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Novel (89)Zr cell labeling approach for PET-based cell trafficking studies.

Bansal A, Pandey MK, Demirhan YE, Nesbitt JJ, Crespo-Diaz RJ, Terzic A, Behfar A, DeGrado TR - EJNMMI Res (2015)

Bottom Line: The effect of labeling on cellular viability was tested by proliferation, trypan blue, and cytotoxicity/apoptosis assays.Radioactivity concentrations of labeled cells of up to 0.5 MBq/10(6) cells were achieved without a negative effect on cellular viability.We have developed a robust, general, and biostable (89)Zr-DBN-based cell labeling strategy with promise for wide applications of PET-based non-invasive in vivo cell trafficking.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Mayo Clinic, Rochester, 55905 MN USA.

ABSTRACT

Background: With the recent growth of interest in cell-based therapies and radiolabeled cell products, there is a need to develop more robust cell labeling and imaging methods for in vivo tracking of living cells. This study describes evaluation of a novel cell labeling approach with the positron emission tomography (PET) isotope (89)Zr (T 1/2 = 78.4 h). (89)Zr may allow PET imaging measurements for several weeks and take advantage of the high sensitivity of PET imaging.

Methods: A novel cell labeling agent, (89)Zr-desferrioxamine-NCS ((89)Zr-DBN), was synthesized. Mouse-derived melanoma cells (mMCs), dendritic cells (mDCs), and human mesenchymal stem cells (hMSCs) were covalently labeled with (89)Zr-DBN via the reaction between the NCS group on (89)Zr-DBN and primary amine groups present on cell surface membrane protein. The stability of the label on the cell was tested by cell efflux studies for 7 days. The effect of labeling on cellular viability was tested by proliferation, trypan blue, and cytotoxicity/apoptosis assays. The stability of label was also studied in in vivo mouse models by serial PET scans and ex vivo biodistribution following intravenous and intramyocardial injection of (89)Zr-labeled hMSCs. For comparison, imaging experiments were performed after intravenous injections of (89)Zr hydrogen phosphate ((89)Zr(HPO4)2).

Results: The labeling agent, (89)Zr-DBN, was prepared in 55% ± 5% decay-corrected radiochemical yield measured by silica gel iTLC. The cell labeling efficiency was 30% to 50% after 30 min labeling depending on cell type. Radioactivity concentrations of labeled cells of up to 0.5 MBq/10(6) cells were achieved without a negative effect on cellular viability. Cell efflux studies showed high stability of the radiolabel out to 7 days. Myocardially delivered (89)Zr-labeled hMSCs showed retention in the myocardium, as well as redistribution to the lung, liver, and bone. Intravenously administered (89)Zr-labeled hMSCs also distributed primarily to the lung, liver, and bone, whereas intravenous (89)Zr(HPO4)2 distributed to the liver and bone with no activity in the lung. Thus, the in vivo stability of the radiolabel on the hMSCs was evidenced.

Conclusions: We have developed a robust, general, and biostable (89)Zr-DBN-based cell labeling strategy with promise for wide applications of PET-based non-invasive in vivo cell trafficking.

No MeSH data available.


Related in: MedlinePlus

Comparison of cell population doubling times for89Zr-labeled and unlabeled mMCs, hMSCs and mDCs. The cells were plated at appropriate cell number at day 3, and CyQUANT assay was performed at day 7 post-labeling. No significant differences were observed between radiolabeled and unlabeled cells. Values are shown as mean ± standard deviation, n = 3.
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Fig2: Comparison of cell population doubling times for89Zr-labeled and unlabeled mMCs, hMSCs and mDCs. The cells were plated at appropriate cell number at day 3, and CyQUANT assay was performed at day 7 post-labeling. No significant differences were observed between radiolabeled and unlabeled cells. Values are shown as mean ± standard deviation, n = 3.

Mentions: The CyQUANT proliferation assay showed no difference in proliferation rate between unlabeled and 89Zr-labeled cells (Figure 2). Trypan blue cell viability tests were performed on radiolabeled cells immediately after labeling and up to 7 days post-labeling and compared with unlabeled cells. No change was observed in number of dead cells (blue-stained cells) over live cells (unstained cells) in both 89Zr-labeled and unlabeled cells, with percentage of dead cells <5% in all days tested.Figure 2


Novel (89)Zr cell labeling approach for PET-based cell trafficking studies.

