TY - JOUR
T1 - Experimental conditions for testing the inhibitory activity of chloroquine on the formation of β-hematin
AU - Baelmans, R.
AU - Deharo, E.
AU - Muoz, V.
AU - Sauvain, M.
AU - Ginsburg, H.
PY - 2000
Y1 - 2000
N2 - Some antimalarial drugs act by inhibiting the process of ferriprotoporphyrin IX polymerization which protects the parasite against the noxious effect of this product of host cell hemoglobin digestion. As the quest for new drugs with a similar mode of action continues, high-throughput screening methods are needed. We demonstrate herein that such a recently described screening technique (Basilico et al., J. Antimicrob. Chemother. 42, 55-60, 1998) is considerably disturbed by certain ions. Thus, at the assay's pH 2.6, the phosphate ions are responsible for the inhibitory activity of chloroquine phosphate, rather than chloroquine itself. Using a combination of solubility tests and Fourier transform infrared spectrometry we also show that two alternative methods using higher pH's are also prone to salt effects and demonstrate that these can be minimized by extensive washing of the product with DMSO.
AB - Some antimalarial drugs act by inhibiting the process of ferriprotoporphyrin IX polymerization which protects the parasite against the noxious effect of this product of host cell hemoglobin digestion. As the quest for new drugs with a similar mode of action continues, high-throughput screening methods are needed. We demonstrate herein that such a recently described screening technique (Basilico et al., J. Antimicrob. Chemother. 42, 55-60, 1998) is considerably disturbed by certain ions. Thus, at the assay's pH 2.6, the phosphate ions are responsible for the inhibitory activity of chloroquine phosphate, rather than chloroquine itself. Using a combination of solubility tests and Fourier transform infrared spectrometry we also show that two alternative methods using higher pH's are also prone to salt effects and demonstrate that these can be minimized by extensive washing of the product with DMSO.
UR - http://www.scopus.com/inward/record.url?scp=0034475070&partnerID=8YFLogxK
U2 - 10.1006/expr.2000.4558
DO - 10.1006/expr.2000.4558
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C2 - 11162377
AN - SCOPUS:0034475070
SN - 0014-4894
VL - 96
SP - 243
EP - 248
JO - Experimental Parasitology
JF - Experimental Parasitology
IS - 4
ER -