Serum Zinc Levels Research Articles

Serum zinc concentration as a potential predictor of presarcopenia in patients with chronic liver disease: a preliminary study.

Presarcopenia is a common complication of chronic liver disease. However, the relationship between serum zinc concentration and presarcopenia in patients with chronic liver disease remains unclear. Herein, we examined whether serum zinc concentration could predict presarcopenia in patients with chronic liver disease. Between October 2015 and December 2019, 278 patients with chronic liver disease (median age, 68 years; women/men, 133/145; hepatitis B virus/hepatitis C virus/negative hepatitis B surface antigen and negative anti-hepatitis C virus antibody, 55/124/99) who underwent abdominal computed tomography (CT) and simultaneous measurement of serum zinc concentration were included. Zinc deficiency and subclinical zinc deficiency were classified using serum zinc concentration cutoff values of <60 and <80 μg/dL [based on the Japanese Society of Clinical Nutrition (JSCN) guidelines], respectively. Additionally, presarcopenia was evaluated based on the skeletal muscle mass as per the Japan Society of Hepatology (JSH)'s sarcopenia criteria. Univariate analysis revealed that the following factors were significantly associated with the presence of presarcopenia in patients with chronic liver disease: age (P<0.001), male sex (P<0.001), body mass index (BMI) (P<0.001), serum zinc concentration (P=0.005), fibrosis-4 index (P<0.001), and serum albumin concentration (P=0.03). Additionally, the median L3 skeletal muscle indices were as follows: men, non-presarcopenia group/presarcopenia group, 47.56/37.91 cm2/m2 (P<0.001); women, non-presarcopenia group/presarcopenia group, 41.64/32.88 cm2/m2 (P<0.001). Multivariate analysis using logistic regression analysis revealed that male sex [odds ratio (OR), 0.194; 95% confidence interval (CI): 0.089-0.419; P<0.001], BMI (OR, 0.666; 95% CI: 0.582-0.761; P<0.001), and serum zinc concentration <60 μg/dL (OR, 5.930; 95% CI: 1.480-23.80; P=0.01) were factors associated with presarcopenia. The OR for serum zinc concentration between 60 and 80 μg/dL was 1.910 (95% CI: 0.824-4.420; P=0.13). Low serum zinc levels may be an independent predictor of presarcopenia in patients with chronic liver disease.

The Relationship of Serum Zinc Level in Patients with Pneumonia and Its Effect on Their Outcome

The Relationship of Serum Zinc Level in Patients with Pneumonia and Its Effect on Their Outcome

Serum Levels of Copper and Zinc and Survival in Breast Cancer Patients.

There is emerging interest in the relationship between several serum micronutrients and the prognosis of patients with breast cancer. The relationship between serum zinc and copper levels and breast cancer prognosis is unclear. In our study, we included 583 patients with breast cancer diagnosed between 2008 and 2015 in the region of Szczecin, Poland. In a blood sample obtained before treatment, serum zinc and copper levels were quantified by mass spectroscopy. Each patient was assigned to one of four categories (quartiles) based on the distribution of the elements in the entire cohort. Patients were followed from diagnosis to death over a mean of 10.0 years. The 10-year overall survival was 58.3% for women in the highest and 82.1% for those in the lowest quartile of serum copper/zinc ratio (p < 0.001). The multivariate hazard ratio (HR) for breast cancer death was 2.07 (95% CI 1.17-3.63; p = 0.01) for patients in the highest quartile of serum copper/zinc ratio compared to those in the lowest. There is evidence that the serum zinc level and copper/zinc ratio provide an independent predictive value for overall survival and breast cancer-specific survival after breast cancer diagnosis.

