
13/10/2024
Breast Cancer May Spread by Recruiting Nearby Sensory Nerves
The body is packed with sensory nerves that pass sensations like touch, pain, and temperature to the nervous system. Such nerves are tangled through tissues in every organ and many tumors. And according to a new study, breast tumors have an unusual way of exploiting these nerves to help them spread to other parts of the body.
Previous research has found that direct contact between cancer cells and certain kinds of nerve cells can fuel tumor growth. Scientists have even observed some types of cancer cells crawling along nerves to spread (metastasize), explained the study’s lead investigator, Veena Padmanaban, Ph.D., a postdoctoral researcher at Rockefeller University.
Although the research team’s work implicated sensory nerves as a critical contributor to breast cancer metastasis, they found that breast cancer cells use them in an entirely different way. The team identified a complex process that starts with blood vessels within tumors releasing a molecule that draws nerves closer to them. The biological changes initiated by this close proximity eventually leads to the activation of metastasis-fueling genes in the cancer cells.
Fueling metastasis from a distance
In these experiments, although the sensory nerves appeared to be fueling tumor growth and spread, the two cell types weren’t physically touching, the researchers found. So how were the nerves exerting their effect?
By analyzing and testing substances secreted by both the nerves and the breast cancer cells, the researchers found that a tiny protein called substance P released by sensory nerves substantially boosted growth and spread of breast cancer cells growing in laboratory dishes. Large amounts of substance P were found in samples of human breast tumors that had spread to the lymph nodes.
In mice with breast tumors, blocking substance P greatly reduced tumor growth and metastasis.
Reference
Blood vessels within tumors release a molecule that draws sensory nerves closer, the study showed. This close proximity turns on metastasis-driving genes.