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Component of keto diet plus immunotherapy may reduce prostate cancer

April 28, 2024
in Health
Component of keto diet plus immunotherapy may reduce prostate cancer
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cancer therapy

Credit: Unsplash/CC0 Public Domain

Adding a pre-ketone supplement—a component of a high-fat, low-carb ketogenic diet—to a type of cancer therapy in a laboratory setting was highly effective for treating prostate cancer, researchers from the University of Notre Dame found.

Recently published online in the journal Cancer Research, the study from Xin Lu, the John M. and Mary Jo Boler Collegiate Associate Professor in the Department of Biological Sciences, and collaborators tackled a problem oncologists have battled: Prostate cancer is resistant to a type of immunotherapy called immune checkpoint blockade (ICB) therapy. ICB therapy blocks certain proteins from binding with other proteins and paves the way for our body’s fighter cells, T cells, to kill the cancer.

“Prostate cancer is the most common cancer for American men, and immunotherapy has been really influential in some other cancers, like melanoma or lung cancer, but it hasn’t been working almost at all for prostate cancer,” said Lu, who is affiliated with the Boler-Parseghian Center for Rare and Neglected Diseases. Adding a dietary supplement might overcome this resistance, the lead author in the study, Sean Murphy, suggested.

Murphy, a ’24 alumnus who was a doctoral student in Lu’s lab, had been following a keto diet himself. Knowing that cancer cells feed off of sugar, he decided that depriving mouse models of carbohydrates—a key component of the keto diet—might prevent cancer growth.

He divided the models into different groups: immunotherapy alone, ketogenic diet alone, a pre-ketone supplement alone, the ketogenic diet with the immunotherapy, the supplement with the immunotherapy, and the control. While the immunotherapy alone had almost no effect on the tumors (just like what happens to most patients with prostate cancer), both the ketogenic diet with the immunotherapy and the pre-ketone supplement with the immunotherapy reduced the cancer and extended the lives of the mouse models.

The supplement with the immunotherapy worked best.

“It turned out this combination worked really well,” Lu said. “It made the tumor become very sensitive to the immunotherapy, with 23 percent of the mice cured—they were tumor-free; in the rest, the tumors were shrinking really dramatically.”

The evidence points to the possibility that a supplement providing ketones, which are what is produced in the body when people eat a keto diet, might prevent the prostate cancer cells from being resistant to immunotherapy. This may lead to future clinical studies that examine how ketogenic diets or keto supplements could enhance cancer therapy.

While keto diets allow for minimal carbohydrates, the success of this study is not about the lack of carbohydrates, Murphy and Lu stressed. It is about the presence of the ketone body, a substance produced by the liver and used as an energy source when glucose is not available. The ketones disrupt the cycle of the cancer cells, allowing the T cells to do their job to destroy them.

The discovery was also exciting on a molecular level, Lu said. Any type of dietary study can suffer from the potential issue of causation: Are the results from the diet or other changes made because of the diet? But Lu and his collaborators confirmed their results using single-cell RNA sequencing, which examines the gene expression of single cells within the tumor.

“We found that this combination of the supplement and the immunotherapy reprogrammed the whole immune profile of the tumors and recruited many T cells into the tumors to kill prostate cancer cells,” Lu said.

The successful therapy also reduced the number of a type of immune cell called neutrophils. Once in the tumor microenvironment, neutrophils’ natural properties become greatly distorted, and they become largely responsible for inhibiting T cell activities and allowing more tumor progression. Dysregulation of neutrophils is also associated with many other diseases.

“With the main ketone body depleting neutrophils, it opens the door for investigating the effects of the keto diet and the ketone supplement on diseases ranging from inflammatory bowel disease to arthritis,” Murphy said.

Lu agreed.

“What’s exciting is that we’re getting closer to the mechanism, backed up by genetic models and what we’re seeing in the tumors themselves, of why this works,” he said.

Co-authors include Sharif Rahmy, Dailin Gan, Guoqiang Liu, Yini Zhu, Maxim Manyak, Loan Duong, Jianping He, James H. Schofield, Zachary T. Schafer, Jun Li and Xuemin Lu, all from the University of Notre Dame.

More information:
Sean Murphy et al, Ketogenic diet alters the epigenetic and immune landscape of prostate cancer to overcome resistance to immune checkpoint blockade therapy, Cancer Research (2024). DOI: 10.1158/0008-5472.CAN-23-2742

Citation:
Component of keto diet plus immunotherapy may reduce prostate cancer (2024, April 27)
retrieved 28 April 2024
from https://medicalxpress.com/news/2024-04-component-keto-diet-immunotherapy-prostate.html

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part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Medical Xpress – https://medicalxpress.com/news/2024-04-component-keto-diet-immunotherapy-prostate.html

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