期刊
ISCIENCE
卷 20, 期 -, 页码 14-+出版社
CELL PRESS
DOI: 10.1016/j.isci.2019.09.009
关键词
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资金
- Australian NHMRC [1064591]
- Royal Australasian College of Physicians
- Reid Family Trust
- Lung Foundation Australia
- Cancer Council Victoria
- National Health and Medical Research Council of Australia [1064591] Funding Source: NHMRC
RNautophagy is a newly described type of selective autophagy whereby cellular RNAs are transported into lysosomes for degradation. This process involves the transmembrane protein SIDT2, which transports double-stranded RNA (dsRNA) across the endolysosomal membrane. We previously demonstrated that SIDT2 is a transcriptional target of p53, but its role in tumorigenesis, if any, is unclear. Unexpectedly, we show here that Sidt2(-/-) mice with concurrent oncogenic Kras(G12D) activation develop significantly fewer tumors than littermate controls in a mousemodel of lung adenocarcinoma. Consistent with this observation, loss of SIDT2 also leads to enhanced survival and delayed tumor development in an Apc(min/+) mouse model of intestinal cancer. Within the intestine, Apc(min/+);Sidt2(-/-) mice display accumulation of dsRNA in association with increased phosphorylation of eIF2 alpha and JNK as well as elevated rates of apoptosis. Taken together, our data demonstrate a role for SIDT2, and by extension RNautophagy, in promoting tumor development.
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