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NOT Open Access | Pharmacokinetics and Ex vivo Antimalarial Activity of Artesunate-Amodiaquine plus Methylene Blue in Healthy Volunteers

January 27, 2020 - 13:47 -- NOT Open Access
Anh CX, Chavchich M, Birrell GW, Van Breda K, Travers T, Rowcliffe K, Lord AR, Shanks GD, Edstein MD
Antimicrob Agents Chemother. 2020 Jan 6. pii: AAC.01441-19

High artesunate combination therapy (ACT) treatment failures of Plasmodium falciparum malaria in Southeast Asia has led to triple drug strategies to extend the useful life of ACTs. In this study, we determined whether methylene blue (MB) alters the pharmacokinetics of artesunate-amodiaquine (ASAQ) and enhances the ex vivo antimalarial activity of ASAQ. In an open labelled, randomized cross-over design, a single oral dose of either ASAQ (200 mg AS/540 mg AQ) alone or with MB (325 mg MB) was administered to 15 healthy Vietnamese volunteers. Serial blood samples were collected up to 28 days after dosing.

NOT Open Access | Activation of TCR Vδ1+ and Vδ1-Vδ2- γδ T Cells upon Controlled Infection with Plasmodium falciparum in Tanzanian Volunteers

December 10, 2019 - 11:13 -- NOT Open Access
Rutishauser T, Lepore M, De Libero G, et al.
The Journal of Immunology Vol. 203, Issue 11, 1 Dec 2019, ji1900669

Our understanding of the human immune response to malaria remains incomplete. Clinical trials using whole-sporozoite-based vaccination approaches such as the Sanaria PfSPZ Vaccine, followed by controlled human malaria infection (CHMI) to assess vaccine efficacy offer a unique opportunity to study the immune response during Plasmodium falciparum infection. Diverse populations of T cells that are not restricted to classical HLA (unconventional T cells) participate in the host response during Plasmodium infection. Although several populations of unconventional T cells exist, the majority of studies focused on TCR Vγ9Vδ2 cells, the most abundant TCR γδ cell population in peripheral blood.

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