The long noncoding RNA HIF1A-AS2 facilitates cisplatin resistance in bladder cancer.

Abstract:

:Chemotherapy drug resistance frequently happens in more than 50% of bladder cancer patients and is the major obstacle for the bladder cancer therapy. Recent studies have shown that long noncoding RNA (lncRNA) is involved in the development of chemoresistance. In this study, we reported hypoxia inducible factor 1α-antisense RNA 2 (HIF1A-AS2), as a subtype-specific hypoxia inducible lncRNA, is upregulated in bladder cancer cells and tissue after cisplatin (Cis) treatment. The induction of HIF1A-AS2 in bladder cancer cells rendered resistance to Cis-induced apoptosis. Silencing HIF1A-AS2 in Cis-resistant bladder cancer cells was re-sensitized to Cis-induced apoptosis. Mechanically, we found that HIF1A-AS2 suppressed the transcription activity of p53 family proteins by promoting the expression of high-mobility group A1 (HMGA1). The induction of HMGA1 physically interacts with p53, p63, and p73, and therefore constrains their transcriptional activity on Bax. Knockdown of HIF1A-AS2 or HMGA1 rescued the expression of Bax, which therefore enhanced the killing effect of Cis. Furthermore, we also found that the expression of HIF1A-AS2 was higher in the human bladder tumor tissues after Cis treatment, and was positive correlated to the expression of HIF1α and HMGA1. This study suggests that upregulated HIF1A-AS2 hampers the p53 family proteins dependent apoptotic pathway to promote Cis resistance in bladder cancer. Our data suggested that HIF1A-AS2 plays oncogenic roles and can be used as a therapeutic target for treating human bladder cancer.

journal_name

J Cell Biochem

authors

Chen X,Liu M,Meng F,Sun B,Jin X,Jia C

doi

10.1002/jcb.27327

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

243-252

issue

1

eissn

0730-2312

issn

1097-4644

journal_volume

120

pub_type

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