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Kwon, H. Moo
Inflammation and Kidney Disorder Lab
Research Interests
  • TonEBP, Obesity, Cancer, Chronic inflammatory diseases, Brain disorder, Kidney disorders, Genomic instability

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Involvement of multiple kinase pathways in stimulation of gene transcription by hypertonicity

Cited 44 times inthomson ciCited 43 times inthomson ci
Title
Involvement of multiple kinase pathways in stimulation of gene transcription by hypertonicity
Author
Nahm, OWoo, SKHandler, JSKwon, H. Moo
Keywords
renal medulla; p38 mitogen-activated protein kinase; complimentary deoxyribonuclease microarray analysis
Issue Date
200201
Publisher
AMER PHYSIOLOGICAL SOC
Citation
AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY, v.282, no.1, pp.C49 - C58
Abstract
Osmolality of the mammalian renal medulla is high because of the operation of the urinary concentrating mechanism. To understand molecular events during the early phase of cellular adaptation to hypertonicity, we performed comprehensive searches for genes induced in response to hypertonicity using a cell line (mIMCD3) derived from the inner medullary collecting duct of mouse kidney. PCR-based subtractive hybridization of cDNA pools and cDNA microarray analysis were used. We report 12 genes whose mRNA expression is significantly increased within 4 h after exposure to hypertonicity. The increase in mRNA expression was the result of increased transcription. Many are either stress response genes or growth regulatory genes, supporting the notion that hypertonicity evokes the stress response and growth regulation in cells. Experiments using inhibitors revealed that mitogen-activated protein kinases were commonly involved in signaling for the induction of genes by hypertonicity. Tyrosine kinases and phosphatidylinositol 3-kinase also play a significant role. Signaling pathways for stimulation of transcription appeared quite diverse in that each gene was sensitive to different combinations of inhibitors.
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ISSN
0363-6143
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