TY - JOUR
T1 - Characterization of primary and restenotic atherosclerotic plaque from the superficial femoral artery
T2 - Potential role of Smad3 in regulation of SMC proliferation
AU - Edlin, Rachel S.
AU - Tsai, Shirling
AU - Yamanouchi, Dai
AU - Wang, Chunjie
AU - Liu, Bo
AU - Kent, K. Craig
PY - 2009/5
Y1 - 2009/5
N2 - Objective: To characterize and compare primary and restenotic lesions of the superficial femoral artery and analyze the contribution of TGF-β/Smad3 signaling to the pathophysiology of peripheral artery occlusive disease. Methods and Results: Immunohistochemical studies were performed on specimens retrieved from the superficial femoral artery of patients undergoing either atherectomy for primary atherosclerotic or recurrent disease after stenting and/or prior angioplasty. Immunohistochemical analysis revealed a significantly higher smooth muscle cell (SMC) content (α-actin+) and expression of Smad3 in restenotic lesions while primary lesions contained significantly more leukocytes (CD45+) and macrophages (CD68+). Further studies demonstrated colocalization of Smad3 with α-actin and PCNA, suggesting a role for Smad3 in the proliferation observed in restenotic lesions. To confirm a role for Smad3 in SMC proliferation, we both upregulated Smad3 via adenoviral mediated gene transfer (AdSmad3) and inhibited Smad3 through transfection with siRNA in human aortic SMCs, then assessed cell proliferation with tritiated thymidine. Overexpression of Smad3 enhanced whereas inhibition of Smad3 decreased cell proliferation. Conclusion: Differences in cellular composition and cell proliferation in conjunction with the finding that Smad3 is expressed exclusively in restenotic disease suggest that TGF-β, through Smad3 signaling, may play an essential role in SMC proliferation and the pathophysiology of restenosis in humans.
AB - Objective: To characterize and compare primary and restenotic lesions of the superficial femoral artery and analyze the contribution of TGF-β/Smad3 signaling to the pathophysiology of peripheral artery occlusive disease. Methods and Results: Immunohistochemical studies were performed on specimens retrieved from the superficial femoral artery of patients undergoing either atherectomy for primary atherosclerotic or recurrent disease after stenting and/or prior angioplasty. Immunohistochemical analysis revealed a significantly higher smooth muscle cell (SMC) content (α-actin+) and expression of Smad3 in restenotic lesions while primary lesions contained significantly more leukocytes (CD45+) and macrophages (CD68+). Further studies demonstrated colocalization of Smad3 with α-actin and PCNA, suggesting a role for Smad3 in the proliferation observed in restenotic lesions. To confirm a role for Smad3 in SMC proliferation, we both upregulated Smad3 via adenoviral mediated gene transfer (AdSmad3) and inhibited Smad3 through transfection with siRNA in human aortic SMCs, then assessed cell proliferation with tritiated thymidine. Overexpression of Smad3 enhanced whereas inhibition of Smad3 decreased cell proliferation. Conclusion: Differences in cellular composition and cell proliferation in conjunction with the finding that Smad3 is expressed exclusively in restenotic disease suggest that TGF-β, through Smad3 signaling, may play an essential role in SMC proliferation and the pathophysiology of restenosis in humans.
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U2 - 10.1016/j.jvs.2008.11.096
DO - 10.1016/j.jvs.2008.11.096
M3 - Article
C2 - 19394554
AN - SCOPUS:65249093597
SN - 0741-5214
VL - 49
SP - 1289
EP - 1295
JO - Journal of Vascular Surgery
JF - Journal of Vascular Surgery
IS - 5
ER -