Gene expression profile of endothelin-1-induced growth in glomerular mesangial cells.
Endothelin (ET)-1 is a vasoconstrictor and mitogen involved in vascular remodeling. Changes in gene expression that underlie control of cell growth by ET-1 remain poorly characterized. To identify pathways of growth control we used microarrays to analyze ET-1-regulated gene expression in human mesangial cells, an important ET-1 vascular target cell in vivo. Statistical assessment of differential expression (significance analysis of microarrays) revealed upregulated transcripts for growth factors [heparin-binding epidermal growth factor (EGF)-like growth factor (HB-EGF), fibroblast growth factor (FGF), interleukin (IL)-6] and downregulated transcripts for genes that inhibit growth (BAX, p27KIP1, DAD1). Consistent with the gene expression profile, quantitative RT-PCR and Western blotting confirmed induction of HB-EGF by ET-1. To test a functional role for HB-EGF in ET-1 signaling, we showed that exogenous HB-EGF stimulated phosphorylation of ErbB1 and growth of mesangial cells. ET-1-induced proliferation was blocked by an ErbB1 receptor-selective kinase inhibitor and by a specific ErbB1 receptor-neutralizing antibody. Proliferation in response to ET-1 was also inhibited by neutralizing antisera against human HB-EGF. Together, these results provide data for modeling ET-1 pathways for growth control and suggest a specific role for HB-EGF gene induction in mesangial cell growth in response to ET-1.
Mishra
Rangnath
R
Division of Nephrology, Department of Medicine, Biomedical Research Bldg., Rm. 427, Case Western Reserve University, 2109 Adelbert Road, Cleveland, OH 44106, USA.
Leahy
Patrick
P
Simonson
Michael S
MS
D002455:Cell Division / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D002478:Cells, Cultured; D019332:Endothelin-1 / Q000494:pharmacology / Q000502:physiology*; D020869:Gene Expression Profiling / Q000379:methods*; D005786:Gene Expression Regulation / Q000187:drug effects* / Q000502:physiology; D005920:Glomerular Mesangium / Q000166:cytology* / Q000502:physiology*; D006133:Growth Substances / Q000502:physiology*; D006801:Humans; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D015533:Transcriptional Activation
D019332:Endothelin-1; D006133:Growth Substances