Glial reactivity in resistance to methamphetamine-induced neurotoxicity.

Glial reactivity in resistance to methamphetamine-induced neurotoxicity.
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DOI:
10.1111/jnc.12201
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发表时间:
2013-05
影响因子:
4.7
通讯作者:
Keefe KA
Keefe KA
中科院分区:
医学2区
文献类型:
--
作者:
Friend DM;Keefe KA

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甲基苯丙胺(METH)的神经毒性疗法会导致纹状体中的小胶质细胞和星形胶质细胞发生反应。先前的数据表明,因先前接触 METH 导致多巴胺 (DA) 部分丧失的大鼠在 30 天后再次接触 METH 时,能够抵抗纹状体 DA 的进一步下降。这种耐药动物也没有表现出激活的小胶质细胞表型,这表明小胶质细胞激活与冰毒诱导的神经毒性之间存在关系。迄今为止,尚未检查星形胶质细胞在这种抵抗中的反应。因此,本研究检测了在出生后 60 天和/或 90 天给予盐水或 METH 神经毒性方案(盐水:盐水、盐水:METH、METH:盐水、METH:METH)的动物纹状体中神经胶质原纤维酸性蛋白(GFAP)和 CD11b 蛋白的表达。与之前的工作一致,经历急性毒性(盐水:METH)的动物显示出活化的小胶质细胞和星形细胞,而那些对急性毒性(METH:METH)具有抵抗力的动物则没有表现出活化的小胶质细胞。有趣的是,在 PND60 暴露于 METH(METH:盐水)的大鼠中,GFAP 表达仍然升高,而在第二次用 METH(METH:METH)治疗的耐药大鼠中,GFAP 表达没有进一步升高。这些数据表明星形胶质细胞在接触冰毒后长达 30 天仍保持反应性。此外,这些数据表明星形胶质细胞反应性并不反映急性 METH 诱导的 DA 末端毒性,而小胶质细胞反应性则相反。
Neurotoxic regimens of methamphetamine (METH) result in reactive microglia and astrocytes in striatum. Prior data indicate that rats with partial dopamine (DA) loss resulting from prior exposure to METH are resistant to further decreases in striatal DA when re-exposed to METH 30 days later. Such resistant animals also do not show an activated microglia phenotype, suggesting a relation between microglial activation and METH-induced neurotoxicity. To date, the astrocyte response in such resistance has not been examined. Thus, this study examined glial-fibrillary acidic protein (GFAP) and CD11b protein expression in striata of animals administered saline or a neurotoxic regimen of METH on postnatal days 60 and/or 90 (Saline:Saline, Saline:METH, METH:Saline, METH:METH). Consistent with previous work, animals experiencing acute toxicity (Saline:METH) showed both activated microglia and astocytes, whereas those resistant to the acute toxicity (METH:METH) did not show activated microglia. Interestingly, GFAP expression remained elevated in rats exposed to METH at PND60 (METH:Saline), and was not elevated further in resistant rats treated for the second time with METH (METH:METH). These data suggest that astrocytes remain reactive up to 30 days post-METH exposure. Additionally, these data indicate that astrocyte reactivity does not reflect acute, METH-induced DA terminal toxicity, whereas microglial reactivity does.
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