PT  - JOURNAL ARTICLE
AU  - Jacob Golenser
AU  - Abraham Domb
AU  - Doron Teomim
AU  - Appolinaire Tsafack
AU  - Orna Nisim
AU  - Prem Ponka
AU  - Wijnand Eling
AU  - Z. Ioav Cabantchik
TI  - The Treatment of Animal Models of Malaria with Iron Chelators by Use of a Novel Polymeric Device for Slow Drug Release
DP  - 1997 Jun 01
TA  - Journal of Pharmacology and Experimental Therapeutics
PG  - 1127--1135
VI  - 281
IP  - 3
4099  - http://jpet.aspetjournals.org/content/281/3/1127.short
4100  - http://jpet.aspetjournals.org/content/281/3/1127.full
SO  - J Pharmacol Exp Ther1997 Jun 01; 281
AB  - The hydrophilic desferrioxamine (DFO) and the lipophilic salicylaldehyde isonicotinoyl hydrazone (SIH) are iron chelators which inhibit in vitro proliferation of Plasmodium falciparum with similar potency (IC50 ∼20 μM in 24- to 48-h tests). The in vivo assessment of these drugs was performed on Swiss mice infected withPlasmodium vinckei petteri with novel modes of drug administration and release. The drugs were delivered postpatently either by multiple i.p. injections or by a single i.p. or s.c. insertion of a drug-containing polymeric device which released most of the drug within 7 days at apparently first-order rates. A regimen of three daily i.p injections of 5 mg DFO for 3 consecutive days or a 70-mg dose of the drug given as an i.p. or s.c. polymer implant evoked similar delay and reduction in peak parasitemias and reduced mortality with no apparent signs of toxicity. Relatively faster, but otherwise similar results were obtained with the less hydrophilic SIH. In combination, the two drugs apparently potentiated each other. The polymeric devices were particularly useful for treatingPlasmodium berghei K173-infected C57Blmice, a suggested model of cerebral malaria, in which classical methods of DFO delivery were ineffective. The insertion of a 140-mg DFO-containing device on day 6 postinfection (parasitemia ∼1%) led to a marked reduction in parasite proliferation, appearance of neurological sequelae and mortality of mice. Our studies indicate that polymeric devices for slow drug release might be highly advantageous for both hydrophilic and lipophilic drugs whose antimalarial efficacy might depend on the maintenance of sustained blood levels. The results obtained with slow-release devices have implications for malaria chemotherapy as well as for iron chelation therapy in iron overload conditions. The American Society for Pharmacology and Experimental Therapeutics