Maternal care associates with differences in morphological complexity in the medial preoptic area

Area of Science:

• Neuroscience
• Behavioral Biology
• Molecular Psychiatry

Background:

• The medial preoptic area (MPOA) is crucial for maternal behavior, including pup licking/grooming (LG).
• Cyclic adenosine monophosphate (cAMP) responsive element-binding protein (CREB) is a key transcription factor regulating gene expression.

Purpose of the Study:

• To investigate the relationship between CREB activity in the MPOA and maternal behavior in rats.
• To explore the role of CREB in regulating neuronal structure and gene expression related to maternal care.

Main Methods:

• Quantified phosphorylated CREB (pCREB) levels in the MPOA of lactating rats exhibiting high vs. low LG behaviors.
• Assessed neuronal dendritic complexity index (DCI) in the MPOA.
• Utilized MPOA neuronal cultures to examine CREB overexpression effects on dendritic complexity and gene expression (Rem2, BDNF).

Main Results:

• High-LG mothers showed increased MPOA pCREB levels and reduced dendritic complexity compared to low-LG mothers.
• CREB overexpression in MPOA cultures decreased dendritic complexity and increased Rem2 and BDNF expression.
• Rem2 expression was significantly elevated in the MPOA of high-LG lactating rats.

Conclusions:

• CREB activity in the MPOA is associated with maternal behavior intensity in rats.
• Reduced neuronal dendritic complexity in high-LG mothers may be mediated by CREB-induced Rem2 expression.
• This suggests a molecular mechanism linking CREB signaling in the MPOA to the neural basis of maternal care.