The Influence of Mating and Related Stimuli on Plasma Levels of Luteinizing Hormone, Follicle Stimulating Hormone, Prolactin, and Testosterone in the Male Rat¹

Angiotensin I converting enzyme in rat testis, epididymis and vas deferens under different conditions

“…This was further supported by the increase of ACE after mating which corresponds with increased serum testosterone levels (Herz, Folman & Drori, 1969;Purvis & Haynes, 1974;Dessi-Fulgheri, Lupo di Prisco & Verdarelli, 1975;Kamel, Wright, Mock & Frankel, 1977). Since the increase of ACE activity within the tissue specimens of the epididymis was comparably small at the onset of puberty and failed to occur after mating one might assume a simultaneous endocrine control of ACE inhibitor synthesis and secretion as it is known for other secretion products of the epididymis (Brooks, 1977;Wong & Yeung, 1978;Schenck, 1980).…”

Functional significance of the rapid regulation of brain estrogen action: Where do the estrogens come from?

“…For instance, plasma testosterone levels may be acutely altered in males by the presentation of a female and/or copulation (mice: [32,150]; rat: [128,200]; Rabbit: [107,111,220]; Hamster : [129]; marmoset : [292]; macaques: [53]; Birds: [281]). The fastest effects reported occurred within 5-15 min (in rat: [200]; in mouse: [32]; in rabbit: [220]).…”

“…The fastest effects reported occurred within 5-15 min (in rat: [200]; in mouse: [32]; in rabbit: [220]). A release of pituitary hormones in response to some of these stimuli has also been shown to precede the testosterone release [62, 92,111,125,128,129]. The nature of the stimulus eliciting these responses has been questioned.…”

“…Some studies based on repeated exposures to female odors or repeated mating suggested that mating per se was necessary [255], while other experiments indicated that the smell or sight of an estrus female or a pre-copulatory interaction with an estrus female were sufficient to increase plasma hormone levels [32,62,151,200,220,292]. It has also been suggested that these effects may be purely social, and not sexual, given that a similar increase of hormone concentrations could be evoked by exposure to a non-receptive female [97,125,129,150]. Interestingly, in male rats, LH and testosterone secretion can be conditioned so that after learning they are rapidly induced by a neutral stimulus previously associated with mating [100] or by the arena where males were previously mated [128].…”

Estudo neuroquímico do núcleo pré-mamilar ventral nos animais submissos durante os encontros agonísticos sociais.

“…Nesses casos foram observados que os animais lesados não cessavam os ataques aos intrusos após a exposição, como ocorre em animais intactos. Esses dados sugerem uma participação importante desse núcleo na modulação da agressividade ( VAN DEN BERG et al, 1983 (MACRIDES et al,1975;KAMEL et al, 1977;PURVIS et al, 1978;FLANNEELLY et al, 1982;GOYENS et al, 1975). Estas informações da fêmea ainda influenciam a expressão de CART no PMv, indicando que este neuropeptídeo está relacionado com o comportamento sexual (CAVALCANTE et al, 2006).…”