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Loss of CITED1, an MITF regulator, drives a phenotype switch in vitro and can predict clinical outcome in primary melanoma tumours.

Howlin, Jillian LU ; Cirenajwis, Helena LU ; Lettiero, Barbara LU ; Staaf, Johan LU ; Lauss, Martin LU ; Saal, Lao LU ; Borg, Ke; Gruvberger, Sofia LU and Jönsson, Göran B LU (2015) In PeerJ 3.
Abstract
CITED1 is a non-DNA binding transcriptional co-regulator whose expression can distinguish the 'proliferative' from 'invasive' signature in the phenotype-switching model of melanoma. We have found that, in addition to other 'proliferative' signature genes, CITED1 expression is repressed by TGFβ while the 'invasive' signature genes are upregulated. In agreement, CITED1 positively correlates with MITF expression and can discriminate the MITF-high/pigmentation tumour molecular subtype in a large cohort (120) of melanoma cell lines. Interestingly, CITED1 overexpression significantly suppressed MITF promoter activation, mRNA and protein expression levels while MITF was transiently upregulated following siRNA mediated CITED1 silencing.... (More)
CITED1 is a non-DNA binding transcriptional co-regulator whose expression can distinguish the 'proliferative' from 'invasive' signature in the phenotype-switching model of melanoma. We have found that, in addition to other 'proliferative' signature genes, CITED1 expression is repressed by TGFβ while the 'invasive' signature genes are upregulated. In agreement, CITED1 positively correlates with MITF expression and can discriminate the MITF-high/pigmentation tumour molecular subtype in a large cohort (120) of melanoma cell lines. Interestingly, CITED1 overexpression significantly suppressed MITF promoter activation, mRNA and protein expression levels while MITF was transiently upregulated following siRNA mediated CITED1 silencing. Conversely, MITF siRNA silencing resulted in CITED1 downregulation indicating a reciprocal relationship. Whole genome expression analysis identified a phenotype shift induced by CITED1 silencing and driven mainly by expression of MITF and a cohort of MITF target genes that were significantly altered. Concomitantly, we found changes in the cell-cycle profile that manifest as transient G1 accumulation, increased expression of CDKN1A and a reduction in cell viability. Additionally, we could predict survival outcome by classifying primary melanoma tumours using our in vitro derived 'CITED1-silenced' gene expression signature. We hypothesize that CITED1 acts a regulator of MITF, functioning to maintain MITF levels in a range compatible with tumourigenesis. (Less)
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PeerJ
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3
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PeerJ
external identifiers
  • pmid:25755924
  • wos:000350754200001
  • scopus:84926483460
ISSN
2167-8359
DOI
10.7717/peerj.788
language
English
LU publication?
yes
id
0a2e23e6-427b-4c2f-b0e9-cc4d08ab158d (old id 5264841)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/25755924?dopt=Abstract
date added to LUP
2015-04-02 18:23:56
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2017-07-30 04:20:48
@article{0a2e23e6-427b-4c2f-b0e9-cc4d08ab158d,
  abstract     = {CITED1 is a non-DNA binding transcriptional co-regulator whose expression can distinguish the 'proliferative' from 'invasive' signature in the phenotype-switching model of melanoma. We have found that, in addition to other 'proliferative' signature genes, CITED1 expression is repressed by TGFβ while the 'invasive' signature genes are upregulated. In agreement, CITED1 positively correlates with MITF expression and can discriminate the MITF-high/pigmentation tumour molecular subtype in a large cohort (120) of melanoma cell lines. Interestingly, CITED1 overexpression significantly suppressed MITF promoter activation, mRNA and protein expression levels while MITF was transiently upregulated following siRNA mediated CITED1 silencing. Conversely, MITF siRNA silencing resulted in CITED1 downregulation indicating a reciprocal relationship. Whole genome expression analysis identified a phenotype shift induced by CITED1 silencing and driven mainly by expression of MITF and a cohort of MITF target genes that were significantly altered. Concomitantly, we found changes in the cell-cycle profile that manifest as transient G1 accumulation, increased expression of CDKN1A and a reduction in cell viability. Additionally, we could predict survival outcome by classifying primary melanoma tumours using our in vitro derived 'CITED1-silenced' gene expression signature. We hypothesize that CITED1 acts a regulator of MITF, functioning to maintain MITF levels in a range compatible with tumourigenesis.},
  articleno    = {e788},
  author       = {Howlin, Jillian and Cirenajwis, Helena and Lettiero, Barbara and Staaf, Johan and Lauss, Martin and Saal, Lao and Borg, Ke and Gruvberger, Sofia and Jönsson, Göran B},
  issn         = {2167-8359},
  language     = {eng},
  publisher    = {PeerJ},
  series       = {PeerJ},
  title        = {Loss of CITED1, an MITF regulator, drives a phenotype switch in vitro and can predict clinical outcome in primary melanoma tumours.},
  url          = {http://dx.doi.org/10.7717/peerj.788},
  volume       = {3},
  year         = {2015},
}