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. 1986 Oct;83(20):7951–7955. doi: 10.1073/pnas.83.20.7951

Transforming gene in human atherosclerotic plaque DNA.

A Penn, S J Garte, L Warren, D Nesta, B Mindich
PMCID: PMC386842  PMID: 3464011

Abstract

The monoclonal hypothesis equates atherosclerotic plaques with benign smooth muscle cell tumors and proposes that plaques can arise via mutational or viral events. Here, we provide direct evidence that molecular events, heretofore associated only with tumor cells, are common to plaque cells as well. Three distinct groups of human coronary artery plaque (hCAP) DNA samples transfected into NIH 3T3 cells gave rise to transformed foci. DNA samples from a panel of normal noncancerous human tissues, including coronary artery, were negative in the assay. Southern-blotted focus DNA yielded positive signals when hybridized to the 32P-labeled nick-translated repetitive human "Alu" DNA sequence. The DNA from cloned foci was used successfully in a second round of transfection. Focus DNA hybridized to nick-translated v-Ki-ras, v-Ha-ras, or N-ras probes failed to detect human fragments of these genes. Primary focus cells from each of five clones elicited tumors after injection into nude mice (6/42). Several distinct high molecular weight (greater than 6.6 kilobases) bands were detected after BamHI-digested tumor DNA was hybridized to Alu. Preliminary characterization of these hCAP DNA-associated tumors indicates that they are similar to the fibrosarcomas that arise after injection of ras-transformed cells into nude mice. We propose that transforming genes in plaque cells behave in a manner analogous to the way in which oncogenes behave in cancer cells.

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