Effects of photoperiod on pituitary levels of three forms of GnRH and reproductive hormones in the male European sea bass (Dicentrarchus labrax, L.) during testicular differentiation and first testicular recrudescence

Smooth Muscle Precursor Cells Derived from Human Pluripotent Stem Cells for Treatment of Stress Urinary Incontinence

“…It is thought that the internal urethral sphincter, which consists of SMCs, is an important contributor to urinary continence. Weakening of this area due to injury or loss of cells from aging is associated with moderate to severe incontinence [34][35][36]. Current therapies do not address restoration of SMCs in the urethral sphincter.…”

Effect of Combining Different Photoperiod Regimes on the Sexual Maturation of Male Sea Bass (Dicentrarchus labrax L.) During the First Two Years of Life

“…Although precocious males are larger in size and have higher gonadosomatic index (GSI) values during their first year of life, they show a reduced body size with respect to their counterparts over their second year of life [11,12]. The effect of photoperiod on sexual maturation, somatic growth and hormonal aspects has been studied in this species for more than three decades now [7,11,[13][14][15][16][17][18][19][20][21]. Recently, the analysis of the effect of discrete windows of continuous light (LL, 24 h light/day) on sexual maturation has shown that LL regimes reduce precocious gonadal maturation in juvenile male sea bass during their first year of life [5,11,19,20,21].…”

“…Interestingly, it has been confirmed that including the month of September in the LL this time interval is crucial for reducing precocious gametogenesis in male sea bass, as this is considered to be the most sensitive photolabile period in this species [21]. Furthermore, it is known that administration of a constant long photoperiod (LP) (15L:9D; light: darkness) delays the onset of puberty in sea bass [9,15,17,18]. Consequently, the combination of different photoperiods might be a useful environmental strategy to control gonadal development in fish.…”

“…The effect of LL at this time is completely unknown, although it is a very important aspect to be considered for the environmental control of reproduction and for assessing the likely existence of an endogenous reproductive component. The second aim was to monitor gonadal growth during the first two annual cycles of life in male groups kept under different combinations of photoperiod regimes to determine their capacity to reduce the rates of precocity at year one exposure to LL [11,20,21] and delay the onset of puberty at year two exposure to LP [14,15,17,18]. To that end, three independent trials were set up to explore, under laboratory conditions, the effect of day length and natural conditions of temperature on growth performance, gonadal size and the rates of running males up to the age at which fish reach a commercial size (450-500 g) and are harvested.…”

Novel galanin receptors in teleost fish: Identification, expression and regulation by sex steroids

“…21 Nevertheless, we did find a significant stimulatory effect of 11KT on dlGALR1a and dlGALR1b gene 22 transcription in the testis. In sea bass males, the levels of T and 11KT in the plasma are very low 23 during the first year of development (Rodrıguez et al 2000) and at the onset of gametogenesis the 24 levels of 11KT are elevated to support the initiation of spermiogenesis and testicular maturation 25 (Rodrıguez et al 2004). In the present study, the levels of 11KT in the plasma of control fish are Selvais et al 1995).…”