Author: Lawrence, Nina ; Wilhelm, Anke ; van der Westhuizen, Jan ; Swart, Kenneth ; Gibhard, Liezl ; Pravin, Kendrekar ; Abay, Efrem ; Khoury, Rosal ; Smith, Peter ; Wiesner, Lubbe

ABSTRACT Malaria remains a great burden on humanity. Although significant advances have been made in the prevention and treatment of malaria, malaria control is now hindered by an increasing tolerance of the parasite to one or more drugs within artemisinin combination therapies; therefore, an urgent need exists for development of novel and improved therapies. The University of the Free State Chemistry Department previously synthesized an antimalarial compound, NP046. In vitro studies illustrated an enhanced efficacy against Plasmodium falciparum . However, NP046 showed low bioavailability. Efforts to enhance the bioavailability of NP046 have resulted in the synthesis of a number of aminoalkylated diarylpropanes, including NP085 and NP102. Pharmacokinetic studies were conducted in C57BL/6 mice, with 15 mg/kg NP085 or NP102 administered orally and the 5 mg/kg NP085 or NP102 administered intravenously. Blood samples were collected by means of tail bleeding at predetermined time intervals. Drug concentrations were determined using a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method, and subsequently pharmacokinetic modeling was done for both compounds. NP085 and NP102 were incubated in vitro with human and mouse liver microsomes. Both compounds were also subjected to a parallel artificial membrane permeation assay. In vitro studies of NP085 and NP102 illustrated that both of the compounds are rapidly absorbed and undergo rapid hepatic metabolism. The maximum concentration of drug ( Cmax ) obtained following oral administration of NP085 and NP102 was 0.2 ± 0.4 and 0.7 ± 0.3 μM, respectively; the elimination half-life of both compounds was 6.1 h. NP085 and NP102 showed bioavailability levels of 8% and 22%, respectively.

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Indication	Highest Phase	Country/Location	Organization	Date
Tuberculosis, Multidrug-Resistant	Phase 1	CN	Guangxi Xinwei Pharmaceutical Technology Co., Ltd.	30 Jan 2022
Pulmonary Tuberculosis	Phase 1	CN	Guangxi Xinwei Pharmaceutical Technology Co., Ltd.	-

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