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Home NEWS Science News

Researchers identify ‘Achilles’ heel’ of key anti-cancer protein

Bioengineer by Bioengineer
February 13, 2017
in Science News
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Credit: Chen et al., 2017

Researchers at Cold Spring Harbor Laboratory in New York have discovered that a protein called Importin-11 protects the anti-cancer protein PTEN from destruction by transporting it into the cell nucleus. The study, "The nuclear transport receptor Importin-11 is a tumor suppressor that maintains PTEN protein," which will be published online February 13 in The Journal of Cell Biology, suggests that the loss of Importin-11 may destabilize PTEN, leading to the development of lung, prostate, and other cancers.

PTEN prevents tumor cells from growing uncontrollably, and mutations in the gene encoding this protein are commonly found in many different types of cancer. Some patients, however, show low levels of the PTEN protein even though their PTEN genes are normal. Lloyd Trotman, Muhan Chen, Dawid Nowak, and colleagues discovered that this may be due to defects in a protein called Importin-11 that transports PTEN into the nucleus, sheltering PTEN from cytoplasmic proteins that would otherwise target it for degradation.

Several cytoplasmic proteins–NEDD4-1, NDFIP1, and UBE2E1–combine to tag PTEN with the small molecule ubiquitin. PTEN tagged with multiple ubiquitin molecules can then be recognized and destroyed by the cell's protein degradation machinery. Trotman and colleagues found that Importin-11 protects PTEN from degradation by escorting not only PTEN but also UBE2E1 into the nucleus, thereby breaking up the cytoplasmic ubiquitination apparatus.

Mice lacking Importin-11 showed lower levels of PTEN protein and developed lung adenocarcinomas and prostate neoplasias. Mutations in the gene encoding Importin-11 have been identified in human cancers, and Trotman and colleagues found that tumors from lung cancer patients lacking Importin-11 tended to show low PTEN levels as well. The researchers estimate that loss of Importin-11 may account for the loss of PTEN in approximately one third of lung cancer patients lacking this key anti-cancer protein.

In prostate cancer, loss of Importin-11 predicted disease relapse and metastasis in patients who had had their prostates removed. "We think that the degradation of PTEN after loss or impairment of Importin-11 is a very effective driver of human prostate cancer," says Trotman. "Our results suggest that Importin-11 is the "Achilles' heel" of the ubiquitination system that maintains the correct levels of PTEN inside cells."

###

Chen et al., 2017. J. Cell Biol. http://jcb.rupress.org/cgi/doi/10.1083/jcb.201604025?PR

About The Journal of Cell Biology

The Journal of Cell Biology (JCB) features peer-reviewed research on all aspects of cellular structure and function. All editorial decisions are made by research-active scientists in conjunction with in-house scientific editors. JCB provides free online access to many article types from the date of publication and to all archival content. Established in 1955, JCB is published by The Rockefeller University Press. For more information, visit jcb.org.

Visit our Newsroom and sign up for a weekly preview of articles to be published. Embargoed media alerts are for journalists only.

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