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stress and testosterone

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https://www.readbyqxmd.com/read/27909455/salivary-testosterone-levels-under-psychological-stress-and-its-relationship-with-rumination-and-five-personality-traits-in-medical-students
#1
Reza Afrisham, Sahar Sadegh-Nejadi, Omid SoliemaniFar, Wesam Kooti, Damoon Ashtary-Larky, Fatima Alamiri, Mohammad Aberomand, Sedigheh Najjar-Asl, Ali Khaneh-Keshi
OBJECTIVE: The purpose of this study was to evaluate the salivary testosterone levels under psychological stress and its relationship with rumination and five personality traits in medical students. METHODS: A total of 58 medical students, who wanted to participate in the final exam, were selected by simple random sampling. Two months before the exam, in the basal conditions, the NEO Inventory short form, and the Emotional Control Questionnaire (ECQ) were completed...
November 2016: Psychiatry Investigation
https://www.readbyqxmd.com/read/27908416/suppression-of-the-brain-pituitary-testicular-axis-function-following-acute-arsenic-and-manganese-co-exposure-and-withdrawal-in-rats
#2
Isaac A Adedara, Amos O Abolaji, Ifeoluwa O Awogbindin, Ebenezer O Farombi
Despite the fact that most environmental exposures to metals do not occur in isolation, the combined effects of metal mixtures on brain-pituitary-gonadal axis are poorly known. The present study investigated the impacts of co-exposure to arsenic (As) and manganese (Mn) on sperm characteristics, reproductive hormones and selected oxidative stress indices in the brain, testes and epididymis of rats following exposure for 15 consecutive days to 60mg/L of AsO2Na and 30mg/L of MnCl2 in drinking water. The results showed that while the brain weight remained unaffected, the fluid intake and the weights of testes and epididymis significantly (p<0...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27892789/4-vinylcyclohexene-diepoxide-disrupts-sperm-characteristics-endocrine-balance-and-redox-status-in-testes-and-epididymis-of-rats
#3
Isaac A Adedara, Amos O Abolaji, Emmanuel O Ladipo, Ore J Fatunmibi, Ayodeji O Abajingin, Ebenezer O Farombi
OBJECTIVES: Exposure to 4-vinylcyclohexene diepoxide (VCD) was reported to induce testicular germ cell toxicity in rodents. However, there is paucity of information on the precise biochemical and molecular mechanisms of VCD-induced male reproductive toxicity. METHODOLOGY: This study investigated the influence of VCD on testicular and epidydimal functions following oral exposure of Wistar rats to VCD at 0, 100, 250 and 500 mg/kg for 28 consecutive days. RESULTS: Administration of VCD significantly decreased the body weight gain and organo-somatic indices of the testes and epididymis...
November 28, 2016: Redox Report: Communications in Free Radical Research
https://www.readbyqxmd.com/read/27888021/heightened-aggressive-behavior-in-mice-deficient-in-aldo-keto-reductase-1a-akr1a
#4
Takujiro Homma, Ryusuke Akihara, Satoshi Okano, Mototada Shichiri, Yasukazu Yoshida, Ken-Ichi Yamada, Satoshi Miyata, Osamu Nakajima, Junichi Fujii
Aldehyde reductase (Akr1a) is involved in the synthesis of ascorbic acid (AsA) which may play a role in social behavior. In the current study, we performed analyses on Akr1a-deficient (Akr1a(-/-)) mice that synthesize about 10% as much AsA as wild-type mice from the viewpoint of intermale aggression. The use of the resident-intruder test revealed that the Akr1a(-/-) mice exhibited more aggressive phenotypes than wild-type control mice. Unexpectedly, however, the oral administration of additional AsA failed to reduce the aggressive behavior of Akr1a(-/-) mice, suggesting that the heightened aggression was independent of AsA biosynthesis...
November 22, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27882589/attenuation-of-the-cyproterone-acetate-induced-testicular-hypofunction-by-a-novel-nutraceutical-lycopene-a-genomic-approach
#5
A Tripathy, A Ghosh, A Dey, B P Pakhira, D Ghosh
This study was designed to explore the cyproterone acetate (CPA)-induced andrological hypofunction and its correction by oral administration of lycopene. In this concern, spermatogenic, biochemical, histological and genomic profiles were studied. Cyproterone acetate administration for 1 month helped to develop infertile model rats. A significant recovery was noted in sperm motility, sperm count, sperm viability, hypo-osmotic swelling tail-coiled spermatozoa; activities of testicular ∆(5) , 3β-hydroxysteroid dehydrogenase (HSD), 17β-HSD, catalase (CAT) and superoxide dismutase (SOD); and levels of conjugated diene (CD), malondialdehyde (MDA), testicular cholesterol and serum testosterone after the administration of lycopene at 1...
November 24, 2016: Andrologia
https://www.readbyqxmd.com/read/27870443/sex-differences-in-depression-during-pregnancy-and-the-postpartum-period
#6
REVIEW
Inger Sundström Poromaa, Erika Comasco, Marios K Georgakis, Alkistis Skalkidou
Women have a lifetime risk of major depression double that of men but only during their reproductive years. This sex difference has been attributed partially to activational effects of female sex steroids and also to the burdens of pregnancy, childbirth, and parenting. Men, in contrast, have a reproductive period difficult to delineate, and research on the mental health of men has rarely considered the effects of fatherhood. However, the couple goes through a number of potentially stressing events during the reproductive period, and both mothers and fathers are at risk of developing peripartum depression...
January 2, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/27869771/selenium-nanoparticles-attenuate-oxidative-stress-and-testicular-damage-in-streptozotocin-induced-diabetic-rats
#7
Mohamed A Dkhil, Rafat Zrieq, Saleh Al-Quraishy, Ahmed E Abdel Moneim
We investigated the protective and antioxidative effects of selenium nanoparticles (SeNPs) in streptozotocin STZ-induced diabetic rats. STZ-diabetic rats were exposed daily to treatments with SeNPs and/or insulin and then the effect of these treatments on the parameters correlated to oxidative damage of the rat testes were assessed. Biochemical analysis revealed that SeNPs are able to ameliorate the reduction in the serum testosterone caused by STZ-induced diabetes. Furthermore, SeNPs could significantly decrease testicular tissue oxidative stress markers, namely lipid peroxidation and nitric oxide...
November 19, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27866977/the-anti-hyperplasia-anti-oxidative-and-anti-inflammatory-properties-of-qing-ye-dan-and-swertiamarin-in-testosterone-induced-benign-prostatic-hyperplasia-in-rats
#8
Xinying Wu, Ye Gu, Lun Li
Qing Ye Dan (QYD) is the whole plant of Swertia mileensis and used in Chinese folk medicine for the treatment of prostatitis, benign prostatic hyperplasia (BPH) and so on. This study was to investigate the effects of QYD and its main component swertiamarin on BPH induced by testosterone in rats. The prostatic expressions of vascular endothelial growth factor (VEGF), epidermal growth factor (EGF), basic fibroblast growth factor (βFGF) and proliferating cell nuclear antigen (PCNA) were detected by immunohistochemistry assay...
November 17, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27865415/biosterilant-effects-of-bacillus-thuringiensis-kurstaki-hd-73-extract-on-male-wistar-albino-rats
#9
Vikas Kumar Roy, Vanlal Peki, Maibam Sunita Devi, Sanasam Sanjeev, Maurya Khusboo, R Zothansanga, Kalibulla Syed Ibrahim, Nachimuthu Senthil Kumar, Guruswami Gurusubramanian
Chemosterilants have long been used in sterilization programs for managing pet, stray, and wild animals but adverse effects such as trauma, incomplete responses to treatment, and complete abolition of gonadal sources of testosterone often occurs. This study describes the biosterilant effects of administering three doses of Bacillus thuringiensis kurstaki HD-73 (Bt 5, 50, and 250 mg/kg; 20 rats/dose) extract in adult male Wistar albino rats on testicular parameters, function, histology, and a number of biochemical markers of overall health, free radical production, and cell proliferation...
January 15, 2017: Theriogenology
https://www.readbyqxmd.com/read/27856715/highlighted-topics-recovery-from-exercise-recovery-responses-of-testosterone-growth-hormone-and-igf-1-after-resistance-exercise
#10
William J Kraemer, Nicholas A Ratamess, Bradley J Nindl
The complexity of the endocrine pathways during recovery related to anabolic function belie an over simplistic approach to its study. This review is to examines the role of resistance exercise (RE) on the recovery responses of three major anabolic hormones testosterone, growth hormone(s) and insulin-like growth factor-I. Each hormone has a complexity related to differential pathways of action as well as interactions with binding proteins and receptor interactions. Testosterone is the primary anabolic hormone and its concentration changes during the recovery period depending upon the up- or down-regulation of the androgen receptor...
