Blood Hormone Levels Research Articles

Взаимосвязи гормонального статуса и показателей красной крови с кардиореспираторной выносливостью у спортсменов и нетренированных юношей

The aim of this paper was to study red blood cell parameters and levels of thyroid-stimulating hormone (TSH), free thyroxine (FT4) and cortisol, as well as their correlations in young male athletes and non-athletes, depending on their cardiorespiratory endurance. Materials and methods. The study involved 18 athletes (weightlifting, kickboxing) with the ranks ranging from First-Class Sportsman to Candidate for Master of Sport and 38 non-athletes. Hormone concentrations in the blood (cortisol, TSH, FT4) and blood parameters (haemoglobin, red blood cell count (RBC), their mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC) and haematocrit (НСТ)) were determined. The subjects’ physical endurance was assessed by calculating the cardiorespiratory index (heart rate divided by the respiratory rate). Results. In young men not involved in sports, no statistically significant differences between red blood cell parameters and hormonal status depending on the cardiorespiratory index were observed. At the same time, athletes with low exercise tolerance had statistically significantly lower MCV, MCHC, FT4, and TSH as well as elevated cortisol levels compared to endurance athletes. In young male non-athletes, we established an inverse correlation of TSH with RBC (r = –0.27) and HCT (r = –0.31) as well as of FT4 with RBC (r = –0.35), HCT (r = –0.28) and cardiorespiratory index at rest (r = 0.29). In athletes, cortisol correlated with exercise tolerance (r = 0.74), while FT4 correlated with cardiorespiratory index after exercise (r = 0.69). Thus, a decrease in thyroxine and an increase in cortisol blood levels in athletes correlate with lower cardiorespiratory endurance and exercise tolerance, while in non-athletes, with the activation of the erythropoietic function.

Headache and cognitive disturbance correlate with ganglion cell layer thickness in patients who recovered from COVID-19

BackgroundRetinal abnormalities are being increasingly reported in COVID-19, in addition to the well-known symptoms of this disease accounting for the neurological involvement. In this study, we aimed to investigate whether ganglion cell layer thickness (GCLT) was different in recovered COVID-19 patients compared to controls in the subacute stage and to determine whether it correlated with COVID-19-related neurological symptoms or pneumonia. MethodsThis study involved 40 patients who had recovered from COVID-19 and 40 age- and sex-matched healthy controls. All the participants underwent ophthalmological examination, spectral domain optical coherence tomography and neurological examination. The clinical and biochemical properties of the patients were noted and their correlations with GCLT were sought. ResultsThe duration after COVID-19 infection was 113 ± 62 (mean ± SD) days. At this subacute stage, there was no significant difference between the GCLT measurements of the COVID-19 patients and the controls (14 ± 4.0 µm [median ± IQR] vs 16 ± 4.8 µm, respectively). When we analyzed the relationships with neurological symptoms in the patient group, we found that patients with cognitive symptoms had lower GCLT values compared to those without (13 ± 3 µm vs. 16 ± 4 µm, respectively; p = 0.002). Patients who suffered headache during the acute infection also had lower GCLT values compared to those without (14 ± 4 µm vs. 18 ± 5 µm, respectively; p = 0.015). The GCLT values did not differ significantly with respect to anosmia, ageusia, sleep disturbances, having had COVID-19 pneumonia, or smoking status. Age, duration after COVID-19, and blood levels of thyroid stimulating hormone, glucose, vitamin D and vitamin B12 were not in correlation with GCLT in our study. ConclusionOur findings highlight an association between GCLT values and neurological symptoms such as cognitive disturbance (brain fog) and headache in patients who had recovered after non-severe COVID-19 infection. Neuroretinal involvement by SARS-CoV2 might be linked to central neurological symptoms. The patients with lower GCLT values may benefit from close monitoring for neurological problems.

