Psora-4, a Kv1.3 Blocker, Enhances Differentiation and Maturation in Neural Progenitor Cells

Aim: The self-repair ability of neural progenitor cells (NPCs) has been found to be activated and protected in several therapies helpful in multiple sclerosis (MS), an inflammatory demyelinating disease of the CNS. As a potential therapeutic target in MS, the role of the ion channel Kv1.3 in NPC self-repair has received limited attention. The aim of this study was to explore the effects of a selective Kv1.3 blocker on NPC neuronal differentiation and maturation. Methods: A small-molecule selective blocker for Kv1.3, Psora-4, was added to the differentiation medium of cultured mouse NPCs to assess its effect on NPC differentiation efficiency. Both a polypeptide Kv1.3 blocker and Kv1.3-specific RNA interference were used in parallel experiments. Further, the maturity of newborn neurons in the presence of Psora-4 was measured both by morphological analysis and by whole-cell patch clamping. Results: Psora-4 induced a significant increase in the percentage of neurons. Knockdown of Kv1.3 in NPCs also promoted neuronal differentiation. Both morphological and electro-physiological analyses suggested that NPC-derived neurons in the presence of Psora-4 were more mature. Conclusion: Our studies reveal a crucial role for the ion channel Kv1.3 in the regulation of NPC differentiation and maturation, making Psora-4 a promising candidate molecule for MS treatment.