Macrophages can detect physical changes in their own volume as a warning signal, according to a study reported by Genetic Engineering News. Researchers found that cell swelling or osmotic stress rewires gene expression, enhancing type I interferon signaling and intensifying the inflammatory response.
The findings center on volume-regulated anion channels (VRAC). When these channels are deficient, the mechanism by which osmotic stress alters antiviral responses becomes apparent, leading to hyperinflammation. This suggests a previously unknown link between cellular biophysics and immune activation.