followed by purification on silicate (CDS Empore™ C18 Extraction Disks). Prepared samples of BU and DRA were analyzed by electrospray ionization tandem MS. We used MsFragger software to obtain lists of UPs for each sample. Most representative UPs in the sample were selected by the unique spectral count (USC). We considered the protein as having diagnosis-specific potential (DSP) if it was present in every sample of the particular disease group, i.e. AA, AL, NANP in BU or DRA, and was absent in any sample of another disease group. Results The patients had following characteristics: age 51±13 years, 3 male/ 5 female, eGFR = 45 (19; 95) ml/min/1.73 m2; 24 h proteinuria = 6.5 (4.5; 7.9) g. In PAGE analysis, BU proteins appeared to be similar in all 8 samples with 2 major bends in 70 kDa and 50 kDa regions, corresponding to albumin and immunoglobulin (Ig) heavy chains, respectively (Fig. 1A). The amount of protein in DRA was small and comprised 1.02 (0.71; 1.61) % of the total protein in the sample (4.7 (2.3; 5,1) g/l). Compared with BU PAGE analysis of DRA proteins revealed other bends with trace albumin bend, predominance of 45 kDA region bend and more apparent 30 kDa bend (Ig light chains) in the majority of patients (Fig. 1B). Results of MS analysis are shown on the Figure 2. There were more DSP revealed in DRA vs BU: 14 vs 5, 46 vs 2 and 4 vs 2 UPs in samples of AL, AA and NANP, respectively. When compare by a particular disease group, there were no DSP found either in BU or DRA in RA samples. One protein (aminopeptidase N) and 3 proteins (isoform 3 of unconventional myosin-LC, protein S100-A8, elongation factor 1-α 1) were detected as DSP in BU and DRA in AL, respectively. Alpha-1-acid glycoprotein 1 was only DSP for AA in DRA as well as serum paraoxonase 1 for NANP in BU. Venn-diagrams of shared and divergent UPs are present on the Figures 2D-G. Conclusion Although DRA represented a small portion of UPs, its composition significantly differed from BU and could contain more specific disease markers that makes urine detergent-resistant fraction promising for the future research. Understanding the role of DRA proteins in the pathogenesis of amyloid and non-amyloid renal disease and their diagnostic utility requires further studies.

Urine proteomics by mass spectrometry identifies proteins involved in key pathogenic pathways in patients with juvenile dermatomyositis.

To identify and validate biomarkers in juvenile dermatomyositis (JDM) patients using a multiplexing tandem mass tag urine proteome profiling approach. First morning void urine samples were collected from JDM patients (n = 20) and healthy control subjects (n = 21) and processed for analysis using a standardized Liquid Chromatography-Tandem Mass Spectrometry approach. Biomarkers with significantly altered levels were correlated with clinical measures of myositis disease activity and damage. A subset of candidate biomarkers was validated using commercially available ELISA kits. In total, 2348 proteins were detected in the samples, with 275 proteins quantified across all samples. Among the differentially altered proteins, Cathepsin D and Galectin-3 binding protein were significantly increased in the urine of JDM patients (adj p< 0.05), supporting previous findings in myositis patients. These two candidate biomarkers were confirmed with ELISAs. Cathepsin D positively correlated with Myositis Damage Index (r = 0.57, p< 0.05) and negatively correlated with the Childhood Myositis Assessment Scale (r=-0.54, p< 0.05). We also identified novel JDM candidate biomarkers involved with key features of myositis, including extracellular matrix remodeling proteins. This study confirmed the presence of several proteins in the urine of JDM patients that were previously found to be elevated in the blood of myositis patients and identified novel candidate biomarkers that require validation. These results support the use of urine as a source for biomarker development in JDM.

PS-C30-1: URINARY ANGIOTENSINOGEN-MELATONIN RATIO IN GESTATIONAL DIABETES AND PREECLAMPSIA

Objective: A large research portfolio indicates that an activated renal renin-angiotensin system or a deficit on melatonin is associated with several cardiovascular pathologies. In this observational clinical study, we hypothesized that alterations in urinary melatonin or angiotensinogen levels may be altered in two common conditions, preeclampsia and gestational diabetes. Our primary objective was to assess melatonin and angiotensinogen as novel disease biomarkers detectable and quantifiable in the urine of pregnant women with or without pregnancy complications. Design and Methods: This was a concurrent cohort study of pregnant women with selected obstetric pathologies (gestational diabetes, preeclampsia, hypertension and obesity with hypertension). A group of healthy controls was also included. Urinary 6-sulfatoxymelatonin and angiotensinogen were measured by sensitive and specific ELISAs in first morning void urine samples. The patients were included in the cohort consecutively, and the diagnosis was blinded at the level of urine collection. Urinary 6-sulfatoxymelatonin and angiotensinogen levels were investigated in the patients included in the cohort. Results: Urinary levels of angiotensinogen were significantly higher in the gestational diabetes [angiotensinogen/creatinine ratio median (25th, 75th): 0.11 (0.07, 0.18)] and preeclampsia [0.08 (0.06, 0.18)] groups than in those with healthy pregnancy [0.05(0.04, 0.06]; 6-sulfatoxymelatonin levels were significantly lower in the gestational diabetes [ug/h: median (25th, 75th): 0.12(0.08, 0.17)] and preeclampsia [0.12 (0.09, 0.15)] groups than in those with healthy pregnancy [0.20 (0.15, 0.27]. Neither morning void protein/creatinine ratio nor 24-h urine protein estimate were significantly different between the study groups. Conclusion: These results suggest that urinary angiotensinogen levels may indicate an intrarenal RAS activation while melatonin production appears to be defective in gestational diabetes or hypertension. An angiotensinogen/melatonin ratio is suggested as an early biomarker for identification of gestational diabetes or hypertension. This report provides a basis for the potential use of melatonin for the treatment of preeclampsia. A prospective study in a larger number of patients to determine the operative characteristics of these markers as potential diagnostic tests is justified.

Autoimmune gene expression profiling of fingerstick whole blood in Chronic Fatigue Syndrome

BackgroundMyalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is a debilitating condition that can lead to severe impairment of physical, psychological, cognitive, social, and occupational functions. The cause of ME/CFS remains incompletely understood. There is no clinical diagnostic test for ME/CFS. Although many therapies have been used off-label to manage symptoms of ME/CFS, there are limited, if any, specific therapies or cure for ME/CFS. In this study, we investigated the expression of genes specific to key immune functions, and viral infection status in ME/CFS patients with an aim of identifying biomarkers for characterization and/or treatment of the disease.MethodsIn 2021, one-hundred and sixty-six (166) patients diagnosed with ME/CFS and 83 healthy controls in the US participated in this study via a social media-based application (app). The patients and heathy volunteers consented to the study and provided self-collected finger-stick blood and first morning void urine samples from home. RNA from the fingerstick blood was tested using DxTerity’s 51-gene autoimmune RNA expression panel (AIP). In addition, DNA from the same fingerstick blood sample was extracted to detect viral load of 4 known ME/CFS associated viruses (HHV6, HHV7, CMV and EBV) using a real-time PCR method.ResultsAmong the 166 ME/CFS participants in the study, approximately half (49%) of the ME/CFS patients reported being house-bound or bedridden due to severe symptoms of the disease. From the AIP testing, ME/CFS patients with severe, bedridden conditions displayed significant increases in gene expression of IKZF2, IKZF3, HSPA8, BACH2, ABCE1 and CD3D, as compared to patients with mild to moderate disease conditions. These six aforementioned genes were further upregulated in the 22 bedridden participants who suffer not only from ME/CFS but also from other autoimmune diseases. These genes are involved in T cell, B cell and autoimmunity functions. Furthermore, IKZF3 (Aiolos) and IKZF2 (Helios), and BACH2 have been implicated in other autoimmune diseases such as systemic lupus erythematosus (SLE) and Rheumatoid Arthritis (RA). Among the 240 participants tested with the viral assays, 9 samples showed positive results (including 1 EBV positive and 8 HHV6 positives).ConclusionsOur study indicates that gene expression biomarkers may be used in identifying or differentiating subsets of ME/CFS patients having different levels of disease severity. These gene targets may also represent opportunities for new therapeutic modalities for the treatment of ME/CFS. The use of social media engaged patient recruitment and at-home sample collection represents a novel approach for conducting clinical research which saves cost, time and eliminates travel for office visits.

