Myeloid dendritic cells, which contribute to an immunologic synapse responsible for activation of the adaptive immune system, are abundant within muscle in inclusion body myositis and polymyositis.

• 作用于免疫突触反应、活化适应性免疫应答的髓样树突状细胞在包涵体肌炎和多发性肌炎中大量存在。