Males and females are in conflict over parental care, as it would be favourable for one parent to shift labour to the other. Yolk hormones may offer a mechanism through which female birds could influence offspring traits in ways that increase the relative investment by the male. We studied the role of yolk androgens in mediating sexual conflict over parental care in the collared flycatcher (Fic...

Androgens are the male sex hormones responsible for development of the male reproductive system. Testosterone is the main androgen, however, other circulating androgens also exist; these are dehydroepiandrosterone, androstenedione and androstenediol. In some tissues, testosterone can be converted to dihydrotestosterone by action of 5┙-reductase. Testosterone is also found in females, but at muc...

BACKGROUND The impact of early postnatal androgen exposure on female laryngeal tissue may depend on certain characteristics of this exposure. We assessed the impact of the dose, duration, and timing of early androgen exposure on the vocal development of female subjects who had been treated for adrenocortical tumor (ACT) in childhood. METHODS The long-term effects of androgen exposure on the f...

Pattern hair loss can occur in both men and women, the underlying molecular mechanisms have been continuously studied recent years. Male androgenetic alopecia (M-AGA), also termed male pattern loss, is most common type of men. M-AGA considered an androgen-dependent trait with a background genetic predisposition. The interplay between non-genetic factors leads to phenotype follicular miniaturiza...

Prostate cancer (PCa) is the most prevalent in Nigerian male population, similar to other black populations. It postulated that exposure endogenous or environmental steroids prompts prostatic mediated changes via steroid receptors as well a decrease androgen/estrogen ratio and aging. Thereby contributing carcinogenesis disease progression. This study aimed determine plasma levels of testosteron...

We exposed groups of adult male green treefrogs, Hyla cinerea, to acoustic stimuli (natural chorus or random tones) for seven consecutive nights at three time points during their natural breeding season (May, July, and September) and assessed seasonal changes in plasma androgen levels and number of arginine vasotocin (AVT) immunoreactive cells in the brain over this time period. We also tested ...

A man's male hormones may ward off heart damage by helping vessels around the heart regenerate, suggest Sieveking and colleagues. Although studies have shown that estrogen helps regenerate blood vessels, both in the uterus after menstruation and around the heart after wear and tear, little is known about whether or not men make up for a lack of the female hormone. Some researchers have theorize...

Most of lung cancer patients are with disorder expressions of estrogenic and androgen as well as their receptors ER and AR. In this study, a mechanism is proposed by testing Testosterone (T) and Estradiol (E2) levels and to look into the expressions of ER and AR for male non-small cell lung cancer patients to clarify the influence of sex hormones and their receptors. [Life Science Journal. 2009...