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C-Jun N-terminal Kinase 2 (JNK2) Antagonizes the Signaling of Differentiation by JNK1 in Human Myeloid Leukemia Cells Resistant to Vitamin D

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Journal Leuk Res
Date 2009 Apr 3
PMID 19339050
Citations 16
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Abstract

1,25-Dihydroxyvitamin D3 (1,25D) induces differentiation of myeloid leukemia cells, but resistant cells are also encountered. We studied the mechanistic basis for the resistance in a model system using enhancers of 1,25D, the antioxidant carnosic acid and a kinase inhibitor SB202190. Knock-down (KD) of JNK2p54 unexpectedly increased the intensity of differentiation induced by the 1,25D, carnosic acid and SB202190 (DCS) combination. This was associated with upregulation of activated JNK1p46, and the transcription factors regulated by the JNK pathway, c-Jun, ATF2 and JunB, as well as C/EBP beta. In contrast, KD of JNK1p46 reduced the intensity of DCS-induced differentiation, and partially abrogated activation of c-Jun/AP-1 transcription factors.

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