Transferrin receptor imaging for tracing mesenchymal stem cells implanted in the spinal cord / 南方医科大学学报
Journal of Southern Medical University
;
(12): 1318-1322, 2007.
Article
in Chinese
| WPRIM
| ID: wpr-283141
ABSTRACT
<p><b>OBJECTIVE</b>To explore the feasibility of tracing mesenchymal stem cells in vivo with scintigraphy.</p><p><b>METHODS</b>Transferrin receptor expression of cultured mesenchymal stem cells (hMSCs) was quantified with radioligand-receptor binding assay before the cells were transplanted into the spinal cord of rabbits. (131)I-labeled transferrin was then administered into the subarachnoid space of the rabbits, and scintigraphic images were acquired with a gamma camera at different time points after the administration. In the control experiments, (131)I-labeled human serum albumin was used in stead of (131)I-transferrin as the tracer, or only PBS was injected without stem cell transplantation. The images were semi-quantitatively analyzed with region of interest (ROI) techniques, and the phosphor imaging on the spinal sections were performed.</p><p><b>RESULTS</b>Radioligand-receptor binding assay showed 10 770 binding sites with high affinity (KD=0.982 nmol/L) for Fe saturated transferrin on each human mesenchymal cell. Visible accumulation of radioactivity at the cell transplantation sites was observed 16 h and 24 h after intrathecal injection of (131)I-transferrin tracer, but not in two control groups. ROI analysis showed that the difference between (131)I-transferrin and the control groups was statistically significant (P<0.05). Phosphor imaging further verified that it was the specific coupling of transferrin to the implanted cells that resulted in radioactivity accumulation at the transplantation sites.</p><p><b>CONCLUSIONS</b>Transferrin receptor imaging is capable of in vivo tracing of the implanted stem cells, and has the potential for use in non-invasive monitoring for stem cell transplantation therapy after further technical improvements.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Spinal Cord
/
Autoradiography
/
Receptors, Transferrin
/
Transferrin
/
Diagnostic Imaging
/
Tomography, Emission-Computed, Single-Photon
/
Cell Survival
/
Chemistry
/
Gene Expression Regulation
/
Feasibility Studies
Type of study:
Diagnostic study
Limits:
Animals
/
Female
/
Humans
Language:
Chinese
Journal:
Journal of Southern Medical University
Year:
2007
Type:
Article
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