Cysteinyl leukotriene receptor 2 is spatiotemporally involved in neuron injury, astrocytosis and microgliosis after focal cerebral ischemia in rats

• Published in: Neuroscience Vol. 189; pp. 1 - 11
• Main Authors: Zhao, C.Z, Zhao, B, Zhang, X.Y, Huang, X.Q, Shi, W.Z, Liu, H.L, Fang, S.H, Lu, Y.B, Zhang, W.P, Tang, F.D, Wei, E.Q
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 25.08.2011; Elsevier
• Subjects: Animals; astrocyte; Astrocytes; Astrocytes - metabolism; Astrocytes - pathology; Biological and medical sciences; Boundaries; Brain; Brain - metabolism; Brain - pathology; Brain injury; Cortex; cysteinyl leukotriene receptor; focal cerebral ischemia; Fundamental and applied biological sciences. Psychology; Gliosis; Infarction, Middle Cerebral Artery - complications; Inflammation; Injuries; Ischemia; Ischemic Attack, Transient - etiology; Ischemic Attack, Transient - metabolism; Ischemic Attack, Transient - pathology; Leukotrienes; Male; Medical sciences; Microglia; Microglia - metabolism; Microglia - pathology; Nervous system; Neurology; neuron; Neuronal-glial interactions; Neurons; Neurons - metabolism; Neurons - pathology; Rats; Rats, Sprague-Dawley; Receptors, Leukotriene - metabolism; Vascular diseases and vascular malformations of the nervous system; Vertebrates: nervous system and sense organs; MCAo; rCBF; neuron; neuronal nuclear antigen; Iba1; cysteinyl leukotriene receptor; OGD; oxygen-glucose deprivation; GFAP; CysLT 1 receptor; NeuN; ionized calcium binding adaptor molecule 1; cysteinyl leukotrienes; CysLT 2 receptor; regional cerebral blood flow; focal cerebral ischemia; astrocyte; microglia; CysLTs; glial fibrillary acidic protein; cysteinyl leukotriene receptor 2; middle cerebral artery occlusion; cysteinyl leukotriene receptor 1; CysLT1 receptor; CysLT2 receptor; Nervous system diseases; Rat; Leukotriene receptor; Neuroglia; Rodentia; Central nervous system; Cardiovascular disease; Astrocyte; Cerebral disorder; Encephalon; Microglia; Vascular disease; Vertebrata; Mammalia; Neuron; Animal; Central nervous system disease; Brain ischemia; Lesion; Cerebrovascular disease
• ISSN: 0306-4522; 1873-7544
• DOI: 10.1016/j.neuroscience.2011.05.066

Abstract Cysteinyl leukotrienes (CysLTs), potent inflammatory mediators, are released from ischemic brain, and may regulate ischemic injury through activating CysLT1 and CysLT2 receptors. The CysLT1 receptor is closely associated with ischemic injury and post-ischemic repair; however, the CysLT2 receptor-mediated responses remain unknown. Here, we investigated the spatiotemporal profiles and implications of CysLT2 receptor expression and localization in rat brain after focal cerebral ischemia. CysLT2 receptors were normally localized in astrocytes in the cortex and around the ventricles. After focal cerebral ischemia, CysLT2 receptor expression was up-regulated in concert with neuronal and glial responses. In the acute phase (6–24 h), up-regulated CysLT2 receptors were restricted to injured neurons in the ischemic core; while in the late phase (3–28 days), the up-regulation was restricted to hypertrophic microglia (ischemic core) and mainly localized in hypertrophic astrocytes (boundary zone). Thus, the spatiotemporal profiles of CysLT2 receptor expression suggest that it plays regulatory roles in acute neuron injury, and astrocytosis and microgliosis in the late phase.