An object of the present invention is to provide a method which is able to
prevent or improve the progress of myolytic diseases such as muscular
dystrophy. Such an object is able to be solved by a method where an
effective dose of an inhibitor for hematopoietic prostaglandin D synthase
(H-PGDS) or an antagonist to prostaglandin D receptor is administered to
a patient who needs it. The present invention also provides a method for
screening compounds which are able to prevent the progress of myolytic
diseases and to improve it using human H-PGDS overexpressed transgenic
mice.