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Molecular mechanisms of glial swelling in vitro

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Neurochemical Pathology

Abstract

The pathophysiological chain of events occurring during cerebral ischemia is still poorly understood on a molecular level. Therefore, an in vitro model to study glial swelling mechanisms, using C6 glial cells under controlled extracellular conditions, has been established. Flow cytometry serves to determine even small cell volume changes. In this report, the effects of anoxia and acidosis on glial swelling are summarized. Anoxia alone, or in combination with iodoacetate to inhibit anaerobic glycolysis, did not cause an increase of glial volume for up to 2 h. Acidification of the incubation medium below pH 6.8, on the other hand, was immediately followed by cell swelling to 115% of normal. Amiloride or the absence of bicarbonate and Na+ in the medium significantly reduced glial swelling. The data support the contention that swelling results from an activation of the Na+/H+-antiporter to control intracellular pH. It is suggested that swelling in an ischemic penumbra is promoted by this mechanism. Therapeutic approaches to control cerebral pH might be useful to protect brain tissue in cerebral ischemia.

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Authors and Affiliations

  1. Institute of Surgical Research, Ludwig-Maximilians University, Klinikum Grosshadern, 8000, München 70, FRG

    O. Kempski, F. Staub, F. V. Rosen, M. Zimmer, A. Neu & A. Baethmann

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  1. O. Kempski
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  2. F. Staub
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  3. F. V. Rosen
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  4. M. Zimmer
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  5. A. Neu
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  6. A. Baethmann
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Supported by Deutsche Forschungsgemeinschaft: Ba 452/6-6

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Kempski, O., Staub, F., Rosen, F.V. et al. Molecular mechanisms of glial swelling in vitro. Neurochemical Pathology 9, 109–125 (1988). https://doi.org/10.1007/BF03160357

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