Testosterone rapidly increases ejaculate volume and sperm density in competitively breeding goldfish through an estrogenic membrane receptor mechanism

Male fidelity expressed through rapid testosterone suppression of ultrasonic vocalizations to novel females in the monogamous California mouse

“…The precise mechanism through which T is acting cannot be determined in the present study, but recent research has identified intriguing rapid effects of steroid hormones achieved by non-genomic mechanisms (Cornil et al, 2013;Mangiamele and Thompson, 2012), including effects on acoustic communication (RemageHealey and Bass, 2010;Remage-Healey and Joshi, 2012). Aromatase conversion of the precursor T to estradiol has been identified as a key process in rapid modulation of vocal behavior (Schlinger et al, 1999), which is interesting considering that aromatase expression in the medial preoptic area (mPOA), a nucleus with known involvement in both sexual and parental behavior (Dominguez and Hull, 2005;Kentner et al, 2010), increases in response to fatherhood in male California mice (Trainor et al, 2003).…”

“…5 Although most studies of T and mating effort have examined long-term changes in baseline T, recent attention has been given to the dynamic changes in T and other steroid hormones on sexual behavior on smaller time scales that can induce rapid changes in behavior, particularly in response to dynamic social conditions (Cross and Roselli, 1999;Mangiamele and Thompson, 2012;Remage-Healey and Bass, 2010;Remage-Healey, 2012). In rodents, like other mammals, transient increases (henceforth "pulses") of T have been widely observed among males in response to encounters with females (Batty, 1978;Coquelin and Bronson, 1980;James et al, 2006;Macrides et al, 1975;Nyby, 2008;reviewed by Gleason et al, 2009), but the consequences of these T pulses are not well understood, and even less so regarding extra-pair mating in monogamous species.…”

Effects of re-stripping on the seminal characteristics of pacu ( Piaractus mesopotamicus ) during the breeding season

“…For instance, in Clarias gariepinus males (Nyina-wamwiza et al, 2012), a positive association of higher androgens levels and lower estrogen levels with good-quality sperm has been observed. In addition, in Carassius auratus, T rapidly increases ejaculate volume and sperm density via an aromatase-dependent mechanism, through the activation of estrogen receptors a and b (Mangiamele and Thompson, 2012). Moreover, in A. regius, the highest values of % motility and motility duration were recorded in the middle of the spawning period, concomitantly with a peak in the 11-KT plasma level (Schiavone et al, 2012).…”

“…Among steroid hormones, 11-ketotestosterone (11-KT) is the primary hormone that is secreted in response to GtHs in males (Nagahama and Yamashita, 2008;Mylonas et al, 2010;Schulz et al, 2010). Other steroid hormones with lesser-known functions, such as estradiol (E 2 ) and testosterone (T), are involved in the renewal and proliferation of spermatogonia (Miura and Miura, 2001;Kobayashi et al, 2011) and regulate sperm output (Mangiamele and Thompson, 2012).…”

Rapid control of male typical behaviors by brain-derived estrogens

“…This effect is mimicked by E 2 within 10 min and blocked by an aromatase inhibitor administered along with testosterone thus indicating that the behavioral effect of testosterone requires its aromatization. In the same species, testosterone has recently been shown to rapidly increase through aromatization milt volume and sperm concentration [159]. …”