Published online before print August 30, 2001, doi: 10.1161/hh1801.097165
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Innate Diversity of Adult Human Arterial Smooth Muscle Cells
Cloning of Distinct Subtypes From the Internal Thoracic Artery
From the John P. Robarts Research Institute (Vascular Biology Group) (S.L., L.H.C., C.V.D.D., E.V.D.V., J.G.P.), London Health Science Centre (Y.F., L.H.C., J.G.P.), Departments of Pathology (Y.F.), Medicine (Cardiology) (L.H.C., J.G.P.), Physiology (S.M.S.), Biochemistry (J.G.P.), and Medical Biophysics (J.G.P.), University of Western Ontario, London, Canada.
Correspondence to J. Geoffrey Pickering, MD, PhD, London Health Science Centre, 339 Windermere Rd, London, Ontario N6A 5A5. E-mail gpickering{at}rri.on.ca
Abstract — Vascular smooth muscle cells (SMCs) perform diverse functions and this functional heterogeneity could be based on differential recruitment of distinct SMC subsets. In humans, however, there is little support for such a paradigm, partly because isolation of pure human SMC subsets has proven difficult. We report the cloning of 12 SMC lines from a single fragment of human internal thoracic artery and the elucidation of 2 distinct cellular profiles. Epithelioid clones (n=9) were polygonal at confluence, 105±9 µm in length, and had a doubling time of 39±2 hours. Spindle-shaped clones (n=3) were larger (267±18 µm long, P<0.01) and grew slower (doubling time 65±4 hours, P<0.01). Both types of clones expressed smooth muscle (SM) 
-actin, SM-myosin heavy chains, h-caldesmon, and calponin, but only spindle-shaped clones expressed metavinculin. Epithelioid clones displayed greater proliferation in response to platelet-derived growth factor-BB and fibroblast growth factor-2 and were more responsive to the migratory effect of platelet-derived growth factor-BB. Spindle-shaped clones showed more robust Ca2+ transients in response to angiotensin II, histamine, and norepinephrine, crawled more quickly, and expressed more type I collagen. On serum withdrawal, spindle-shaped clones differentiated into a contraction-competent cell. A regional basis for diversity among SMCs was suggested by stepwise arterial digestion, which liberated small, SM -actin–positive cells from the abluminal medial layers and larger SMCs from all layers. These results identify inherent SMC diversity in the media of the adult internal thoracic artery and suggest differential participation of SMC subsets in the regulation of human arterial behavior.
Key Words: vascular smooth muscle • proliferation • migration • gene expression
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