title: Indium-111 platelet kinetics in normal human subjects: tropolone versus oxine methods.
abstract: The effect of labeling media on the kinetics of[111In]platelets was evaluated by performing a paired crossover study in eight normal human subjects using tropolone and oxine methods. Platelets were labeled in autologous plasma with [111In]tropolone (In-tr) and in ACD-saline with [111In]oxine (In-ox) and reinjected. Starting at 1 hr, ten blood samples were obtained over an 8-day period. The in vivo platelet recovery was higher at 1 hr and throughout the 8 days of study with In-tr and the gamma camera images showed less uptake in liver and spleen than with In-ox. When platelet life-span (PLS) was estimated using all ten samples, only linear regression showed that the platelet life-span was longer with In-tr (10.7 +/- 1.5) than with In-ox (9.5 +/- 0.8). When the PLS was estimated excluding the 1-hr sample point, the life-span of platelets was significantly longer with In-tr than with In-ox based on three out of four models of curve fitting. These results demonstrate that platelets labeled with In-tr in plasma are preserved better in circulation and have equal or longer life-span than platelets labeled with In-ox in ACD-saline.
mesh_terms: D000328:Adult; D001792:Blood Platelets; D002470:Cell Survival; D003508:Cycloheptanes; D005260:Female; D006801:Humans; D006912:Hydroxyquinolines; D007204:Indium; D008297:Male; D009942:Organometallic Compounds; D015125:Oxyquinoline / Q000031:analogs & derivatives; D011868:Radioisotopes; D013997:Time Factors; D014334:Tropolone
chemical_list: D003508:Cycloheptanes; D006912:Hydroxyquinolines; D009942:Organometallic Compounds; D011868:Radioisotopes; D007204:Indium; C032950:indium oxine; D015125:Oxyquinoline; D014334:Tropolone