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programma & abstracts - Nederlandse Vereniging voor Radiologie

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Kinderradiologie/Diversen 7<br />

Figure 1<br />

O7.8<br />

CELLULAR IMAGING: IN VIVO ASSESSMENT<br />

OF GD- OR SPIO-LABELED CELL GRAFT<br />

VIABILITY, COMBINING MRI AND<br />

BIOLUMINESCENCE IMAGING<br />

J. Guenoun, A.R. Ruggiero, G. Doeswijk, G.A. Koning,<br />

G.P. Krestin, M.R. Bernsen<br />

Erasmus Medisch Centrum, Rotterdam<br />

Purpose: Using MRI mapping techniques to determine<br />

possible differences in R1, R2 or R2* relaxation rate of<br />

viable and non-viable transplanted rMSCs, labeled with Gd<br />

or SPIO .<br />

Using bioluminescence imaging to link changes in R1, R2 or<br />

R2* to cell viability.<br />

Materials and methods: Study type: experimental longitudinal<br />

follow up.<br />

Gd-DTPA was intraliposomal incorporated. Rat mesenchymal<br />

stem cells (rMSCs), expressing firefly luciferase, were labeled<br />

with SPIO or Gd-liposomes. Cells were divided in a viable<br />

and non-viable fraction (non-viable cells were acquired<br />

by repeated freeze-thawing). For in vivo studies, 5x105<br />

viable or non viable rMSCs were injected intramuscular and<br />

imaged with MRI and BLI at days 2, 5, 10, 15. T1, T2 and<br />

T2* mapping was performed on 3T. At end-point animals<br />

were sacrificed for immunofluorescent staining.<br />

Results: Irrelevant MRI signal from non-viable Gd-MSCs<br />

disappeared quickly (

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