title: Elevated circulating levels of matrix metalloproteinases MMP-2 and MMP-9 in pseudoxanthoma elasticum patients.
abstract: Pseudoxanthoma elasticum (PXE) is a rare disorder predominantly affecting the skin, the eyes, and the cardiovascular system. The disease is caused by mutations in the ABCC6 gene and characterized by ectopic calcification and extracellular matrix (ECM) alterations. Matrix metalloproteinases (MMPs) play a pivotal role in the process of ECM remodeling. In the present study, we investigated matrix metalloproteinases MMP-2 and MMP-9 in PXE patients compared to healthy controls. We analyzed the serum concentrations of MMP-2 and MMP-9 in a cohort of 69 German PXE patients and in 69 healthy, age-, and sex-matched control subjects using commercially available ELISA assays. We found elevated concentrations of both MMPs in the sera of PXE patients. MMP-2 levels were significantly higher in patients than controls (231 +/- 5.89 vs 202 +/- 5.17 ng/ml, p = 0.0002), as were MMP-9 levels (841 +/- 65.9 vs 350 +/- 30.8 ng/ml, p < 0.0001). Our findings point to an involvement of matrix metalloproteinases in PXE pathology. ECM remodeling in PXE is reflected by elevated levels of circulating MMP-2 and MMP-9. Those MMPs might, therefore, be applicable as serum markers for the matrix-degradative process in PXE.
authors: Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinik der Ruhr-Universität Bochum, Bad Oeynhausen, Germany.
authors: Ulf
authors: U
authors: Diekmann
authors: Ralf
authors: R
authors: Zarbock
authors: Doris
authors: D
authors: Hendig
authors: Christiane
authors: C
authors: Szliska
authors: Knut
authors: K
authors: Kleesiek
authors: Christian
authors: C
authors: Götting
mesh_terms: D000328:Adult; D000818:Animals; D015415:Biomarkers / Q000097:blood; D005109:Extracellular Matrix / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D020778:Matrix Metalloproteinase 2 / Q000097:blood*; D020780:Matrix Metalloproteinase 9 / Q000097:blood*; D008875:Middle Aged; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics / Q000378:metabolism; D011561:Pseudoxanthoma Elasticum / Q000097:blood* / Q000201:enzymology* / Q000235:genetics / Q000473:pathology
chemical_list: D015415:Biomarkers; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D027425:ATP-Binding Cassette, Sub-Family C Proteins; C102029:ABCC6 protein, human