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The Journal of Neuroscience, June 1, 1998, 18(11):4022-4028

Modulation of Neuronal Activity by Glial Cells in the Retina

Eric A. Newman and Kathleen R. Zahs

Department of Physiology, University of Minnesota, Minneapolis, Minnesota 55455

Glial-neuronal communication was studied by monitoring the effect of intercellular glial Ca²⁺ waves on the electrical activity of neighboring neurons in the eyecup preparation of the rat. Calcium waves in astrocytes and Müller cells were initiated with a mechanical stimulus applied to the retinal surface. Changes in the light-evoked spike activity of neurons within the ganglion cell layer occurred when, and only when, these Ca²⁺ waves reached the neurons. Inhibition of activity was observed in 25 of 53 neurons (mean decrease in spike frequency, 28 ± 2%). Excitation occurred in another five neurons (mean increase, 27 ± 5%). Larger amplitude Ca²⁺ waves were associated with greater modulation of neuronal activity. Thapsigargin, which reduced the amplitude of the glial Ca²⁺ increases, also reduced the magnitude of neuronal modulation. Bicuculline and strychnine, inhibitory neurotransmitter antagonists, as well as 6-Nitro-7-sulphamoylbenzo[f]quinoxaline-2,3-dione (NBQX) and D()-2-amino-7-phosphonoheptanoic acid (D-AP7), glutamate antagonists, reduced the inhibition of neuronal activity associated with glial Ca²⁺ waves, suggesting that inhibition is mediated by inhibitory interneurons stimulated by glutamate release from glial cells. The results suggest that glial cells are capable of modulating the electrical activity of neurons within the retina and thus, may directly participate in information processing in the CNS.

Key words: calcium waves; glial cells; astrocytes; Müller cells; neurons; ganglion cells; retina; modulation; glial-neuronal interaction

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Copyright © 1998 Society for Neuroscience  0270-6474/98/18114022-07$05.00/0

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