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stress and testosterone

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https://www.readbyqxmd.com/read/29030260/cyanidin-3-o-glucoside-promotes-the-biosynthesis-of-progesterone-through-the-protection-of-mitochondrial-function-in-pb-exposed-rat-leydig-cells
#1
Luona Wen, Xinwei Jiang, Jianxia Sun, Xia Li, Xusheng Li, Lingmin Tian, Ye Li, Weibin Bai
Cyanidin-3-O-glucoside (C3G) is an anthocyanin that has been reported to reduce the toxicity of heavy metals. In the present study, the protection effects of C3G on the biosynthesis of progesterone, the precursor of testosterone, against lead (Pb) in R2C rat Leydig cells were examined. Treatment of R2C cells with 100 μM Pb resulted in a significant decrease in progesterone production. After being cultured in a medium containing C3G and Pb, R2C cells exhibited an increase in progesterone concentration compared with the Pb treatment, as a result of up-regulation of the expression of the steroidogenic enzymes steroidogenic acute regulatory protein (StAR), 3β-hydroxysteroid dehydrogenase (3β-HSD) and cytochrome P450 enzyme cholesterol side chain cleavage enzyme (CYP11A1)...
October 10, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28994489/short-term-resource-allocation-during-extensive-athletic-competition
#2
Daniel P Longman, Sean P Prall, Eric C Shattuck, Ian D Stephen, Jay T Stock, Jonathan C K Wells, Michael P Muehlenbein
OBJECTIVES: Following predictions from life history theory, we sought to identify acute trade-offs between reproductive effort (as measured by psychological arousal) and somatic maintenance (via functional measures of innate immunity) during conditions of severe energetic imbalance. METHODS: Sixty-six male ultramarathon runners (ages 20 to 37 years) were sampled before and after a lengthy race. Saliva and sera were collected for testosterone and immunological analyses (hemolytic complement activity and bacterial killing ability)...
October 10, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28972598/evaluation-of-occupational-physical-load-during-6-month-international-crisis-management-operation
#3
Kai Pihlainen, Matti Santtila, Tommi Vasankari, Keijo Häkkinen, Heikki Kyröläinen
OBJECTIVES: Generally, operational military duties are associated with a variety of stressors, such as prolonged physical activity (PA). However, limited information is available on the occupational workload or changes in PA during international military operations. Thus, the aim of the study was to investigate the changes in body composition, stress biomarkers, PA, and heart rate (HR) responses of 79 male soldiers during a 6-month international crisis management operation. MATERIAL AND METHODS: Measurements were conducted 3 times in South-Lebanon during the operation...
October 2, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28969511/interactive-effects-of-chronic-stress-and-a-high-sucrose-diet-on-nonalcoholic-fatty-liver-in-young-adult-male-rats
#4
Adriana Corona-Pérez, Mauricio Díaz-Muñoz, Estela Cuevas-Romero, Dalia Luna-Moreno, Héctor Valente-Godínez, Olivia Vázquez-Martínez, Margarita Martínez-Gómez, Jorge Rodríguez-Antolín, Leticia Nicolás-Toledo
Glucocorticoids have been implicated in nonalcoholic fatty liver diseases (NAFLD). The influence of a palatable diet on the response to stress is controversial. This study explored whether a high-sucrose diet could protect from hepatic steatosis induced by chronic restraint stress in young adult rats. Male Wistar rats aged 21 days were allocated into four groups (n = 6-8 per group): control, chronic restraint stress, 30% sucrose diet, and 30% sucrose diet plus chronic restraint stress. After being exposed to either tap water or sucrose solution during eight weeks, half of the rats belonging to each group were subject or not to repeated restraint stress (1 h per day, 5 days per week) during four weeks...
October 2, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28968462/dietary-docosahexaenoic-acid-supplementation-prevents-the-formation-of-cholesterol-oxidation-products-in-arteries-from-orchidectomized-rats
#5
Diva M Villalpando, Mibsam M Rojas, Hugo S García, Mercedes Ferrer
Testosterone deficiency has been correlated with increased cardiovascular diseases, which in turn has been associated with increased oxidative stress. Several studies have considered cholesterol oxidation products (COPs) as oxidative stress biomarkers, since some of them play pro-oxidant and pro-inflammatory roles. We have previously described the cardioprotective effects of a dosahexaenoic acid (DHA) supplemented diet on the aortic and mesenteric artery function of orchidectomized rats. The aim of this study was to investigate whether impaired gonadal function alters the formation of COPs, as well as the potential preventive role of a DHA-supplemented diet on that effect...
