JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Proteomic analysis to dissect mitoxantrone resistance-associated proteins in a squamous lung carcinoma.

BACKGROUND: Mitoxantrone resistance has been related to the expression of a drug efflux pump breast cancer resistance pump (BCRP) but little is known of the intracellular protein changes. In this work, differential protein expression in a squamous lung carcinoma cell line, DLKP, and its mitoxantrone-resistant variant (DLKP-Mitox) was investigated to elucidate other changes associated with mitoxantrone resistance.

MATERIALS AND METHODS: Differential protein expression between DLKP and DLKP-Mitox was investigated using 2D-DIGE technology. Proteins of interest were identified by MALDI-ToF mass spectrometry. Western blotting was used to confirm and validate some of these changes.

RESULTS: Biological variation analysis in Decyder software revealed a total of 343 proteins to be differentially regulated with p < 0.05. Identification of 61 proteins of interest by mass spectrometry revealed changes in proteins involved in many cellular processes including apoptosis and differentiation.

CONCLUSION: Alterations in these cellular processes and proteins present alternative sites to circumvent resistance to mitoxantrone.

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