The dark side of current analytic methods for Bence Jones Proteinuria.

Bence Jones proteinuria (BJP) refers to monoclonal free immunoglobulin light chains detected in urine, deriving from the clonal expansion of plasma cells in the bone marrow in patients with plasma cell dyscrasias, associated with monoclonal gammopathies of uncertain origin. This review summarizes routinely diagnostic procedures to assess BJP highlighting critical steps of pre-analytical, analytical, and post-analytical phases. The best option for BJP detection is the first morning void urine sample and immunofixation electrophoresis detection technique (IFE) the recommended method, with the employment of specific polyvalent antisera. Other qualitative tests for a quick evaluation of BJP are currently available. Densitometric analysis performed on the 24-hour urine is the recommended method to quantify BJP. To overcome the 24-hour collection, it is possible to use morning urine sample and correlate the assessed value of BJP to creatininuria. In addition to the traditional ones, we here reviewed screening methods currently used to avoid false negatives and reduce the time around test (TAT), together with immunochemical quantification methods for increased sensitivity, after checking BJP by IFE. Mass spectrometry emerges as a new challenge in the determination of BJP. The employment of different based-assays methods may be useful for diagnostic purposes to improve the accuracy of BJP monitoring in monoclonal gammopathies.

Long-term stability of several endocrine disruptors in the first morning urine samples and their associations with lifestyle characteristics

Parabens, triclosan (TCS), bisphenols, benzophenones, and phthalates are typical endocrine disruptors (EDs) with short half-lives in the human body. The concentration levels of those EDs in a spot urine sample are frequently used in exposure assessment studies, and the reproducibility of urinary levels of these nonpersistent EDs should be considered. In the present study, we consecutively collected 45-day first morning void (FMV) urine samples, as well as daily questionnaires, in six recruited participants and measured the urinary concentrations of six parabens, TCS, nine bisphenols, five benzophenones, and ten phthalate metabolites by using high-performance liquid chromatography-tandem mass spectrometry. MeP, EtP, PrP, TCS, BPA, BPS, BPF, and most phthalate metabolites were frequently detected (over 62 % of samples). The intraclass correlation coefficients (ICCs) for ED concentrations in FMV urine samples ranged from fair to excellent for MeP (0.683), EtP (0.702), BPA (0.505), BPS (0.908), BPF (0.887), BP-3 (0.712), mMP (0.661), mEP (0.523), mBP (0.500), miBP (0.724), mBzP (0.961) and all metabolites of DEHP (0.867–0.957), whereas they were low for PrP (0.321) and TCS (0.306). After creatinine adjustment, the values of ICCs for most target EDs were increased with mild to significant improvement. The stability of ED concentrations was affected by daily diet (MeP, TCS, BPA, mMP, miBP, mBP and mBzP), food containers (PrP and mECPP), use of personal care products (HMWP metabolites), pharmaceuticals (EtP) and recorded activities (BPS, mEHP, mBzP, mEHHP and mEOHP), as confirmed by a general linear mixed model. Furthermore, extending the FMV sampling period improved the probability of acceptable reproducibility (ICCs > 0.40) of MeP, EtP, BP-3 and mEP concentrations. For BPS, BPF and HMWP metabolite concentrations showed high probabilities (>80 %) of acceptable reproducibility in the last three days, and the increasing sample size slowly improved the ability to discriminate the subjects. The results were exactly the opposite for BPA concentrations.

