Potassium chloride cotransporters (KCCs) mediate electroneutrally-coupled transport of K(+) and Cl(-), and play crucial roles in various cell functions including regulation of cell volume and homeostasis of cellular Cl(-)content. Four isoforms of KCCs (KCC1, 2, 3, and 4) have been identified. KCC1 is ubiquitously expressed, whereas KCC2 is mainly expressed in neuronal cells of central nervous system. KCC3 is highly expressed in heart, skeletal muscle, kidney, lung and placenta. KCC4 is mainly expressed in epithelial cells. In this study, we investigated roles of KCCs in NGF-induced neurite outgrowth of rat pheochromocytoma PC12 cells. The most abundantly expressed isoform in PC12 cells was KCC1. Inhibition of KCCs using [(dihydronindenyl)oxy] alkanoic acid (DIOA), an inhibitor of KCCs, enhanced the NGF-induced neurite outgrowth of PC12 cells in a dose-dependent manner. Treatment of PC12 cells with NGF significantly decreased mRNA expression of KCC1, whereas other isoforms, KCC2-4, showed no changes in their mRNA expression in response to NGF treatment. Knockdown of KCC1 using small interfering RNA (siRNA) enhanced the NGF-induced neurite outgrowth. These results suggest that KCC1 negatively regulates the NGF-induced neurite outgrowth of PC12 cells.
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