Thiazole orange: a new dye for Plasmodium species analysis.
A rapid sensitive method for the determination of Plasmodium falciparum in in vitro culture is presented. The technique employs a fluorescent flow cytometer equipped with a 15-mwatt argon laser that emits light at 488 nm and a membrane-permeable fluorochrome thiazole orange (TO) that stains RNA. Parasitized red cells are stained by suspending them in 1 ml of phosphate-buffered saline (PBS) containing 10(-5) M of TO and incubating this mixture for 15 min in the dark at room temperature. The stained cells may be analyzed fresh or after fixation with 1% paraformaldehyde/PBS or 0.25% glutaraldehyde/PBS. Alternatively the cells may be fixed first and then stained. There is excellent correspondence between the number of fluorescent-labeled parasitized red cells and Giemsa-stained cells.
Makler
M T
MT
Laboratory Service, Veterans Administration Medical Center, Portland, Oregon 97201.
Lee
L G
LG
Recktenwald
D
D
D000818:Animals; D001399:Azure Stains; D052160:Benzothiazoles; D004912:Erythrocytes / Q000469:parasitology; D005434:Flow Cytometry; D005456:Fluorescent Dyes; D006801:Humans; D008288:Malaria / Q000469:parasitology; D010963:Plasmodium falciparum / Q000302:isolation & purification*; D011804:Quinolines; D013844:Thiazoles
D001399:Azure Stains; D052160:Benzothiazoles; D005456:Fluorescent Dyes; D011804:Quinolines; D013844:Thiazoles; C051000:thiazole orange