Cysteinyl leukotriene receptor 1 partially mediates brain cryoinjury in mice

Abstract

Aim: To determine whether the cysteinyl leukotriene receptor 1 (CysLT 1 receptor) modulates brain cryoinjury and whether the CysLT 1 receptor antagonist pranlukast exerts a time-dependent protective effect on cryoinjury in mice. Methods: Brain cryoinjury was induced by applying a liquid nitrogen-cooled metal probe to the surface of the skull for 30 s. Brain lesion, neuron density, and endogenous IgG exudation were observed 24 h after cryoinjury. Transcription and the expresion of the CysLT1 receptor were detected by RT-PCR and immunoblotting, and the localization of the receptor protein by double immunofluorescence. Results: The mRNA and protein expressions of the CysLT1 receptor were upregulated in the brain 6-24 h after cryoinjury, and the CysLT1 receptor protein was primarily localized in the neurons, not in the neurons, not in the astrocytes or microglia. Pre-injury treatments with multi-doses and a single dose of pranlukast (0.1 mg/kg) attenuated cryoinjury, postinjury single dose (0.1 mg/kg) at 30 min (not 1 h) after cryoinjury was also effective. Conclusion: The CysLT1 receptor modulates cryoinjury in mice at least partly, and postinjury treatment with its antagonist pranlukast exerts the protective effect with a therapeutic window of 30 min. © 2007 CPS and SIMM.