Postnatal neuronal apoptosis in the cerebral cortex: physiological and pathophysiological mechanisms

Area of Science:

• Neuroscience
• Developmental Biology
• Cell Biology

Background:

• A significant wave of apoptosis occurs in the mammalian cerebral cortex during the first week of postnatal life.
• This process can lead to a substantial loss of neurons, up to 30% from birth to adulthood.

Purpose of the Study:

• To review recent advances in understanding the phenomenon of developmental apoptosis in the cerebral cortex.
• To explore the relationship between active neuronal network formation and selective neuronal apoptosis.
• To discuss the molecular mechanisms and pathophysiological implications of this apoptotic wave.

Main Methods:

• Literature review of phenomenological and molecular studies on postnatal cerebral cortex apoptosis.
• Analysis of the roles of insulin-like growth factor I (IGF-1) and Rho GTPases (RhoA, RhoB).
• Discussion of drug-induced and N-methyl-d-aspartate receptor (NMDAR) antagonist-induced apoptosis.

Main Results:

• A putative relationship is proposed between the formation of active neuronal networks and the elimination of non-participatory neurons.
• Molecular mechanisms involving IGF-1 and Rho GTPases are being elucidated.
• Certain drugs and NMDAR blockade can induce significant apoptosis during this critical developmental window.

Conclusions:

• Developmental apoptosis in the postnatal cerebral cortex is a complex process with emerging molecular explanations.
• Understanding these mechanisms is crucial, as external factors like drugs can disrupt normal apoptotic processes.
• Further research is needed to fully link molecular causes of developmental and pathophysiological apoptosis.