title: Use of microphotohemolysis to distinguish differences in erythrocyte treatments.
abstract: A new microhemolytic assay was used to determine if this assay could distinguish between normal erythrocytes and those which had been experimentally altered. Solutions of erythrocytes (4% hematocrit in buffer with fluorescein isothiocyanate tagged to 150,000 MW dextran, FITC-DEX) were placed in a hemacytometer and epi-illumination with a Leitz fluorescent microscope was used to activate the fluorochrome. The resultant hemolysis that occurred only in the discrete area of activation was dependent on the total light energy used for activation (45-180 J/cm2). It was quantitated by an analysis of the amount of light transmittance through that area. The presence of glucose in the buffers decreased the rate of hemolysis and increased the time to reach 50% of the maximal response (T50). Erythrocytes treated with diamide had up to a fourfold increase in the rate of hemolysis and a 48% decrease in the T50, while chlorpromazine produced a 51% decrease in the T50 but had no effect on the rate of hemolysis. Gluteraldehyde produced a graded suppression of the hemolysis. These results demonstrate that the microphotohemolytic assay can be used with energy response curves to provide a relatively quick, quantitative determination of altered erythrocytes.
authors.affiliation: Center for Applied Microcirculatory Research, University of Louisville, Kentucky 40292.
authors.forename: F N
authors.initials: FN
authors.lastname: Miller
authors.forename: G J
authors.initials: GJ
authors.lastname: Tangelder
authors.forename: D W
authors.initials: DW
authors.lastname: Slaaf
authors.forename: R S
authors.initials: RS
authors.lastname: Reneman
mesh_terms: D000818:Animals; D002746:Chlorpromazine / Q000494:pharmacology; D003911:Dextrans / Q000494:pharmacology* / Q000528:radiation effects; D003958:Diamide / Q000494:pharmacology; D004307:Dose-Response Relationship, Radiation; D004912:Erythrocytes / Q000187:drug effects* / Q000528:radiation effects; D016650:Fluorescein-5-isothiocyanate / Q000494:pharmacology* / Q000528:radiation effects / Q000031:analogs & derivatives; D005947:Glucose / Q000494:pharmacology; D005976:Glutaral / Q000494:pharmacology; D006461:Hemolysis / Q000187:drug effects* / Q000528:radiation effects; D008027:Light; D008832:Microchemistry; D010782:Photolysis; D011817:Rabbits
chemical_list: D003911:Dextrans; C015219:fluorescein isothiocyanate dextran; D003958:Diamide; D016650:Fluorescein-5-isothiocyanate; D005947:Glucose; D005976:Glutaral; D002746:Chlorpromazine