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1998:
New K C; Rabkin S D
GABA synthesis in astrocytes after infection with defective herpes simplex virus vectors expressing glutamic acid decarboxylase 65 or 67.
Journal of neurochemistry 1998;
71(
6):.
Defective herpes simplex virus (HSV) vectors containing glutamic acid decarboxylase (GAD) cDNAs, either GAD65 or GAD67, were used to examine GAD function and GABA synthesis in rat cortical astrocytes, CNS cells that do not endogenously synthesize GABA. GAD vector infection resulted in isoform-specific expression of GAD as determined by western blotting and immunohistochemistry. Astrocytes infected with a beta-galactosidase vector or uninfected expressed no GAD and contained no detectable GABA. GABA was detected in glial fibrillary acid protein-expressing cells after GAD65 vector infection. Significant amounts of GABA, as determined by HPLC, were synthesized in cultures infected with either GAD vector. The levels of GABA in GAD67 vector-infected cells were almost twofold higher than in GAD65 vector-infected cells. Vector infection did not alter levels of other intracellular amino acids. GABA was tonically released from astrocytes infected with the GAD67 vector, but no increase in release could be detected after treatment of the cells with K+, veratridine, glutamate, or bradykinin. The ability to transduce astrocytes so that they express GAD and thereby increase GABA levels provides a potential strategy for the treatment of neurologic disorders associated with hyperexcitable or diminished inhibitory activity.
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