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자료유형
학술저널
저자정보
저널정보
한국독성학회 Toxicological Research Journal of Toxicology and Public Health Vol.15 No.2
발행연도
1999.6
수록면
117 - 122 (6page)

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The treatment of advanced cancers with paclitaxel (taxol) is hindered by the development of drug resistance. Resistance to taxol is known to be associated with multidrug resistance (MDR) and a mutation affecting either the α- or β-subunit of tubulin. In this study, we demonstrated that an intracellular cAMP level may also play an important role in resistance to taxol in HL-60, acute pro-myelocytic leukemia cells. Exposure of HL-60 cells to various doses of taxol for 18 hr resulted in cell death. However, pretreatment of the cells with cAMP analogs such as N6 : O2-dibutyl cAMP (Db- cAMP), 8-(4-chlorophenylthio) cAMP (CPT-cAMP) and 8-bromo-cAMP (8-Br-cAMP) or an intracellular cAMP elevating agent such as forskolin apparently rendered HL-60 cells more resistant to taxol, but not with dimethyl sulfoxide (DMSO) or retinoic acid (RA), well known differentiating agents. To investigate whether protein kinase A (PKA) activated by an increase in intracellular cAMP level could be involved in increased taxol resistance of the cells, we examined the effects of PKA inhibitors, including H-89 and KT5720, on taxol resistance induced by Db-cAMP. The PKA inhibitors significantly abolished Db-cAMP-induced taxol resistance. These results suggest that cAMP analogs may render tumor cells more resistant to taxol via PKA activation.

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ABSTRACT

Ⅰ. INTRODUCTION

Ⅱ. MATERIALS AND METHODS

Ⅲ. RESULTS

Ⅳ. DISCUSSION

ACKNOWLEDGEMENTS

REFERENCES

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