Enhancing metabolic health and exercise performance with zinc-enriched postbiotic supplementation: a nutritional intervention study

In recent years, the focus on improving well-being through natural solutions, such as dietary adjustments to improve the composition and functionality of the microbiota, has gained prominence. This study explored the effects of a zinc-enriched postbiotic of whole-cell yeast strains (Saccharomyces boulardii ABB S3, Kluyveromyces marxianus ABB S8, and Saccharomyces cerevisiae ABB S6) on metabolic health and gastrointestinal well-being in resistance-training individuals. Over a 30-day period, 18 participants who experienced gastrointestinal discomfort and were not using other dietary supplements underwent evaluation. The intervention aimed to assess changes in serum zinc levels, protein metabolism indicators, and gastrointestinal health, using a repeated measures design for comprehensive data analysis. Results showed a significant increase in serum zinc levels and improvements in protein metabolism markers, alongside reduced gastrointestinal discomfort. These findings underline the efficacy of zinc-enriched postbiotic supplementation in enhancing metabolic health, and suggest that such targeted nutritional interventions can significantly benefit exercise performance and general well-being. The study's outcomes support the potential of incorporating postbiotics into dietary strategies for health maintenance, offering a promising direction for future research in nutritional science and the management of exercise-induced gastrointestinal symptoms.

Evaluation of Vit. D3 and Zn levels in patients with urinary tract infections

Background: Vitamin D, known for its immunoregulatory effects and antimicrobial properties, plays a crucial role in regulating inflammation and chemokine production. Zinc is influential for a healthy immune system and human health, influencing cell differentiation, proliferation, and apoptosis, which impact organism growth. Objective: Determine the serum zinc and vitamin D3 levels in UTI patients and controls to detect the role of vit. D3 and Zn in UTIs, and their levels in recurrent and non-recurrent infections. Materials and Methods: Samples of 60 urinary tract infection patients, distributed between 30 females and 30 males, were collected from Imam Hassan Al-Mujtaba Hospital for the period from December 2022 to April 2023. After collecting venous blood samples from patients and the controls, the serum was separated to measure the concentrations of vitamin D3 and zinc. The concentration of vitamin D3 was measured using the Cobas system, while the concentration of zinc was measured using a Mindray device. Results: UTI patients have lower serum zinc levels than the controls group, with the patient group having 83.0 mg/dL compared to the control group. Vitamin D3 was also low in the patients group compared to controls (10.50, 12.58 respectively). Conclusion: Vitamin D3 and zinc levels can influence UTI development, with patients having lower serum vit. D3 and zinc than the controls group, indicating a potential risk of UTI.

Associations between Zinc Deficiency, Taste Changes, and Salivary Flow Rates following Gastric Bypass and Sleeve Gastrectomy Surgeries.

The prevalence of taste change (hypogeusia) and its association with zinc deficiency is unclear due to differences in methods of assessment. We investigate the prevalence of hypogeusia using mixed methods and link it with changes in zinc levels following mini gastric bypass (MGB) and sleeve gastrectomy (SG). This was a prospective observational study of MGB (N = 18) and SG (N = 25). Hypogeusia was evaluated by using a validated questionnaire and by taste strips procedure along with serum zinc levels and salivary flow rate measurements. The mean age was 40.0 ± 9.7 years; 60.5% were female. By using a questionnaire, MGB patients experienced greater hypogeusia than SG at 3 months (72.0% vs 36.0%; (p=0.03)), but not at 6 months (56.0% vs 45.0%; (p=0.74)), respectively. Using taste strips, at 6 months, more MGB patients experienced hypogeusia compared with SG (44.0% vs 11.0%; p=0.03). Zinc level was reduced following MGB at 6 months (85.6 ± 16.9 μgm/dl vs 67.5 ± 9.2 μgm/dl; (P=0.004)) but was increased at 6 months following SG (76.9 ± 11.4 vs 84.9 ± 21.7 μgm/dl). Reduction in the rate of salivary flow was observed in 66.0% and 72.0% of MGB and SG patients, respectively, at 3 months and in 53.0% and 70.0% at 6 months. Taste change is more prevalent following MGB compared with SG, especially at 6 months postoperation which parallel with changes in zinc levels. More than half of all patients who had undergone bariatric surgery (BS) had low to very low salivary flow rates during the follow-up. This study suggests an association between low zinc levels and reduced salivary flow with hypogeusia following BS.