Successful surgical correction of ascending aortic dissection in a kidney transplant patient

Cardiovascular disease is the leading cause of death in patients with a transplanted kidney and in graft loss. We present the first clinical case of successful surgical correction of ascending aortic dissection (DeBakey type I) in a young patient with a functioning kidney graft. The patient underwent the first cadaveric kidney transplantation (KTx), which was complicated by acute humoral rejection and suboptimal graft function. High blood pressure, anemia, elevated blood levels of triglycerides, phosphorus, parathyroid hormone, and uric acid were recorded. A repeat KTx was performed five years later; the patient’s condition and kidney function were satisfactory. Three years later,the patient started experiencing severe pain along the thoracic and lumbar spine; his blood creatinine level was 408 μmol/L. Computed tomography and echocardiography diagnosed DeBakey type I aortic dissection (AD) with critical narrowing of the true aortic lumen at certain levels, dissection of aortic branches. Aortic resection surgery with prosthetic replacement of the ascending aorta according to David procedure with reimplantation of coronary artery orifices according to Kouchoukos technique, prosthetic replacement of the aortic arch with debranching of brachiocephalic artery and left common carotid artery were successfully performed as planned under endotracheal anesthesia, cardiopulmonary bypass and selective pharmacological cold cardioplegia. The peculiarities of the course, possible causes and outcomes of surgical correction of thoracic AD in the patient are discussed.

The HERITAGE Family Study: A Review of the Effects of Exercise Training on Cardiometabolic Health, with Insights into Molecular Transducers.

ABSTRACTThe aim of the HERITAGE Family Study was to investigate individual differences in response to a standardized endurance exercise program, the role of familial aggregation, and the genetics of response levels of cardiorespiratory fitness and cardiovascular disease and diabetes risk factors. Here we summarize the findings and their potential implications for cardiometabolic health and cardiorespiratory fitness. It begins with overviews of background and planning, recruitment, testing and exercise program protocol, quality control measures, and other relevant organizational issues. A summary of findings is then provided on cardiorespiratory fitness, exercise hemodynamics, insulin and glucose metabolism, lipid and lipoprotein profiles, adiposity and abdominal visceral fat, blood levels of steroids and other hormones, markers of oxidative stress, skeletal muscle morphology and metabolic indicators, and resting metabolic rate. These summaries document the extent of the individual differences in response to a standardized and fully monitored endurance exercise program and document the importance of familial aggregation and heritability level for exercise response traits. Findings from genomic markers, muscle gene expression studies, and proteomic and metabolomics explorations are reviewed, along with lessons learned from a bioinformatics-driven analysis pipeline. The new opportunities being pursued in integrative -omics and physiology have extended considerably the expected life of HERITAGE and are being discussed in relation to the original conceptual model of the study.

Histopathological and immunohistochemical evaluation for detecting changes in blood hormone levels caused by endocrine disruptors in a 28-day repeated-dose study in rats.

Although measurements of blood hormone levels in rodent toxicological studies can provide important information on the mechanisms of toxicity and extrapolation to humans, there are several difficulties such as large individual differences and limited sample volume. To develop a more simplified method that does not depend solely on blood samples, we examined the possible application of immunohistochemistry for detecting endocrine disruptors in short-term studies. Aminotriazole (AMT), propylthiouracil (PTU), phenobarbital, aminoglutethimide (AGT), estradiol, and vitamin D3 were administered orally to 6-week-old male and female SD rats (five/group) for 28 days. Measurements of serum hormone levels revealed decreases in triiodothyronine (T3) and thyroxine (T4) in the AMT and PTU groups, an increase in thyroid stimulating hormone (TSH) in the AMT, PTU, and AGT groups, and an increase in adrenocorticotrophic hormone in the AGT group. Increased thyroid, pituitary, and adrenal gland weights; histopathological lesions, including follicular hypertrophy/hyperplasia, hypertrophy/vacuolation of anterior pituitary cells, and increased adrenocortical vacuolation were observed in association with the hormone level changes. Immunohistochemical analysis revealed a decreased T4 level in the thyroid gland of the AMT and PTU groups and an increased area of TSH positive immunostaining in the pituitary gland of the AMT, PTU, and AGT groups, consistent with the changes in serum T4 and TSH levels, respectively. These results suggest that histopathological analysis and immunohistochemistry for T4 and TSH might be useful and sensitive methods of detecting thyroid dysfunction, and that combining organ weight measurements is a reliable parameter of detecting endocrine disruptors.

