Novel regulators of rabbit reproductive functions

This is a review of original data concerning new extra- and intracellular regulators of rabbit ovarian functions. Effects of some hormones including leptin, ghrelin, oxytocin, arginine-vasotocin, endothelin (ET-1), gonadotropin releasing hormone (GnRH), adrenocorticotropic hormone (ACTH), growth factors such as insulin-like growth factor-I (IGF-I), epidermal growth factor (EGF), nuclear peroxisome proliferator-activated receptor gamma (PPARγ), pharmacological regulators of some protein kinases such as protein kinase A (PKA), mitogen-activated protein (MAP) kinase, cell division cycle protein 2 homolog (CDC2 kinase, CDK), tyrosine kinases), and plant molecules (resveratrol, rapamycin) on the functions of ovarian cells (proliferation, apoptosis, secretory activity, expression of some protein kinases) and reproductive end points (blood level of reproductive hormones, ovarian morphology, number of ovulations, embryo yield and quality, number and viability of offspring), and their possible interrelationships and practical application in rabbit breeding are reviewed.