Ex Vivo Cell Labeling with 64Cu-pyruvaldehyde-bis(N4-methylthiosemicarbazone) for Imaging Cell Trafficking in Mice with Positron-emission Tomography

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2002 Feb 28

PMID 11867752

Citations 121

Authors

Nona Adonai

Nora Adonai

Khoi N Nguyen

Joseph Walsh

M Iyer

Tatsushi Toyokuni

Michael E Phelps

Timothy McCarthy

Deborah W McCarthy

Sanjiv Sam Gambhir

Affiliations

Soon will be listed here.

Abstract

We have used copper-64-pyruvaldehyde-bis(N4-methylthiosemicarbazone) (64Cu-PTSM) to radiolabel cells ex vivo for in vivo positron-emission tomography (PET) imaging studies of cell trafficking in mice and for eventual application in patients. 2-[18F]-Fluoro-2-deoxy-d-glucose (FDG) cell labeling also was evaluated for comparison. 64Cu-PTSM uptake by C6 rat glioma (C6) cells increased for 180 min and then stabilized. The labeling efficiency was directly proportional to 64Cu-PTSM concentration and influenced negatively by serum. Label uptake per cell was greater with 64Cu-PTSM than with FDG. However, both 64Cu-PTSM- and FDG-labeled cells showed efflux of cell activity into supernatant. The 64Cu-PTSM labeling procedure did not interfere significantly with C6 cell viability and proliferation rate. MicroPET images of living mice indicate that tail-vein-injected labeled C6 cells traffic to the lungs and liver. In addition, transient splenic accumulation of radioactivity was clearly detectable in a mouse scanned at 3.33 h postinfusion of 64Cu-PTSM-labeled lymphocytes. In contrast, the liver was the principal organ of tracer localization after tail-vein administration of 64Cu-PTSM alone. These results indicate that in vivo imaging of cell trafficking is possible with 64Cu-PTSM-labeled cells. Given the longer t(1/2) of 64Cu (12.7 h) relative to 18F (110 min), longer cell-tracking periods (up to 24-36 h) should be possible now with PET.

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