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Kinetics of oxygen consumption and light-induced changes of nucleotides in solitary rod photoreceptors.

Kinetics of oxygen consumption and light-induced changes of nucleotides in solitary rod... We made simultaneous measurements of light-induced changes in the rate of oxygen consumption (QO2) and transmembrane current of single salamander rod photoreceptors. Since the change of PO2 was suppressed by 2 mM Amytal, an inhibitor of mitochondrial respiration, we conclude that it is mitochondrial in origin. To identify the cause of the change of QO2, we measured, in batches of rods, the concentrations of ATP and phosphocreatine (PCr). After 3 min of illumination, when the QO2 had decreased approximately 25%, ATP levels did not change significantly; in contrast, the amount of PCr had decreased approximately 40%. We conclude that either the light-induced decrease of QO2 is not caused by an increase in ATP or PCr, or that the light-induced change of PCr is highly heterogeneous in the rod cell. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of General Physiology Rockefeller University Press

Kinetics of oxygen consumption and light-induced changes of nucleotides in solitary rod photoreceptors.

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References (42)

Publisher
Rockefeller University Press
Copyright
© 1996 Rockefeller University Press
ISSN
0022-1295
eISSN
1540-7748
DOI
10.1085/jgp.108.2.75
Publisher site
See Article on Publisher Site

Abstract

We made simultaneous measurements of light-induced changes in the rate of oxygen consumption (QO2) and transmembrane current of single salamander rod photoreceptors. Since the change of PO2 was suppressed by 2 mM Amytal, an inhibitor of mitochondrial respiration, we conclude that it is mitochondrial in origin. To identify the cause of the change of QO2, we measured, in batches of rods, the concentrations of ATP and phosphocreatine (PCr). After 3 min of illumination, when the QO2 had decreased approximately 25%, ATP levels did not change significantly; in contrast, the amount of PCr had decreased approximately 40%. We conclude that either the light-induced decrease of QO2 is not caused by an increase in ATP or PCr, or that the light-induced change of PCr is highly heterogeneous in the rod cell.

Journal

The Journal of General PhysiologyRockefeller University Press

Published: Aug 1, 1996

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