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Oncology · The big question

Poor sleep helps colon cancer hide, but a new drug could help

Sleep Deprivation Inhibits CD8+ T Cell Function by Elevating Galectin-9 Expression in Colorectal Cancer Cells.

PubMed2 min readAI-assisted summary
Editorial illustration for Sleep Deprivation Inhibits CD8+ T Cell Function by Elevating Galectin-9 Expression in Colorectal Cancer Cells.
Editorial illustration

Summary

We all know a bad night of sleep leaves us feeling drained, but new research suggests it might also drain the ability of our immune system to fight cancer. Scientists have found that sleep deprivation actively helps colorectal tumors grow faster by shutting down the natural defenses of the body. When researchers studied mice with colon cancer, they discovered that a lack of sleep caused the tumors to produce high levels of a protein called Galectin-9.

What exactly does this protein do? Think of Galectin-9 as a biological stop sign for the immune system. Under sleep-deprived conditions, the surge in this protein effectively suppresses the activity of CD8+ T cells, which are the specialized immune cells responsible for hunting and destroying cancer cells. At the same time, the protein attracts regulatory T cells, whose job is to quiet the immune response down. The result is an environment where the tumor can grow unchecked.

To see if they could fix this, the researchers tested a specially engineered drug called a bispecific antibody, which is designed to grab onto both the Galectin-9 protein and the immune cells simultaneously. When they gave this treatment to the sleep-deprived mice, it successfully reversed the immune suppression, reactivated the cancer-fighting cells, and slowed down tumor growth.

Why it matters.

This research highlights a crucial link between our daily habits and the success of medical treatments. Immunotherapy has revolutionized cancer care by using the native immune system of a patient to fight tumors, but it does not work for everyone. These findings suggest that poor sleep might be one hidden reason why these therapies sometimes fail. By monitoring and improving sleep quality, doctors might be able to boost how well patients respond to standard immunotherapies.

Furthermore, creating drugs that target the Galectin-9 pathway offers a promising new strategy for researchers trying to overcome treatment-resistant cancers. It is important to note, however, that this science is still in its early stages. Because these experiments were conducted using mouse models, scientists will need to run comprehensive human clinical trials to ensure the antibody approach is both safe and effective for people. Even so, the study provides a compelling reason to view a good night of sleep as a vital component of modern cancer care.

From the source

The story in numbers.

Murine colon carcinoma cell line model
CT26
Cytotoxic T cell type inhibited by sleep deprivation
CD8+
Bispecific antibody targets used for treatment
CD3/Gal-9
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