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An excellent new study by @BrodinPetter’s team on the differences between MIS-C and Kawasaki disease. This is incredibly timely and informative. Here are a couple of highlights. (1/)

cell.com/cell/fulltext/…
While there are some common features, MIS-C and Kawasaki disease differ in important areas. Non-overlapping symptoms and organ involvement, as well as the age group affected. Age in months in this study of MIS-C patients, 106 (71.1 - 165.4), and Kawasaki 24.5 (15.8 - 41.8). (2/)
Kawasaki disease patients have much higher levels of cytokines, IL-6, IL-17A and chemokine CXCL10, than either COVID-19 or MIS-C patients. (3/)
Notably, MIS-C patients did not have antibodies to other human coronaviruses, unlike COVID or Kawasaki patients (or healthy controls). Could this hCoV-naive state contribute to MIS-C development? (4/)
The most intriguing is the comparison of autoantibodies. MIS-C patients have higher levels of antibodies to MAP2K2 and to Casein kinase family members 👇🏽 On the other hand, Kawasaki patients had ⬆️ autoantibody against EDIL3. (5/)
This study begins to unravel the pathophysiology of MIS-C. Very curious to see if the autoantibodies are found in various tissues and induce leukocyte activation or complement fixation. (End)
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