Estimating neonatal screening for congenital hypothyroidism test performance

Introduction: Newborn screening (NBS) is a system of organized search in the entire neonatal population for specific diseases. In Bosnia and Herzegovina, two diseases are included in NBS, congenital hypothyroidism (CH), and phenylketonuria. The screening for CH is based on determination of thyroid stimulating hormone (TSH) levels in blood obtained by heel prick method. The aim of this study is to evaluate the effectiveness of NBS program for CH based on TSH and establish the mean age of diagnosis of CH.Methods: TSH was measured by time-resolved fluoroimmunoassay (DELFIA Neonatal hTSH kit). The TSH cutoff value was 9 μU/mL. Neonates with TSH < 9 μU/mL had a negative NBS result. Neonates with TSH ≥ 9 μU/mL were recalled for a confirmation test and thyroid hormones were determined from venous blood to establish diagnosis of CH.Results: A total of 24,351 neonates were subjected to NBS in our institution. A total of 164 newborns with TSH ≥ 9 μU/ml were sent to additional testing (mean recall rate of 0.68%) at a mean age of 11.4 ± 0.5 days of life. In this group, diagnosis of CH was confirmed in 22 neonates (13.41%). The mean rate of false positive results of NBS was 0.59%. The incidence of CH in Sarajevo Canton ranged from 1/2477 in 2018 to 1/641 in 2020. The mean incidence of CH over a 5-year period was 1/1085, while the mean age at the time of diagnosis was 16.5 ± 1.2 days.Conclusion: The analysis of NBS on congenital hypothyroidism data showed the satisfactory recall and false positive rate and indicated well selected TSH cutoff value. The mean age at the time of diagnosis assures early treatment and good neurological outcome in neonates with CH.

The Association between Peptide Hormones with Obesity and Insulin Resistance Markers in Lean and Obese Individuals in the United Arab Emirates.

Peptide hormones play a crucial role in body weight and glucose homeostasis. In this study, we aimed to explore this association and recruited 43 obese and 31 age- and sex-matched lean participants. We assessed their body mass index (BMI), waist circumference (WC), waist-to-height ratio (WtHR), percentage body fat (PBF), fasting blood levels of peptide hormones (GLP-1, GLP-2, insulin, leptin, ghrelin, CCK, and PYY), fasting blood sugar (FBS), and Homeostatic Model Assessment of Insulin Resistance (HOMA-IR). We tested the associations between peptide hormones and markers of obesity and insulin resistance (IR) by using the Independent-Samples t-test and Mann-Whitney U test, partial correlation, and logistic regression. FBS, insulin, HOMA-IR, GLP-1, GLP-2, and leptin were significantly higher in the obese group; ghrelin and CCK were significantly higher in lean participants, and no difference was seen for PYY. Controlling for BMI, GLP-1 was positively correlated with WtHR, while ghrelin was inversely correlated with WtHR. GLP-1 was correlated with HOMA-IR. GLP-1 was associated with obesity and IR markers in the regression model. Our results show that obese and lean adults display significant differences in plasma peptide hormone levels. GLP-1 levels were independently associated with markers of obesity and IR. Restoring the appetite hormone balance in obesity may represent a potential therapeutic target.

