The Leptospira outer membrane protein LipL32 induces tubulointerstitial nephritis-mediated gene expression in mouse proximal tubule cells.
Tubulointerstitial nephritis is a main renal manifestation caused by pathogenic leptospira that accumulate mostly in the proximal tubules, thereby inducing tubular injury and tubulointerstitial nephritis. To elucidate the role of leptospira outer membrane proteins in tubulointerstitial nephritis, outer membrane proteins from pathogenic Leptospira shermani and nonpathogenic Leptospira patoc extracted by Triton X-114 were administered to cultured mouse proximal tubule cells. A dose-dependent increase of monocyte chemoattractant protein-1 (MCP-1), RANTES, nitrite, and tumor necrosis factor-alpha (TNF-alpha) in the culture supernatant was observed 48 h after incubating Leptospira shermani outer membrane proteins with mouse proximal tubule cells. RT competitive-PCR experiments showed that Leptospira shermani outer membrane proteins (0.2 microg/ml) increased the expression of MCP-1, nitric oxide synthase (iNOS), RANTES, and TNF-alpha mRNA by 3.0-, 9.4-, 2.5-, and 2.5-fold, respectively, when compared with untreated cells. Outer membrane proteins extract from avirulent Leptospira patoc did not induce significant effects. The pathogenic outer membrane proteins extract contain a major component of a 32-kD lipoprotein (LipL32), which is absent in the nonpathogenic leptospira outer membrane. An antibody raised against LipL32 prevented the stimulatory effect of Leptospira shermani outer membrane proteins extract on MCP-1 and iNOS mRNA expression in cultured proximal tubule cells, whereas recombinant LipL32 significantly stimulated the expression of MCP-1 and iNOS mRNAs and augmented nuclear binding of nuclear factor-kappaB (NF-kappaB) and AP-1 transcription factors in proximal tubule cells. An antibody raised against LipL32 also blunted the effects induced by the recombinant LipL32. This study demonstrates that LipL32 is a major component of pathogenic leptospira outer membrane proteins involved in the pathogenesis of tubulointerstitial nephritis.
Department of Nephrology, Chang Gung Memorial Hospital, Taipei, Taiwan, Republic of China. cwyang@ms1.hinet.net
Chih-Wei
CW
Yang
Mai-Szu
MS
Wu
Ming-Jeng
MJ
Pan
Wang-Ju
WJ
Hsieh
Alain
A
Vandewalle
Chiu-Ching
CC
Huang
D000818:Animals; D000906:Antibodies / Q000494:pharmacology; D001425:Bacterial Outer Membrane Proteins / Q000032:analysis / Q000276:immunology / Q000494:pharmacology*; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects; D004247:DNA / Q000378:metabolism; D015870:Gene Expression / Q000187:drug effects*; D007687:Kidney Tubules, Proximal / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology*; D007919:Leptospira / Q000737:chemistry; D008074:Lipoproteins / Q000032:analysis / Q000276:immunology / Q000494:pharmacology*; D051379:Mice; D016328:NF-kappa B / Q000378:metabolism; D009395:Nephritis, Interstitial / Q000235:genetics* / Q000473:pathology / Q000503:physiopathology; D011994:Recombinant Proteins / Q000276:immunology; D018808:Transcription Factor AP-1 / Q000378:metabolism
D000906:Antibodies; D001425:Bacterial Outer Membrane Proteins; C406589:LipL32 protein, Leptospira; D008074:Lipoproteins; D016328:NF-kappa B; D011994:Recombinant Proteins; D018808:Transcription Factor AP-1; D004247:DNA