by InTrieste
The human heart is known for its relentless rhythm, contracting more than 100,000 times a day. Now, new research suggests that this constant motion may do more than circulate blood: it may also help suppress the growth of cancer.
A study published in Science and coordinated by the University of Trieste, in collaboration with the International Centre for Genetic Engineering and Biotechnology (ICGEB) and the Centro Cardiologico Monzino IRCCS, reports that the mechanical forces generated by the beating heart can significantly slow the growth of tumors in cardiac tissue.
The findings, based on experiments in mice, engineered heart tissues and analyses of human samples, point to a previously underappreciated factor in cancer biology: physical force. According to the researchers, the repeated contraction and deformation of the myocardium appear to create an environment that is less favorable to tumor expansion.
The study, titled Mechanical load inhibits tumor growth in mouse and human hearts, brings together institutions across Europe, including partners in Austria, Germany, Norway and the United Kingdom. Among them are the King’s College London, the University Medical Center Hamburg-Eppendorf, and the Simula Research Laboratory in Oslo, reflecting a multidisciplinary effort combining cardiology, oncology, bioengineering and computational modeling.
A rare organ for cancer
Clinically, primary tumors of the heart are extremely rare, and even metastatic tumors that reach the organ often appear smaller than in other tissues. Scientists have long suspected that the heart’s unique biological environment plays a role, but the mechanisms have remained unclear.
The new research focuses on one possible explanation: mechanical load. Unlike most organs, the heart is in near-constant motion, subjected to cyclical stretching, compression and pressure changes. The researchers hypothesized that this mechanical activity might directly influence how cancer cells behave.
To test this, the team used several experimental systems. In one set of experiments, they reduced mechanical load in cardiac tissue models. Under these conditions, tumor cells proliferated more rapidly. In contrast, when engineered heart tissues were stimulated to contract and mimic normal cardiac motion, tumor growth slowed significantly.
The effect was consistent across models: increased mechanical activity correlated with reduced tumor expansion, while reduced mechanical stimulation appeared to remove this constraint.
Mechanical forces as biological regulators
“We show that the heartbeat is not only a physiological function, but can act as a natural suppressor of tumor growth,” said Prof. Serena Zacchigna of the University of Trieste and the ICGEB, one of the study’s senior authors.
She added that the heart’s environment may be hostile to cancer cells not only because of immune or metabolic factors, but also due to the continuous physical forces acting on them. These forces, she noted, may limit the ability of tumor cells to expand and organize into larger masses.
Prof. Giulio Pompilio of the Centro Cardiologico Monzino IRCCS described the findings as part of a broader shift in how scientists understand tissue biology. Mechanical forces, long recognized as crucial in shaping heart function, may also influence disease processes in unexpected ways.
“One of the most interesting aspects of this work is that it highlights a dual role for mechanical forces in the heart,” he said. “They are known to limit regenerative capacity, yet here they appear to exert a protective effect against tumor growth. These may be two sides of the same biological mechanism.”
From cells to patients
A key strength of the study lies in its attempt to connect laboratory findings with clinical observations. Researchers compared experimental results with samples of human cardiac metastases and lesions in other organs from the same patients.
Molecular signatures identified in engineered tissues were also present in human samples, suggesting that the laboratory findings may reflect processes occurring in real disease settings.
The study also suggests that mechanical forces act not only at the surface of cells, but may influence internal regulatory pathways, including those involved in gene expression and cell proliferation. This raises the possibility that physical forces could interact with epigenetic mechanisms that control tumor behavior.
A new direction for cancer research
While the findings are still at an early stage, they open a broader conceptual question: whether mechanical stimulation could one day be harnessed in cancer therapy.
The idea of “mechanotherapy” — using physical forces to influence disease progression — is still speculative. However, the researchers argue that their results provide a biological foundation for further exploration.
Rather than viewing cancer solely through the lens of genetics, metabolism or immune response, the study suggests that the physical environment of tissues may also play a significant role in determining how tumors grow.
For now, the work remains primarily experimental. But it adds to a growing body of research suggesting that biology is shaped not only by molecules and cells, but also by the physical forces that surround them — including, in this case, the steady rhythm of the human heart.
