CD38 is critical for social behaviour by regulating oxytocin secretion

Area of Science:

• Neuroendocrinology
• Neurobiology
• Molecular Biology

Background:

• CD38 is a transmembrane glycoprotein with ADP-ribosyl cyclase activity.
• Its function within the neuroendocrine system remains largely uncharacterized.
• CD38 influences calcium (Ca2+) signaling pathways.

Purpose of the Study:

• To investigate the role of CD38 in the neuroendocrine system.
• To determine the impact of CD38 on maternal and social behaviors.
• To elucidate the molecular mechanisms underlying CD38's function in neuropeptide release.

Main Methods:

• Utilized CD38 knockout (CD38-/-) mice models.
• Measured plasma oxytocin (OT) and vasopressin levels.
• Administered OT replacement therapy (subcutaneous injection and lentiviral delivery).
• Assessed maternal nurturing and social behaviors.
• Examined depolarization-induced OT secretion and Ca2+ elevation in neurohypophysial axon terminals.

Main Results:

• CD38-/- mice exhibited significant deficits in maternal nurturing and social behavior.
• Oxytocin levels were markedly decreased in CD38-/- mice.
• OT replacement and hypothalamic CD38 restoration rescued behavioral impairments.
• Disrupted OT secretion and Ca2+ signaling in CD38-/- mice were observed.
• CD38 metabolite antagonists mimicked these disruptions in wild-type mice.

Conclusions:

• CD38 plays a critical role in neuropeptide release, particularly oxytocin.
• CD38 is essential for regulating maternal and social behaviors.
• Dysfunction of CD38 may be implicated in neurodevelopmental disorders.