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Gamma-tocotrienol Alters Protein Expression of HepG2 Cell Line

Original article

Abstrak

Gamma-tokotrienol (GTT) telah menunjukkan aktiviti antitumor yang signifikan terha­dap pelbagai sel tumor. Penemuan terdahulu menunjukkan bahawa GTT mempunyai kesan antiproliferasi terhadap sel kanser hepar (HepG2) pada nilai IC50 170 μM. Di dalam kajian ini, kaedah elektroforesis gel dua dimensi (2DE) digunakan bagi menge­tahui perubahan pada ekspresi protein di dalam sel HepG2 selepas rawatan GTT. Tu­juan utamanya adalah untuk mengenalpasti mekanisme molekul yang mungkin terlibat dalam aktiviti antitumor GTT. Penumpuan diberikan kepada penghasilan profil protein 2DE sel HepG2 dengan dan tanpa rawatan GTT. Analisis awal terhadap profil 2DE, menunjukkan terdapat 18 titik protein diekspreskan secara berlainan di dalam sel di­rawat GTT. Pemerhatian ini dipastikan dengan meluaskan lagi skop kajian kami ke­pada saiz sampel yang lebih besar. Dengan mengkaji kesan rawatan GTT kepada eks­presi protein di dalam sel HepG2, mekanisme asas yang terlibat pada sifat anti tu­mor secara diferensial GTT mungkin boleh dijelaskan.

Abstract

Gamma-tocotrienol (GTT) has been shown to exhibit significant antitumor activity in a variety of tumor cells. Previous findings have demonstrated that GTT had antiprolifera­tive effects on a liver cancer cell line (HepG2) with an IC50 value of 170μM. In this study, two dimensional gel electrophoresis (2DE) was used to determine changes in protein expression in HepG2 cell line following treatment with GTT. The ultimate aim is to identify the possible molecular mechanisms involved in GTT antitumor activity. This study is focused on obtaining a 2DE protein profile for HepG2 cell line with and without GTT treatment. In the preliminary analysis of the resulting 2DE profiles, 18 protein spots were found to be differentially expressed in cells treated with GTT. This observa­tion is confirmed by extending the analysis to a larger sample size. By studying the effects of GTT treatment on differential protein expression in HepG2 cells the underly­ing mechanisms involved in the antitumor activity of GTT may be elucidated.