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Am J Physiol Heart Circ Physiol 279: H202-H209, 2000;
0363-6135/00 $5.00
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Vol. 279, Issue 1, H202-H209, July 2000

Colocalization of dihydropyridine and ryanodine receptors in neonate rabbit heart using confocal microscopy

Franklin Sedarat1, Liqun Xu1, Edwin D. W. Moore2, and Glen F. Tibbits1

1 Cardiac Membrane Research Laboratory, Simon Fraser University, Burnaby, British Columbia V5A 1S6; and 2 Department of Physiology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada

Because of undeveloped T tubules and sparse sarcoplasmic reticulum, Ca2+-induced Ca2+ release (CICR) may not be the major mechanism providing contractile Ca2+ in the neonatal heart. Spatial association of dihydropyridine receptors (DHPRs) and ryanodine receptors (RyRs), a key factor for CICR, was examined in isolated neonatal rabbit ventricular myocytes aged 3-20 days by double-labeling immunofluorescence and confocal microscopy. We found a significant increase (P < 0.0005) in the degree of colocalization of DHPR and RyR during development. The number of voxels containing DHPR that also contained RyR in the 3-day-old group (62 ± 1.8%) was significantly lower than in the other age groups (76 ± 1.3 in 6-day old, 75 ± 1.2 in 10-day old, and 79 ± 0.9% in 20-day old). The number of voxels containing RyR that also contained DHPR was significantly higher in the 20-day-old group (17 ± 0.5%) compared with the other age groups (10 ± 0.7 in 3-day old, 11 ± 0.6 in 6-day old, and 11 ± 0.5% in 10-day old). During this period, the pattern of colocalization changed from mostly peripheral to mostly internal couplings. Our results provide a structural basis for the diminished prominence of CICR in neonatal heart.

calcium; dyadic coupling; excitation-contraction coupling


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