title: Increased levels and activity of matrix metalloproteinase-9 in obstructive sleep apnea syndrome.
abstract: Matrix metalloproteinases (MMPs) are involved in the pathogenesis of cardiovascular diseases. We examined serum levels of MMP-9 and its inhibitor, tissue inhibitor of metalloproteinase-1 (TIMP-1), activity of MMP-9, and the effect of nasal continuous positive airway pressure (nCPAP) in patients with obstructive sleep apnea syndrome (OSAS). After polysomnography, venous blood was collected at 5:00 A.M. from 44 patients with OSAS and 18 control subjects who were obese, and serum levels of MMP-9, TIMP-1, and enzymatic activity of MMP-9 were measured. In addition, the effects of 1 month of treatment with nCPAP were studied in patients with moderate to severe OSAS. Although serum levels of MMP-9 (p < 0.03) and MMP-9 activity (p < 0.01) were higher in patients with OSAS than in control subjects who were obese, TIMP-1 levels did not differ significantly. In patients with OSAS, the severity of OSAS was the primary factor influencing levels (p < 0.01) and activity (p < 0.01) of MMP-9. nCPAP significantly decreased serum levels (p < 0.01) and activity (p < 0.001) of MMP-9 but did not affect TIMP-1 levels. Therefore, OSAS may increase risks of cardiovascular morbidity, and nCPAP might be useful for decreasing these risks.
authors.affiliation: First Department of Internal Medicine, Showa University, Shinagawa-ku, Tokyo 142-8666, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Tazaki
authors.forename: Kenji
authors.initials: K
authors.lastname: Minoguchi
authors.forename: Takuya
authors.initials: T
authors.lastname: Yokoe
authors.forename: Karen Thursday R
authors.initials: KT
authors.lastname: Samson
authors.forename: Hideko
authors.initials: H
authors.lastname: Minoguchi
authors.forename: Akihiko
authors.initials: A
authors.lastname: Tanaka
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Adachi
mesh_terms: D006801:Humans; D008297:Male; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D008875:Middle Aged; D012720:Severity of Illness Index; D012891:Sleep Apnea Syndromes / Q000201:enzymology*; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000378:metabolism
chemical_list: D019715:Tissue Inhibitor of Metalloproteinase-1; D020780:Matrix Metalloproteinase 9