Regulation of the seasonal leptin and leptin receptor expression profile during early sexual maturation and feed restriction in male Atlantic salmon, Salmo salar L., parr

Two leptin genes and a leptin receptor gene of female chub mackerel (Scomber japonicus): Molecular cloning, tissue distribution and expression in different obesity indices and pubertal stages

“…To date, reports on the reproductive function of fish leptin are limited. In a recent study, expression levels of both hepatic lepa-1 and lepa-2 were significantly higher in post-pubertal male Atlantic salmon when compared with immature males (Trombley et al, 2014). Furthermore, in feed-restricted post-pubertal males, hepatic lepa-2 and testicular lepr expression levels were significantly higher than those in feed-restricted immature males (Trombley et al, 2014).…”

“…In a recent study, expression levels of both hepatic lepa-1 and lepa-2 were significantly higher in post-pubertal male Atlantic salmon when compared with immature males (Trombley et al, 2014). Furthermore, in feed-restricted post-pubertal males, hepatic lepa-2 and testicular lepr expression levels were significantly higher than those in feed-restricted immature males (Trombley et al, 2014). Hence, leptin may regulate pubertal onset in male Atlantic salmon; however, no differences in circulating leptin levels were found in this species (Trombley and Schmitz, 2013).…”

Appetite-Controlling Endocrine Systems in Teleosts

“…Available data on the relation between leptin and energy status in Atlantic salmon are still limited to those from food restriction studies or experiments using diets with different energy content (260, 290, 348, 349). Plasma leptin levels were not different between fish that were fed full or restricted (60%) rations for 10 months, although hepatic lepA2 expression was higher in the fed than in the fasted salmon (260).…”

“…In a shorter trial (7 weeks), feed-restricted fish had higher plasma leptin levels and elevated hepatic lep expression levels than controls fed to satiation (290), which is consistent with some of the previous studies on rainbow trout (293, 345). Restricted feeding during several months (April–September) in Atlantic salmon parr undergoing sexual maturation showed that fish with the highest fat stores had the lowest leptin levels (349). Similarly, fish on a high-energy diet had lower leptin levels than fish on a low energy diet with less adipose stores (348).…”

Molecular cloning, characterization and evolutionary analysis of leptin gene in Chinese giant salamander, Andrias davidianus

“…Significance was set at P < 0.05. effects in both mammals and non-mammalians [2,3,6,29,[32][33][34]. For example, leptins possess roles in food intake and energy metabolism in mammals [35,36], growth and reproduction in birds [3], growth and development of the hind limb in X. laevis [6], and food intake and reproduction in teleosts [37,38]. Generally, more diverse physiological roles have been characterized in teleosts in contrast to those found in mammals [39].…”