2017: PloS One
https://www.readbyqxmd.com/read/28967725/testicular-and-thyroid-function-as-survival-predictors-in-the-elderly-patient-candidate-to-surgery
#6
Antonio Aversa, Andrea Fabbri
The relationship between testosterone deficiency (TD) syndrome and surgical resilience has a great impact in the modern approach to male elderly patients. There is good evidence that low levels of T are a strong marker for cardiovascular risk; also, TD is frequently associated with increased cardiovascular and all-cause mortality especially in cardiac older frail men. Screening for low T should be mandatory in high risk groups candidate to surgery including those with diabetes, metabolic syndrome and obesity, even though benefits from T-treatment on survival rates are unclear...
July 18, 2017: Monaldi Archives for Chest Disease, Archivio Monaldi Per le Malattie del Torace
https://www.readbyqxmd.com/read/28965657/interactive-effects-of-ethanol-on-ulcerative-colitis-and-its-associated-testicular-dysfunction-in-pubertal-balb-c-mice
#7
Isaac A Adedara, Babajide O Ajayi, Ifeoluwa O Awogbindin, Ebenezer O Farombi
Available epidemiological reports have indicated an increase in the incidence of ulcerative colitis, as well as alcohol consumption, globally. The present study investigated the possible interactive effects of ethanol consumption on ulcerative colitis and its associated testicular dysfunction using six groups of 12 pubertal mice each. Group I (Control) mice received drinking water alone. Group II mice received ethanol alone at 5 g/kg body weight. Group III mice received 2.5% dextran sulphate sodium (DSS) in drinking water followed by normal drinking water...
November 2017: Alcohol
https://www.readbyqxmd.com/read/28965259/sexual-activity-affects-the-redox-profile-along-the-aging-process-in-male-rats
#8
Tiago Boeira Salomon, Mara Silveira Benfato
The disposable soma theory postulates that aging might be the result of tradeoffs between early life reproduction and longevity, thereby involving the costs of reproduction in the expected lifespan. It is known that redox biochemistry plays a major role in these processes. To assess long term effects of reproduction, we analyzed redox rates and the testosterone levels at four different ages, and we performed a principal component analysis between redox measures of five different organs followed by a cluster analysis to determine correlations...
September 30, 2017: Biogerontology
https://www.readbyqxmd.com/read/28959662/%C3%AE-lipoic-acid-inhibits-oxidative-stress-in-testis-and-attenuates-testicular-toxicity-in-rats-exposed-to-carbimazole-during-embryonic-period
#9
P Prathima, K Venkaiah, R Pavani, T Daveedu, M Munikumar, M Gobinath, M Valli, S B Sainath
The aim of this study was to evaluate the probable protective effect of α-lipoic acid against testicular toxicity in rats exposed to carbimazole during the embryonic period. Time-mated pregnant rats were exposed to carbimazole from the embryonic days 9-21. After completion of the gestation period, all the rats were allowed to deliver pups and weaned. At postnatal day 100, F1 male pups were assessed for the selected reproductive endpoints. Gestational exposure to carbimazole decreased the reproductive organ indices, testicular daily sperm count, epididymal sperm variables viz...
2017: Toxicology Reports
https://www.readbyqxmd.com/read/28928235/testosterone-protects-high-fat-low-carbohydrate-diet-induced-non-alcoholic-fatty-liver-disease-in-castrated-male-rats-mainly-via-modulating-er-stress
#10
Yue Jia, Jennifer Kuang Yee, Christina Wang, Liana Nikolaenko, Maruja Diaz-Arjonilla, Joshua N Cohen, Samuel W French, Peter Y Liu, YanHe Lue, Wai-Nang Paul Lee, Ronald S Swerdloff
We previously showed that testosterone (T) deficiency enhanced high-fat diet (HFD) induced hepatic steatosis in rats that was independent of insulin resistance, and that T replacement reduced hepatic macrovesicular fat accumulation and inflammation. The present report explores the mechanism of T-protective effects on HFD-induced steatohepatitis. Adult male rats were randomized into four treatment groups for 15 weeks (intact rats on regular chow diet or HFD, and castrated rats on HFD with/without T replacement)...
