A peer-reviewed investigation links packages released by blood-vessel cells to the establishment of cancer in the liver. Experiments traced a carried RNA molecule through changes in gene regulation, using cultured cells and mice. Patient datasets supplied additional associations. These findings concern a biological mechanism, without a clinical trial showing benefit from targeting it.
Cells lining blood vessels released tiny membrane packages that helped cancer cells establish themselves in the liver in laboratory experiments. The packages, called exosomes, carried RN7SL2, a ribonucleic acid or RNA molecule. The peer-reviewed investigation focused on uveal melanoma, which starts in the eye, and extended parts of the work to pancreatic cancer models. It combined cultured cells, mouse experiments and analyses of patient datasets.[1]
The researchers traced a chain of signalling changes to KLF4, a protein that regulates gene activity. It altered the accessibility of chromatin, the material in which genetic instructions are packaged, and regions that strongly control gene activity. Genes associated with cancer-cell survival and movement became more active. Mice had fewer liver nodules when the experiments reduced RN7SL2 inside the packages, supporting a role for the carried molecule in these models.[1]
An experimental inhibitor also reduced tumour growth and activity in the relevant genes in these models. This was not a clinical treatment comparison. In patient datasets, higher levels of some pathway components accompanied shorter survival; those associations cannot establish causation. The experiments identify interactions between cancer cells and surrounding vessel cells, with small animal groups and model-specific conditions limiting how far the findings extend to people.[1]
