Atherosclerosis and Lipoproteins |
From the Atherosclerosis Research Unit (S.J., C.W., A.H., P.E.), King Gustaf V Research Institute, Department of Medicine, Karolinska Institute, Karolinska Hospital, Stockholm, Sweden, and the Department of Internal Medicine (D.H.W., A.M.Z.), University of Frankfurt, Frankfurt, Germany.
Correspondence to Dr Per Eriksson, King Gustaf V Research Institute, Karolinska Hospital, S-171 76 Stockholm, Sweden. E-mail Per.Eriksson{at}medks.ki.se
Abstract An enhanced expression of matrix metalloproteinase (MMP)-7 has previously been demonstrated in atherosclerotic and aneurysmal tissue. Because perturbed regulation of MMP-7 may influence the development of these diseases, we searched the MMP-7 promoter for functional polymorphisms. An A to G substitution at position -181 (-181 A/G) and a C to T substitution at position -153 (-153 C/T) with frequencies of 0.50 and 0.10, respectively, were identified. Allele-specific associations were studied in 350 patients undergoing percutaneous transluminal coronary angioplasty. Hypercholesterolemic patients carrying the -181G allele or the -153T allele had smaller reference luminal diameters before percutaneous transluminal coronary angioplasty. Reverse transcriptionpolymerase chain reaction demonstrated that expression of MMP-7 was confined to differentiated U937 cells. Northern blot analysis could not detect an effect of native or oxidatively modified low density lipoprotein on MMP-7 expression. Thus, the limitation of allele-specific effects on vessel wall remodeling to hypercholesterolemic patients may be secondary to lipid-mediated accumulation of MMP-7expressing monocyte-derived macrophages within the vessel wall. Both polymorphisms influenced the binding of nuclear proteins. Furthermore, in transient transfection studies, the combination of the 2 rare alleles conferred an increased promoter activity. In conclusion, the present study identified and characterized 2 common polymorphisms in the promoter region of the MMP-7 gene that are functional in vitro and seem to influence coronary arterial dimensions in hypercholesterolemic patients with manifest coronary artery disease.
Key Words: matrix metalloproteinase-7 matrilysin polymorphisms LDL gene regulation
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