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Deregulation in STAT signaling is important for cutaneous T-cell lymphoma (CTCL) pathogenesis and cancer progression

delete2014-10-29
delete132
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OA
AI
E
Elena Netchiporouk
I
Ivan V. Litvinov
L
Linda Moreau
M
Martin Gilbert
D
Denis Sasseville
M
Madeleine Duvic *
DOI:10.4161/15384101.2014.965061delete
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Abstract

Abstract

En 中文
Deregulation of STAT signaling has been implicated in the pathogenesis for a variety of cancers, including CTCL. Constitutive activation of STAT5 and STAT3 was observed in early and late stages of CTCL, respectively. In early stages, IL-2, IL-7 and IL-15 signaling via JAK1 and JAK3 kinases is believed to be responsible for activating STAT5, while in advanced stages development of IL-21 autocrine signaling is thought to be important for STAT3 activation. Recent molecular evidence further suggests that upregulation of STAT5 in early disease stages results in increased expression of oncogenic miR-155 microRNA that subsequently targets STAT4 expression on mRNA level. STAT4 signaling is known to be critical for T helper (Th) 1 phenotype differentiation and its loss results in a switch from Th1 to Th2 phenotype in malignant T cells. During this switch the expression of STAT6 is often upregulated in CTCL. In advanced stages, activation of STAT3 and STAT5 may become completely cytokine-independent and be driven only via constitutively active JAK1 and JAK3 kinases. Further research into the molecular pathogenesis of JAK/STAT signaling in this cancer may enable us to develop effective therapies for our patients.
Keywords:
Cutaneous T-Cell Lymphoma (CTCL)
Mycosis Fungoides
Sezary Syndrome
STAT3
STAT4
STAT5
STAT6
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laval university
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