ABSTRACT
Much is known about the endocrine hormonal mechanisms controlling ovarian development.
More recently, attention has focused on identifying regulatory pathways that, operating
within the ovarian microenvironment, contribute to the acquisition of ovarian reproductive
competence. Within this framework, the concept has developed that neurotrophins (NTs)
and their Trk tyrosine kinase receptors, long thought to be exclusively required for
the development of the nervous system, are also involved in the control of ovarian
maturation. The ovary of several species, including rodents, sheep, cows, nonhuman
primates, and humans, produce NTs and express both the high-affinity receptors and
the common p75NTR receptor required for signaling. Studies in humans and rodents have shown that this
expression is initiated during fetal life, before the formation of primordial follicles.
Gene targeting approaches have identified TrkB, the high-affinity receptor for neurotrophin-4/5
and brain-derived neurotrophic factor, as a signaling module required for follicular
assembly, early follicular growth, and oocyte survival. A similar approach has shown
that nerve growth factor contributes independently to the growth of primordial follicles
into gonadotropin-responsive structures. Altogether, these observations indicate that
NTs are important contributors to the gonadotropin-independent process underlying
the formation and initiation of ovarian follicular growth.
KEYWORDS
Neurotrophins - ovarian folliculogenesis - oocyte survival - early follicle growth
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Gregory A DissenPh.D.
Division of Neuroscience, Oregon National Primate Research Center
505 N.W. 185th Avenue, Beaverton, OR 97006-3448
Email: disseng@ohsu.edu