» Articles » PMID: 28288632

Unexpected Selections of Plasmodium Falciparum Polymorphisms in Previously Treatment-naïve Areas After Monthly Presumptive Administration of Three Different Anti-malarial Drugs in Liberia 1976-78

Overview
Journal Malar J
Publisher Biomed Central
Specialty Tropical Medicine
Date 2017 Mar 15
PMID 28288632
Citations 5
Authors
Affiliations
Soon will be listed here.
Abstract

Background: To assess the effect on malaria prevalence, village specific monthly administrations of pyrimethamine, chlorproguanil, chloroquine or placebo were given to children in four previously treatment-naïve Liberian villages, 1976-78. Plasmodium falciparum in vivo resistance developed to pyrimethamine only. Selection of molecular markers of P. falciparum resistance after 2 years of treatment are reported.

Methods: Blood samples were collected from 191 study children in a survey in 1978. Polymorphisms in pfcrt, pfmdr1, pfdhfr, pfdhps, pfmrp1 and pfnhe1 genes were determined using PCR-based methods.

Results: Pfcrt 72-76 CVIET was found in one chloroquine village sample, all remaining samples had pfcrt CVMNK. Pfmdr1 N86 prevalence was 100%. A pfmdr1 T1069 synonymous polymorphism was found in 30% of chloroquine village samples and 3% of other samples (P = 0.008). Variations in pfnhe1 block I were found in all except the chloroquine treated village (P < 0.001). Resistance associated pfdhfr 108N prevalence was 2% in the pyrimethamine village compared to 45-65% elsewhere, including the placebo village (P = 0.001).

Conclusions: Chloroquine treatment possibly resulted in the development of pfcrt 72-76 CVIET. Selection of pfmdr1 T1069 and a pfnhe1 block 1 genotypes indicates that chloroquine treatment exerted a selective pressure on P. falciparum. Pyrimethamine resistance associated pfdhfr 108N was present prior to the introduction of any drug. Decreased pfdhfr 108N frequency concurrent with development of pyrimethamine resistance suggests a non-pfdhfr polymorphisms mediated resistance mechanism.

Citing Articles

Multidrug Resistance Proteins (MRPs).

Gil J, Fancony C Front Pharmacol. 2021; 12:759422.

PMID: 34790129 PMC: 8591188. DOI: 10.3389/fphar.2021.759422.


Chloroquine and hydroxychloroquine in the treatment of malaria and repurposing in treating COVID-19.

Lei Z, Wu Z, Dong S, Yang D, Zhang L, Ke Z Pharmacol Ther. 2020; 216:107672.

PMID: 32910933 PMC: 7476892. DOI: 10.1016/j.pharmthera.2020.107672.


Mosquitoes as a feasible sentinel group for anti-malarial resistance surveillance by Next Generation Sequencing of Plasmodium falciparum.

Smith-Aguasca R, Gupta H, Uberegui E, Maquina M, Saute F, Paaijmans K Malar J. 2019; 18(1):351.

PMID: 31623623 PMC: 6796398. DOI: 10.1186/s12936-019-2946-0.


Analysis of Plasmodium falciparum Na/H exchanger (pfnhe1) polymorphisms among imported African malaria parasites isolated in Wuhan, Central China.

Wu K, Yao Y, Chen F, Xu M, Lu G, Jiang T BMC Infect Dis. 2019; 19(1):354.

PMID: 31035938 PMC: 6489200. DOI: 10.1186/s12879-019-3921-7.


Prevalence of Plasmodium falciparum infection among pregnant women at first antenatal visit in post-Ebola Monrovia, Liberia.

Martinez-Perez G, Lansana D, Omeonga S, Gupta H, Breeze-Barry B, Gonzalez R Malar J. 2018; 17(1):357.

PMID: 30314489 PMC: 6186138. DOI: 10.1186/s12936-018-2506-z.

References
1.
Ashley E, Dhorda M, Fairhurst R, Amaratunga C, Lim P, Suon S . Spread of artemisinin resistance in Plasmodium falciparum malaria. N Engl J Med. 2014; 371(5):411-23. PMC: 4143591. DOI: 10.1056/NEJMoa1314981. View

2.
Dondorp A, Nosten F, Yi P, Das D, Phyo A, Tarning J . Artemisinin resistance in Plasmodium falciparum malaria. N Engl J Med. 2009; 361(5):455-67. PMC: 3495232. DOI: 10.1056/NEJMoa0808859. View

3.
Kone A, Mu J, Maiga H, Beavogui A, Yattara O, Sagara I . Quinine treatment selects the pfnhe-1 ms4760-1 polymorphism in Malian patients with Falciparum malaria. J Infect Dis. 2012; 207(3):520-7. PMC: 3537444. DOI: 10.1093/infdis/jis691. View

4.
Bjorkman A, Brohult J, Pehrson P, Willcox M, Rombo L, Hedman P . Monthly antimalarial chemotherapy to children in a holoendemic area of Liberia. Ann Trop Med Parasitol. 1986; 80(2):155-67. DOI: 10.1080/00034983.1986.11812000. View

5.
Noedl H, Se Y, Schaecher K, Smith B, Socheat D, Fukuda M . Evidence of artemisinin-resistant malaria in western Cambodia. N Engl J Med. 2008; 359(24):2619-20. DOI: 10.1056/NEJMc0805011. View