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2015 ; 6
(24
): 20555-69
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Jak3, STAT3, and STAT5 inhibit expression of miR-22, a novel tumor suppressor
microRNA, in cutaneous T-Cell lymphoma
#MMPMID26244872
Sibbesen NA
; Kopp KL
; Litvinov IV
; Jønson L
; Willerslev-Olsen A
; Fredholm S
; Petersen DL
; Nastasi C
; Krejsgaard T
; Lindahl LM
; Gniadecki R
; Mongan NP
; Sasseville D
; Wasik MA
; Iversen L
; Bonefeld CM
; Geisler C
; Woetmann A
; Odum N
Oncotarget
2015[Aug]; 6
(24
): 20555-69
PMID26244872
show ga
Aberrant activation of Janus kinase-3 (Jak3) and its key down-stream effectors,
Signal Transducer and Activator of Transcription-3 (STAT3) and STAT5, is a key
feature of malignant transformation in cutaneous T-cell lymphoma (CTCL). However,
it remains only partially understood how Jak3/STAT activation promotes
lymphomagenesis. Recently, non-coding microRNAs (miRNAs) have been implicated in
the pathogenesis of this malignancy. Here, we show that (i) malignant T cells
display a decreased expression of a tumor suppressor miRNA, miR-22, when compared
to non-malignant T cells, (ii) STAT5 binds the promoter of the miR-22 host gene,
and (iii) inhibition of Jak3, STAT3, and STAT5 triggers increased expression of
pri-miR-22 and miR-22. Curcumin, a nutrient with anti-Jak3 activity and histone
deacetylase inhibitors (HDACi) also trigger increased expression of pri-miR-22
and miR-22. Transfection of malignant T cells with recombinant miR-22 inhibits
the expression of validated miR-22 targets including NCoA1, a transcriptional
co-activator in others cancers, as well as HDAC6, MAX, MYCBP, PTEN, and CDK2,
which have all been implicated in CTCL pathogenesis. In conclusion, we provide
the first evidence that de-regulated Jak3/STAT3/STAT5 signalling in CTCL cells
represses the expression of the gene encoding miR-22, a novel tumor suppressor
miRNA.