CXC and CC chemokines induced in human renal epithelial cells by inflammatory cytokines
2009
Human renal epithelial cells might play an important role during the allograft rejection by producing
chemokinesin response to
proinflammatory cytokinessuch as tumor necrosis factor (TNF)-α and interleukin (IL)-1β produced by endothelial and epithelial cells early after transplantation. The production of
chemokinesallows inflammatory cells to be drawn into the kidney graft and therefore plays a critical role in the pathophysiologic processes that lead to the rejection of renal transplant. In this process, two
chemokinesuperfamilies, the CC and the CXC
chemokines, are the most important. The
CC chemokinestarget mainly monocytes and T lymphocytes, while most of the CXC
chemokinesattract neutrophils. We showed in our study that in vitro, in unstimulated cells, basal mRNA expression of CXC
chemokines(Groα, Groβ, Groy, ENA-78 and GCP-2, IL-8) that attract neutrophils was detectable and expression of these genes and
chemokinerelease were increased in TNF-α- and IL-1β-induced renal epithelial cells. Most of the
CC chemokines[monocyte chemotactic protein-1 (MCP-1),
macrophage inflammatory protein1 beta (MIP-1β), regulated upon activation, normal T cell expressed and secreted (RANTES) and
macrophage inflammatory protein(MIP-3α)] showed detectable mRNA expression only after stimulation with
proinflammatory cytokinesand not in control cells. TNF-α seems to induce preferably the expression of RANTES, MCP-1, interferon-inducible protein (IP-10) and Interferon-Inducible T-cell Alpha Chemoattractant (I-TAC), while IL-Iβ induces mainly IL-8 and epithelial neutrophil-activating peptide 78 (ENA-78).
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