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| 標題: | Human recombinant factor VIIa may improve heat intolerance in mice by attenuating hypothalamic neuronal apoptosis and damage |
| 作者: | Hsu, Chuan-Chih
Chen, Sheng-Hsien
Lin, Cheng-Hsien
Yung, Ming-Chi |
| 貢獻者: | 藥學系 |
| 關鍵字: | Human recombinant factor VIIa
Hypothalamus
Inflammation
Oxidative stress |
| 日期: | 2014-10 |
| 上傳時間: | 2015-05-06 21:21:52 (UTC+8) |
| 出版者: | Springer |
| 摘要: | Intolerance to heat exposure is believed to be associated with hypothalamo-pituitary-adrenocortical (HPA) axis impairment [reflected by decreases in blood concentrations of both adrenocorticotrophic-hormone (ACTH) and corticosterone]. The purpose of this study was to determine the effect of human recombinant factor VIIa (rfVIIa) on heat intolerance, HPA axis impairment, and hypothalamic inflammation, ischemic and oxidative damage, and apoptosis in mice under heat stress. Immediately after heat stress (41.2 A degrees C for 1 h), mice were treated with vehicle (1 mL/kg of body weight) or rfVIIa (65-270 A mu g/kg of body weight) and then returned to room temperature (26 A degrees C). Mice still alive on day 4 of heat exposure were considered survivors. Cellular ischemia markers (e.g., glutamate, lactate-to-pyruvate ratio), oxidative damage markers (e.g., nitric oxide metabolite, hydroxyl radials), and pro-inflammatory cytokines (e.g., interleukin-6, interleukin-1 beta, tumor necrosis factor-alpha) in hypothalamus were determined. In addition, blood concentrations of both ACTH and corticosterone were measured. Hypothalamic cell damage was assessed by determing the neuronal damage scores, whereas the hypothalamic cell apoptosis was determined by assessing the numbers of cells stained with terminal deoxynucleotidyl transferase-mediated alpha UTP nick-end labeling, caspase-3-positive cells, and platelet endothelial cell adhesion molecula-1-positive cells in hypothalamus. Compared with vehicle-treated heated mice, rfVIIa-treated heated mice had significantly higher fractional survival (8/10 vs 1/10), lesser thermoregulatory deficit (34.1 vs 24.8 A degrees C), lesser extents of ischemic, oxidative, and inflammatory markers in hypothalamus, lesser neuronal damage scores and apoptosis in hypothalamus, and lesser HPA axis impairment. Human recombinant factor VIIa appears to exert a protective effect against heatstroke by attenuating hypothalamic cell apoptosis (due to ischemic, inflammatory, and oxidative damage) in mice. |
| 關聯: | Apoptosis, v.19 n.10, pp.1484-1496 |
| 顯示於類別: | [藥學系(所)] 期刊論文
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