2,3,7,8-Tetrachlorodibenzo-p-dioxin induces apoptotic cell death and cytochrome P4501A expression in developing Fundulus heteroclitus embryos.

2,3,7,8-Tetrachlorodibenzo-p-dioxin induces apoptotic cell death and cytochrome P4501A expression in developing Fundulus heteroclitus embryos.
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2,3,7,8-四氯二苯并-p-二恶英在发育中的异斜眼底胚胎中诱导细胞凋亡和细胞色素 P4501A 表达。

DOI:
10.1016/s0166-445x(00)00161-2
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发表时间:
2001
期刊:
Aquatic toxicology (Amsterdam, Netherlands)
影响因子:
--
通讯作者:
DiGiulio,RT
DiGiulio,RT
中科院分区:
--
文献类型:
--
作者:
Toomey,BH;Bello,S;Hahn,ME;Cantrell,S;Wright,P;Tillitt,DE;DiGiulio,RT

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在早期发育过程中,使用纳米注射或水浴暴露将眼底异斜胚胎暴露于 2,3,7,8-四氯二苯并-p-二恶英 (TCDD)。 TCDD 会导致发育异常,包括出血、血管完整性丧失、水肿、发育迟缓和死亡。 TCDD 对眼底胚胎的 LC50 和 LD50 分别为 ∼19.7±9.5 pg TCDD/μl(水浴)和 0.25±0.09 ng TCDD/g 胚胎(纳米注射)。为了确定这些发育异常的可能原因,我们分析了 TCDD 对细胞凋亡和胚胎中细胞色素 P4501A (CYP1A) 表达的影响。 TCDD 暴露增加了多种组织中的细胞凋亡,包括脑、眼、鳃、肾、尾、肠、心脏和血管组织。暴露于 TCDD 的胚胎中 CYP1A 表达也增加,主要在肝脏、肾脏、鳃、心脏、肠和整个胚胎的血管组织中。在某些(但不是全部)细胞类型中,TCDD 诱导的细胞凋亡和 CYP1A 表达同时发生。此外,细胞凋亡和死亡率的剂量反应关系相似,而 CYP1A 表达似乎对 TCDD 诱导更敏感。
Fundulus heteroclitus embryos were exposed to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) during early development using nanoinjection or water bath exposure. TCDD caused developmental abnormalities that included hemorrhaging, loss of vascular integrity, edema, stunted development and death. The LC50and LD50of TCDD for Fundulus embryos were ∼19.7±9.5 pg TCDD/μl (water bath) and 0.25±0.09 ng TCDD/g embryo (nanoinjection). To identify a possible cause for these developmental abnormalities we analyzed the effects of TCDD on apoptotic cell death and cytochrome P4501A (CYP1A) expression in the embryos. TCDD exposure increased apoptotic cell death in several tissues including brain, eye, gill, kidney, tail, intestine, heart, and vascular tissue. CYP1A expression was also increased in the TCDD-exposed embryos predominantly in liver, kidney, gill, heart, intestine, and in vascular tissues throughout the embryo. There was co-occurrence of TCDD-induced apoptosis and CYP1A expression in some, but not all, cell types. In addition the dose response relationships for apoptosis and mortality were similar, while CYP1A expression appeared more sensitive to TCDD induction.
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