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Differential Activation of NF-B, AP-1, and C/EBP in Endotoxin-Tolerant Rats: Mechanisms for In Vivo Regulation of Glomerular RANTES/CCL5 Expression¹

Johanna Pocock^*, Carmen Gómez-Guerrero, Sigrid Harendza^*, Murwan Ayoub^*, Purificación Hernández-Vargas, Gunther Zahner^*, Rolf A. K. Stahl^* and Friedrich Thaiss^2,*

^* Department of Internal Medicine, Division of Nephrology and Osteology, University of Hamburg, Hamburg, Germany; and Renal and Vascular Research Laboratory, Fundación Jiménez Díaz, Autonoma University, Madrid, Spain

Chemokines play a pivotal role in the regulation of inflammatory cell infiltration in glomerular immune injury. To characterize mechanisms relevant for the regulation of chemokine expression in vivo, the LPS-mediated model of renal inflammation in rats was used in which we have previously demonstrated that the chemokine RANTES/CCL5 is expressed and secreted in glomeruli. Glomerular RANTES/CCL5 expression in this model correlated with an increased glomerular binding activity of the transcription factors AP-1, C/EBP, and NF-B. To gain further insight into the functional roles of these transcription factors in the regulation of glomerular RANTES/CCL5 expression, we cloned the rat RANTES/CCL5 promoter and established the model of in vivo LPS tolerance. In tolerant rats, LPS-induced glomerular RANTES/CCL5 expression and activation of the transcription factors AP-1 and C/EBP were significantly reduced using both consensus and rat RANTES/CCL5-specific oligonucleotides. Reduced glomerular NF-B binding activity after LPS injection could be demonstrated in tolerant rats only when using rat RANTES/CCL5-specific oligonucleotides. Reduced binding activity to this RANTES/CCL5-specific NF-B binding site in the context of broad NF-B activation might be due to changes in transcription factor interactions or chromatin remodeling processes.

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