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• W2094849897 abstract "In the present study the role of endothelin (ET) and its receptors (ETA-R and ETB-R) in cellular mechanisms underlying the resistance of astroglial cells to low oxygen level and development of hypoxia has been investigated. To define the influences of ET and its receptors on survival and on antigenic as well as morphologic differentiation of rat astroglial cells in normoxic (NC) and hypoxic culture (HC) the selective antagonists of ETA-R (BQ-123) and ETB-R (BQ-788) were used. Treatment of HC with BQ-123 caused an increase in cell number and inhibited the hypoxia-induced apoptosis by 37%. BQ-123 decreased the hypoxia-induced cytotoxicity in HC. These effects of BQ-123 were abolished in cultures simultaneously treated with BQ-123 and BQ-788. Administration of BQ-788 alone decreased the number of living cells in NC, but not in HC. The activity of caspase-3/-7 was not changed by exposure of NC and HC to BQ-788. The protection provided by BQ-123 to astroglial cells against cytotoxicity in NC and HC was similar to that of erythropoietin (EPO), a cytokine with established neuroprotective effects. The functional improvement of astroglial cells and slowing down of their differentiation under exposure to BQ-123, or EPO, or BQ-123+EPO has been evidenced by an increased number of nestin+/glial fibrillary acidic protein-positive (GFAP+) astrocytes accompanied by decrease of nestin−/GFAP+ cells. The simultaneous treatment with BQ-123 and EPO additionally decreased the activities of caspase-3/-7 (64%) and release of LDH into the medium (94%). The benefits in the functional states of astrocytes obtained by combined treatment of HC with BQ-123 and EPO suggest a new therapeutic strategy in treatment of hypoxic brain injury." @default.
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• W2094849897 date "2005-06-01" @default.
• W2094849897 modified "2023-09-23" @default.
• W2094849897 title "The blockade of endothelin A receptor protects astrocytes against hypoxic injury: Common effects of BQ-123 and erythropoietin on the rejuvenation of the astrocyte population" @default.
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• W2094849897 doi "https://doi.org/10.1016/j.ejcb.2004.12.030" @default.
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