Bansal A, Pandey MK, Demirhan YE, Nesbitt JJ, Crespo-Diaz RJ, Terzic A, Behfar A, DeGrado TR - EJNMMI Res (2015)

Comparison of cell population doubling times for89Zr-labeled and unlabeled mMCs, hMSCs and mDCs. The cells were plated at appropriate cell number at day 3, and CyQUANT assay was performed at day 7 post-labeling. No significant differences were observed between radiolabeled and unlabeled cells. Values are shown as mean ± standard deviation, n = 3.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4401478&req=5

Fig2: Comparison of cell population doubling times for89Zr-labeled and unlabeled mMCs, hMSCs and mDCs. The cells were plated at appropriate cell number at day 3, and CyQUANT assay was performed at day 7 post-labeling. No significant differences were observed between radiolabeled and unlabeled cells. Values are shown as mean ± standard deviation, n = 3.
Mentions: The CyQUANT proliferation assay showed no difference in proliferation rate between unlabeled and 89Zr-labeled cells (Figure 2). Trypan blue cell viability tests were performed on radiolabeled cells immediately after labeling and up to 7 days post-labeling and compared with unlabeled cells. No change was observed in number of dead cells (blue-stained cells) over live cells (unstained cells) in both 89Zr-labeled and unlabeled cells, with percentage of dead cells <5% in all days tested.Figure 2

Bottom Line: The effect of labeling on cellular viability was tested by proliferation, trypan blue, and cytotoxicity/apoptosis assays.Radioactivity concentrations of labeled cells of up to 0.5 MBq/10(6) cells were achieved without a negative effect on cellular viability.We have developed a robust, general, and biostable (89)Zr-DBN-based cell labeling strategy with promise for wide applications of PET-based non-invasive in vivo cell trafficking.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Mayo Clinic, Rochester, 55905 MN USA.

ABSTRACT

Background: With the recent growth of interest in cell-based therapies and radiolabeled cell products, there is a need to develop more robust cell labeling and imaging methods for in vivo tracking of living cells. This study describes evaluation of a novel cell labeling approach with the positron emission tomography (PET) isotope (89)Zr (T 1/2 = 78.4 h). (89)Zr may allow PET imaging measurements for several weeks and take advantage of the high sensitivity of PET imaging.

Methods: A novel cell labeling agent, (89)Zr-desferrioxamine-NCS ((89)Zr-DBN), was synthesized. Mouse-derived melanoma cells (mMCs), dendritic cells (mDCs), and human mesenchymal stem cells (hMSCs) were covalently labeled with (89)Zr-DBN via the reaction between the NCS group on (89)Zr-DBN and primary amine groups present on cell surface membrane protein. The stability of the label on the cell was tested by cell efflux studies for 7 days. The effect of labeling on cellular viability was tested by proliferation, trypan blue, and cytotoxicity/apoptosis assays. The stability of label was also studied in in vivo mouse models by serial PET scans and ex vivo biodistribution following intravenous and intramyocardial injection of (89)Zr-labeled hMSCs. For comparison, imaging experiments were performed after intravenous injections of (89)Zr hydrogen phosphate ((89)Zr(HPO4)2).

Results: The labeling agent, (89)Zr-DBN, was prepared in 55% ± 5% decay-corrected radiochemical yield measured by silica gel iTLC. The cell labeling efficiency was 30% to 50% after 30 min labeling depending on cell type. Radioactivity concentrations of labeled cells of up to 0.5 MBq/10(6) cells were achieved without a negative effect on cellular viability. Cell efflux studies showed high stability of the radiolabel out to 7 days. Myocardially delivered (89)Zr-labeled hMSCs showed retention in the myocardium, as well as redistribution to the lung, liver, and bone. Intravenously administered (89)Zr-labeled hMSCs also distributed primarily to the lung, liver, and bone, whereas intravenous (89)Zr(HPO4)2 distributed to the liver and bone with no activity in the lung. Thus, the in vivo stability of the radiolabel on the hMSCs was evidenced.

Conclusions: We have developed a robust, general, and biostable (89)Zr-DBN-based cell labeling strategy with promise for wide applications of PET-based non-invasive in vivo cell trafficking.

No MeSH data available.


Related in: MedlinePlus