FC052: Atrasentan for the Treatment of IGA Nephropathy: Interim Results from the Affinity Study

Abstract BACKGROUND AND AIMS IgA nephropathy (IgAN) is the most common primary glomerulonephritis in the developed world. Up to 40% of patients with IgAN are at risk of progressing to end-stage kidney disease (ESKD), with proteinuria being a strong predictor of disease progression. Treatments that reduce proteinuria in IgAN are accompanied by eGFR preservation and improved kidney outcomes.[1] Endothelin A (ETA) receptor activation is a key driver of proteinuria, inflammation and fibrosis in patients with glomerular diseases.[2] Therefore, ETA receptor blockade has potential to be of therapeutic benefit for patients with proteinuric glomerular diseases, including IgAN. Atrasentan, a potent and selective ETA receptor antagonist that has demonstrated clinically significant reductions in proteinuria and risk of ESKD in a study of over 5300 patients with diabetic kidney disease (DKD), represents a potential therapy to reduce proteinuria and preserve kidney function in patients with IgAN and other glomerular diseases.[3] AFFINITY is a global, phase 2, open-label basket study to evaluate the efficacy and safety of atrasentan in patients with proteinuric glomerular diseases due to IgAN, Alport syndrome, focal segmental glomerulosclerosis and DKD. Here we present interim results from the first 17 patients enrolled in the IgAN cohort of the AFFINITY study, through week 12 of treatment. METHOD Approximately 20 patients will be enrolled in the IgAN cohort. They must have biopsy proven IgAN, be receiving a maximally tolerated and stable dose of renin angiotensin system inhibitor and have a urine protein creatinine ratio [UPCR] between 0.5 and &amp;lt;1.0 g/g from a first morning void urine sample. Patients are treated orally with 0.75 mg atrasentan daily. The primary endpoint is the change in 24-h UPCR from baseline to Week 12. Key exploratory endpoints include changes in eGFR from baseline to Week 56. RESULTS A total of 17 patients have enrolled in the IgAN cohort as of 4 January 2022. A total of 12 and 8 patients have completed visits through Week 6 and Week 12, respectively. The median age is 47 years and 41% are women. The geometric mean (GM) baseline proteinuria is 1.2 g/day, and median eGFR is 41 mL/min/1.73 m2 (Table 1). The 8 patients on treatment through Week 12 had a GM % reduction from baseline in 24-h UPCR of 43.6% [95% confidence interval (95% CI) 29.0–55.2] (Figure 1). Pharmacokinetic data are currently available for nine patients and showed a mean trough plasma atrasentan concentration in the targeted therapeutic range. Adverse events (AE) were observed in nne patients (53%), all mild or moderate in severity, most of which have resolved. One patient experienced an unrelated serious adverse event of traffic accident without long-term injuries. All patients remain on treatment with study drug except for one patient who discontinued drug due to an unrelated AE at week 13. CONCLUSION Treatment of patients with IgAN with atrasentan in addition to standard of care provided a &amp;gt;43% GM reduction in proteinuria after 12 weeks and was well tolerated, strongly supporting a key role of the endothelin pathway in the pathogenesis of IgAN. The ongoing phase 3 ALIGN study for patients with IgAN and proteinuria ≥1g/day will provide further assessment of the proteinuria lowering effects of atrasentan in this high-risk patient population.

