Connexin Regulation and Modulation of Neural Stem Cell Differentiation Induced by Cell-Permeable Itaconate

Area of Science:

• Neuroscience
• Stem Cell Biology
• Immunometabolism

Background:

• Neural stem cells (NSCs) are crucial for central nervous system (CNS) repair and regeneration.
• Intercellular communication via connexins (Cxs) is vital for CNS homeostasis and response coordination.
• Itaconate, an immunometabolite, modulates neuroinflammation and oxidative stress but its role in NSC communication is unknown.

Purpose of the Study:

• To investigate the effect of dimethyl itaconate on connexin expression in NSCs.
• To determine if itaconate influences NSC fate and differentiation.
• To explore the role of Cxs in itaconate-mediated NSC modulation.

Main Methods:

• Treatment of NSCs with dimethyl itaconate, a cell-permeable itaconate derivative.
• Analysis of connexin expression profiles in treated NSCs.
• Assessment of NSC differentiation using pharmacological inhibitors of Cxs (carbenoxolone, mefloquine).

Main Results:

• Dimethyl itaconate significantly modulated connexin expression in NSCs, notably increasing Cx36 levels.
• Itaconate treatment promoted NSC differentiation towards a neuronal phenotype.
• Inhibition of Cxs abolished the differentiation-promoting effects of dimethyl itaconate.

Conclusions:

• Cell-permeable itaconate regulates connexin expression in NSCs.
• Itaconate promotes NSC differentiation into neurons, mediated by connexin-based intercellular communication.
• Findings offer insights into CNS repair mechanisms and potential therapeutic strategies for CNS regeneration.