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NDT Advance Access published online on May 12, 2008
Nephrology Dialysis Transplantation, doi:10.1093/ndt/gfn247
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© The Author [2008]. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org


HO-1 induction ameliorates experimental murine membranous nephropathy: anti-oxidative, anti-apoptotic and immunomodulatory effects

Chia-Chao Wu1, Kuo-Cheng Lu2, Jin-Shuen Chen1, Hsin-Yi Hsieh1, Shih-Hua Lin1, Pauling Chu1, Jia-Yi Wang3, Huey-Kang Sytwu4 and Yuh-Feng Lin1

1 Division of Nephrology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center 2 Division of Nephrology, Department of Medicine, Cardinal Tien Hospital, Fu-Jen Catholic University, School of Medicine 3 Department of Physiology 4 Department of Microbiology and Immunology, National Defense Medical Center, Taipei, Taiwan

Correspondence and offprint requests to: Dr Yuh-Feng Lin, Division of Nephrology, Department of Medicine, Tri-Service General Hospital, or Dr Huey-Kang Sytwu, Department of Microbiology and Immunology, National Defense Medical Center, 325, Cheng-Kung Road, Section 2, Nei-Hu, Taipei 114, Taiwan. E-mail: linyf{at}ndmctsgh.edu.tw; sytwu{at}ndmctsgh.edu.tw



  Abstract

Background. Therapeutic agents for membranous nephropathy (MN) remain ill-defined. Haeme oxygenase (HO)-1 is considered to play a protective role in various disorders. Here, we assessed the efficacy of HO-1 induction therapy for MN.

Methods. MN was induced in BALB/c mice with intravenous injections of cationic bovine serum albumin. Three groups of mice were administered 100 µmol/kg Cobalt protoporphyrin (CoPP, a potent HO-1 inducer), Tin protoporphyrin (SnPP, a potent HO-1 inhibitor) or phosphate-buffered saline via intra-peritoneal injections once a week starting from the induction of MN. Disease severity was verified by serum and urine metabolic profiles and by renal histopathology. Cytokine profiles, immunoglobulin production, the expression of oxidative stress markers (thiobarbituric acid reactive substances, TBARS) and apoptosis, as measured by TUNEL, were also determined.

Results. Mice treated with CoPP displayed a significant reduction in proteinuria and a marked amelioration of glomerular lesions, accompanied by attenuated immune-complex deposition. The production of immunoglobulins in MN mice treated with CoPP was significantly reduced compared with that of mice in the other two groups. TBARS in the serum and kidneys, as well as apoptosis, were also significantly reduced in CoPP-treated mice. Cytokine mRNA expression in the renal cortex indicated that CoPP not only decreased the expression of proinflammatory cytokines, but also increased the expression of anti-inflammatory cytokines (interleukin-10).

Conclusions. HO-1 induction therapy may ameliorate experimental MN via multiple pathways, including anti-oxidative, anti-apoptotic and immunomodulatory effects. HO-1 inducing regimens should be considered as a potential therapeutic intervention in MN in the future.

Keywords: apoptosis; haeme oxygenase-1; immunomodulatory; membranous nephropathy; oxidative stress

Received for publication: 7. 5.07
Accepted in revised form: 10. 4.08


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