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Physiological Reviews, Vol. 80, No. 1, January 2000, pp. 31-81
Copyright ©2000 by the American Physiological Society
Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, Nevada
Hume, Joseph R.,
Dayue Duan,
Mei Lin Collier,
Jun Yamazaki, and
Burton Horowitz.
Anion Transport in Heart. Physiol. Rev. 80: 31-81, 2000.
Anion transport proteins in
mammalian cells participate in a wide variety of cell and intracellular
organelle functions, including regulation of electrical activity, pH,
volume, and the transport of osmolites and metabolites, and may even
play a role in the control of immunological responses, cell migration,
cell proliferation, and differentiation. Although significant progress
over the past decade has been achieved in understanding electrogenic
and electroneutral anion transport proteins in sarcolemmal and
intracellular membranes, information on the molecular nature and
physiological significance of many of these proteins, especially in the
heart, is incomplete. Functional and molecular studies presently
suggest that four primary types of sarcolemmal anion channels are
expressed in cardiac cells: channels regulated by protein kinase A
(PKA), protein kinase C, and purinergic receptors
(ICl.PKA); channels regulated by changes in cell
volume (ICl.vol); channels activated by
intracellular Ca2+ (ICl.Ca); and
inwardly rectifying anion channels (ICl.ir). In most animal species, ICl.PKA is due to
expression of a cardiac isoform of the epithelial cystic fibrosis
transmembrane conductance regulator Cl
channel. New
molecular candidates responsible for ICl.vol,
ICl.Ca, and ICl.ir
(ClC-3, CLCA1, and ClC-2, respectively) have recently been identified
and are presently being evaluated. Two isoforms of the band 3 anion
exchange protein, originally characterized in erythrocytes, are
responsible for Cl
/HCO3
exchange, and
at least two members of a large vertebrate family of electroneutral
cotransporters (ENCC1 and ENCC3) are responsible for
Na+-dependent Cl
cotransport in heart. A
223-amino acid protein in the outer mitochondrial membrane of most
eukaryotic cells comprises a voltage-dependent anion channel. The
molecular entities responsible for other types of electroneutral anion
exchange or Cl
conductances in intracellular membranes of
the sarcoplasmic reticulum or nucleus are unknown. Evidence of cardiac
expression of up to five additional members of the ClC gene family
suggest a rich new variety of molecular candidates that may underlie
existing or novel Cl
channel subtypes in sarcolemmal and
intracellular membranes. The application of modern molecular biological
and genetic approaches to the study of anion transport proteins during
the next decade holds exciting promise for eventually revealing the
actual physiological, pathophysiological, and clinical significance of
these unique transport processes in cardiac and other mammalian cells.
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