Variability in urinary concentrations of primary aromatic amines

Despite their known carcinogenic potential, primary aromatic amines (AAs) continue to be used in various consumer products. Human exposure to AAs is a subject of current concern. Although urinary measurements are used in the assessment of exposure, little is known about within- and between-individual temporal variability in urinary concentrations of AAs. In this study, we determined the concentrations of 30 AAs, nicotine and cotinine in 213 first morning void (FMV) urine samples collected longitudinally for over a five-week period from 15 participants residing in the Albany area of New York State, USA. Eight AAs, namely, aniline, 2-naphthylamine (2-NA), p-cresidine (p-CD), p-toluidine (p-TD), o/m-toluidine (o/m-TD), 4-chloroaniline (4-CA), 4,4′-methylenedi-o-toluidine (4,4’-MDA), and 2,6-dimethylaniline (2,6-DMA) were found in urine at a detection frequency (DF) in the range of 68–100%. Aniline and 2,6-DMA were the predominant compounds found at median concentrations of 6.0 and 3.81 ng/mL, respectively. Intraclass correlation coefficients (ICCs) of all urinary AA concentrations, except for 4-CA, showed moderate to poor predictability (ICC values ranged 0.248–0.697). Gender and ethnicity-related variations in ∑8AA concentrations were significant. Spearman's correlations among AA concentrations suggested that the sources of exposure were not related to tobacco smoke. No significant correlations existed between AAs concentrations and oxidative stress biomarkers (OSBs). The estimated daily intakes of AAs calculated based on urinary concentrations were several orders of magnitude below the tolerable daily intakes.

Urinary Angiotensinogen-Melatonin Ratio in Gestational Diabetes and Preeclampsia.

Background: A large research portfolio indicates that an activated renal renin-angiotensin system or a deficit on melatonin is associated with several cardiovascular pathologies. In this observational clinical study, we hypothesized that alterations in urinary melatonin or angiotensinogen levels may be altered in two common conditions, preeclampsia and gestational diabetes. Our study’s primary objective was to assess melatonin and angiotensinogen as novel disease biomarkers detectable and quantifiable in the urine of pregnant women with or without pregnancy complications. Methods: This was a concurrent cohort study of pregnant women with selected obstetric pathologies (gestational diabetes, preeclampsia, hypertension and obesity with hypertension). A group of healthy controls was also included. Urinary 6-sulfatoxymelatonin and angiotensinogen were measured by sensitive and specific ELISAs in first morning void urine samples. The patients were included in the cohort consecutively, and the diagnosis was blinded at the level of urine collection. Urinary 6-sulfatoxymelatonin and angiotensinogen levels were investigated in the patients included in the cohort. Results: Urinary levels of angiotensinogen were significantly higher in the gestational diabetes [angiotensinogen/creatinine ratio median (25th, 75th): 0.11 (0.07, 0.18)] and preeclampsia [0.08 (0.06, 0.18)] groups than in those with healthy pregnancy [0.05(0.04, 0.06]; 6-sulfatoxymelatonin levels were significantly lower in the gestational diabetes [ug/h: median (25th, 75th): 0.12(0.08, 0.17)] and preeclampsia [0.12 (0.09, 0.15)] groups than in those with healthy pregnancy [0.20 (0.15, 0.27]. Neither morning void protein/creatinine ratio nor 24-h urine protein estimate were significantly different between the study groups. Conclusion: These results suggest that urinary angiotensinogen levels may indicate an intrarenal RAS activation while melatonin production appears to be defective in gestational diabetes or hypertension. An angiotensinogen/melatonin ratio is suggested as an early biomarker for identification of gestational diabetes or hypertension. This report provides a basis for the potential use of melatonin for the treatment of preeclampsia. A prospective study in a larger number of patients to determine the operative characteristics of these markers as potential diagnostic tests is justified.

Nonylphenol exposure in 7-year-old Japanese children between 2012 and 2017- Estimation of daily intakes based on novel urinary metabolites.

Nonylphenol (NP) has been under scrutiny for decades due to its endocrine-disrupting properties and its ubiquity in the environment. Despite its widespread occurrence, robust and reliable exposure data are rare. In this study, we used human biomonitoring (HBM) measuring the novel urinary alkyl-chain-oxidized biomarkers OH-NP and oxo-NP to determine NP exposure in 7-year-old Japanese children. The new biomarkers are advantageous over measuring unchanged NP because they are not prone to external contamination. We analyzed 180 first morning void urine samples collected between 2012 and 2017. OH-NP and oxo-NP were detected in 100% and 66% of samples at median concentrations of 2.69 and 0.36µg/L, respectively. 10-fold concentration differences between OH-NP and oxo-NP are in line with recent findings on human NP metabolism. Based on OH-NP we back-calculated median and maximum NP daily intakes (DI) of 0.14 and 0.95µg/(kg bw*d). These DIs are rather close to but still below the current provisional tolerable daily intake of 5µg/(kg bw*d) by the Danish Environmental Protection Agency. Between 2012 and 2017 the DIs decreased by an average of 4.7% per year. We observed no seasonal changes or gender differences and questionnaire data on food consumption, housing characteristics or pesticide use showed no clear associations with NP exposure. Urinary OH-NP was weakly associated with the oxidative stress (lipid peroxidation) biomarkers N-ε-hexanoyl-lysine (HEL) and trans-4-hydroxy-2-nonenal (HNE) (Spearman ρ=0.30 and 0.22, respectively), but not with 8-hydroxy-2'-deoxyguanosine (8-OHdG). Further research is needed to identify and understand the major sources of NP exposure and to investigate a potential role in oxidative stress. This study is the first to investigate NP exposure in Japanese children based on robust and sensitive HBM data. It is a first step to fill the long-standing gap in quantitative human NP exposure monitoring and risk assessment.

Contribution of household drinking water intake to arsenic and lead exposure among Uruguayan schoolchildren

BackgroundFood and water are common exposure sources of arsenic and lead among children. Whereas dietary sources of these toxicants are fairly well-studied, the contribution of drinking water to toxicant exposures is not well characterized in many populations, particularly in the Global South. ObjectiveTo assess the extent to which consumption of household drinking water contributes to arsenic and lead exposure among Uruguayan schoolchildren with low-level exposure. MethodsChildren, aged 5–8 years, were enrolled into the Salud Ambiental Montevideo study during 2009–2013 from schools in Montevideo, Uruguay. Participants reported water intake as part of two 24-h dietary recalls. Concentrations of arsenic were measured in first morning void urine samples, and adjusted for urinary specific gravity. Lead concentrations were measured in venous blood samples. Drinking water samples were collected from participants’ homes and toxicant concentrations measured. Data analyses involved a triangulation approach. First, multivariable linear regressions estimated the associations between toxicant exposure through drinking water, calculated for each child as the product of water intake and water toxicant concentration, and the respective toxicant biomarker concentrations among children with complete data on all variables (Sample A; n = 40). Second, regressions were repeated for participants with complete data on all variables except water intakes (Sample B; n = 195), after water intakes were imputed. Finally, models were constructed for participants of Sample B (n = 195) based on drinking water intakes assumed to be fixed at 25th, 50th, 75th percentile intakes of participants in sample A. ResultsToxicant exposure via drinking water intake was low. The triangulation approach revealed no associations between toxicant exposure through household water intake and the respective toxicant biomarker concentrations. ConclusionStudies with larger samples and repeated measures are needed to confirm these findings. Nevertheless, it appears that at low water toxicant concentrations, typical water consumption is not a major contributor to children's exposure.

Diurnal variability in urinary volatile organic compound metabolites and its association with oxidative stress biomarkers

