[Therapeutic effects of benzoxazinorifamycin KRM-1648 administered alone or in combination with glycyrrhizin against Mycobacterium avium complex infection in mice]

Abstract

We previously examined the effects of a Chinese medicine "Mao-Bushi-Saishin-To" (MBST) which has anti-inflammatory activity on the therapeutic efficacies of a benzoxazinorifamycin, KRM-1648 (KRM), against, Mycobacterium avium complex (MAC) infection induced in mice. MBST potentiated the therapeutic activity of KRM against MAC infection. In the present study, we examined the effects of another anti-inflammatory drug Glycyrrhizin, which is effective for chronic hepatitis, on the therapeutic efficacy of KRM against MAC infection induced in mice. First, KRM significantly inhibited the bacterial growth in the lungs and spleen of MAC-infected mice. Glycyrrhizin exhibited no therapeutic activity against MAC infection and did not affect the expression of the therapeutic efficacy of KRM. Secondly, treatment of murine peritoneal macrophages (M phi s) with Glycyrrhizin caused no significant changes in the M phi anti-MAC activity.