کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
2551853 1560684 2011 8 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Solamargine induces apoptosis associated with p53 transcription-dependent and transcription-independent pathways in human osteosarcoma U2OS cells
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موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی کاردیولوژی و پزشکی قلب و عروق
پیش نمایش صفحه اول مقاله
Solamargine induces apoptosis associated with p53 transcription-dependent and transcription-independent pathways in human osteosarcoma U2OS cells
چکیده انگلیسی

AimsSolamargine, a steroidal glycoalkaloid isolated from S. incanum, has been shown to induce apoptosis in several cancer cell lines. In this study, the involvement of p53 in the pro-apoptotic action of solamargine was investigated in human osteosarcoma U2OS cells.Main methodsThe cytotoxicity of solamargine was evaluated by MTT assay. Solamargine-induced apoptosis was evidenced by chromatin condensation, formation of apoptotic bodies and exposure of phosphatidylserine on the extracellular surface as revealed by DAPI nuclear staining, transmission electron microscopy and flow cytometry, respectively. mRNA expressions of p53 and Bax were investigated using real time-PCR. Western blot was used to examine the changes in the expression levels of p53, Bax, Bcl-2, caspase-3, caspase-9 and cytochrome c. Subcellular localization of p53 was verified by immunofluorescence staining and cell fractionation.Key findingsSolamargine substantially reduced cell viability and induced apoptosis in osteosarcoma U2OS cells. In this connection, solamargine increased the mRNA and protein expressions of p53 and Bax (a pro-apoptotic protein downstream to p53). The expression of Bcl-2 (an anti-apoptotic protein) was also reduced. Furthermore, solamargine induced mitochondrial translocation of p53, loss of mitochondrial membrane potential, cytochrome c release and activation of caspase-9 and -3. p53-specific transcriptional inhibitor pifithrin-α or mitochondrial translocation inhibitor pifithrin-μ partially reversed solamargine-induced apoptosis.SignificanceSolamargine activates the mitochondria-mediated apoptotic pathway in U2OS cells via both p53 transcription-dependent and -independent mechanisms. This compound may merit further investigation as a potential therapeutic agent for the treatment of cancer.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Life Sciences - Volume 88, Issues 7–8, 14 February 2011, Pages 314–321
نویسندگان
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