Investigators at the Ted Rogers Centre for Heart Research have discovered a surprising new role for tumor necrosis factor (TNF): namely, that it is a major regulator of small blood vessel function, the key determinant of blood pressure. The study is published online today in Nature Communications. TNF has long been tied to inflammation, giving rise to the use of anti-TNF medications for chronic inflammatory diseases such as rheumatoid arthritis, psoriasis and IBS. Now, after years of studying TNF's cell signaling functions in the vascular system, researchers found that TNF directly impacts how the smallest arteries constrict - and thus...