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2015 ; 5
(ä): 11724
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Bridging Links between Long Noncoding RNA HOTAIR and HPV Oncoprotein E7 in
Cervical Cancer Pathogenesis
#MMPMID26152361
Sharma S
; Mandal P
; Sadhukhan T
; Roy Chowdhury R
; Ranjan Mondal N
; Chakravarty B
; Chatterjee T
; Roy S
; Sengupta S
Sci Rep
2015[Jul]; 5
(ä): 11724
PMID26152361
show ga
Human Papillomavirus (HPV) type 16 oncoprotein E7 plays a major role in cervical
carcinogenesis by interacting with and functionally inactivating various host
regulatory molecules. Long noncoding RNA (lncRNA) HOTAIR is one such regulator
that recruits chromatin remodelling complex PRC2, creating gene silencing
H3K27?me3 marks. Hence, we hypothesized that HOTAIR could be a potential target
of E7, in HPV16 related cervical cancers (CaCx). We identified significant linear
trend of progressive HOTAIR down-regulation through HPV negative controls, HPV16
positive non-malignants and CaCx samples. Majority of CaCx cases portrayed HOTAIR
down-regulation in comparison to HPV negative controls, with corresponding
up-regulation of HOTAIR target, HOXD10, and enrichment of cancer related
pathways. However, a small subset had significantly higher HOTAIR expression,
concomitant with high E7 expression and enrichment of metastatic pathways.
Expression of HOTAIR and PRC2-complex members (EZH2 and SUZ12), showed
significant positive correlation with E7 expression in CaCx cases and E7
transfected C33A cell line, suggestive of interplay between E7 and HOTAIR.
Functional inactivation of HOTAIR by direct interaction with E7 could also be
predicted by in silico analysis and confirmed by RNA-Immunoprecipitation. Our
study depicts one of the causal mechanisms of cervical carcinogenesis by HPV16
E7, through modulation of HOTAIR expression and function.