Abstract
We have explored the cellular loci of endothelin (ET) actions and formation in the brain, using cerebellar mutant mice as well as primary and continuous cell cultures. A glial role is favored by several observations: (i) mutant mice lacking neuronal Purkinje cells display normal ET receptor binding and enhanced stimulation by ET of inositolphospholipid turnover; (ii) in weaver mice lacking neuronal granule cells, ET stimulation of inositolphospholipid turnover is not significantly diminished; (iii) C6 glioma cells and primary cultures of cerebellar astroglia exhibit substantial ET receptor binding and ET-induced stimulation of inositolphospholipid turnover; (iv) ET promotes mitogenesis of C6 glioma cells and primary cerebellar astroglia; and (v) primary cultures of cerebellar astroglia contain ET mRNA. ET also appears to have a neuronal role, since it stimulates inositolphospholipid turnover in primary cultures of cerebellar granule cells, and ET binding declines in granule cell-deficient mice. Thus, ET can be produced by glia and act upon both glia and neurons in a paracrine fashion.
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