Engineered TYK2 dependence enables myeloid-selective IL-10 receptor agonism
IL-10's therapeutic use is limited because its myeloid-suppressive and T-cell-activating effects cannot be separated. Using the JAK1 inhibitor VVD-118313 in bone-marrow-derived macrophages, the authors show that JAK1-JAK1 transphosphorylation only partially reduces IL-10-induced STAT3 phosphorylation, with TYK2-mediated transphosphorylation compensating; in TYK2-deficient BMDMs, VVD-118313 fully abrogated STAT3 phosphorylation and IL-10 function. In human monocytes, the TYK2 inhibitor zasocitinib similarly partially reduced IL-10-driven STAT3 phosphorylation, revealing differential TYK2 dependence that may enable myeloid-selective IL-10 receptor agonism.
Why it matters: It maps a signalling route that could separate IL-10's anti-inflammatory benefit from its toxic T-cell activation.