Association between fasting blood glucose and thyroid stimulating hormones and suicidal tendency and disease severity in patients with major depressive disorder

Thyroid dysfunction and diabetes are reported to be associated with depression. However, their role in the suicide risk in patients with major depressive disorder (MDD) is unclear. The purpose of this study was to investigate and compare thyroid dysfunction and diabetes between suicide attempters and non-suicide attempters in a large sample of first-episode drug-naïve MDD patients. A descriptive study was conducted on 1279 Chinese outpatients with a diagnosis of first-episode MDD. Their socio-demographic information, blood levels of thyroid hormones, glucose, lipids and body mass index (BMI) parameters were collected. The positive subscales of the positive and negative syndrome scale (PANSS), Hamilton anxiety rating scale (HAMA), Hamilton depression rating scale (HAMD) were measured for psychotic, anxiety and depressive symptoms. Our results showed that compared with non-suicide attempters (p < 0.01), suicide attempters had statistically higher scores on HAMD, HAMA and PANSS psychotic symptoms, as well as higher thyroid stimulating hormone (TSH) serum levels, glucose, anti-thyroglobulin (A-TG), anti-thyroid peroxidase (A-TPO), total cholesterol (TC), triglycerides (TG), low density lipoprotein cholesterol (LDL-C), systolic blood pressure, and diastolic blood pressure (all with p < 0.001). These results revealed that TSH, A-TG, A-TPO, TC, TG, and LDL-C may be promising biomarkers of suicide risk in MDD, implying the importance of regular assessment of blood glucose level and thyroid function parameters for suicide prevention, along with possible treatment for impaired thyroid function and diabetes for the suicide intervention in MDD patients. Such patients with abnormal blood sugar and TSH must undergo thorough screening for suicidal ideation.

Development of an experimental model of tumor growth under hypothyroidism

Development of an experimental model of tumor growth under hypothyroidism

Hypoglycemia induces vascular endothelial dysfunction in subjects with normal glucose tolerance

This prospective study determined the effects of hypoglycemic stimulation on vascular endothelial function in non-diabetic patients using reactive hyperemia peripheral arterial tonometry (RH-PAT). The study included non-diabetic patients who were hospitalized for an insulin tolerance test (ITT) for the diagnosis of hypoadrenocorticism or hypopituitarism. Vascular endothelial function was assessed using the reactive hyperemia index (RHI) measured by the RH-PAT. We also measured the levels of anterior pituitary hormone, adrenaline, noradrenaline, and dopamine at the time of hypoglycemia. The primary endpoint was a change in the RHI at 120 min after insulin administration. The study included 27 patients. ITT was associated with significant increases in systolic blood pressure, pulse rate, and the blood levels of adrenocorticotropic hormone, cortisol, growth hormone, adrenaline, noradrenaline, and dopamine. RHI significantly decreased after ITT from 2.24 ± 0.51 to 1.71 ± 0.42. A significant inverse correlation was observed between the change in RHI and change in adrenaline (r = − 0.670, p = 0.012). We concluded that hypoglycemic stimulation altered vascular endothelial function, as measured by RH-PAT, even in patients free of glucose intolerance. The observed deterioration in vascular endothelial function correlated with increases in catecholamine levels during hypoglycemia.Trial registration: UMIN000033244.

근막 이완처치와 심부 근육마사지가 보디빌딩 선수들의 운동 후 DOMS 회복과 생리적, 심리적 요인에 미치는 영향

This study analyzed the effective management to bodybuilders for delay onset of muscle soreness (DOMS), physiological factors and psychological stability by comparison between myofascial release technique (MF technique), deep tissue massage (DT massage) and both. Ten young adult males who experienced bodybuilders performed strength exercise by weight lifting were recruited. Each therapeutic procedure was done for 2 weeks after training and visual analogue scale (VAS) of DOMS at 24 hours and 48 hours after training were checked, respectively. Each therapeutic procedure was done for 2weeks, and than flexibility, muscle size, blood levels of LDH, CK, cortisol, hormones and hemoglobin and psychological effect on depression, anxiety, stress and sleep quality of each groups were evaluated. The results of the difference between before and after the treatment are as follows. For DOMS and flexibility, DT massage and both technique were more effective methods for relieving soreness than MF technique. Psychologic releaf was observed in both techniques, DT massage showed more effective in providing psychological stability compared with MF technique. And serum cortisol level was decreased after DT massage and both technique. No differences were observed between three groups on muscle size gain significantly. In between three groups, DT massage is more effective method on DOMS and psychological stability of athletes than MF technique.

Gonadotropins at Advanced Age - Perhaps They Are Not So Bad? Correlations Between Gonadotropins and Sarcopenia Indicators in Older Adults.

Many hormones fluctuate during the aging process. It has been suggested that gonadotropins, which increase with age, contribute to the occurrence of many diseases and syndromes in older life, such as cardiovascular diseases, obesity, frailty syndrome and osteoporosis. This study aims to assess the relationship between circulating gonadotropins and other hormones potentially contributing to age-related functional decline and sarcopenia indicators in 39 male and 61 female community-dwelling seniors, mean age 80 years. According to the definition developed by the second European Working Group on Sarcopenia in Older People (EWGSOP2), the following indicators of the sarcopenia were assessed: bioimpedance-measured body composition, gait speed, handgrip strength, timed up and go test (TUG), chair stand test, Short Physical Performance Battery (SPPB). Blood levels of follicle-stimulating hormone (FSH), luteinizing hormone (LH), estradiol, testosterone, dehydroepiandrosterone sulphate (DHEAS) and cortisol were also measured. In the men, FSH and partially LH correlated positively with muscle mass percentage, gait speed, handgrip strength and SPPB, and negatively with percent body fat. Additionally, testosterone and DHEAS correlated negatively with the percentage of fat mass in men. Whereas in the women, FSH and LH were mainly negatively associated with body mass and adipose tissue measures. Cortisol did not show any relationship with the examined indicators. The study shows that the indicators of sarcopenia are strongly associated with levels of gonadotropins, sex hormones and DHEAS, especially in older men. The obtained results, after being confirmed in a larger group, may modify prevention and treatment strategies of sarcopenia.

A high-protein total diet replacement alters the regulation of food intake and energy homeostasis in healthy, normal-weight adults

PurposeDietary intake can affect energy homeostasis and influence body weight control. The aim of this study was to compare the impact of high-protein total diet replacement (HP-TDR) versus a control (CON) diet in the regulation of food intake and energy homeostasis in healthy, normal-weight adults.MethodsIn this acute randomized controlled, cross-over study, participants completed two isocaloric arms: a) HP-TDR: 35% carbohydrate, 40% protein, and 25% fat; b) CON: 55% carbohydrate, 15% protein, and 30% fat. The diets were provided for 32 h while inside a whole-body calorimetry unit. Appetite sensations, appetite-related hormones, and energy metabolism were assessed.ResultsForty-three healthy, normal-weight adults (19 females) participated. Appetite sensations did not differ between diets (all p > 0.05). Compared to the CON diet, the change in fasting blood markers during the HP-TDR intervention was smaller for peptide tyrosine-tyrosine (PYY; − 18.9 ± 7.9 pg/mL, p = 0.02) and greater for leptin (1859 ± 652 pg/mL, p = 0.007). Moreover, postprandial levels of glucagon-like peptide 1 (1.62 ± 0.36 pM, p < 0.001) and PYY (31.37 ± 8.05 pg/mL, p < 0.001) were higher in the HP-TDR. Significant correlations were observed between energy balance and satiety (r = − 0.41, p = 0.007), and energy balance and PFC (r = 0.33, p = 0.033) in the HP-TDR.ConclusionCompared to the CON diet, the HP-TDR increased blood levels of anorexigenic hormones. Moreover, females and males responded differently to the intervention in terms of appetite sensations and appetite-related hormones.Trial registrationNCT02811276 (retrospectively registered on 16 June 2016) and NCT03565510 (retrospectively registered on 11 June 2018).