A Study of Biochemical Markers in Uterine Cancer Diagnosis with Radiotherpay Treatment In Iraq

Background: Uterine cancer is a prevalent gynecological malignancy, with rising incidence rates globally. Early detection and effective treatment are essential for improving patient outcomes. Biochemical markers play a crucial role in diagnosing and monitoring uterine cancer, yet their comprehensive evaluation remains limited. Methods: This study aimed to assess various biochemical markers in the serum of uterine cancer patients compared to healthy individuals. Serum samples from 30 uterine cancer patients and 40 healthy females were analyzed for urea, creatinine, lactate dehydrogenase (LDH) activity, antioxidants (vitamin C and vitamin E), peroxynitrite, and trace elements (calcium and zinc). Results: The study revealed a significant decrease in urea and creatinine levels in serum of uterine cancer patients compared to healthy individuals (p≤0.05). During radiotherapy, blood urea nitrogen (BUN) exceeded the normal range (7-20 mg/dl), averaging 25.44 ± 9.87 mg/dl before treatment initiation, with no significant decrease during therapy. Serum creatinine levels remained within the normal range. Additionally, a significant reduction in serum vitamin C and vitamin E levels was observed in uterine cancer patients compared to healthy individuals (p≤0.05). Moreover, there was a significant increase in peroxynitrite and lactate dehydrogenase (LDH) activity, along with a rise in serum calcium levels, and a significant decrease in serum zinc levels among uterine cancer patients (p≤0.05). Conclusion: The findings highlight the significance of assessing multiple biochemical markers in uterine cancer diagnosis and monitoring. Elevated LDH, peroxynitrite, and calcium levels, along with reduced vitamin C, vitamin E, and zinc levels, may serve as valuable diagnostic markers for uterine cancer.

The association between zinc and prostate cancer development: A systematic review and meta-analysis.

Prostate cancer is affecting males globally, with several complications. Zinc can play roles in cancers. We aimed to clarify the association between zinc levels or intake with prostate cancer development. We searched PubMed, EMBASE, Cochrane Central Register of Controlled Trials (CENTRAL), and Web of Science until May 1, 2023. We included case-controls and cross-sectionals that measured zinc level and/or intake in patients with prostate cancer or cohorts that evaluated the association between zinc and prostate cancer development. Studies that did not have a healthy control group were excluded. Joanna Briggs Institute was used for quality assessment. Publication bias was evaluated using Egger's and Begg's tests and funnel plot. Overall, 52 studies (n = 44 case controls, n = 4 cohorts, and n = 4 cross sectionals) with a total number of 163909 participants were included. Serum (standardized mean difference (SMD): -1.11; 95% confidence interval (CI): -1.67, -0.56), hair (SMD: -1.31; 95% CI: -2.19, -0.44), and prostatic fluid or tissue zinc levels (SMD: -3.70; 95% CI: -4.90, -2.49) were significantly lower in prostate cancer patients. There were no significant differences in nail zinc level and zinc intake between those with prostate cancer and healthy controls. There was no publication bias except for serum and hair zinc levels based on Begg's and Egger's tests, respectively. The mean risk of bias scores were 4.61 in case-controls, eight in cohorts, and seven in cross-sectionals. Overall, high zinc levels might have a protective role in prostate cancer, which can be used as a therapeutic or preventive intervention. Future large-scale studies are needed to confirm the association.

Childhood asthma biomarkers including zinc: An exploratory cross-sectional study.

