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2014 ; 74
(20
): 5846-54
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gab.com Text
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In vivo localization of ??Y and ¹??Lu radioimmunoconjugates using Cerenkov
luminescence imaging in a disseminated murine leukemia model
#MMPMID25261237
Balkin ER
; Kenoyer A
; Orozco JJ
; Hernandez A
; Shadman M
; Fisher DR
; Green DJ
; Hylarides MD
; Press OW
; Wilbur DS
; Pagel JM
Cancer Res
2014[Oct]; 74
(20
): 5846-54
PMID25261237
show ga
Cerenkov radiation generated by positron-emitting radionuclides can be exploited
for a molecular imaging technique known as Cerenkov luminescence imaging (CLI).
Data have been limited, however, on the use of medium- to high-energy ?-emitting
radionuclides of interest for cancer imaging and treatment. We assessed the use
of CLI as an adjunct to determine localization of radioimmunoconjugates to
hematolymphoid tissues. Radiolabeled (177)Lu- or (90)Y-anti-CD45 antibody (Ab;
DOTA-30F11) was administered by tail vein injection to athymic mice bearing
disseminated murine myeloid leukemia, with CLI images acquired at times
afterward. Gamma counting of individual organs showed preferential uptake in
CD45(+) tissues with significant retention of radiolabeled Ab in sites of
leukemia (spleen and bone marrow). This result was confirmed in CLI images with
1.35 × 10(5) ± 2.2 × 10(4) p/s/cm(2)/sr and 3.45 × 10(3) ± 7.0 × 10(2)
p/s/cm(2)/sr for (90)Y-DOTA-30F11 and (177)Lu-DOTA-30F11, respectively, compared
with undetectable signal for both radionuclides using the nonbinding control Ab.
Results showed that CLI allows for in vivo visualization of localized
?-emissions. Pixel intensity variability resulted from differences in absorbed
doses of the associated energies of the ?-emitting radionuclide. Overall, our
findings offer a preclinical proof of concept for the use of CLI techniques in
tandem with currently available clinical diagnostic tools.