Articles |
From the Department of Pathology, University of Geneva, CMU, Geneva, Switzerland.
Correspondence to Professor G. Gabbiani, Department of Pathology, CMU, 1, rue Michel-Servet, 1211 Geneva 4, Switzerland.
Abstract It is well accepted that smooth muscle cells (SMCs) cultured from normal rat arterial media have different morphological and biological features compared with SMCs cultured from experimental intimal thickening (IT) 15 days after endothelial injury. It is not known, however, whether the phenotypic modulation producing IT cells occurs in any medial SMCs or only in a particular SMC subpopulation. To distinguish among these possibilities, the phenotypic features of SMC clones derived from normal adult media and the IT 15 days after endothelial lesion were analyzed according to morphological appearance, replicative activity in the presence and absence of fetal calf serum, and [3H]thymidine incorporation and motile activity; these features were compared with those of the respective SMC parental populations. Two categories of SMC clones predominated: spindle clones, with morphological features similar to those of the parental population from the normal media, and epithelioid clones, with morphological features similar to those of the IT parental population. Both categories were present among clones produced from normal media and IT; however, spindle was more common among normal media clones, and epithelioid, among IT clones. The behavior in vitro was distinct for each category of clones and did not depend on their origin. Our results are compatible with the possibility that the SMC population of IT in vivo derives mainly from SMCs belonging to the category exhibiting epithelioid features in vitro.
Key Words: atheromatosis restenosis actin isoforms cell movement cell replication
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