June 20, 2018

Reducing Cholesterol Could Enhance T-Cell Cancer Immunotherapy

Tc9 cells have less intracellular cholesterol than other T cells

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Cleveland Clinic researchers have demonstrated for the first time that lowering blood cholesterol levels could enhance the success of a specific type of T-cell immunotherapy in fighting cancer.

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The team, led by Qing Yi, MD, PhD, studied T-cell transfer, which has shown great success in recent years. Dr. Yi, Chair of the Lerner Research Institute’s Department of Cancer Biology, previously showed that a specific subset of T cells, Tc9 cells, have stronger antitumor effects than other types of T cells. In the new study, they determined the mechanisms that give Tc9 cells their anticancer properties and how these mechanisms might be tweaked to enhance immunotherapy.

Using gene profiling, the researchers discovered that Tc9 cells had much lower levels of intracellular cholesterol than other T cells. They hypothesized that the reduced cholesterol levels might contribute to the cells’ antitumor effects. Indeed, manipulating cholesterol levels in the cells significantly affected IL-9 expression and Tc9 differentiation and antitumor response in vivo. Furthermore, the team showed in a tumor-bearing preclinical model that reducing cholesterol levels prior to immunotherapy led to greater concentrations of IL-9 and more antitumor activity.

Adoptive T-cell transfer

Adoptive T-cell transfer involves transplanting T cells engineered to recognize a certain type of cancer. Researchers have focused on many different methods to manipulate and enhance the T cells’ anti-cancer activity, such as transferring cells at different stages of differentiation or using certain drugs in tandem with immunotherapy. “Our studies suggest a relatively simple, cost-effective way to enhance T-cell transfer therapy,” Dr. Yi says. “We hope to test our findings in clinical trials soon.”

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Dr. Yi holds the Betsy B. de Windt Endowed Chair in Cancer Biology. Xingzhe Ma is a postdoctoral fellow and first author on the paper, published in the Journal of Experimental Medicine.

Figure republished with permission of Rockefeller University Press.

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