Author:
Lee Min-Sik,Jeong Man-Hyung,Lee Hyun-Woo,Han Hyun-Ji,Ko Aram,Hewitt Stephen M.,Kim Jae-Hoon,Chun Kyung-Hee,Chung Joon-Yong,Lee Cheolju,Cho Hanbyoul,Song Jaewhan
Abstract
AbstractThe activity of the phosphatase and tensin homologue (PTEN) is known to be suppressed via post-translational modification. However, the mechanism and physiological significance by which post-translational modifications lead to PTEN suppression remain unclear. Here we demonstrate that PTEN destabilization is induced by EGFR- or oncogenic PI3K mutation-mediated AKT activation in cervical cancer. EGFR/PI3K/AKT-mediated ubiquitination and degradation of PTEN are dependent on the MKRN1 E3 ligase. These processes require the stabilization of MKRN1 via AKT-mediated phosphorylation. In cervical cancer patients with high levels of pAKT and MKRN1 expression, PTEN protein levels are low and correlate with a low 5-year survival rate. Taken together, our results demonstrate that PI3K/AKT signals enforce positive-feedback regulation by suppressing PTEN function.
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry
Reference41 articles.
1. Li, J. et al. PTEN, a putative protein tyrosine phosphatase gene mutated in human brain, breast, and prostate cancer. Science 275, 1943–1947 (1997).
2. Steck, P. A. et al. Identification of a candidate tumour suppressor gene, MMAC1, at chromosome 10q23.3 that is mutated in multiple advanced cancers. Nat. Genet. 15, 356–362 (1997).
3. Guldberg, P. et al. Disruption of the MMAC1/PTEN gene by deletion or mutation is a frequent event in malignant melanoma. Cancer Res. 57, 3660–3663 (1997).
4. Di Cristofano, A., Pesce, B., Cordon-Cardo, C. & Pandolfi, P. P. Pten is essential for embryonic development and tumour suppression. Nat. Genet. 19, 348–355 (1998).
5. Hopkins, B. D., Hodakoski, C., Barrows, D., Mense, S. M. & Parsons, R. E. PTEN function: the long and the short of it. Trends Biochem. Sci. 39, 183–190 (2014).
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