Pharmacokinetics and pharmacodynamics of oleylphosphocholine in a hamster model of visceral leishmaniasis

• Objectives: This study evaluated the pharmacokinetic properties of oleylphosphocholine (OlPC) in hamsters following a single oral dose. Its prophylactic activity was tested to establish exposure-activity relationships, while a 5+5 day oral regimen at 20 mg/kg with long post-treatment follow-up was performed to assess its curative potential. Methods: Single oral doses of 20, 50 and 100 mg/kg were administered for pharmacokinetic analysis while a 100 mg/kg single oral dose was given on day 7, 4 or 1, or 4 h prior to infection in the prophylactic efficacy study. The animals were infected on day 0 with Leishmania infantum and the resulting parasite burdens were measured in target organs on day 21. In the curative model, treatment started on day 21 post-infection at 20 mg/kg for 5+5 days and amastigote burdens were determined in target organs either on day 42 [10 days after the end of treatment (dpt)] or day 72 (40 dpt). Results: OlPC showed elimination t(1/2) of similar to 50 h and dose-proportional exposure. The prophylactic action of OlPC was in agreement with model-simulated drug exposures, showing dose-dependent residual activity. Interestingly, the 100 mg/kg single dose administered 4 days before infection (day -4) still reduced the overall parasite burden by similar to 50%. In the curative model, >99% clearance of infection was observed at 10 dpt in all OlPC-treated animals and remained so at 40 dpt. Conclusions: This study reveals that total plasma exposure (AUC(t-infinity)) correlates well with the prophylactic and curative efficacy of OlPC in the L. infantum hamster model.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Infektionsmedicin (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Infectious Medicine (hsv//eng)

MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Farmaceutiska vetenskaper (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Pharmaceutical Sciences (hsv//eng)

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