Stem cell factor and c-kit are expressed by and may affect vascular SMCs through an autocrine pathway

The Journal of Surgical Research
Scott T HollenbeckK Craig Kent

Abstract

Stem cell factor (SCF) is a membrane-bound and soluble growth factor that activates the c-kit tyrosine kinase receptor. Given the similarities between c-kit and platelet-derived growth factor (PDGF) receptors, we hypothesized that similar to PDGF, SCF/c-kit signaling may play a role in smooth muscle cell (SMC) function and thus the development of intimal hyperplasia. Human saphenous vein SMCs were harvested from veins procured at the time of bypass grafting. Carotid arteries from rats that were balloon injured (n = 12) at variable time points were compared to sham-operated controls (n = 3). Expression of SCF and c-kit was measured by immunohistochemistry (IHC) and Western blotting. Western blotting revealed that human SMCs express membrane-bound SCF. In separate experiments, we found that this growth factor undergoes proteolytic cleavage to its soluble form following exposure to matrix metalloproteinase-9 (MMP-9), a ubiquitous MMP released at the time of arterial injury. We next evaluated in human SMCs, expression of the SCF receptor, c-kit. Western blotting of human SMC lysates revealed minor but consistent expression of c-kit. IHC demonstrated c-kit expression to be localized to the media. To determine if c-kit is up-regulate...Continue Reading

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Citations

Mar 27, 2012·American Journal of Physiology. Heart and Circulatory Physiology·Pasithorn A SuwanabolK Craig Kent
Jun 16, 2009·American Journal of Physiology. Heart and Circulatory Physiology·Shirling TsaiK Craig Kent
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