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Protein RAL associated with aggressive characteristics in prostate, bladder and skin cancers

by Urology Today
September 8, 2020
in Urology / Nephrology News
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We have known for years that when the proteins RalA and RalB are present, cells in dishes copy toward aggressive forms of cancer. However, until this week, no study had explored the effects of RAL proteins in human cancers – an essential step on the path to developing drugs to target these proteins. From metastasis in bladder cancer, to seminal vessel involvement in prostate cancer, to shortened survival in squamous cell carcinoma, a study published this week in the journal Cancer Research shows that proteins RalA and RalB are associated with aggressive cancer characteristics in human tumors.

“But here’s the interesting part,” says Dan Theodorescu, director of the University of Colorado Cancer Center and the paper’s senior author – “it wasn’t the presence of these proteins per se that predicted aggressive cancer characteristics, it was the signature of other genes changed by RAL activity in the cells that predicted poor outcomes.”

RalA and RalB activity leads to a cascade of genetic (and gene expression) changes. Theodorescu and colleagues discovered the signature of these changes, and this pattern of turning up and turning down genes is what predicts aggressive cancers.

“It might not be presence of these RAL proteins themselves that drives cancer as much as their ability to drive genetic changes that in turn drive cancer,” Theodorescu says.

In the three types of human tumors explored – bladder, prostate, and the skin cancer known as squamous cell carcinoma – panels of genes affected by RalA and RalB in turn predicted stage and survival.

“The RAL family of GTPases are cousins of the now well-known RAS family of oncogenes,” Theodorescu explains. “These RAS family GTPases, are found in leukemias, lung cancer, colon cancer and others, and have been a focus of efforts to develop targeted cancer therapies. We imagine the related RAL family may provide a similar target.”

Remove RalA and RalB from cancer cells and perhaps doctors can stop the genetic changes that cause aggressive cancer.

###

Support for the study was provided by National Institutes of Health and National Cancer Institute grant CA075115.

###

Erika Matich
.(JavaScript must be enabled to view this email address)
303-524-2780
University of Colorado Denver

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