Volatile organic compounds (VOCs) are ubiquitous environmental pollutants that are associated with birth defects, leukemia, neurocognitive deficits, reproductive impairment and cancer in humans exposed to these compounds. Exposure to VOCs can be assessed by measuring their metabolites in urine. Little is known, however, about the temporal variability in urinary VOC metabolite (VOCM) concentrations within- and between-individuals. In this study, we determined the variability in the concentrations of 38 VOCMs in urine samples collected from 19 healthy individuals across a period of 44 days. We also measured seven biomarkers of oxidative stress (lipid, protein and DNA damage) in urine to assess the relationship of VOC exposure to oxidative stress. Seventeen VOCMs had detection frequencies (DFs) of >60% in urine, and we limited further data analysis to those compounds. The creatinine-adjusted geometric mean concentrations of VOCMs ranged from 2.70 μg/g to 327 μg/g in spot and 2.60 μg/g to 551 μg/g in first morning void (FMV) urine samples. Calculation of the intra-class correlation coefficients (ICCs) for 17 VOCM concentrations to assess their predictability and repeatability in urinary measurements showed ranges of 0.080–0.425 in spot and 0.050–0.749 in FMV urine samples, revealing notable within-individual variability. Our results suggest that taking only single measurements of VOCM concentrations in urine in epidemiological investigations may lead to exposure misclassification. In addition, VOCM concentrations were significantly and positively correlated with oxidative stress biomarkers. This study thus provides important information for formulating sampling strategies in the biomonitoring of VOC exposure in human populations.

Relationship between physical activity, objective sleep parameters, and circadian rhythm in patients with head and neck cancer receiving chemoradiotherapy: A longitudinal study.

ObjectivesThis study was developed to assess the relationship between physical activity, sleep and circadian rhythm using accelerometer and urine melatonin levels in patients with head and neck cancer (HNC). Also, this study evaluated the changes in physical activity, sleep, and circadian rhythm during the seven‐week course of chemoradiotherapy.MethodsThis longitudinal study recruited 27 participants diagnosed with HNC who were planning to undergo chemoradiotherapy. Accelerometers worn for 3 days during the 1st, 3rd, and 7th weeks of chemoradiotherapy were used to assess physical activity levels (step count and metabolic equivalents [METs]) and sleep quality (total sleep time [TST], sleep onset latency [SOL], and sleep efficiency [SE]). Urine melatonin analysis was conducted using the morning void urine sample on 1st, 3rd, and 7th weeks. The change in variables during the seven weeks and the correlation between them were analyzed.ResultsDuring the seven weeks, trends of reduction in variables of physical activity, sleep and circadian rhythm were observed with significant decrease in step count, TST and melatonin levels. SE was found to have strong negative correlation with physical activity. TST was found to have moderate correlation with SE and step count. The variables of physical activity also showed moderate correlation among them.ConclusionThis study concludes that higher physical activity is associated with poor SE due to increased night‐time activity. There was a significant reduction in physical activity and sleep observed during seven weeks with moderate association between them. The significant circadian rhythm deregulation however showed poor association with the other variables.Level of Evidence: 2b

Prevalence of Methicillin Resistant Staphylococcus aureus Bacteriuria among Pregnant Women Attending Secondary Health Hospitals in Ilorin, Nigeria

Background: Urinary tract infection is one of the most frequently acquired infections in both community and hospitals and is common among the adolescents and the old genders.&#x0D; Aim: To determine the prevalence of methicillin resistant Staphylococcus aureus bacteriuria among pregnant women attending secondary health hospitals in Ilorin, Nigeria&#x0D; Study Design: An experimental study which involve a random selection of consented pregnant women.&#x0D; Place and Duration of Study: Department of Biosciences and Biotechnology Kwara State University Malete between January 2018 and June 2019.&#x0D; Methodology: In this study, a total of 856 pregnant women mid stream clean catch early morning voided urine samples for two consecutive days (383 of the samples were collected from Sobi Specialist Hospital, 278 from Adewole Cottage Hospital and 195 collected from Ajikobi Cottage Hospital) were randomly screened for the presence of Staphylococcus aureus bacteriuria using standard microbiological procedures such as growth on mannitol salt agar, Gram reaction, catalase and coagulase tests. The Kirby–Bauer disk diffusion method was used to determine the antibiotic sensitivity profile of S. aureus isolated using oxoid antibiotic discs.&#x0D; Results: Out of 856 samples screened 56 samples (6.5%) showed significant Staphylococcus aureus bacteriuria, 16- 25 years has a prevalence rate of 5.6%, 26- 35 years (5.8%) while 35-45 years have the prevalence rate of 10.9%. A total of 7 (12.5%) methicillin resistant Staphylococcus aureus were isolated. Antibiotic sensitivity profile shows that 26.8% were resistance to gentamicin, 44.6% to tetracycline, 19.6% to chloramphenicol, 33.9 % to erythromycin, 67.9% to amoxicillin, 32% to augmentin, 12.6% to ceftriaxone, 5.3% to ciprofloxacin and 100% susceptibility to both nitrofurantoin and vancomycin.&#x0D; Conclusion: The study shows the high prevalence of MRSA and high susceptibility of nitrofurantoin and vancomycin to all the MRSA isolated.

