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Postsynaptic calcium feedback between rods and rod bipolar cells in the mouse retina

Published online by Cambridge University Press:  25 February 2005

AMY BERNTSON ,
ROBERT G. SMITH  and
W. ROWLAND TAYLOR
AMY BERNTSON
Affiliation:
John Curtin School of Medical Research and Centre for Visual Sciences, Australian National University, Canberra, Australia
ROBERT G. SMITH
Affiliation:
Department of Neuroscience, University of Pennsylvania, Philadelphia
W. ROWLAND TAYLOR
Affiliation:
John Curtin School of Medical Research and Centre for Visual Sciences, Australian National University, Canberra, Australia Neurological Sciences Institute, Oregon Health and Sciences University, Beaverton
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Abstract

Light-evoked currents were recorded from rod bipolar cells in a dark-adapted mouse retinal slice preparation. Low-intensity light steps evoked a sustained inward current. Saturating light steps evoked an inward current with an initial peak that inactivated, with a time constant of about 60–70 ms, to a steady plateau level that was maintained for the duration of the step. The inactivation was strongest at hyperpolarized potentials, and absent at positive potentials. Inactivation was mediated by an increase in the intracellular calcium concentration, as it was abolished in cells dialyzed with 10 mM BAPTA, but was present in cells dialyzed with 1 mM EGTA. Moreover, responses to brief flashes of light were broader in the presence of intracellular BAPTA indicating that the calcium feedback actively shapes the time course of the light responses. Recovery from inactivation observed for paired-pulse stimuli occurred with a time constant of about 375 ms. Calcium feedback could act to increase the dynamic range of the bipolar cells, and to reduce variability in the amplitude and duration of the single-photon signal. This may be important for nonlinear processing at downstream sites of convergence from rod bipolar cells to AII amacrine cells. A model in which intracellular calcium rapidly binds to the light-gated channel and reduces the conductance can account for the results.

Keywords

Calcium feedbackMetabotropic synapseRetinal neuronsRod bipolar cellScotopic signalsVisual system
Type
Research Article
Information
Visual Neuroscience , Volume 21 , Issue 6 , November 2004 , pp. 913 - 924
Copyright
© 2004 Cambridge University Press

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