© 1997 American Heart Association, Inc.
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Smooth Muscle Cells Isolated From Discrete Compartments of the Mature Vascular Media Exhibit Unique Phenotypes and Distinct Growth Capabilities
From the Developmental Lung Biology Research (M.G.F., A.A.A., K.R.S.) and Cardiovascular Pulmonary (E.C.D.) Laboratories, University of Colorado Health Sciences Center, Denver.
Correspondence to Maria G. Frid, PhD, Developmental Lung Biology Research, University of Colorado Health Sciences Center, Box B131, 4200 East 9th Ave, Denver, CO 80262. E-mail Maria.Frid{at}UCHSC.com
Abstract Heterogeneity of smooth muscle cell (SMC) phenotype and function is rapidly emerging as an important concept. We have recently described that phenotypically distinct SMC subpopulations in bovine pulmonary arteries exhibit unique proliferative and matrix-producing responses to hypoxic pulmonary hypertension. To provide better understanding of the molecular mechanisms contributing to this phenomenon, experimental studies will require a reliable in vitro model. The purpose of the present study was first to determine if distinct SMC subpopulations, similar to those observed in vivo, could be selectively isolated from the mature arterial media, and then to evaluate whether select SMC subpopulations would exhibit heightened responses to growth-promoting stimuli and hypoxia. We were able to reproducibly isolate at least four phenotypically unique cell subpopulations from the inner, middle, and outer compartments of the arterial media. Differences in cell phenotype were demonstrated by morphological appearance and differential expression of muscle-specific proteins. The isolated cell subpopulations exhibited markedly different growth capabilities. Two SMC subpopulations grew slowly in 10% serum and were quiescent in plasma-based medium. The other two cell subpopulations, exhibiting nonmuscle characteristics, grew rapidly in 10% serum and proliferated in plasma-based medium and in response to hypoxia. Certain colonies of the nonmuscle-like cell subpopulations were found to grow autonomously under serum-deprived conditions and to secrete mitogenic factors. Our data, demonstrating that phenotypically distinct cells with enhanced growth potential exist within the normal arterial media, support the idea that these unique cells could contribute selectively to the pathogenesis of vascular disease.
Key Words: pulmonary hypertension • atherosclerosis • hypoxia • smooth muscle cell proliferation • smooth muscle cell heterogeneity
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