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. 1994 Sep;94(3):1297–1303. doi: 10.1172/JCI117448

Acid activation of immediate early genes in renal epithelial cells.

Y Yamaji 1, O W Moe 1, R T Miller 1, R J Alpern 1
PMCID: PMC295215  PMID: 8083371

Abstract

These studies examined the effect of acidosis on immediate early (IE) gene expression in renal tubule cells. In MCT cells, an SV40 transformed mouse proximal tubule cell line, incubation in acid media led to transient increases in c-fos, c-jun, junB, and egr-1 mRNA abundance, peaking at 30 min to 1 h. In vivo metabolic acidosis caused more prolonged increases in these mRNA species in renal cortex. Nuclear runon studies demonstrated increased rates of transcription for these IE genes. In addition, pretreatment of cells with cycloheximide caused superinduction of these mRNA by acid incubation. These responses are similar to those elicited by growth factors. Inhibition of tyrosine kinase pathways prevented IE gene activation by acid, while inhibition of protein kinase C and/or increases in cell calcium had no effect. In 3T3 cells, acid activated IE genes by a different mechanism in that the increase in mRNA did not include c-jun, was more prolonged, and was blocked by cycloheximide. In summary, incubation of renal cells in acid media leads to activation of IE genes that is similar to growth factor-induced IE gene activation, and is likely mediated by tyrosine kinase pathways.

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