November 17, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27852943/co-adjustment-of-yolk-antioxidants-and-androgens-in-birds
#11
Mathieu Giraudeau, Simon Ducatez
Mothers can shape the developmental trajectory of their offspring through the transmission of resources such as hormones, antioxidants or immunoglobulins. Over the last two decades, an abundant literature on maternal effects in birds has shown that several of these compounds (i.e. androgens, glucocorticoids and antioxidants) often influence the same offspring phenotypic traits (i.e. growth, immunity or oxidative stress levels), making interaction effects between egg components a likely scenario. However, the potential interactive effects of maternally transmitted compounds on offspring development and potential co-adjustment of these compounds within an egg are still poorly understood...
November 2016: Biology Letters
https://www.readbyqxmd.com/read/27833807/the-ecology-of-stress-linking-life-history-traits-with-physiological-control-mechanisms-in-free-living-guanacos
#12
Ramiro J A Ovejero Aguilar, Graciela A Jahn, Mauricio Soto-Gamboa, Andrés J Novaro, Pablo Carmanchahi
BACKGROUND: Providing the context for the evolution of life-history traits, habitat features constrain successful ecological and physiological strategies. In vertebrates, a key response to life's challenges is the activation of the Stress (HPA) and Gonadal (HPG) axes. Much of the interest in stress ecology is motivated by the desire to understand the physiological mechanisms in which the environment affects fitness. As reported in the literature, several intrinsic and extrinsic factors affect variability in hormone levels...
2016: PeerJ
https://www.readbyqxmd.com/read/27833242/socioecological-predictors-of-immune-defences-in-wild-spotted-hyenas
#13
Andrew S Flies, Linda S Mansfield, Emily J Flies, Chris K Grant, Kay E Holekamp
Social rank can profoundly affect many aspects of mammalian reproduction and stress physiology, but little is known about how immune function is affected by rank and other socio-ecological factors in free-living animals.In this study we examine the effects of sex, social rank, and reproductive status on immune function in long-lived carnivores that are routinely exposed to a plethora of pathogens, yet rarely show signs of disease.Here we show that two types of immune defenses, complement-mediated bacterial killing capacity (BKC) and total IgM, are positively correlated with social rank in wild hyenas, but that a third type, total IgG, does not vary with rank...
September 2016: Functional Ecology
https://www.readbyqxmd.com/read/27832966/nonylphenol-induced-apoptosis-and-autophagy-involving-the-akt-mtor-pathway-in-prepubertal-sprague-dawley-male-rats-in-vivo-and-in-vitro
#14
Wenting Huang, Chao Quan, Peng Duan, Sha Tang, Wei Chen, Kedi Yang
This research explores the detrimental effect of nonylphenol (NP) to prepubertal Sprague-Dawley male rats in vivo and in vitro. Herein, forty-two 3-week-old rats were randomly divided into six groups, which were treated with NP (0, NAC, 25, 50, 100, 100+NACmg/kg/2d for 30 consecutive days) by intraperitoneal injection. NP induced a reduction in testosterone (15.58%, 17.23%, 13.38% in 25, 50, 100mg/kg group, respectively), triggered apoptosis related to oxidative stress, and disturbed mRNA and/or protein levels of PI3K, PTEN, PDK1, p-Akt, p-mTOR, p70S6K, caspase-3, LC3B...
December 12, 2016: Toxicology
https://www.readbyqxmd.com/read/27818221/endocrine-reproductive-immune-interactions-in-female-and-male-gal%C3%A3-pagos-marine-iguanas
#15
Lorin A Neuman-Lee, Susannah S French
Endocrine-immune interactions are variable across species and contexts making it difficult to discern consistent patterns. There is a paucity of data in non-model systems making these relationships even more nebulous, particularly in reptiles. In the present study, we have completed a more comprehensive test of the relationship among steroid hormones and ecologically relevant immune measures. We tested the relationship between baseline and stress-induced levels of sex and adrenal steroid hormones and standard ecoimmunological metrics in both female and male Galápagos marine iguanas (Amblyrhynchus cristatus)...