The Use of Morning Urinary Gonadotropins and Sex Hormones in the Management of Early Puberty in Chinese Girls.

ContextAlthough gonadotropin-releasing hormone stimulation test (GnRHST) is the gold standard in diagnosing central precocious puberty (CPP), it is invasive, expensive, and time-consuming, requiring multiple blood samples to measure gonadotropin levels.ObjectiveWe evaluated whether urinary hormones could be potential biomarkers for prepuberty or postpuberty, aiming to simplify the current diagnosis and prognosis procedure.MethodsWe performed a cross-sectional study of a total of 355 girls with CPP in National Clinical Research Center for Child Health in China, including 258 girls with positive and 97 girls with negative results from GnRHST. Twenty patients received GnRH analogue (GnRHa) treatment and completed a 6-month follow up. We measured luteinizing hormone (LH), follicle-stimulating hormone (FSH), estradiol, prolactin, progesterone, testosterone, and human chorionic gonadotropin in the first morning voided urine samples.ResultsTheir urinary LH levels and the ratios of LH to FSH increased significantly with the advancement in Tanner stages. uLH levels were positively associated with basal and peak LH levels in the serum after GnRH stimulation. A cutoff value of 1.74 IU/L for uLH reached a sensitivity of 69.4% and a specificity of 75.3% in predicting a positive GnRHST result. For the combined threshold (uLH ≥ 1.74 + uLH-to-uFSH ratio > 0.4), the specificity reached 86.6%. After 3 months of GnRHa therapy, the uLH and uFSH levels decreased accordingly.ConclusionuLH could be a reliable biomarker for initial CPP diagnosis and screening; uLH could also be an effective marker for evaluating the efficacy of clinical treatment.

Acute Changes in Thyroid Hormone Levels among Thai Pesticide Sprayers.

The objective of this study was to investigate the relationship of acute pesticide exposures and acute changes in thyroid hormones among Thai farmers. We recruited 78 farmers, who were scheduled to spray insecticides (chlorpyrifos and/or cypermethrin) or herbicides (paraquat and/or glyphosate). On the day before spraying, farmers collected their first morning void urine and went for blood collection. On the spray day, urine samples were collected at end of the spraying event and they were interviewed with questionnaires. The next morning, the first morning void urine and blood samples were collected. Blood samples were analyzed for thyroid hormones. Urine samples were analyzed for the metabolites of the pesticide sprayed. The results showed that the thyroid hormones, free triiodothyronine (FT3) and total triiodothyronine (T3) were significantly reduced as urinary chlorpyrifos metabolite increased the day after spraying. Total thyroxine (T4) significantly increased as cypermethrin metabolites increased the day after spraying. T4 significantly increased as urinary glyphosate levels increased; however, FT3 and T3 decreased significantly as urinary paraquat levels increased the day after spraying. These findings suggest that acute exposures to the pesticides chlorpyrifos, cypermethrin, paraquat and glyphosate can produce acute effects on the hypothalamic–pituitary–thyroid (HPT) axis, acutely altering thyroid hormone levels.