Reversibility of established diabetic glomerulopathy by anti-TGF-beta antibodies in db/db mice

Biochem Biophys Res Commun. 2003 Jan 3;300(1):16-22. doi: 10.1016/s0006-291x(02)02708-0.

Abstract

Treatment with a neutralizing anti-transforming growth factor-beta (TGF-beta) antibody can prevent the development of diabetic nephropathy in the db/db mouse, a model of type 2 diabetes. However, it is unknown whether anti-TGF-beta therapy can reverse the histological lesions of diabetic glomerulopathy once they are established. Diabetic db/db mice and their non-diabetic db/m littermates were allowed to grow until 16 weeks of age, by which time the db/db mice had developed glomerular basement membrane (GBM) thickening and mesangial matrix expansion. The mice were then treated with an irrelevant control IgG or a panselective, neutralizing anti-TGF-beta antibody for eight more weeks. Compared with control db/m mice, the db/db mice treated with IgG had developed increased GBM width (16.64+/-0.80 nm vs. 21.55+/-0.78 nm, P<0.05) and increased mesangial matrix fraction (4.01+/-0.81% of total glomerular area vs. 9.55+/-1.04%, P<0.05). However, the db/db mice treated with anti-TGF-beta antibody showed amelioration of GBM thickening (18.40+/-0.72 nm, P<0.05 vs. db/db-IgG) and mesangial matrix accumulation (6.32+/-1.79%, P<0.05 vs. db/db-IgG). Our results demonstrate that inhibiting renal TGF-beta activity can partially reverse the GBM thickening and mesangial matrix expansion in this mouse model of type 2 diabetes. Anti-TGF-beta regimens would be useful in the treatment of diabetic nephropathy.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Basement Membrane / pathology
  • Blood Glucose / metabolism
  • Diabetic Nephropathies / genetics
  • Diabetic Nephropathies / pathology
  • Diabetic Nephropathies / prevention & control
  • Diabetic Nephropathies / therapy*
  • Female
  • Glomerular Mesangium / pathology
  • Humans
  • Immunoglobulin G / administration & dosage
  • Mice
  • Mice, Inbred C57BL
  • Mice, Mutant Strains
  • Neutralization Tests
  • Transforming Growth Factor beta / antagonists & inhibitors*
  • Transforming Growth Factor beta / physiology

Substances

  • Blood Glucose
  • Immunoglobulin G
  • Transforming Growth Factor beta