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白藜芦醇可防止雷帕霉素诱导的自噬上调,并选择性地诱导结节性硬化症复合物2(TSC2)缺陷细胞凋亡。

Resveratrol prevents rapamycin-induced upregulation of autophagy and selectively induces apoptosis in TSC2-deficient cells.

作者信息

Alayev Anya, Sun Yang, Snyder Rose B, Berger Sara Malka, Yu Jane J, Holz Marina K

机构信息

Department of Biology; Stern College for Women of Yeshiva University; New York, NY USA.

Brigham and Women's Hospital and Harvard Medical School; Boston, MA USA.

出版信息

Cell Cycle. 2014;13(3):371-82. doi: 10.4161/cc.27355. Epub 2013 Dec 4.

Abstract

The mammalian/mechanistic target of rapamycin complex 1 (mTORC1) signaling pathway is hyperactivated in a variety of cancers and disorders, including lymphangioleiomyomatosis (LAM) and tuberous sclerosis complex (TSC), which are characterized by mutations in tumor suppressors TSC1 or TSC2. The concern with the use of mTORC1 inhibitors, such as rapamycin or its analogs (rapalogs), is that they cause upregulation of autophagy and suppress the negative feedback loop to Akt, which promotes cell survival, causing the therapy to be only partially effective, and relapse occurs upon cessation of treatment. In this study, we investigate the use of rapamycin in combination with resveratrol, a naturally occurring polyphenol, in TSC2-deficient cells. We tested whether such combination would prevent rapamycin-induced upregulation of autophagy and shift the cell fate toward apoptosis. We found that this combination treatment blocked rapamycin-induced upregulation of autophagy and restored inhibition of Akt. Interestingly, the combination of rapamycin and resveratrol selectively promoted apoptosis of TSC2-deficient cells. Thus, the addition of resveratrol to rapamycin treatment may be a promising option for selective and targeted therapy for diseases with TSC loss and mTORC1 hyperactivation.

摘要

雷帕霉素复合物1(mTORC1)信号通路在包括淋巴管平滑肌瘤病(LAM)和结节性硬化症复合物(TSC)在内的多种癌症和疾病中过度激活,这些疾病的特征是肿瘤抑制因子TSC1或TSC2发生突变。使用mTORC1抑制剂(如雷帕霉素或其类似物(雷帕霉素类似物))的问题在于,它们会导致自噬上调并抑制对Akt的负反馈回路,从而促进细胞存活,导致治疗仅部分有效,且停药后会复发。在本研究中,我们研究了雷帕霉素与天然存在的多酚白藜芦醇联合用于TSC2缺陷细胞的情况。我们测试了这种联合用药是否能防止雷帕霉素诱导的自噬上调,并使细胞命运转向凋亡。我们发现这种联合治疗阻断了雷帕霉素诱导的自噬上调,并恢复了对Akt的抑制。有趣的是,雷帕霉素和白藜芦醇的联合用药选择性地促进了TSC2缺陷细胞的凋亡。因此,在雷帕霉素治疗中添加白藜芦醇可能是针对TSC缺失和mTORC1过度激活疾病进行选择性和靶向治疗的一个有前景的选择。

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