Targeted gene disruption reveals the role of cysteinyl leukotriene 1 receptor in the enhanced vascular permeability of mice undergoing acute inflammatory responses.

The Journal of Biological Chemistry
Akiko MaekawaYoshihide Kanaoka

Abstract

The cysteinyl leukotrienes (cysLTs), leukotriene (LT) C(4), LTD(4), and LTE(4), are proinflammatory lipid mediators generated in the mouse by hematopoietic cells such as macrophages and mast cells. There are two mouse receptors for the cysLTs, CysLT(1) receptor (CysLT(1)R) and CysLT(2)R, which are 38% homologous and are located on mouse chromosomes X and 14, respectively. To clarify the different roles of the CysLT(1)R and CysLT(2)R in inflammatory responses in vivo, we generated CysLT(1)R-deficient mice by targeted gene disruption. These mice developed normally and were fertile. In an intracellular calcium mobilization assay with fura-2 acetoxymethyl ester, peritoneal macrophages from wild-type littermates, which express both CysLT(1)R and CysLT(2)R, responded substantially to 1 x 10(-6) m LTD(4) and slightly to 1 x 10(-6) m LTC(4), whereas the macrophages from CysLT(1)R-deficient mice did not respond to either LTD(4) or LTC(4). Plasma protein extravasation, but not neutrophil infiltration, was significantly reduced in CysLT(1)R-deficient mice subjected to zymosan A-induced peritoneal inflammation. Plasma protein extravasation was also significantly diminished in CysLT(1)R-deficient mice undergoing IgE-mediated passive cutaneo...Continue Reading

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