title: Relative uptake of technetium 99m stannous colloid by neutrophils and monocytes is altered by gram-negative infection.
abstract: Gram-negative infection alters phagocytic cell function; hence, it could affect phagocytic uptake of inorganic colloids by these cells. Neutrophil and monocyte uptake of technetium 99m stannous colloid (99mTc SnC) in whole blood was measured in 10 patients with gram-negative infection (Burkholderia pseudomallei) and 7 controls. Mean uptake per individual neutrophil was reduced in infection. Uptake per monocyte was not significantly different. Blood from six normal individuals was incubated with lysed B. pseudomallei and colloid, which showed reduced neutrophil uptake, but increased monocyte uptake. These results indicate that uptake of 99mTc SnC stannous colloid can be used to measure alteration in phagocytic cell function. They suggest that infection with B. pseudomallei is associated with reduced phagocytosis by individual neutrophils, possibly through toxic effects of bacterial products. This could have immunopathogenic consequences for this gram-negative infection and may explain why it responds to granulocyte colony-stimulating factor.
authors.affiliation: Department of Nuclear Medicine, The Mater Hospital, Townsville, QLD, Australia.
authors.forename: Stuart C
authors.initials: SC
authors.lastname: Ramsay
authors.forename: Jacqueline A
authors.initials: JA
authors.lastname: Maggs
authors.forename: Natkunam
authors.initials: N
authors.lastname: Ketheesan
authors.forename: Robert
authors.initials: R
authors.lastname: Norton
authors.forename: Justin
authors.initials: J
authors.lastname: LaBrooy
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016957:Burkholderia pseudomallei / Q000254:growth & development; D005260:Female; D006801:Humans; D008297:Male; D008554:Melioidosis / Q000097:blood* / Q000000981:diagnostic imaging* / Q000382:microbiology; D008875:Middle Aged; D009000:Monocytes / Q000000981:diagnostic imaging* / Q000378:metabolism* / Q000382:microbiology; D009504:Neutrophils / Q000000981:diagnostic imaging* / Q000378:metabolism* / Q000382:microbiology; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics; D017556:Technetium Compounds / Q000493:pharmacokinetics*; D017971:Tin Compounds / Q000493:pharmacokinetics*
chemical_list: D019275:Radiopharmaceuticals; D017556:Technetium Compounds; D017971:Tin Compounds; C033493:technetium Tc 99m tin colloid