Surgical treatment of unilateral nodular goiter with compression syndrome in patients with autoimmune thyroiditis

Aim — todetermine indications for the choice of the surgery scope in patients with unilateral nodular goiter with compression syndrome against the background of autoimmune thyroiditis (AIT) and possibility of prognosis of the long-term results of surgical treatment.Materials and methods. The analysis has been performed for the long-term results of hemithyroidectomy in 101 femalepatients aged 23 to 72 years with unilateral nodular goiter against the background of AIT (NGAIT) with compression syndrome. The pre-operational levels of the following parameters, definingsatisfactory and unsatisfactory treatment results, have been analyzed: volume of the lobe of the gland, blood levels of thyroid stimulating hormone, free thyroxine and triiodothyronine, antibodies to thyroid peroxidase, indices of apoptosisand proliferation, variants ofechostructure.Results. Satisfactory results have been established in 75 patients based on the following results of examinations 3 years after hemithyroidectomy: no violations of thyroid gland functional state, andno progression of preoperative AIT signs or progression without hypothyroidism and changesin ultrasound picture in the parenchymaof the remaining lobe of the gland according to the data of ultrasound investigation.Unsatisfactory results were definedin 26 subjects: an increase in the volume of the remaining thyroid gland and the progression of autoimmune process with the development of hypothyroidism. A satisfactory result of hemithyroidectomy in the treatment of patients with NGAIT with compression syndrome can be expected in cases where at the time of surgery the volume of the lobe was not more than 12.7 cm3, its echostructure corresponded to hypoechoic and heterogeneous and pseudomicronodular variants, and the following blood levels were established: thyroid stimulating hormone &lt; 2.85 IU/L, free thyroxine &gt; 16.7 pmol/l, free triiodothyronine &gt; 5.3 pmol/l, antibodies to thyroid peroxidase &lt; 137 IU/ml.Conclusions. One of the possible options for surgical treatment of patients with unilateral nodular goiter against the background of AIT with compression syndrome may be hemithyroidectomy in conditions of preserved hormonal function of the gland with moderately pronounced processes of proliferation and apoptosis, structural changes in the parenchyma at the level of hypoechoic and heterogeneous and pseudomicro-nodal echostructural variants. The use of hemithyroidectomy is contraindicatedin cases of pseudo-large-nodular and more severe variants of the echostructure of the thyroid parenchyma, regardless of the indicators of hormone-producing function, antibodies to thyroid peroxi­dase, proliferation and apoptosis.

Insulin resistance biomarkers in small-for-gestational-age infants born to mothers with gestational diabetes mellitus

Objective Early alterations in glucose homeostasis increase the risk of developing insulin resistance (IR) and obesity later in life. The study aimed to ascertain the peripheral blood levels of hormones that controlling glucose homeostasis and inflammatory factors that are correlated with IR and fetal outcomes in small-for-gestational-age (SGA) infants born to mothers with gestational diabetes mellitus (GDM). Methods This cohort study included a total of 90 SGA infants born to mothers with GDM (n = 37) and without GDM (n = 53). At birth, blood levels of glucose, insulin, C-peptide, growth hormone (GH), IGFBP3, lipid profiles, fibrinogen, and hypersensitive C-reactive protein (Hs-CRP) were measured; homeostatic model assessment-IR (HOMA-IR) and ponderal index were calculated. All newborns were followed up to the first year of life. Results Compared with SGA infants born to mothers without GDM, the levels of low-density lipoprotein-cholesterol (LDL-C), GH, and fibrinogen were significantly higher in the SGA infants born to mothers with GDM (p = .048, .045, and .04, respectively). However, total cholesterol, HDL-C, and apolipoprotein(a) levels were significantly lower in the SGA infants born to mothers with GDM when compared with those in with SGA infants born to mothers without GDM (all p < .05). Weight gain in the first year was higher in the SGA infants born to mothers with GDM group than SGA infants born to mothers without GDM [6644 g (5991–7572) vs. 6032 g (5529–6932)]. Conclusions Altered biomarkers of IR were observed among SGA infants born to mothers with GDM, suggesting that these infants were more prone to develop IR after birth.

