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We compared the activities of two different biological-response modifiers with that of clarithromycin against Mycobacterium avium complex infection in C57BL/6 mice. Mice were pretreated daily with clarithromycin (50 mg/kg of body weight subcutaneously [s.c.]), RU-40555 (100 mg/kg s.c.), or granulocyte colony-stimulating factor (G-CSF) at low dose (15 micrograms/kg intraperitoneally [i.p.]) or high dose (300 micrograms/kg i.p.) 3 days before intravenous challenge with 2.5 x 10(7) CFU of the MO-1 strain of M. avium complex. Mice were treated daily until sacrifice at day 1, 8, 15, or 21 after challenge, and the numbers of CFU were measured per gram of tissue in lung and spleen. Compared at day 21 with control treatment, clarithromycin significantly decreased the level of infection in spleen (P &lt; 0.0001) and lungs (P &lt; 0.0001). Compared with control treatment, G-CSF at low dose had no activity, but G-CSF in combination with clarithromycin was more effective than clarithromycin alone in spleen (P &lt; 0.05) and lungs (P &lt; 0.015). The high dose of G-CSF was as effective as the low dose. RU-40555 alone had no beneficial activity. The RU-40555-clarithromycin combination was more effective than control treatment in spleen (P = 0.0001) and lungs (P &lt; 0.0005) and more effective than clarithromycin alone in spleen (P &lt; 0.009) but not in lungs. Thus, our experiments suggest that clarithromycin alone or in combination with G-CSF should be further evaluated for the prophylaxis of M. avium complex infection.

antimicrobial agents and chemotherapy

Efficacy of granulocyte colony-stimulating factor and RU-40555 in combination with clarithromycin against Mycobacterium avium complex infection in C57BL/6 mice