Photoperiodic control of testicular growth, histomorphology and serum testosterone levels in the male Eurasian tree sparrow: Involvement of circadian rhythm

2014 ◽  
Vol 208 ◽  
pp. 5-11 ◽  
Author(s):  
Anand S. Dixit ◽  
Namram S. Singh
Keyword(s):  
Circadian Rhythm ◽  
Serum Testosterone ◽  
Tree Sparrow ◽  
Photoperiodic Control ◽  
Testosterone Levels ◽  
Testicular Growth ◽  
Eurasian Tree Sparrow

scholarly journals Circadian versus circannual rhythm in the photoperiodic programming of seasonal responses in Eurasian tree sparrow (Passer montanus)

2020 ◽  
Vol 19 (3) ◽  
pp. 371-381 ◽  
Author(s):  
Anand S. Dixit ◽  
Namram S. Singh
Keyword(s):  
Circadian Rhythm ◽  
Day Length ◽  
Circannual Rhythm ◽  
Tree Sparrow ◽  
Passer Montanus ◽  
Eurasian Tree Sparrow ◽  
Proximate Factor ◽  
Seasonal Responses

Experiments were done on the subtropical tree sparrow to examine whether day length, as a proximate factor, involves circadian rhythm in timing seasonal responses or these events are programmed by the mediation of endogenous circannual rhythm.

scholarly journals Photoperiodic control of GnRH-I expression in seasonal reproduction of the Eurasian tree sparrow

2018 ◽  
Vol 17 (7) ◽  
pp. 934-945 ◽  
Author(s):  
Anand S. Dixit ◽  
Sanborlang Byrsat
Keyword(s):  
Temporal Information ◽  
Day Length ◽  
Seasonal Reproduction ◽  
Tree Sparrow ◽  
Photoperiodic Control ◽  
Passer Montanus ◽  
Eurasian Tree Sparrow

Day length has been shown to be a major source of temporal information regulating seasonal reproduction in the Eurasian tree sparrow (Passer montanus).

Eurasian Tree Sparrow (Passer montanus)

2017 ◽  
Author(s):  
Jon C. Barlow ◽  
Sheridan N. Leckie ◽  
Peter Pyle ◽  
Michael A. Patten
Keyword(s):  
Tree Sparrow ◽  
Passer Montanus ◽  
Eurasian Tree Sparrow

Why Do We Need New Markers for Male Hypogonadism and How Seminal Proteomics Might Solve the Problem?

2020 ◽  
Vol 27 (12) ◽  
pp. 1186-1191
Author(s):  
Giuseppe Grande ◽  
Domenico Milardi ◽  
Silvia Baroni ◽  
Andrea Urbani ◽  
Alfredo Pontecorvi
Keyword(s):  
Serum Testosterone ◽  
Clinical Syndrome ◽  
Testosterone Replacement ◽  
Total Testosterone ◽  
Male Hypogonadism ◽  
Grey Zone ◽  
Testosterone Levels ◽  
Normal Number ◽  
Replacement Treatment

Male hypogonadism is “a clinical syndrome that results from failure of the testis to produce physiological concentrations of testosterone and/or a normal number of spermatozoa due to pathology at one or more levels of the hypothalamic– pituitary–testicular axis”. The diagnostic protocol of male hypogonadism includes accurate medical history, physical exam, as well as hormone assays and instrumental evaluation. Basal hormonal evaluation of serum testosterone, LH, and FSH is important in the evaluation of diseases of the hypothalamus-pituitary-testis axis. Total testosterone levels < 8 nmol/l profoundly suggest the diagnosis of hypogonadism. An inadequate androgen status is moreover possible if the total testosterone levels are 8-12 nmol/L. In this “grey zone” the diagnosis of hypogonadism is debated and the appropriateness for treating these patients with testosterone should be fostered by symptoms, although often non-specific. Up to now, no markers of androgen tissue action can be used in clinical practice. The identification of markers of androgens action might be useful in supporting diagnosis, Testosterone Replacement Treatment (TRT) and clinical follow-up. The aim of this review is to analyze the main findings of recent studies in the field of discovering putative diagnostic markers of male hypogonadism in seminal plasma by proteomic techniques. The identified proteins might represent a “molecular androtest” useful as a seminal fingerprint of male hypogonadism, for the diagnosis of patients with moderate grades of testosterone reduction and in the follow-up of testosterone replacement treatment.

scholarly journals Testosterone in Female Depression: A Meta-Analysis and Mendelian Randomization Study

Biomolecules ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 409
Author(s):  
Dhruba Tara Maharjan ◽  
Ali Alamdar Shah Syed ◽  
Guan Ning Lin ◽  
Weihai Ying
Keyword(s):  
Mendelian Randomization ◽  
Meta Analysis ◽  
Menopausal Status ◽  
Serum Testosterone ◽  
Serum Levels ◽  
Testosterone Levels ◽  
Mendelian Randomization Analysis ◽  
The Difference ◽  
Diagnostic Capabilities ◽  
Randomization Analysis

Testosterone’s role in female depression is not well understood, with studies reporting conflicting results. Here, we use meta-analytical and Mendelian randomization techniques to determine whether serum testosterone levels differ between depressed and healthy women and whether such a relationship is casual. Our meta-analysis shows a significant association between absolute serum testosterone levels and female depression, which remains true for the premenopausal group while achieving borderline significance in the postmenopausal group. The results from our Mendelian randomization analysis failed to show any causal relationship between testosterone and depression. Our results show that women with depression do indeed display significantly different serum levels of testosterone. However, the directions of the effect of this relationship are conflicting and may be due to menopausal status. Since our Mendelian randomization analysis was insignificant, the difference in testosterone levels between healthy and depressed women is most likely a manifestation of the disease itself. Further studies could be carried out to leverage this newfound insight into better diagnostic capabilities culminating in early intervention in female depression.

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