title: Comparison of differential expression of P2Y₁₂ receptor in culprit coronary plaques in patients with acute myocardial infarction versus stable angina pectoris.
abstract: P2Y₁₂ receptor antagonists may have pleiotropic benefits. Little is known, however, about the expression of P2Y₁₂ receptors in coronary atherosclerotic plaques. We investigated the expression of P2Y₁₂ receptor in coronary atherectomy tissues retrieved from patients with acute myocardial infarction (AMI) or stable angina pectoris (SAP). Tissue specimens were collected from 35 patients with AMI and 19 with SAP who underwent directional coronary atherectomy. Specimens were analyzed immunohistochemically using antibodies specific to P2Y₁₂ receptor and to markers of endothelial cells, macrophages, and smooth muscle cells. The 2 groups had similar baseline clinical characteristics. Plaque types were more likely to be cellular in the AMI group. The proportion of areas immunopositive for α-smooth muscle actin was smaller but those positive for CD31 and CD68 were larger in the AMI than in the SAP group. In addition, the relative area immunopositive for P2Y₁₂ receptor was significantly larger for AMI than SAP (1.1 ± 0.9% vs 0.5 ± 0.4%, respectively, p < 0.001). P2Y₁₂ receptor positivity coincided with areas positive for CD31 and α-smooth muscle actin. In conclusion, P2Y₁₂ receptor is present in coronary atherosclerotic plaques and is increased in culprit plaques of patients with AMI. P2Y₁₂ receptor may play a role in plaque destabilization.
authors: Department of Medicine, Asan Medical Center, University of Ulsan, Seoul, Korea.
authors: Cheol Whan
authors: CW
authors: Lee
authors: Ilseon
authors: I
authors: Hwang
authors: Chan-Sik
authors: CS
authors: Park
authors: Hyangsin
authors: H
authors: Lee
authors: Duk-Woo
authors: DW
authors: Park
authors: Su-Jin
authors: SJ
authors: Kang
authors: Seung-Whan
authors: SW
authors: Lee
authors: Young-Hak
authors: YH
authors: Kim
authors: Seong-Wook
authors: SW
authors: Park
authors: Seung-Jung
authors: SJ
authors: Park
mesh_terms: D000199:Actins / Q000378:metabolism; D000787:Angina Pectoris / Q000378:metabolism*; D015703:Antigens, CD / Q000378:metabolism; D015214:Antigens, Differentiation, Myelomonocytic / Q000378:metabolism; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000378:metabolism*; D058226:Plaque, Atherosclerotic / Q000378:metabolism*; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000378:metabolism; D058925:Receptors, Purinergic P2Y12 / Q000378:metabolism*; D013194:Staining and Labeling; D018709:Statistics, Nonparametric; D000097382:CD68 Molecule
chemical_list: D000199:Actins; D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D058925:Receptors, Purinergic P2Y12; C067980:CD68 antigen, human; D000097382:CD68 Molecule