Childhood bronchial asthma (BA) is a chronic inflammatory respiratory disease. Nutritional conditions, including zinc deficiency, can affect such allergic disorders. To outline the difference in serum zinc levels between asthmatic children and healthy controls. A cross-sectional study was carried out at Children's Hospital, Cairo University, investigating serum zinc levels in children with BA (n = 40) and healthy children (n = 21). Other markers included serum ferritin, iron, hemoglobin (Hb), and immunoglobulin E (IgE) levels. Independent t-tests and Mann-Whinny tests were used for comparisons. The Kruskal-Wallis test was applied to compare serum ferritin and IgE levels with regard to asthma severity. Spearman's rank correlation was performed to explore the relationship between serum ferritin levels and both iron and Hb levels in asthmatic children. Children with BA had higher levels of zinc, yet the difference was not significant (P = 0.115). Serum ferritin and IgE levels were significantly higher in asthmatic children (P = 0.006 and 0.001, respectively), yet their levels did not differ significantly by severity (P = 0.623 and 0.126, respectively). There was a nonsignificant weak correlation between serum ferritin levels and both serum iron and Hb levels. Serum zinc levels do not seem to differ between asthmatic children and healthy children. Serum ferritin levels may be a marker of asthma control. Serum IgE levels are not markers of asthma severity.

Association between preoperative serum zinc level and prognosis in patients with advanced esophageal cancer in the neoadjuvant treatment era

AbstractBackgroundZinc (Zn), an essential trace element, has an adverse influence on the prognosis of several cancers. However, the association between the preoperative serum Zn level and outcomes in patients with advanced esophageal cancer in the current neoadjuvant treatment era remains unclear.MethodsThis study involved 185 patients with esophageal cancer who underwent R0 surgery after neoadjuvant chemotherapy from August 2017 to February 2021. We retrospectively investigated the relationship between the preoperative serum Zn level and the patients' outcomes.ResultsThe patients were divided into a low Zn group (&lt;64 μg/dL) and a high Zn group (≤64 μg/dL) according to the mean preoperative serum Zn level. Low Zn had significantly worse overall survival (OS) (2‐year OS rate: 76.2% vs. 83.3% in low vs. high Zn; p = 0.044). A low Zn in pathological non‐responders (Grade ≤ 1a) was significantly associated with a shorter 2‐year recurrence‐free survival (RFS) rate (39.6% vs. 64.1% in low vs. high Zn; p = 0.032). The multivariate analysis identified low BMI and Zn level among preoperative nutritional status indices as an independent risk factor for worse RFS in non‐responders. Compared with responders, pathological non‐responders comprised significantly more males and a performance status of ≥1, and there was no difference in Zn level according to pathological response.ConclusionA preoperative low Zn level had a negative impact on early recurrence in esophageal cancer patients who underwent neoadjuvant chemotherapy. This suggests the need to administer Zn supplementation to patients with esophageal cancer who have preoperative Zn deficiency.

Serum zinc levels in hemodialysis and peritoneal dialysis patients: A retrospective observational study.

Zinc is vital for cellular functions, but kidney failure increases zinc deficiency risk. We compared zinc levels in hemodialysis (HD) and peritoneal dialysis (PD) patients in Isfahan, Iran. A retrospective study included 150 patients (75 PD and 75 HD). Serum zinc levels were assessed through photometry. Statistical analysis employed Chi-square, independent t-test, and correlation. Serum zinc was below normal in both groups (P < 0.01). HD patients had lower zinc levels (70.85 ± 7.68 mg/dL) compared to PD (75.04 ± 13.55 mg/dL, P = 0.021), remaining significant after adjusting for confounders (P = 0.011). Zinc levels in PD and HD patients are lower than in the general population, with HD patients having lower levels than PD patients.

Zinc deficiency is a potential risk factor for COVID-19 progression to pneumonia requiring oxygen therapy

IntroductionVarious risk factors for developing severe coronavirus disease 2019 (COVID-19) have been reported. However, studies on the nutritional-related risk factors are limited. In this study, we investigated the effects of serum zinc deficiency on the severity of COVID-19. MethodsThe study included a total of 60 COVID-19 patients who were admitted to Tsuyama Chuo Hospital between March 2020 and April 2021. We divided the patients into two categories based on serum levels of zinc (normal and latent zinc deficiency vs. zinc deficiency [<60 μg/dL]) at the time of diagnosis. Severity of COVID-19 was defined as the most exaggerated disease status during admission. The associations between serum zinc deficiency and the severity of COVID-19 were examined using a logistic regression model adjusted for potential confounders. ResultsPatients who required oxygen therapy had a higher prevalence of comorbidities and poorer nutritional status, including zinc deficiency, than those who did not require oxygen therapy. Zinc deficiency was associated with an increased risk of COVID-19 severity, with an adjusted odds ratio of 7.29 (95% confidence interval: 1.70–31.18). This result remained significant in the sensitivity analyses conducted after adjusting for patient background factors. ConclusionsZinc deficiency at the time of COVID-19 diagnosis is an independent risk factor for severe disease. Our findings need to be validated in external studies.

