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American Journal of Pathology, Vol 137, 761-765, Copyright © 1990 by American Society for Investigative Pathology
REGULAR ARTICLES |
JM Miano, RR Tota, N Vlasic, KJ Danishefsky and MB Stemerman
Department of Pathology, New York Medical College, Valhalla 10595.
To study the mechanism(s) of vascular smooth muscle cell proliferation in vivo, mRNA levels of c-fos, c-jun, and c-myc were determined by Northern blot analysis following vascular balloon de-endothelialization (BDE). Medial smooth muscle cells (SMC) were separated and studied by enzymatic digestion of the vessel wall. mRNA levels of c-fos and c-jun from aortic smooth muscle cells (SMC) were simultaneously induced within 30 minutes of BDE and declined to baseline by 1.5 hours, c-myc mRNA did not begin to increase until 1 hour after vascular injury. Levels of c-myc peaked at 2 hours and were sustained for an additional 4 hours before gradually declining. Smooth muscle cells derived from enzyme-treated control aortae that did not undergo BDE expressed c-fos and c-jun, but showed no evidence of c-myc message. In contrast, nonenzymatically treated, non-BDE whole aortae (containing both media and adventitia) demonstrated a prominent c-myc signal, but failed to express c-fos and c-jun. Corresponding examination of adventitia derived from enzyme-treated aortae showed this tissue to be a source of all three proto-oncogenes. The results of this study demonstrate the earliest in vivo molecular markers of vascular injury reported to date and implicate SMC proto-oncogene expression in the initiation of SMC proliferation. Furthermore these findings suggest two avenues for proto- oncogene induction, that are due to (1) vessel wall manipulation and (2) humoral stimulation.
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