September 19, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28927970/hormonal-response-patterns-are-differentially-influenced-by-physical-conditioning-programs-during-basic-military-training
#11
Jace R Drain, Herbert Groeller, Simon D Burley, Bradley C Nindl
OBJECTIVES: Compare traditional military physical training and more contemporary physical training on catabolic and anabolic hormones and body composition in recruits undertaking basic military training (BMT). DESIGN: A prospective cross-sectional study design. METHODS: Two recruit intakes were assessed over the 12-week Australian Army BMT course. The control group (CON) comprised 40 recruits (26M/14F) and the experimental group (EXP) comprised 35 recruits (25M/10F)...
September 6, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28919553/social-evaluative-threat-with-verbal-performance-feedback-alters-neuroendocrine-response-to-stress
#12
Jenny M Phan, Ekaterina Schneider, Jeremy Peres, Olga Miocevic, Vanessa Meyer, Elizabeth A Shirtcliff
Laboratory stress tasks such as the Trier Social Stress Test (TSST) have provided a key piece to the puzzle for how psychosocial stress impacts the hypothalamic-pituitary-adrenal axis, other stress-responsive biomarkers, and ultimately wellbeing. These tasks are thought to work through biopsychosocial processes, specifically social evaluative threat and the uncontrollability heighten situational demands. The present study integrated an experimental modification to the design of the TSST to probe whether additional social evaluative threat, via negative verbal feedback about speech performance, can further alter stress reactivity in 63 men and women...
September 20, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28912924/relationship-between-serum-total-testosterone-concentration-and-augmentation-index-at-radial-artery-in-japanese-postmenopausal-patients
#13
Takashi Hitsumoto
BACKGROUND: The significance of testosterone as a risk factor for cardiovascular disease (CVD) in females is controversial. This cross-sectional study aimed to elucidate the relationship between serum total testosterone concentration (T-T) and augmentation index at the radial artery (r-AIx) as a marker of arterial function in Japanese postmenopausal patients. METHODS: A total of 447 postmenopausal patients with traditional cardiovascular risk factors and/or a history of CVD (age (mean ± standard deviation (SD)), 73 ± 10 years) were enrolled...
October 2017: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/28911168/developmental-programming-impact-of-gestational-steroid-and-metabolic-milieus-on-mediators-of-insulin-sensitivity-in-prenatal-testosterone-treated-female-sheep
#14
Muraly Puttabyatappa, Victoria Andriessen, Makeda Mesquitta, Lixia Zeng, Subramaniam Pennathur, Vasantha Padmanabhan
Prenatal testosterone (T) excess in sheep leads to peripheral insulin resistance (IR), reduced adipocyte size, and tissue-specific changes, with liver and muscle but not adipose tissue being insulin resistant. To determine the basis for the tissue-specific differences in insulin sensitivity, we assessed changes in negative (inflammation, oxidative stress, and lipotoxicity) and positive mediators (adiponectin and antioxidants) of insulin sensitivity in the liver, muscle, and adipose tissues of control and prenatal T-treated sheep...
September 1, 2017: Endocrinology
https://www.readbyqxmd.com/read/28904557/ginger-ingredients-alleviate-diabetic-prostatic-complications-effect-on-oxidative-stress-and-fibrosis
#15
Basma G Eid, Hala Mosli, Atif Hasan, Hany M El-Bassossy
Prostatic complications are common in patients with diabetes. This study investigated the effect of different ginger ingredients: zingerone, geraniol, and 6-gingerol on the prostate in diabetic rats. Diabetes was induced in Wistar rats by streptozotocin intraperitoneal injection (50 mg/kg), and the rats were left for 10 weeks to develop prostatic complications. In diabetic treated groups, rats received daily oral zingerone, geraniol, and 6-gingerol in doses of 20, 200, and 75 mg/kg, respectively, in the last 8 weeks...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28888695/characterization-of-seasonal-reproductive-and-stress-steroid-hormones-in-wild-radiated-tortoises-astrochelys-radiata
#16
Andrea F T Currylow, Tsilavo H Rafeliarisoa, Edward E Louis, Craig B Stanford, Soary T Randrianjafizanaka, Sarah M Chinn, Daniel E Crocker
The critically endangered Radiated Tortoise (Astrochelys radiata) is endemic to the southern coastlines of Madagascar. Once common, wild populations of this tortoise have undergone dramatic declines in recent years. Although there have been studies documenting reproductive activities, reproductive physiological parameters are unknown yet may be crucial in the recovery of the species. Over four research seasons in remote field locations native to A. radiata, we surveyed for, radio-tracked, and sampled wild, free ranging tortoises...
