title: Cellular electrophysiological principles that modulate secretion from synovial fibroblasts.
abstract: Rheumatoid arthritis (RA) is a progressive disease that affects both pediatric and adult populations. The cellular basis for RA has been investigated extensively using animal models, human tissues and isolated cells in culture. However, many aspects of its aetiology and molecular mechanisms remain unknown. Some of the electrophysiological principles that regulate secretion of essential lubricants (hyaluronan and lubricin) and cytokines from synovial fibroblasts have been identified. Data sets describing the main types of ion channels that are expressed in human synovial fibroblast preparations have begun to provide important new insights into the interplay among: (i) ion fluxes, (ii) Ca2+release from the endoplasmic reticulum, (iii) intercellular coupling, and (iv) both transient and longer duration changes in synovial fibroblast membrane potential. A combination of this information, knowledge of similar patterns of responses in cells that regulate the immune system, and the availability of adult human synovial fibroblasts are likely to provide new pathophysiological insights.
authors.affiliation: Faculties of Kinesiology and Medicine, University of Calgary, Calgary, Canada, T2N 1N4.
authors.forename: R B
authors.initials: RB
authors.lastname: Clark
authors.affiliation: Faculties of Kinesiology and Engineering, University of Calgary, Calgary, Canada, T2N 1N4.
authors.forename: T A
authors.initials: TA
authors.lastname: Schmidt
authors.affiliation: Department of Bioengineering and Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT, USA.
authors.forename: F B
authors.initials: FB
authors.lastname: Sachse
authors.affiliation: Department of Medicine, University of California, San Diego, CA, USA.
authors.forename: D
authors.initials: D
authors.lastname: Boyle
authors.affiliation: Department of Medicine, University of California, San Diego, CA, USA.
authors.forename: G S
authors.initials: GS
authors.lastname: Firestein
authors.affiliation: Faculties of Kinesiology and Medicine, University of Calgary, Calgary, Canada, T2N 1N4.
authors.forename: W R
authors.initials: WR
authors.lastname: Giles
mesh_terms: D000818:Animals; D055724:Electrophysiological Phenomena; D005347:Fibroblasts / Q000502:physiology*; D006801:Humans; D007473:Ion Channels / Q000502:physiology; D013583:Synovial Membrane / Q000166:cytology
chemical_list: D007473:Ion Channels
keywords: Ca2+-activated K+ current; Em; IK-Ca; Intracellular calcium; [Ca2+]i; depolarization - secretion coupling; inward rectifier K+ currents; ion channels; patch clamp; resting potential; synovial fibroblasts