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The antitumor mechanisms of adriamycin (ADR) have been thought to contribute to induction of apoptosis and inefficiency of DNA repair, processes that are to a large extent mediated by mitochondria. This study aimed to investigate characteristics of ADR, including its antineoplastic activity, drug resistance, and unexpected toxicity in non-Hodgkin lymphoma (NHL) Raji cells at the mitochondrial proteomic level. The alterations of the mitochondrial proteome of Raji cells treated with ADR were analyzed by two-dimensional differential in-gel electrophoresis (2D-DIGE) coupled with linear ion trap quadrupole-electrospray ionization tandem mass spectrometry (LTQ-ESI-MS/MS).The altered patterns of three identified proteins were validated by Western blot and analyzed by pathway studio software. The results showed that 34 proteins were downregulated and 3 proteins upregulated in the study group compared with the control group. The differentially expressed proteins distributed their functions in reduction-oxidation reactions, DNA repair, cell cycle regulation, transporters and channels, and oxidative phosphorylation. Furthermore, heat shock protein 70 (HSP70), ATP-binding cassette transporter isoform B6 (ABCB6), and prohibitin (PHB) identified in this study may be closely related to chemoresistance and could serve as potential chemotherapeutic targets for NHL. Collectively, these results suggest that specific mitochondrial proteins are uniquely susceptible to alterations in abundance following exposure to ADR and carry implications for the investigation of therapeutic and prognostic markers. Further studies focusing on these identified proteins will be used to predict treatment response and reverse apoptosis resistance,and to explore drug-combination strategies associated with ADR for NHL therapy.

Comparative Mitochondrial Proteomic Analysis of Raji Cells Exposed to Adriamycin