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Direct Effects of Immunomodulatory Agents on Podocytes in Immune-Mediated Glomerular Diseases.

Amelioration of podocyte injury, which can lead to podocyte detachment, is the target of therapeutic intervention in glomerular diseases. Since podocytes are terminally differentiated cells with little or no proliferative ability, their loss results in permanent glomerular dysfunction. In immune-mediated glomerular diseases, a variety of immunomodulatory agents are used to maintain podocytes by systemic immunosuppression, which indirectly ameliorates podocyte injury by interrupting the input of immunological stress. However, in contrast to the indirect therapeutic strategy mediated by immunosuppression, recent data now suggest that immunomodulatory agents directly act on podocytes in an agent-dependent manner. Indeed, the therapeutic efficacy of immunomodulatory agents is, at least in part, derived by the direct action on podocytes. In this review, we discuss the molecular targets and mechanisms by which immunomodulatory agents alleviate podocyte injury and examine their clinical significance.