A 4-cyano-3-methylisoquinoline inhibitor of Plasmodium falciparum growth targets the sodium efflux pump PfATP4.

Autor:	Gilson PR; Burnet Institute, Melbourne, Victoria, 3004, Australia. paul.gilson@burnet.edu.au.; Monash University, Melbourne, Victoria, 3800, Australia. paul.gilson@burnet.edu.au., Kumarasingha R; Burnet Institute, Melbourne, Victoria, 3004, Australia., Thompson J; The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, 3052, Australia., Zhang X; Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia., Penington JS; The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, 3052, Australia., Kalhor R; La Trobe University, Melbourne, Victoria, 3086, Australia., Bullen HE; Burnet Institute, Melbourne, Victoria, 3004, Australia., Lehane AM; Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia., Dans MG; Burnet Institute, Melbourne, Victoria, 3004, Australia.; School of Medicine, Deakin University, Waurn Ponds, Victoria, 3216, Australia., de Koning-Ward TF; School of Medicine, Deakin University, Waurn Ponds, Victoria, 3216, Australia., Holien JK; St. Vincent's Institute of Medical Research, Melbourne, Victoria, 3065, Australia., Soares da Costa TP; La Trobe University, Melbourne, Victoria, 3086, Australia., Hulett MD; La Trobe University, Melbourne, Victoria, 3086, Australia., Buskes MJ; La Trobe University, Melbourne, Victoria, 3086, Australia., Crabb BS; Burnet Institute, Melbourne, Victoria, 3004, Australia.; Monash University, Melbourne, Victoria, 3800, Australia.; University of Melbourne, Melbourne, Victoria, 3010, Australia., Kirk K; Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia., Papenfuss AT; The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, 3052, Australia.; University of Melbourne, Melbourne, Victoria, 3010, Australia., Cowman AF; The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, 3052, Australia.; University of Melbourne, Melbourne, Victoria, 3010, Australia., Abbott BM; La Trobe University, Melbourne, Victoria, 3086, Australia.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2019 Jul 16; Vol. 9 (1), pp. 10292. Date of Electronic Publication: 2019 Jul 16.
DOI:	10.1038/s41598-019-46500-5
Abstrakt:	We developed a novel series of antimalarial compounds based on a 4-cyano-3-methylisoquinoline. Our lead compound MB14 achieved modest inhibition of the growth in vitro of the human malaria parasite, Plasmodium falciparum. To identify its biological target we selected for parasites resistant to MB14. Genome sequencing revealed that all resistant parasites bore a single point S374R mutation in the sodium (Na + ) efflux transporter PfATP4. There are many compounds known to inhibit PfATP4 and some are under preclinical development. MB14 was shown to inhibit Na + dependent ATPase activity in parasite membranes, consistent with the compound targeting PfATP4 directly. PfATP4 inhibitors cause swelling and lysis of infected erythrocytes, attributed to the accumulation of Na + inside the intracellular parasites and the resultant parasite swelling. We show here that inhibitor-induced lysis of infected erythrocytes is dependent upon the parasite protein RhopH2, a component of the new permeability pathways that are induced by the parasite in the erythrocyte membrane. These pathways mediate the influx of Na + into the infected erythrocyte and their suppression via RhopH2 knockdown limits the accumulation of Na + within the parasite hence protecting the infected erythrocyte from lysis. This study reveals a role for the parasite-induced new permeability pathways in the mechanism of action of PfATP4 inhibitors.
Databáze:	MEDLINE
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