A new study reports that the constant beating of the heart may actively inhibit tumor growth in heart tissue. This is because cellular pathways in these tissues change the gene regulation of cancer cells, preventing them from multiplying. The findings shed light on the role of mechanical forces in protecting the heart from cancer and may pave the way for new cancer treatments based on mechanical stimulation. Heart cancer is extremely rare in mammals. Additionally, the adult heart has a limited ability to self-renew, with cardiomyocyte regeneration rates of approximately 1% per year. One proposed explanation for these characteristics lies in the strong mechanical demands placed on the heart tissue, which must continue to pump blood against great resistance. Such sustained tension is thought to suppress the ability of heart cells to proliferate. According to Giulio Ciucci and colleagues, these pressures may also inhibit the growth of cancer cells within the heart. However, the mechanisms underlying this resistance remain unclear.
Using Ciucci, a genetically engineered mouse model Others. found that the heart is remarkably resistant to cancer-causing mutations, even when strong oncogenic changes are introduced. To understand why, the authors developed a transplant model that can reduce the mechanical load on the heart. By transplanting a donor heart into the neck of a compatible mouse, they created a “mechanically unloaded” organ, an organ that remained perfused with blood but could not withstand physiological strain. After injecting human cancer cells directly into the myocardium, they compared tumor behavior in unloaded transplanted hearts and in the animals’ native, mechanically active hearts. Through their experiments, Ciucci Others. They found that while mechanical loading consistently suppressed the growth of various types of cancer, loading the heart promoted the growth of tumor cells within heart tissue.
The findings show that mechanical forces within tissues reshape the genomic regulatory landscape of cancer cells, influencing whether they can proliferate. Central to this process is nesprin-2, a protein that transmits mechanical signals from the cell surface to the nucleus. Nesprin-2, a component of the LINC complex, senses the cardiac mechanical microenvironment and functionally alters chromatin structure and histone methylation, reducing gene activity associated with tumor cell proliferation. When nesprin-2 is suppressed in cancer cells, those cells regain the ability to proliferate in the mechanically active environment of the heart and form tumors. In a related Perspective, Wyatt Paltzer and James Martin detail this study and its results.
sauce:
American Association for the Advancement of Science (AAAS)
Reference magazines:
Ciucci, G. Others. (2026). Mechanical loading inhibits cancer growth in mouse and human hearts. Science. DOI: 10.1126/science.ads9412. https://www.science.org/doi/10.1126/science.ads9412
