Abstract
BACKGROUND--Recruitment of inflammatory cells in the lungs may contribute to tissue injury as a result of mediators released from these cells. Interleukin 1 beta (IL-1 beta) is a potent inducer of neutrophil accumulation, a process that may require local protein biosynthesis. Macrophage inflammatory protein 2 (MIP-2) is a approximately 6 kD heparin binding protein and is a member of the C-X-C superfamily that causes significant neutrophil chemotaxis and activation in vitro. A study was performed to determine whether IL-1 beta could induce the expression of MIP-2 in the lungs of Brown-Norway rats. METHODS--rhIL-1 beta (500 U) or 0.9% NaCl was injected intratracheally and bronchoalveolar lavage (BAL) cells and lung tissues were evaluated for MIP-2 mRNA expression after RNA extraction by Northern blot analysis. MIP-2 probe was prepared from cDNA obtained by reverse transcriptase-polymerase chain reaction (RT-PCR) of BAL cells obtained from a rat treated with lipopolysaccharide. RESULTS--There was no detectable MIP-2 mRNA in the lungs of control rats but a marked enhancement of the expression at four hours with no expression at 12 hours and a slight expression at 24 hours. IL-1 beta induced a significant influx of neutrophils into BAL fluid with a transient increase in macrophages. In situ hybridisation of lungs using MIP-2 cDNA probe labelled with digoxigenin showed expression of MIP-2 mRNA in airway mononuclear cells and airway epithelium at four hours after IL-1 beta; at 24 hours the signal had nearly gone. CONCLUSION--IL-1 beta induces the expression of MIP-2 mRNA in rat lung. MIP-2 may be one chemokine that could contribute to IL-1 beta induced neutrophil influx.
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