Sex differences in serum trace elements and minerals levels in unmedicated patients with major depressive episode: The role of suicidal ideation

BackgroundWe aimed to examine the influence of gender on serum trace elements and minerals levels in depression, as well as the impact of suicidal ideation (SI) on these gender dimorphisms. MethodsA total of 260 unmedicated patients with a current major depressive episode were enrolled. The Beck Scale for Suicide Ideation was utilized to evaluate SI. The serum levels of copper, zinc, iron, calcium, phosphorus, and magnesium were quantified. ResultsWithin the non-SI (NSI) group, females exhibited higher levels of copper (p = 0.001) and phosphorus (p = 0.008), and lower levels of zinc (p = 0.022) and calcium (p = 0.008) compared to males. Conversely, no discernible gender disparities were observed in the SI group (all p > 0.05). Also, no group differences in these trace elements/minerals were observed between the SI and NSI groups (all p > 0.05). Notably, serum iron levels exhibited a significant group-by-sex interaction effect (p = 0.024). Further analysis revealed that iron levels were higher in the SI group than in the NSI group among females (p = 0.048), but lower in females than in males within the NSI group (p < 0.001). Moreover, a positive association between the fourth quantile of serum iron and SI was detected in females (odds ratio [OR] = 2.88, 95 % confidence interval [CI]: 1.08–8.11). ConclusionsGender effects on serum trace element/mineral levels were different in depressed patients with and without SI. Female patients were susceptible to SI when serum iron was at the upper end of normal.

Investigation of Serum Zinc Level in Non-Diabetic, Pre-Diabetic And Diabetic Patients: A Prospective Cross-Sectional Study

Aim: The aim of the study was to determine the serum zinc level in non-diabetic, pre-diabetic and diabetic patients and reveal the relationship between serum zinc level and glycemic status. &#x0D; &#x0D; Material and Method: The study was a single-center, prospective, cross-sectional study. Fasting blood sugar, glycated hemoglobin, insulin resistance, and serum zinc levels of patients admitted to the internal medicine outpatient clinic were measured. Patients were categorized as non-diabetic, pre-diabetic, and diabetic according to their results, and compared regarding serum zinc levels. &#x0D; &#x0D; Results: Zinc was significantly lower in the diabetes group than in the other groups (p

Post-marketing surveillance of zinc acetate dihydrate for hypozincemia in Japan.

Zinc is an essential microelement, and its deficit causes various diseases and symptoms. In adults, especially in elderly individuals, zinc shortage can cause symptoms such as taste disorder, dermatitis, and susceptibility to infection. In children, zinc deficiency can lead to growth retardation. In 2017, the indication for zinc acetate dihydrate (NOBELZIN®) was expanded from Wilson's disease to include hypozincemia, leading to wider use of zinc acetate dihydrate. At five years after this broadening of use, we conducted a post-marketing study (PMS) to investigate the utilization, safety, and effectiveness of zinc acetate dihydrate. Over 52 weeks, the overall incidence of adverse drug reactions (ADRs) was 9.4% (87/928). The most common ADR was copper deficiency (2.4%), followed by nausea (1.4%). Among 928 patients, 19 (2%) developed serious ADRs. Of the patients with copper deficiency, 92% were >65 years of age, and all had comorbidities at baseline. Physicians evaluated the effectiveness of zinc acetate dihydrate using three categories: "effective", "not effective", and "indeterminate". The overall efficacy rate was 83.0%. The average serum zinc levels were elevated from 50-60 μg/dL to >90 μg/dL within 12 weeks, and were maintained up to 52 weeks after administration. Among the symptomatic sub-categories, the efficacy rate was highest in pressure ulcer (96.2%; 25/26), followed by in stomatitis (87.5%; 42/48), and taste disorder (87.4%; 181/207). Among pediatric patients with developmental symptoms, an efficacy rate of 66% was achieved. In conclusion, zinc acetate dihydrate has been safely used, and has produced beneficial effects on various diseases and symptoms.

