Acid activation of immediate early genes in renal epithelial cells

Yasuyoshi Yamaji, Orson W. Moe, R. Tyler Miller, Robert J. Alpern

Research output: Contribution to journalArticle

53 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)1297-1303
Number of pages7
JournalJournal of Clinical Investigation
Volume94
Issue number3
StatePublished - Sep 1994

Fingerprint

Immediate-Early Genes
Epithelial Cells
Kidney
Acids
Messenger RNA
Cycloheximide
Acidosis
Protein-Tyrosine Kinases
Transcriptional Activation
Intercellular Signaling Peptides and Proteins
3T3 Cells
Protein Kinase C
Calcium
Gene Expression
Cell Line

Keywords

  • egr
  • fos
  • herbimycin A
  • jun
  • tyrosine kinase

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Acid activation of immediate early genes in renal epithelial cells. / Yamaji, Yasuyoshi; Moe, Orson W.; Miller, R. Tyler; Alpern, Robert J.

In: Journal of Clinical Investigation, Vol. 94, No. 3, 09.1994, p. 1297-1303.

Research output: Contribution to journalArticle

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