title: Essential role of NKCC1 in NGF-induced neurite outgrowth.
abstract: The Na(+)/K(+)/2Cl(-) cotransporter (NKCC) mediates electroneutral transport of 2Cl(-) coupled with Na(+) and K(+) across the plasma membrane, and plays crucial roles in Cl(-) uptake into the cells, homeostasis of cellular Cl(-), and cell volume regulation. However, we have very limited information on the roles of ion transporters in neurite outgrowth in neuronal cells. In the present study, we report the role of NKCC1 (an isoform of NKCC) in NGF-induced neurite outgrowth of rat pheochromocytoma PC12D cells. The expression level of NKCC1 protein was increased by NGF treatment. Knock-down of NKCC1 by RNA interference (RNAi) drastically diminished the NGF-induced neurite outgrowth. Transfection of enhanced green fluorescent protein (EGFP)-tagged rat NKCC1 into cells for clarification of intracellular localization of NKCC1 revealed that the EGFP-rNKCC1 was mainly localized in the plasma membrane at growth cone during neurite outgrowth. These observations suggest that NKCC1 plays a fundamental role in NGF-induced neurite outgrowth of PC12D cells.
authors.affiliation: Department of Molecular Cell Physiology, Graduate School of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan.
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Nakajima
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Miyazaki
authors.forename: Naomi
authors.initials: N
authors.lastname: Niisato
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Marunaka
mesh_terms: D000818:Animals; D005786:Gene Expression Regulation; D020932:Nerve Growth Factor / Q000494:pharmacology*; D016501:Neurites / Q000187:drug effects* / Q000378:metabolism*; D016716:PC12 Cells; D034741:RNA, Small Interfering / Q000235:genetics; D051381:Rats; D028021:Sodium-Potassium-Chloride Symporters / Q000235:genetics / Q000378:metabolism*; D064506:Solute Carrier Family 12, Member 2
chemical_list: D034741:RNA, Small Interfering; C578879:Slc12a2 protein, rat; D028021:Sodium-Potassium-Chloride Symporters; D064506:Solute Carrier Family 12, Member 2; D020932:Nerve Growth Factor