title: The nuclear chloride ion channel NCC27 is involved in regulation of the cell cycle.
abstract: NCC27 is a nuclear chloride ion channel, identified in the PMA-activated U937 human monocyte cell line. NCC27 mRNA is expressed in virtually all cells and tissues and the gene encoding NCC27 is also highly conserved. Because of these factors, we have examined the hypothesis that NCC27 is involved in cell cycle regulation. Electrophysiological studies in Chinese hamster ovary (CHO-K1) cells indicated that NCC27 chloride conductance varied according to the stage of the cell cycle, being expressed only on the plasma membrane of cells in G2/M phase. We also demonstrate that Cl- ion channel blockers known to block NCC27 led to arrest of CHO-K1 cells in the G2/M stage of the cell cycle, the same stage at which this ion channel is selectively expressed on the plasma membrane. These data strongly support the hypothesis that NCC27 is involved, in some as yet undetermined manner, in regulation of the cell cycle.
authors.affiliation: Centre for Immunology, St Vincent's Hospital and The University of New South Wales, Sydney, NSW, Australia. stella@unsw.edu.au
authors.forename: S M
authors.initials: SM
authors.lastname: Valenzuela
authors.forename: M
authors.initials: M
authors.lastname: Mazzanti
authors.forename: R
authors.initials: R
authors.lastname: Tonini
authors.forename: M R
authors.initials: MR
authors.lastname: Qiu
authors.forename: K
authors.initials: K
authors.lastname: Warton
authors.forename: E A
authors.initials: EA
authors.lastname: Musgrove
authors.forename: T J
authors.initials: TJ
authors.lastname: Campbell
authors.forename: S N
authors.initials: SN
authors.lastname: Breit
mesh_terms: D000818:Animals; D000873:Anthracenes / Q000494:pharmacology; D016466:CHO Cells; D002453:Cell Cycle / Q000502:physiology*; D002462:Cell Membrane / Q000378:metabolism; D048429:Cell Size / Q000502:physiology; D018118:Chloride Channels / Q000235:genetics / Q000502:physiology*; D002712:Chlorides / Q000502:physiology; D017124:Conserved Sequence / Q000235:genetics; D006224:Cricetinae; D004553:Electric Conductivity; D004594:Electrophysiology; D016195:G2 Phase; D015870:Gene Expression; D006016:Glycolates / Q000494:pharmacology; D007425:Intracellular Membranes / Q000378:metabolism; D007473:Ion Channels / Q000235:genetics / Q000378:metabolism; D008938:Mitosis; D005810:Multigene Family; D014162:Transfection
chemical_list: D000873:Anthracenes; C501966:CLIC1 protein, human; D018118:Chloride Channels; D002712:Chlorides; D006016:Glycolates; D007473:Ion Channels; C015765:MK 473; C010030:9-anthroic acid