title: The Role of RFamide-Related Peptide-3 in Age-Related Reproductive Decline in Female Rats.
abstract: Reproductive senescence, the point in time when females cease to show estrous cyclicity, is associated with endocrine changes in the hypothalamus, pituitary, and gonads. However, the mechanisms triggering this transition are not well understood. To gain a better understanding of the top-down control of the transition from reproductive competence to a state of reproductive senescence, we investigated middle-aged female rats exhibiting varying degrees of reproductive decline, including individuals with normal cycles, irregular cycles, and complete cessation of cycles. We identified hormonal changes in the brain that manifest before ovarian cycles exhibit any deterioration. We found that females exhibit an increase in RFamide-related peptide-3 (RFRP3) mRNA expression in the hypothalamus in middle age prior to changes in estrous cycle length. This increase is transient and followed by subsequent decreases in kisspeptin (KiSS1) and gonadotropin-releasing hormone (GnRH) mRNA expression. Expression of RFRP3 and its receptor also increased locally in the ovaries with advancing age. While it is well known that aging is associated with decreased GnRH release and downstream disruption of the hypothalamic-pituitary-gonadal (HPG) axis, herein, we provide evidence that reproductive senescence is likely triggered by alterations in a network of regulatory neuropeptides upstream of the GnRH system.
authors.affiliation: Department of Integrative Biology, University of California Berkeley , Berkeley, CA , USA.
authors.forename: Anna C
authors.initials: AC
authors.lastname: Geraghty
authors.affiliation: Department of Integrative Biology, University of California Berkeley , Berkeley, CA , USA.
authors.forename: Sandra E
authors.initials: SE
authors.lastname: Muroy
authors.affiliation: Department of Psychology, University of California Berkeley, Berkeley, CA, USA; Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, USA.
authors.forename: Lance J
authors.initials: LJ
authors.lastname: Kriegsfeld
authors.affiliation: Department of Integrative Biology, University of California Berkeley, Berkeley, CA, USA; Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, USA.
authors.forename: George E
authors.initials: GE
authors.lastname: Bentley
authors.affiliation: Department of Integrative Biology, University of California Berkeley, Berkeley, CA, USA; Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, USA; Program in Child and Brain Development Toronto, Canadian Institute for Advanced Research (CIFAR), Toronto, ON, Canada.
authors.forename: Daniela
authors.initials: D
authors.lastname: Kaufer
keywords: GnIH; GnIH/RFRP3; RFRP3; aging; reproductive senescence