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Vol. 11, Issue 5, 1845-1858, May 2000


§
*Institut National de la Santé et de la Recherche
Médicale U-390, CHU Arnaud de Villeneuve, Montpellier,
34295 France; §Centre de Recherches de Biochimie
Macromoléculaire, Centre National de la Recherche Scientifique
UPR 1086, Montpellier, 34293 France; The signaling role of the Ca2+ releaser
inositol 1,4,5-trisphosphate (IP3) has been
associated with diverse cell functions. Yet, the physiological
significance of IP3 in tissues that feature a
ryanodine-sensitive sarcoplasmic reticulum has remained elusive. IP3 generated by photolysis of caged IP3 or by
purinergic activation of phospholipase C
Division of
Cardiovascular Diseases, Department of Medicine and Molecular
Pharmacology, Mayo Clinic, Rochester, Minnesota 55905; and
Department of Physiology, Centre Médical
Universitaire, Genève, Switzerland
slowed down or
abolished autonomic Ca2+ spiking in neonatal rat
cardiomyocytes. Microinjection of heparin, blocking dominant-negative
fusion protein, or anti-phospholipase C
antibody prevented the
IP3-mediated purinergic effect. IP3 triggered a
ryanodine- and caffeine-insensitive Ca2+ release restricted
to the perinuclear region. In cells loaded with Rhod2 or expressing a
mitochondria-targeted cameleon and TMRM to monitor mitochondrial
Ca2+ and potential, IP3 induced transient
Ca2+ loading and depolarization of the organelles. These
mitochondrial changes were associated with Ca2+ depletion
of the sarcoplasmic reticulum and preceded the arrest of cellular
Ca2+ spiking. Thus, IP3 acting within a
restricted cellular region regulates the dynamic of calcium flow
between mitochondria and the endoplasmic/sarcoplasmic reticulum. We
have thus uncovered a novel role for IP3 in excitable
cells, the regulation of cardiac autonomic activity.
Corresponding author. E-mail address:
puceat{at}crbm.cnrs-mop.fr.
¶
Present address: Departement de Geriatrie, Centre
Médical Universitaire, Geneva, Switzerland.
#
Present address: Division of Biochemistry,
University of Tasmania, Hobart, Australia.
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