RFamide-Related Peptide Neurons Modulate Reproductive Function and Stress Responses

Area of Science:

• Neuroendocrinology
• Reproductive Biology
• Stress Physiology

Background:

• RF-amide related peptide 3 (RFRP-3) is a neuropeptide implicated in the central regulation of fertility.
• The precise role of RFRP neurons in reproductive and stress axes remains incompletely understood.

Purpose of the Study:

• To investigate the physiological roles of RFRP neurons in regulating puberty onset, fertility, and stress responses.
• To elucidate the sex-specific involvement of RFRP neurons in stress-induced reproductive suppression.

Main Methods:

• Development and validation of a novel RFRP-Cre mouse line.
• Utilized Cre-dependent neuronal ablation and DREADD technology to manipulate RFRP neuronal activity (ablation, stimulation, inhibition).
• Assessed effects on puberty onset, reproductive cycling, fertility, and luteinizing hormone secretion under stress paradigms (restraint, glucocorticoid).

Main Results:

• Chronic activation of RFRP neurons delayed puberty onset and reproductive cycling but did not impair fertility.
• RFRP neurons play a critical sex-specific role in mediating stress-induced reproductive suppression; ablation/silencing prevented this suppression in females.
• RFRP neuronal activation stimulated glucocorticoid secretion, indicating a feedback loop within the stress axis.

Conclusions:

• RFRP neurons serve as a crucial neuronal link between the stress and reproductive axes.
• RFRP neurons are key mediators of stress-induced reproductive suppression, particularly in females.
• RFRP neuronal activity influences both reproductive timing and the hypothalamic-pituitary-adrenal (HPA) axis response to stress.