Downregulation of m⁶ A writer complex member METTL14 in bladder urothelial carcinoma suppresses tumor aggressiveness.

ABSTRACT: N6-methyladenosine (m⁶ A) and its regulatory proteins have been associated with tumorigenesis in several cancer types. However, knowledge on the mechanistic network related to m⁶ A in bladder cancer (BlCa) is rather limited, requiring further investigation of its functional role. We aimed to uncover the biological role of m⁶ A and related proteins in BlCa and understand how this influences tumor aggressiveness. N6-adenosine-methyltransferase catalytic subunit (METTL3), N6-adenosine-methyltransferase noncatalytic subunit (METTL14), protein virilizer homolog (VIRMA), and RNA demethylase ALKBH5 (ALKBH5) had significantly lower expression levels in BlCa compared to that in normal urothelium. METTL14 knockdown led to disruption of the remaining methyltransferase complex and a decrease in m⁶ A abundance, as well as overall reduced tumor aggressiveness (decreased cell invasion and migration capacity and increased apoptosis). Furthermore, in vivo, METTL14 knockdown caused tumor size reduction. Collectively, we propose methyltransferase METTL14 as a key component for m⁶ A RNA deposit and that it is closely related to BlCa progression, playing an important role in tumor aggressiveness. These data contribute to a better understanding of the m⁶ A writer complex, which might constitute an appealing therapeutic target.

SUBMITTER: Guimaraes-Teixeira C 

PROVIDER: S-EPMC9067151 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature