Steroid hormones and maternal experience interact to induce glial plasticity in the cingulate cortex

Area of Science:

• Neuroscience
• Reproductive Biology

Background:

• Neocortical plasticity typically doesn't involve reproductive function changes.
• Postpartum rats show increased astrocytes with glial fibrillary acidic protein (GFAP) and basic fibroblast growth factor (FGF-2) in the cingulate cortex area 2 (Cg2).

Purpose of the Study:

• To investigate the stimuli necessary and sufficient for astrocytic changes in the Cg2.
• To understand the interaction between maternal experience and hormonal state in inducing these brain changes.

Main Methods:

• Virgin rats received 3 hours of maternal experience combined with hormonal treatment mimicking late pregnancy.
• Sensitized virgin rats underwent 3 hours of maternal behavior without hormonal treatment.
• Early maternal experience was eliminated by removing pups postpartum.

Main Results:

• Combined maternal experience and hormonal treatment induced astrocytic changes in Cg2 of virgin rats, similar to postpartum females.
• Maternal experience alone for 3 hours did not cause astrocytic changes in sensitized virgin rats.
• Eliminating early maternal experience postpartum abolished increased GFAP and FGF-2 protein expression in the cingulate cortex.

Conclusions:

• Maternal experience and hormonal state interact to drive astrocytic remodeling in the Cg2.
• The cingulate cortex plays a role in maternal responsivity, supported by these findings.