The effects of Levilactobacillus brevis on the physiological parameters and gut microbiota composition of rats subjected to desynchronosis

BackgroundAll living organisms have developed during evolution complex time-keeping biological clocks that allowed them to stay attuned to their environments. Circadian rhythms cycle on a near 24 h clock. These encompass a variety of changes in the body ranging from blood hormone levels to metabolism, to the gut microbiota composition and others. The gut microbiota, in return, influences the host stress response and the physiological changes associated with it, which makes it an important determinant of health. Lactobacilli are traditionally consumed for their prophylactic and therapeutic benefits against various diseases, namely, the inflammatory bowel syndrome, and even emerged recently as promising psychobiotics. However, the potential role of lactobacilli in the normalization of circadian rhythms has not been addressed.ResultsTwo-month-old male rats were randomly divided into three groups and housed under three different light/dark cycles for three months: natural light, constant light and constant darkness. The strain Levilactobacillus brevis 47f was administered to rats at a dose of 0.5 ml per rat for one month and The rats were observed for the following two months. As a result, we identified the biomarkers associated with intake of L. brevis 47f. Changing the light regime for three months depleted the reserves of the main buffer in the cell—reduced glutathione. Intake of L. brevis 47f for 30 days restored cellular reserves of reduced glutathione and promoted redox balance. Our results indicate that the levels of urinary catecholamines correlated with light/dark cycles and were influenced by intake of L. brevis 47f. The gut microbiota of rats was also influenced by these factors. L. brevis 47f intake was associated with an increase in the relative abundance of Faecalibacterium and Roseburia and a decrease in the relative abundance of Prevotella and Bacteroides.ConclusionsThe results of this study show that oral administration of L. brevis 47f, for one month, to rats housed under abnormal lightning conditions (constant light or constant darkness) normalized their physiological parameters and promoted the gut microbiome's balance.

Response to iodine supplementation in the growth and quality of Texel lamb meat

Iodine deficiency determines reproductive problems especially in the production of thyroid hormone, affecting the functions that thyroidal hormones regulate, such as energy metabolism, thermoregulation, reproduction, growth, muscle and bone tissue function. Indeed a certain concentration of iodine in the diet can promote performance in production in terms of fattening and growth. The main goal of the work was the supplementation with iodine salt from weaning to work on the production and quality of carcass and meat of early lambs of the Texel breed. Three random groups were formed. In one group, iodine salt was administered daily individually, in another group salt without iodine and finally a third "control" group without salt aggregate. All these animals were fed on natural field with an energy-protein supplement. The weaning weight and its evolution (daily gain) were determined, fortnightly until the work weight (35 kg) was reached. Blood levels of thyroid-stimulating hormone (TSH) and Selenium (Se) were evaluated. In the carcass were measured the hot and cold carcass weight, pH, colour; GR point and in the meat tenderness will be determined in the Longissimus dorsi muscle. Se concentrations, neutral detergent fiber, crude protein and iodine in pastures were also determined. The results show that no significant differences were found for any of the characters measured.

