AAS ›› 2015, Vol. 46 ›› Issue (1): 72-80.doi: 10.16098/j.issn.0529-1356.2015.01.013

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Regulatory mechanism of prohibitin in human osteosarcoma MG-63 cells during apoptosis induced by curcumin

SHI Song-lin1 ZHAO Zhen-li2 WANG Guo-hong3 LIU Fan1 LU Kun1 YANG Ling1 HAN Rong1 LI Xiao1 LI Qi-fu 1*   

  1. 1. Department of Basic Medical Sciences,Medical College of Xiamen University, Fujian Xiamen 361102, China;2. Department of Forestry, Forestry College of He’nan Agricultural University,Zhenghou 450002,China;3. Department of Basic Medical Sciences,Xingxiang Medical College,He’nan Xingxiang 453003, China
  • Received:2014-06-26 Revised:2014-09-11 Online:2015-02-06 Published:2015-02-06
  • Contact: LI Qi-fu E-mail:shisonglin@xmu.edu.cn

Abstract:

Objective To investigate the expression and distribution of prohibitin in cellular nuclear matrix and the co-localization between prohibitin and the products of apoptosis-related genes in human osteosarcoma MG-63 cell before and after curcumin treatment. Methods Nuclear matrix proteins were selectively extracted and subjected to two-dimensional gel electrophoresis analysis, immunoblotting, and microscopy. Results Two-dimensional polyacrylamide Gel electrophoresis and mass spectrum analysis showed that prohibitin existed in the nuclear matrix protein components of the MG-63 cell and its expression were down-regulated by curcumin. The change of prohibitin was further confirmed by immunoblotting. The immunofluorescence microscopy observation demonstrated that the prohibitin located in the filaments of the nuclear matrix of MG-63 cell and its distribution and expression were altered after curcumin treatment. Laser scanning confocal microscopy revealed that there were co-localization between prohibitin and the products of Bax, Bcl-2, Fas, P53, c-Myc, and Rb genes in MG-63 cell, and the site of co-localization was altered by curcumin treatment. Couclusion Current research identifiys that prohibitin is a nuclear matrix protein existing in the nuclear matrix. The alteration of expression and distribution of prohibitin, and the relationship between prohibitin and multiple apoptosis-related genes may play a pivotal role in the process of human osteosarcoma MG-63 cell apoptosis. These results contribute to the elucidation of the regulatory mechanisms of tumor cellular apoptosis.

 

Key words: Prohibitin, Nuclear matrix, Human osteosarcoma MG-63 cell, Curcumin