September 6, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28880400/effects-of-ivermectin-and-its-combination-with-alpha-lipoic-acid-on-expression-of-igfbp-3-and-hspa1-genes-and-male-rat-fertility
#17
Z K El-Maddawy, W S H Abd El Naby
This study was conducted to evaluate the effects of ivermectin (IVM) with therapeutic dose (injected with 0.56 mg/kg b.wt.) either alone or combined with alpha lipoic acid (ALA) (50 mg/kg b.wt daily) on expression of testicular insulin-like growth factor binding protein-3 (IGFBP-3) and heat-shock protein A1 (HSPA1)) genes in the testes, as well as on male rat fertility parameters. Results revealed that expression levels of IGFBP-3 and HSPA1 were significantly increased in testis of the IVM-treated group relative to the control group...
September 7, 2017: Andrologia
https://www.readbyqxmd.com/read/28877872/insulin-sensitivity-leptin-adiponectin-resistin-and-testosterone-in-adult-male-and-female-rats-after-maternal-neonatal-separation-and-environmental-stress
#18
Hershel Raff, Brian Hoeynck, Mack Jablonski, Cole Leonovicz, Jonathan M Phillips, Ashley L Gehrand
Care of premature infants often requires parental and caregiver separation particularly during hypoxic and hypothermic episodes. We have established a neonatal rat model of human prematurity involving maternal-neonatal separation and hypoxia with spontaneous hypothermia prevented with external heat. Adults previously exposed to these neonatal stressors show a sex difference in the insulin and glucose response to arginine stimulation suggesting a state of insulin resistance. The current study used this cohort of adult rats to evaluate insulin resistance (Homeostatic Model Assessment of Insulin Resistance [HOMA-IR]), plasma adipokines (reflecting insulin resistance states), and testosterone...
September 6, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28868838/aluminium-induced-oxidative-stress-apoptosis-and-alterations-in-testicular-tissue-and-sperm-quality-in-wistar-rats-ameliorative-effects-of-curcumin
#19
Ebrahim Cheraghi, Alireza Golkar, Kambiz Roshanaei, Behrang Alani
Background: Reproductive toxicity is a major challenge associated with aluminum (Al) exposure. No studies have evaluated the possible effects of curcumin (CUR) on Al-induced reproductive dysfunction. Therefore, this study investigated the effects of CUR treatment on Al-induced reproductive damage. MATERIALS AND METHODS: In this experimental study, 40 male Wistar rats were allocated to the five groups (n=8) based on the treatment they received: no treatment (control), solvent [dimethyl sulfoxide (DMSO) or distilled water], CUR 10 mg/kg body weight (BW), Al chloride 10 mg/kg BW, and CUR+Al chloride (10 mg/kg BW/each alone)...
October 2017: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/28865351/exogenous-testosterone-enhances-cortisol-and-affective-responses-to-social-evaluative-stress-in-dominant-men
#20
Erik L Knight, Colton B Christian, Pablo J Morales, William T Harbaugh, Ulrich Mayr, Pranjal H Mehta
Stress often precedes the onset of mental health disorders and is linked to negative impacts on physical health as well. Prior research indicates that testosterone levels are related to reduced stress reactivity in some cases but correlate with increased stress responses in other cases. To resolve these inconsistencies, we tested the causal influence of testosterone on stress reactivity to a social-evaluative stressor. Further, prior work has failed to consider status-relevant individual differences such as trait dominance that may modulate the influence of testosterone on responses to stressors...
August 18, 2017: Psychoneuroendocrinology
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