Metabolic vulnerabilities in malignant cells may lead to new breast cancer therapies

Children's Health

Metabolic differences could explain why some metastatic breast cancer cells rapidly generate tumors after migrating from primary tumors to the brain, while others linger for months or years before forming these secondary tumors, UT Southwestern scientists report in a new study. The findings, published in Cell Metabolism, highlight metabolic vulnerabilities in malignant cells that could eventually lead to new cancer therapies.

Brain metastasis is a major problem for breast cancer patients, and most of the treatments that we have are not that effective. We have identified unique features of metastatic breast cancer cells that could serve as new targets.”

Srinivas Malladi, Ph.D., Assistant Professor of Pathology and Member of the Harold C. Simmons Comprehensive Cancer Center

Srinivas Malladi co-led the study with Pravat Kumar Parida, Ph.D., a postdoctoral fellow in the Malladi lab.

The brain is a common site for breast cancer metastasis, particularly for patients with a subtype of this disease known as HER2+. About half of patients with HER2+ breast cancers develop secondary tumors at some point after their primary tumor is diagnosed, Dr. Malladi explained, a phenomenon known as metachronous brain metastasis (M-BM). Synchronous brain metastasis (S-BM), when secondary brain tumors are diagnosed at the same time as the primary breast tumor, are rarer – but patients with S-BM have a far worse prognosis, with a median overall survival of just six months after diagnosis. HER2+ breast cancer patients with latent brain metastatic cells (Lat) are asymptomatic and likely to develop M-BM over variable lengths of time.

Using an animal model developed in the Malladi lab, Drs. Malladi, Parida and their colleagues found significant differences in the metabolism of these different types of brain metastatic cells. For example, while S-BM cells used glucose as a primary fuel source, M-BM and Lat cells used a related sugar called glutamine. Also, Lat cells secreted less lactate, a form of lactic acid, than M-BM and S-BM cells. Lactate helps M-BM and S-BM cells to evade innate immune surveillance and hence can promote tumor survival.

Additionally, the researchers discovered higher amounts of a protein known as xCT, which mediates oxidative stress, in the M-BM and Lat cells compared to S-BM. Stemming the activity of this protein using genetic techniques and chemical inhibitors significantly reduced the metastatic activity of M-BM and Lat cells and made them more vulnerable to drugs that target HER2+ cells.

Dr. Malladi noted that the differences identified in the study suggest potential targets to attack brain metastasis in breast cancers and potentially other types of malignancies. Because an xCT inhibitor is already being tested in clinical trials for multiple myeloma, he added, its use could represent a particularly promising strategy for attacking metabolic vulnerabilities of brain metastases.

The Simmons Cancer Center, the only National Cancer Institute-designated comprehensive cancer center in North Texas, is ranked among the top 25 cancer centers in the nation by U.S. News & World Report. UT Southwestern, home of the Peter O’Donnell Jr. Brain Institute, is also ranked among the top 20 hospitals for neurology and neurological surgery by U.S. News.

Journal reference:

Parida, P.K., et al. (2022) Metabolic diversity within breast cancer brain-tropic cells determines metastatic fitness. Cell Metabolism.

Articles You May Like

Mommy’s Favorite Things – 7 ideas to Relax and Unwind
Is there a better way to screen for cervical cancer?
Can probiotics prevent ear infections and tonsilitis?
5 Ways to a Healthy Coparenting Relationship after Divorce
The CRA may owe you money from years ago
Newborn sleep: 7 common mistakes new parents make
How the Fisher-Price Play Lab turns child’s play into educational toys
This TikTok mom found the simplest way to keep toddlers entertained
What Are Breast Pads? Types and Tips To Choose Them
2022 Tri My Best Adaptive Triathlon
Did You Know Some Halloween Candy Is Better for Your Kid’s Teeth?
The Medical 3D Printing Center at Washington University Medical Campus
Can Babies Play Independently?

Leave a Reply

Your email address will not be published.