Targeting the 90 kDa heat shock protein improves photodynamic therapy.

Targeting the 90 kDa heat shock protein improves photodynamic therapy.
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DOI:
10.1016/j.canlet.2009.08.015
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发表时间:
2010-03-28
期刊:
影响因子:
9.7
通讯作者:
Gomer, Charles J.
Gomer, Charles J.
中科院分区:
医学1区
文献类型:
--
作者:
Ferrario, Angela;Gomer, Charles J.

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格尔德霉素衍生物,17-烯丙基氨基-17-去甲氧基格尔德霉素(17-AAG),与90 kDa热休克蛋白(Hsp-90)的氨基末端ATP结合口袋结合,并抑制该分子伴侣稳定与恶性表型相关的客户蛋白。我们研究了涉及光动力疗法(PDT)和17-AAG在小鼠乳腺癌细胞和肿瘤中的联合治疗方案的效果。PDT增加了肿瘤组织中抗凋亡和促血管生成蛋白生存素、Akt、HIF-1α、MMP-2和VEGF的表达,当治疗方案中包含17-AAG时,这种表达显着降低。与单独的治疗方案相比,PDT和17-AAG治疗的荷瘤小鼠具有改善的长期杀肿瘤反应。我们的结论是,热休克蛋白-90在调节肿瘤的反应后PDT和17-AAG靶向热休克蛋白-90增强PDT的治疗效果起着积极的作用。
The geldanamycin derivative, 17-allylamino-17-demethoxygeldanamycin (17-AAG), binds to the amino-terminal ATP binding pocket of the 90 kDa heat shock protein (Hsp-90) and inhibits this chaperone from stabilizing client proteins involved with the malignant phenotype. We examined the effects of a combined modality protocol involving photodynamic therapy (PDT) and 17-AAG in mouse mammary carcinoma cells and tumors. PDT increased the expression of the anti-apoptotic and pro-angiogenic proteins survivin, Akt, HIF-1α, MMP-2 and VEGF in tumor tissue and this expression decreased significantly when 17-AAG was included in the treatment regimen. Tumor bearing mice treated with PDT and 17-AAG had improved long-term tumoricidal responses when compared with individual treatment protocols. We conclude that Hsp-90 plays an active role in modulating tumor responsiveness following PDT and targeting Hsp-90 with 17-AAG enhances the therapeutic effectiveness of PDT.
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