title: Labelling of leukocytes with 99mTc-HMPAO for scintigraphy of inflammatory lesions and abscesses.
abstract: A simplified and efficient procedure for 99mTc-HMPAO-labelling of leukocytes is described. For this purpose, the pH and concentration of the 99mTc-HMPAO preparation was modified. Leukocytes were isolated from a 20 mL mixture of patient blood, 5 mL ACD and 0.8 mL methylcellulose after 1 h sedimentation of erythrocytes and centrifugation (at 400 g) of the obtained plasma layer. Simultaneously, 99mTc-HMPAO was prepared (one single-dose kit for two patients) by adding 2.2 mL 99mTc-generator eluate and, after 10 min, 0.3 mL of phosphate buffer to lower the pH to 7. The isolated WBCs were then labelled by the addition of 1-1.2 mL of 99mTc-HMPAO solution and incubated for 20 min. The unbound tracer was then discarded, the labelled WBC washed and finally resuspended in autologous cell-free plasma. Leukocytes labelled by this procedure were used for scintigraphic localization of inflammatory lesions and abscesses in the gastro-intestinal tract. The labelling efficiency was 60 +/- 9%, with a separation yield of 55 +/- 11%.
authors.affiliation: Institute of Nuclear Sciences, Vinca, Belgrade, Yugoslavia.
authors.forename: N
authors.initials: N
authors.lastname: Vanlić-Razumenić
authors.forename: N
authors.initials: N
authors.lastname: Pujić
authors.forename: N
authors.initials: N
authors.lastname: Dedović
authors.forename: K
authors.initials: K
authors.lastname: Kostić
authors.forename: D
authors.initials: D
authors.lastname: Nastić-Mirić
mesh_terms: D000038:Abscess / Q000097:blood / Q000000981:diagnostic imaging*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007249:Inflammation / Q000097:blood / Q000000981:diagnostic imaging*; D007962:Leukocytes / Q000378:metabolism* / Q000502:physiology; D015609:Organotechnetium Compounds; D010091:Oximes; D011877:Radionuclide Imaging; D019690:Technetium Tc 99m Exametazime; D013997:Time Factors
chemical_list: D015609:Organotechnetium Compounds; D010091:Oximes; D019690:Technetium Tc 99m Exametazime