Provided is a means for inhibiting a function of CD69, whereby allowing suppression of an inflammatory response. That is, provided are: a composition for treating an inflammatory disease which includes an antibody that specifically recognizes a myosin regulatory light chain polypeptide (hereinafter abbreviated asMyl), preferably Myl9, Myl12a, and Myl12b,and inhibits a result of an effect of coexistence of Myl with CD69 a method of treating an inflammatory disease, including administering, to a subject diagnosed as having an inflammatory disease, a therapeutically effective amount of the antibody and a method of identifying a compound that inhibits a result of an effect of coexistence of Myl with CD69, and a method of identifying a candidate compound for treating an inflammatory disease, including selecting a compound that inhibits the result.
