Inhibition of high-affinity gamma-aminobutyric acid uptake in primary astrocyte cultures by phorbol esters and phospholipase C.
The effects of phorbol 12-myristate 13-acetate (PMA), a potent activator of protein kinase C (PKC), on high-affinity Na(+)-dependent gamma-aminobutyric acid (GABA) uptake were investigated in primary cultures of neurons and glial cells from rat brain cortex. Incubation of glial cells with PMA led to concentration- and time-dependent decreases in the GABA transport in glial cells. This effect could be completely suppressed by addition of the PKC inhibitor H7. The PMA effects could be mimicked by oleoylacetylglycerol, the diacylglycerol kinase inhibitor R59022 and exogenous phospholipase C. Treatment with PMA did not affect GABA transport in neuronal cells.
Gomeza
J
J
Departamento de Biología Molecular, Facultad de Ciencias, Universidad Autonoma, Madrid, Spain.
Casado
M
M
Gimenez
C
C
Aragon
C
C
D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000818:Animals; D000831:Animals, Newborn; D001253:Astrocytes / Q000187:drug effects / Q000378:metabolism*; D001409:Bacillus cereus / Q000201:enzymology; D001692:Biological Transport / Q000187:drug effects; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000378:metabolism*; D005904:Glial Fibrillary Acidic Protein / Q000032:analysis; D007546:Isoquinolines / Q000494:pharmacology; D007700:Kinetics; D010703:Phorbol Esters / Q000494:pharmacology*; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000494:pharmacology*; D047428:Protein Kinase Inhibitors; D051381:Rats; D011919:Rats, Inbred Strains; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
D005904:Glial Fibrillary Acidic Protein; D007546:Isoquinolines; D010703:Phorbol Esters; D010879:Piperazines; D047428:Protein Kinase Inhibitors; D005680:gamma-Aminobutyric Acid; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate