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Heterogeneity of smooth muscle-associated proteins in mammalian brain microvasculature

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Abstract

In the brain, the microvascular system is composed of endothelial cells surrounded by a layer of pericytes. The lack of smooth muscle cells in this tissue suggests that any contractile function must be performed by one or both of these cell types. The present study was undertaken in order to identify cells in terminal blood vessels that contain smooth muscle-like contractile machinery. Endothelial cells were reactive with antibodies against smooth muscle myosin but showed no other smooth muscle-related features. In contrast, pericytes of intact microvessels showed a pattern of protein expression similar to that of smooth muscle cells. Pericytes also behaved in tissue culture like cultured smooth muscle cells, with regard to the changes in expression of smooth muscle-related proteins. These data confirm the close relationship between smooth muscle cells and pericytes, and point to their contractile function in the brain microvessels.

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  1. Institute of Molecular Biology, Austrian Academy of Sciences, Billrothstrasse 11, A-5020, Salzburg, Austria

    Elisabeth Ehler, Gerlinde Karlhuber, Hans-Christian Bauer & Annette Draeger

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  1. Elisabeth Ehler
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  2. Gerlinde Karlhuber
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Ehler, E., Karlhuber, G., Bauer, HC. et al. Heterogeneity of smooth muscle-associated proteins in mammalian brain microvasculature. Cell Tissue Res 279, 393–403 (1995). https://doi.org/10.1007/BF00318497

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