title: Characterization and relative abundance of maxi-chloride channels in Epstein-Barr virus (EBV) producer: B95-8 cells.
abstract: Several Epstein-Barr virus (EBV)-transformed cell lines were used to investigate the pathogenesis of lymphoproliferative diseases and nasopharyngeal carcinoma. The studies focus on the events occurring inside the membrane. On only one occasion, the cell membrane of EBV-transformed B lymphocytes from a cystic fibrosis patient was found to express defective Cl channels (CFTR; Cystic Fibrosis Transmembrane conductance Regulator), as in the airway epithelial cell. No other type of channel in EBV-transformed cells has so far been investigated. In this study, the cell membrane of the B95-8 cell was examined by the patch-clamp technique and compared to the non-EBV-infected BJAB cell. The high conductance (approximately 300 pS) maxi-chloride (Cl) channel activity was the most frequently observed event in inside-out configurations. Under similar experimental conditions, we have found a significantly higher probability of detecting maxi-Cl channel activity on the cell membrane of B95-8 cells (69%) than on BJAB cells (27%), or as previously reported on resting murine B lymphocytes (38%) or intact human T lymphocytes (37%). The relative abundance of the maxi-Cl channel on B95-8 cells may be linked to EBV infection and/or secretory ability.
authors.affiliation: Department of Otolaryngology, College of Medicine, National Taiwan University, Taipei.
authors.forename: T H
authors.initials: TH
authors.lastname: Yeh
authors.forename: M C
authors.initials: MC
authors.lastname: Tsai
authors.forename: S Y
authors.initials: SY
authors.lastname: Lee
authors.forename: M M
authors.initials: MM
authors.lastname: Hsu
mesh_terms: D017878:4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid / Q000494:pharmacology; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid / Q000494:pharmacology; D000838:Anions / Q000494:pharmacology; D001402:B-Lymphocytes / Q000378:metabolism* / Q000648:ultrastructure / Q000821:virology*; D002461:Cell Line, Transformed; D018118:Chloride Channels / Q000037:antagonists & inhibitors / Q000378:metabolism*; D019005:Cystic Fibrosis Transmembrane Conductance Regulator / Q000378:metabolism; D004854:Herpesvirus 4, Human / Q000502:physiology*; D006801:Humans; D015640:Ion Channel Gating; D008564:Membrane Potentials; D008854:Microscopy, Electron; D009532:Nickel / Q000494:pharmacology; D018408:Patch-Clamp Techniques; D012965:Sodium Chloride / Q000494:pharmacology; D015032:Zinc / Q000494:pharmacology
chemical_list: D000838:Anions; C505032:CFTR protein, human; D018118:Chloride Channels; D019005:Cystic Fibrosis Transmembrane Conductance Regulator; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid; D012965:Sodium Chloride; D009532:Nickel; D015032:Zinc; D017878:4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid