BTK-Inhibition Enhances TLR-7-Mediated Interferon-Alpha Production in pDCs by Blocking the Inhibitory BDCA-2 Pathway.

In pDCs, BTK-inhibition (BTKi) blocks the IFN-α production via TLR-9, but not via TLR-7. Upon TLR-7 stimulation, BTKi enhances the production of IFN-α by blocking the inhibitory BDCA-2 pathway. This might explain partially the failure of BTKi in SLE and is of interest for BTKi trials in multiple sclerosis.

Persistent complement dysregulation with signs of thromboinflammation in active Long Covid.

Long Covid is a debilitating condition of unknown etiology. We performed multimodal proteomics analyses of blood serum from COVID-19 patients followed up to 12 months after confirmed severe acute respiratory syndrome coronavirus 2 infection. Analysis of >6500 proteins in 268 longitudinal samples revealed dysregulated activation of the complement system, an innate immune protection and homeostasis mechanism, in individuals experiencing Long Covid.