ASSESSING IRON DEFICIENCY AS RISK FACTOR FOR FEBRILE SEIZURES IN CHILDREN BETWEEN SIX MONTHS AND FIVE YEARS OF AGE

This case-control study was conducted from September 2023 to December 2023 at the Department of Pediatrics in Pak Emirates Military Hospital, Rawalpindi. The study aimed to determine the relationship between iron deficiency and the development of febrile seizures in children. A total of 150 patients aged between 1 and 6 years, with a history of febrile seizures and currently suffering from pyrexia, were included in the study. Children with a history of recent febrile seizures, structural/organic brain lesions, congenital metabolic/chromosomal anomalies, non-febrile seizures, delayed milestones, or those who were on medications that altered serum iron levels within the past six months were excluded. All participants were assessed for serum iron, ferritin, total iron binding capacity, magnesium, zinc, and calcium at enrollment. Patients were observed for the development of febrile seizures until they were afebrile for twenty-four continuous hours. Of the total sample, the mean age was 3.41 ± 1.51 years, and 83 (55.3%) were male. Patients with a transferrin saturation below 6.5% had a higher adjusted odds ratio (aOR) of 3.96 (CI 95% 1.29 – 12.18, p=0.016) for developing febrile seizures during a pyrexial illness. Similarly, patients with hypozincaemia, defined as a serum zinc level &lt;65 μg/dL, had an aOR of 2.54 (CI 95% 1.13 – 5.67, p=0.023). The study concluded that low serum levels of iron were associated with a higher risk of developing febrile seizures in pyrexial children with a history of the disorder.

Role of zinc in chronic telogen effluvium in serum and hair of patients with alopecia.

To determine the levels of zinc in hair and serum samples of chronic telogen effluvium patients. The case-control study was conducted at the Dow University of Health Sciences, Karachi, from April 2017 to May 2018, and comprised diagnosed cases of chronic telogen effluvium in group A, and healthy controls matched for age and gender in group B. Hair pull test was done, and level of zinc in hair and serum samples was determined using atomic absorption spectrophotometer. Data was analysed using SPSS 21. Of the 100 subjects, 50(50%) were in group A; 28(56%) females ad 22(44%) males with mean age 27.46±4.98 years. There were 50(50%) subejcts in group B; 26(52%) males ad 24(48%) females with mean age 28.34±4.92 years (p>0.05). Significantly low levels of zinc were observed in serum as well as hair samples in group A compared to group B (p<0.05). A positive significant association was observed in the level of zinc in hair with their concentration in the serum of subjects in both the groups (r=0.310, p<0.05). Low levels of zinc in hair and serum were found to be associated with chronic telogen effluvium.

Zinc improves Denosumab and eldecalcitol efficacy for bone mineral density in patients with hypozincemia.

We aimed to investigate the effects of zinc deficiency and zinc medication in osteoporosis patients undergoing denosumab (DMAb). This retrospective study was conducted at a single hospital. The participants were female osteoporosis patients visiting between April 2019 and April 2020. All patients were treated with DMAb and eldecalcitol and recommended zinc-rich food. Based on zinc medication and serum zinc levels at the 12th month of dietary guidance, patients were categorized into the following four groups: hypozincemia with zinc medication, latent zinc deficiency with zinc medication, without zinc medication, and control without zinc medication. Longitudinal serum zinc concentrations, bone mineral density (BMD), and occurrence of fractures were measured. We investigated the factors influencing no response to DMAb and eldecalcitol treatment. Among the 145 patients followed up for 24 months, dietary guidance did not change the serum zinc concentration; however, zinc medication significantly increased these levels. The hypozincemia group did not show a significant BMD increase in the lumbar spine and femoral neck after DMAb and eldecalcitol treatment during dietary guidance; however, zinc medication increased these to the same levels as the other groups. In multivariate analyses, hypozincemia and thyroid disease were identified as the factors affecting no response. While 28.2% of patients with latent zinc deficiency without zinc medication suffered fractures, no fractures occurred in hypozincemia patients with zinc medication. Hypozincemia may reduce the efficacy of DMAb and eldecalcitol in increasing BMD and fracture prevention.