November 3, 2016: Hormones and Behavior
https://www.readbyqxmd.com/read/27815372/female-mice-with-an-xy-sex-chromosome-complement-develop-severe-angiotensin-ii-induced-abdominal-aortic-aneurysms
#16
Yasir Alsiraj, Sean E Thatcher, Richard Charnigo, Chen Kuey, Eric Blalock, Alan Daugherty, Lisa A Cassis
BACKGROUND: -Abdominal aortic aneurysms (AAAs) are a deadly pathology with strong sexual dimorphism. Similar to humans, female mice exhibit far lower incidences of angiotensin II (AngII)-induced AAAs than males. In addition to sex hormones, the X and Y sex chromosomes, and their unique complements of genes, may contribute to sexually dimorphic AAA pathology. Here, we defined the effect of female (XX) versus male (XY) sex chromosome complement on AngII-induced AAA formation and rupture in phenotypically female mice...
November 4, 2016: Circulation
https://www.readbyqxmd.com/read/27815128/preliminary-evidence-that-acute-stress-moderates-basal-testosterone-s-association-with-retaliatory-behavior
#17
Smrithi Prasad, Jayanth Narayanan, Vivien K G Lim, Gerald C H Koh, David S Q Koh, Pranjal H Mehta
A CONTRIBUTION TO A SPECIAL ISSUE ON HORMONES AND HUMAN COMPETITION: Testosterone is theorized to increase retaliation after social provocation. However, empirical evidence in support of these theories is mixed. The present research investigated whether acute stress causally suppresses testosterone's association with retaliation. We also explored sex differences in behavioral responses to acute stress. Thirty-nine participants (51.28% male) were randomly assigned to a high- or low-stress condition. Then participants engaged in 20 one-shot rounds of the ultimatum game, which was used to assess retaliatory behavioral responses to unfair treatment...
November 1, 2016: Hormones and Behavior
https://www.readbyqxmd.com/read/27815112/induction-of-heme-oxygenase-1-with-hemin-alleviates-cisplatin-induced-reproductive-toxicity-in-male-rats-and-enhances-its-cytotoxicity-in-prostate-cancer-cell-line
#18
Gehan Hussein Heeba, Alaaeldin Ahmed Hamza, Soha Osama Hassanin
Cisplatin-induced testicular damage is a major obstacle in the application of cisplatin as chemotherapeutic agent. However, it remains as one of the most widely employed anticancer agents in treating various solid tumors including prostate cancer. Since heme-oxygenase-1 (HO-1) is a cytoprotective enzyme with anti-oxidative stress, anti-inflammatory and anticancer activities, we investigated the effects of up-regulation of HO-1 by hemin and its inhibition by zinc protoporphyrin-IX (ZnPP) on cisplatin-induced testicular toxicity in adult rats...
November 1, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27785836/effect-of-rutin-on-diabetic-induced-erectile-dysfunction-possible-involvement-of-testicular-biomarkers-in-male-rats
#19
A S Al-Roujeaie, H M Abuohashish, M M Ahmed, O A Alkhamees
The present study aimed to investigate effects of rutin on diabetic-induced impairments of sexual behaviour, spermatogenesis and oxidative testicular damage. Diabetes was induced by a single injection of STZ (65 mg/kg) in male adult Wistar rats. Two weeks later, rutin (50 and 100 mg kg(-1)  day(-1) ) was treated to normal and diabetic rats for 5 weeks. Sexual behaviour of the animals was observed by taking stimulus females. At the end of the study, sperm count, motility and viability were recorded. Serum levels of glucose, inflammatory markers and testosterone were also estimated...
October 26, 2016: Andrologia
https://www.readbyqxmd.com/read/27785334/modulatory-influence-of-parkia-biglobosa-protein-isolate-on-testosterone-and-biomarkers-of-oxidative-stress-in-brain-and-testes-of-streptozotocin-induced-diabetic-male-rats
#20
Bolajoko Idiat Ogunyinka, Babatunji Emmanuel Oyinloye, Foluso Oluwagbemiga Osunsanmi, Andrew Rowland Opoku, Abidemi Paul Kappo
Parkia biglobosa seed an important household spice commonly consumed in Nigeria is believed to possess antioxidant activity that may exert modulatory effects in diabetes and diabetic complications. This study investigated the modulatory potential of Parkia biglobosa protein isolate (PBPi) on serum testosterone (sTT) level as well as its influence on biomarkers of oxidative stress in brain and testes of streptozotocin-induced diabetic male rats. Animals were made diabetic by single intraperitoneal administration of streptozotocin (STZ; 60 mg/kg body weight)...
2016: International Journal of Physiology, Pathophysiology and Pharmacology
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