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Death of multiple myeloma cells induced by cAMP-signaling involves downregulation of Mcl-1 via the JAK/STAT pathway

Follin-Arbelet, V.; Torgersen, M.L.; Naderi, E.H.; Misund, K.; Sundan, A.; Blomhoff, H.K.

Cancer Letters 335(2): 323-331

2013

ISSN/ISBN: 1872-7980
PMID: 23454584
DOI: 10.1016/j.canlet.2013.02.042
Accession: 036910393
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There is a continuous search for new therapeutic targets for treatment of multiple myeloma (MM). Here we investigated the mechanisms involved in cAMP-induced apoptosis of human MM cells. cAMP-increasing agents rapidly inhibited activation of JAK1 and its substrate STAT3. In line with STAT3 being a regulator of Mcl-1 transcription, the expression of this pro-survival factor was rapidly and selectively reduced. Notably, exogenous interleukin-6 neither prevented the inhibition of JAK1/STAT3 nor the death of MM cells induced by cAMP. Our results suggest that cAMP-mediated killing of MM cells involves inhibition of the JAK/STAT pathway, making the cAMP-pathway a promising target for treatment of MM.

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