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J Am Soc Nephrol 13:2068-2076, 2002
© 2002 American Society of Nephrology

Association of a Decreased Number of d(CA) Repeats in the Matrix Metalloproteinase-9 Promoter with Glomerulosclerosis Susceptibility in Mice

Alessia Fornoni, Yingcai Wang, Oliver Lenz, Liliane J. Striker and Gary E. Striker

Vascular Biology Institute, Department of Medicine, University of Miami School of Medicine, Miami, Florida.

Correspondence to Dr. Gary E. Striker, University of Miami School of Medicine, Rosenstiel Medical Science Building, 1600 NW 10 Avenue, Room 1044 (R-104), Miami, FL 33136. Phone: 305-243-2811; Fax: 305-243-2810; E-mail: gstriker{at}miami.edu

ABSTRACT. The genetic background plays an important role in the development of progressive glomerulosclerosis. However, no marker is available for the reliable prediction of genetic susceptibility to glomerulosclerosis. Because matrix metalloproteinase-9 (MMP-9) levels are decreased in models of glomerulosclerosis and MMP-9 promoter polymorphism has been observed among patients with diabetic nephropathy, MMP-9 could be one such marker. The object of this study was to determine whether MMP-9 promoter polymorphism was associated with altered MMP-9 expression in mesangial cells (MC) from two mouse strains, i.e., ROP (glomerulosclerosis prone) and B6SJL (glomerulosclerosis resistant). ROP MC expressed 12-fold less MMP-9 mRNA. The MMP-9 promoter in ROP MC contained fewer d(CA) repeats, which was associated with lower MMP-9 expression and activity. Phorbol-12-myristate-13-acetate (3 to 60 ng/ml) increased MMP-9 expression in both MC types (3- to 4.5-fold), but the level in ROP MC never reached that in B6SLJ MC. Although reciprocal transfection of ROP and B6SJL MMP-9 promoter constructs into B6SJL and ROP cells revealed that the promoters were functional in both cell types, the B6SJL promoter was less responsive to phorbol-12-myristate-13-acetate stimulation when transfected into ROP MC, suggesting a role for other factors. In conclusion, the MMP-9 promoter exhibits a decreased number of d(CA) repeats in the sclerosis-prone strain. Because fewer d(CA) repeats associated with decreased MMP-9 expression in MC, it might be a genetic marker for glomerulosclerosis.




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