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It has been confirmed that the receptor protein encoded by the c-kit proto-oncogene is expressed by cells of the hematopoietic, gonadal, pigment, and mast cell lineages and that its ligand, stem cell factor (SCF), is mainly expressed in their microenvironment. In a previous study we investigated the expression of the c-kit gene in human aortic endothelial cells (EC). In the present study we investigated the expression of SCF in human aortic EC and smooth muscle cells (SMC). Reverse transcription (RT)-PCR and Northern blot analyses showed that both human arterial EC and SMC expressed mRNA specific for the SCF gene. In addition, tissue-specific expression of the SCF gene was confirmed by in situ hybridization in the EC and the SMC. Western blot analysis and immunocytochemistry showed evidence of production of SCF protein in both the EC and the SMC. These results indicate the existence of mast cell-SMC interaction and of an autocrine loop of c-kit and its ligand on the surface of EC, suggesting that the interaction between c-kit protein and SCF may play an important role in metabolism of arterial wall and in the pathogenesis of atherosclerosis in the arterial intima.
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K Sugama, and
M Morimatsu
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