Therapeutic role of TGF-β-neutralizing antibody in mouse Cyclosporin A nephropathy: Morphologic improvement associated with functional preservation

TGF-beta is believed to play a central role in the development of Cyclosporin A (CsA)-induced nephropathy. This study investigated the effects of 1D11, a murine pan-specific TGF-beta-neutralizing monoclonal antibody, in an ICR mouse model of chronic CsA nephropathy. Mice were administered a low-salt...

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Published in:	Journal of the American Society of Nephrology Vol. 14; no. 2; pp. 377 - 388
Main Authors:	HONG LING, XUEMEI LI, SHARDA JHA, WEI WANG, KARETSKAYA, Lina, PRATT, Bruce, LEDBETTER, Steven
Format:	Journal Article
Language:	English
Published:	Hagerstown, MD Lippincott Williams & Wilkins 01-02-2003
Subjects:	Animals Antibodies, Monoclonal - therapeutic use Apoptosis - drug effects Biological and medical sciences Chronic Disease Cyclosporine Extracellular Matrix Proteins - metabolism Kidney - pathology Kidney - physiopathology Kidney Diseases - chemically induced Kidney Diseases - drug therapy Kidney Diseases - pathology Kidney Diseases - physiopathology Kidneys Male Medical sciences Mice Mice, Inbred ICR Nephrology. Urinary tract diseases Nitric Oxide Synthase - metabolism Nitric Oxide Synthase Type II Nitric Oxide Synthase Type III Transforming Growth Factor beta - immunology Transforming Growth Factor beta - metabolism Urinary system involvement in other diseases. Miscellaneous Kidney disease Animal model Urinary system disease Renal function Transforming growth factor β Rodentia Pathology Vertebrata Chronic Mammalia Histopathology Nephropathy Mouse Animal Complication Ciclosporin Immunosuppressive agent
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Summary:	TGF-beta is believed to play a central role in the development of Cyclosporin A (CsA)-induced nephropathy. This study investigated the effects of 1D11, a murine pan-specific TGF-beta-neutralizing monoclonal antibody, in an ICR mouse model of chronic CsA nephropathy. Mice were administered a low-salt diet (0.01% sodium) for 1 wk followed by CsA treatment (30 mg/kg, subcutaneously, daily) for 4 wk. 1D11 was administered (2.5 mg/kg, intraperitoneally, 3 times/wk) beginning immediately after the termination of CsA dosing and continued through 8 wk. CsA caused extensive renal histopathologic alterations, including tubular damage, interstitial infiltrates and fibrosis, deposition of collagen III, and apoptosis of tubular epithelial cells. 1D11 ameliorated the CsA-induced histopathologic alterations, with significant reduction in collagen III expression and deposition. Additionally, elevated levels of mRNA encoding TGF-beta1 and TGF-beta2 were significantly reduced. 1D11 also protected tubular epithelial cells from apoptosis by 48% (P < 0.05). In contrast, 13C4 (a control antibody) had no significant effect on any of the endpoints described above. Importantly, the effects of 1D11 on the CsA-induced morphologic alterations were followed by a reduction in serum creatinine level when compared with CsA mice treated with 13C4 (13C4, 0.45 +/- 0.09; 1D11, 0.30 +/- 0.08; P < 0.05) after 8 wk of treatment. Endothelial nitric oxide synthase (eNOS), inducible NOS (iNOS), nitrotyrosine, and tissue hypoxia were examined by immunostaining using specific antibodies. eNOS was significantly reduced in the endothelium of arterioles in the kidneys of mice treated with CsA, whereas iNOS was induced in the cortical tubules. Tissue hypoxia was found in both the arterioles and tubules, whereas nitrotyrosine was localized in the tubules. Administration of 1D11 improved tissue hypoxia and reduced nitrotyrosine formation. Moreover, the reciprocal changes in iNOS and eNOS expression were normalized by 1D11. This study demonstrates that 1D11 administration ameliorated morphologic alterations and preserved renal function in the context of existing chronic CsA nephropathy.
ISSN:	1046-6673 1533-3450
DOI:	10.1097/01.ASN.0000042168.43665.9B