Expression of MyoD and myogenin in muscles of mice experimentally infectedwith Trichinella spiralis or Trichinella pseudospiralis

We developed a detection system for myogenic regulatory factors such as Myo D and myogenin. Adapting the method we performed a longitudinal analysis of such regulatory factors after infection with T. spiralis and T, pseudospir alis. MyoD and myogenin were expressed from the early phase of cystogenesis in T spiralis infection. The expression returned to the normal level after 18 days from the infection when the cyst was complete. In T. pseudospirali s infection, they were also expressed from the early phase of cystogenesis, but continuously expressed at least up to 43 days post infection.