Hormonal Regulation of Ovarian Function in Reptiles

Sex steroid receptors in the ovarian follicles of the lizard Sceloporus torquatus

“…In reptiles, both isoforms have been reported and are associated with the stage of the reproductive cycle (Custodia-Lora and Callard, 2002;Biazik et al, 2012;Hammouche et al, 2012;Motta et al, 2020). During follicular development, PR could stimulate the proliferation in the germinal beds, recruitment, and transition to the primary oocyte (Custodia-Lora and Callard, 2002;Jones, 2011;Holding et al, 2014;Ramírez-Pinilla et al, 2015;Duarte-Méndez et al, 2018;Motta et al, 2020). As the follicular development progressed, we observed an increase in immunolabelling intensity.…”

“…In female lizards, E 2 promotes follicular development and the synthesis of vitellogenin (VTG) in the liver. This hormone increases with the onset of vitellogenesis and ovulation in various species (Jones, 2011;Ramírez-Pinilla et al, 2015;Barbosa-Moyano et al, 2020). The ovary is the principal source of E 2 to exert its multiple effects via receptors in different tissues (Contrò et al, 2015).…”

“…The principal source of P 4 is the corpus luteum (Hosie et al, 2003;Martínez-Torres et al, 2003. This progestogen shows low concentrations during follicular development, a peak before ovulation and the highest concentrations near oviposition or during embryo development (Jones, 2011;Ramírez-Pinilla et al, 2015;Barbosa-Moyano et al, 2020).…”