Zinc Transporter ZnT1 mRNA Expression Is Negatively Associated with Leptin Serum Concentrations but Is not Associated with Insulin Resistance or Inflammatory Markers in Visceral Adipose Tissue.

The aim of this study was to evaluate the relationship between biomarkers of chronic inflammation, insulin resistance, and zinc transporter ZnT1 expression in human visceral adipose tissue. Visceral adipose tissue obtained from 47 adults undergoing laparoscopic surgery for cholecystectomy was used to analyze ZnT1 mRNA expression by RT-qPCR. ZnT1 mRNA levels were compared between subjects with normal weight, overweight, and obesity. A significantly lower ZnT1 expression was observed in overweight and obesity compared with normal-weight subjects (p = 0.0016). Moreover, subjects with normal weight had significantly higher serum zinc concentration (97.7 ± 13.1mg/L) than subjects with overweight (87.0 ± 12.8mg/L) and obesity (83.1 ± 6.6mg/L) (p = 0.002). Pearson test showed a positive correlation between serum zinc concentrations and ZnT1 mRNA expression in visceral adipose tissue (r = 0.323; p = 0.031) and a negative correlation with body mass index (r = - 0.358; p = 0.013). A linear regression model was used to analyze the associations between ZnT1 mRNA expression and serum zinc levels, insulin resistance (HOMA2-IR), serum adipokines (leptin and adiponectin), and serum inflammation biomarkers (tumor necrosis factor alpha, interleukin-6, and C-reactive protein). Interestingly, leptin concentrations were negatively associated with ZnT1 mRNA expression (p = 0.012); however, no significant associations were found for the rest of the analyzed variables. Future research is needed to analyze the causality of negative association between ZntT1 expression in visceral adipose tissue and leptin.

Determination of the median lethal dose of zinc gluconate in mice and safety evaluation.

Zinc Gluconate (ZG) is a safe and effective supplement for zinc. However, there is limited research on the optimal dosage for intravenous injection and the safety evaluation of animal models for ZG. This study aims to determine the safe dose range of ZG for intravenous injection in C57BL/6J mice. A Dose titration experiment was conducted to determine the LD50 and 95% confidence interval (95%CI) of ZG in mice. Based on the LD50, four sub-lethal doses (SLD) of ZG were evaluated. Following three injections of each SLD and monitoring for seven days, serum zinc levels were measured, and pathological changes in the liver, kidney, and spleen tissues of mice were determined by histological staining. The dose titration experiment determined the LD50 of ZG in mice to be 39.6mg/kg, with a 95%CI of 31.8-49.3mg/kg. There was a statistically significant difference in the overall serum zinc levels (H = 36.912, P < 0.001) following SLD administration. Pairwise comparisons showed that the serum zinc levels of the 1/2 LD50 and 3/4 LD50 groups were significantly higher than those of the control group (P < 0.001); the serum zinc level of the 3/4 LD50 group was significantly higher than those of the 1/8 LD50 and 1/4 LD50 groups (P < 0.05). There was a positive correlation between the different SLDs of ZG and the serum zinc levels in mice (rs = 0.973, P < 0.001). H&E staining showed no significant histological abnormalities or lesions in the liver, kidney, and spleen tissues of mice in all experimental groups. The appropriate dose range of ZG for intravenous injection in C57BL/6J mice was clarified, providing a reference for future experimental research.