Testicular induced corticosterone synthesis in male rats under fasting stress

Testicular steroidogenesis is depressed by adrenal-secreted corticosterone (CORT) under stress. However, the mechanisms are not well understood. This study investigated the details of testicular steroidogenesis depression during fasting. Blood levels of adrenocorticotropic hormone secreted from the pituitary glands increased, but blood CORT was not changed in rats that fasted for 96 h, in spite of the rats being severely stressed. CORT in fasting adult male rats increased more than three times in the testis, but reduced testicular testosterone (T) and blood T levels to 5% and 2% of the control, respectively, was observed. The contents of T precursor (except PGN) were drastically reduced in the fasted-rat testes. Testicular CORT levels were elevated, but the enzymatic activity of cytochrome P45011β, which produces CORT, remained unchanged. The enzymatic activities of 3β-hydroxysteroid dehydrogenase (3β-HSD), mediating the conversion of pregnenolone to progesterone, decreased in the fasted-rat testes. Thus, fasting suppressed testicular steroidogenesis by affecting the enzyme activity of 3β-HSD in the testes and drastically reduced T and increased CORT synthesis. It can be considered that T synthesis involved in cell proliferation is suppressed due to lack of energy during fasting. Conversely, 11β-hydroxylase enzyme activity was induced and CORT synthesis is increased to cope with the fasting stress. Hence, it can be concluded that CORT synthesis in the testes plays a role in the local defense response.

Stellanin: a promising medical drug for accompanying therapy in lung cancer treatment

One of the cancer prevention measures involves the correctionof the altered functions of the body’s regulatory systems. Manymalignant tumors are accompanied by the thyroid system dysfunction.The aim of our study was to reveal an effect of an iodine-containingdrug on the development of a tumor process in thelungs and the level of thyroid hormones in blood and the thyroidgland in male rats.Material and methods. Outbred white male rats were dividedinto the following groups: a group of intact animals (n=7); acomparison group – 5 weeks after an intravenous inoculationof sarcoma 45 (S45) at 2*106 (n=7); a main group – 5 weeks afteran intravenous inoculation of S45 and intragastric administrationof Stellanin at a single dose of 0.4 mg/kg within an hourafter the inoculation (n=10). RIA was used to determine levels offree (F) and total triiodothyronine (T3) and thyroxine (T4) in theblood serum and the thyroid.Results. The lungs of rats in the comparison group were totallyaffected by the tumor, and the thyroid gland showed asharp decrease in the levels of all hormone forms: T4 – by 18.7times, T3 – by 8.5 times, FТ4 – by 8.1 times, FТ3 – by 21.3 times,while only FТ4 and FТ3 decreased in blood by 2.5 and 1.5 times,respectively (p&lt;0.05). No tumor lesions were detected in thelungs of rats of the main group, and the hormone levels exceededthe levels in the comparison group: in the thyroid, FT4by 3.7, T4 by 15.0 and T3 by 6.0 times; in blood, FT4 by 3.3 andFT3 by 1.7 times.Conclusions. The effect of Stellanin inhibiting malignantgrowth of S45 in the lungs is accompanied by the restoration oflow levels of thyroid hormones in the thyroid and blood.

Homocysteine, pituitary and thyroid hormones in children with different physical development levels after forest fires in the Chornobyl exclusion zone

Objective We performed a comparative assessment of the blood levels of homocysteine, pituitary and thyroid hormones in children with different levels of physical development before and after forest fires in the Chornobyl exclusion zone (ChEZ) in 2015. Methods: We used immunochemical, instrumental, mathematical and statistical methods. Results: The analysis of variable dynamics was performed in 336 adolescents of the Polisskyi and the Ivankivskyi districts of Kyiv region. An association was found between homocysteine (Нсу), hormones of the pituitary-thyroid axis and physical development of children. A statistically significantly higher level of Нсу was observed in the adolescents from the Ivankivskyi district in comparison with the children from the Polisskyi district. Forest fires in the spring and summer of 2015 in the ChEZ should be considered the main cause for the increase in Нсу in the blood of the adolescents. The increased level of Т3 in the peripheral tissues induced by Нсy and TSH contributed to a decrease in the physical development index values. Due to a decrease in the intensity of the Т4 deiodination process, the insufficient formation of Т3 in the peripheral tissues was recorded in the group of children with a disharmonious high physical development.