Summary
Smooth muscle cell proliferation is an important feature of atherogenesis. Some works have hypothesized that a transformation of smooth muscle cells could arise during this pathological process. The present paper describes two spontaneously transformed cell lines of arterial smooth muscle cells (SMC) established from aortic media of adult rat. The cell lines have been designated V6 and V8; some of their morphologic, growth, and metabolic characteristics are described and compared to their parent cells. The two cell lines appeared distinct by their morphology and by their degree of transformation. V6 cells appeared as elongated spindle-shaped cells whereas V8 cells were spread cells with a cobblestone pattern. Karyotypes of both cell lines showed a high polyploidy level. V6 and V8 cell lines were immortalized and showed growth characteristics of transformed cells: low requirement of serum to grow, ability to form colonies in soft agar and tumorigenicity in nude mice; V8 cells presented a higher malignancy than V6 cells. Both V6 and V8 cells exhibited characteristics of cultured arterial SMC: ultrastructure, alpha actin expression at the protein and mRNA level, prostacyclin production. The remarkably different morphologies of the V6 and V8 lines and their transformed phenotype suggest that these cell lines could be useful models to study SMC differentiation and proliferation with respect to atherosclerotic or hypertensive vascular diseases.
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Electron microscopy was performed in the Center of Electron Microscopy Applied to Biology and Geology (CEMABG), Claude Bernard University, Lyon I. Flow cytofluorometry was performed in the Center of Fluorometry, Department of Human Biology, Claude Bernard University, Lyon I and funded by ARC No 6055-80.
This work was supported by INSERM, by MRT grant 86-C-0301 and by ARC grant 415-87.
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Blaes, N., Bourdillon, MC., Daniel-Lamaziere, JM. et al. Isolation of two morphologically distinct cell lines from rat arterial smooth muscle expressing high tumorigenic potentials. In Vitro Cell Dev Biol – Animal 27, 725–734 (1991). https://doi.org/10.1007/BF02633218
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DOI: https://doi.org/10.1007/BF02633218