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The effect of adipose tissue-derived stem cells in a middle cerebral artery occlusion stroke model depends on their engraftment rate

Grudzenski, Saskia ; Baier, Sebastian ; Ebert, Anne ; Pullens, Pim ; Lemke, Andreas ; Bieback, Karen ; Dijkhuizen, Rick M. ; Schad, Lothar R. ; Alonso, Angelika ; Hennerici, Michael G. ; Fatar, Marc

In: Stem cell research & therapy, 8 (2017), Nr. 96. pp. 1-14. ISSN 1757-6512

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Download (3MB) | Lizenz: Creative Commons LizenzvertragThe effect of adipose tissue-derived stem cells in a middle cerebral artery occlusion stroke model depends on their engraftment rate by Grudzenski, Saskia ; Baier, Sebastian ; Ebert, Anne ; Pullens, Pim ; Lemke, Andreas ; Bieback, Karen ; Dijkhuizen, Rick M. ; Schad, Lothar R. ; Alonso, Angelika ; Hennerici, Michael G. ; Fatar, Marc underlies the terms of Creative Commons Attribution 3.0 Germany

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Abstract

Background: In the field of experimental stem cell therapy, intra-arterial (IA) delivery yields the best results concerning, for example, migrated cell number at the targeted site. However, IA application also appears to be associated with increased mortality rates and infarction. Since many rodent studies systemically apply 1 × 106 cells, this could also be a consequence of engrafted cell number. The aim of this study was therefore to investigate the effect of different doses of adipose tissue-derived stem cells (ASCs) on engraftment rates and stroke outcome measured in vivo using 9.4-T high-field magnetic resonance imaging (MRI). Methods: Male Wistar rats (n = 43) underwent a middle cerebral artery occlusion (MCAo) for 45 or 90 min, followed by IA delivery of either saline or 1 × 106, 3 × 105, or 5 × 104 ASCs pre-labelled with very small superparamagnetic iron oxide particles (VSOPs). MRI (9.4-T) analysis was performed 48 h and 9 days post-MCAo. Lesion volumes were assessed by analysis of T2-weighted images and cell signal tracking showing cell engraftment and active cell migration by an improved T2*-analysis. Results: The ASC-derived signal intensity increased in the affected hemisphere 48 h post MCAo with injected cell number (p < 0.05). The analysis of stroke volumes revealed an increased infarction after injection of 1 × 106 ASCs compared to controls or application of 5 × 104 ASCs (p < 0.05). At 9 days post-MCAo, injection of 3 × 105 ASCs resulted in reduced infarct volumes (p < 0.05). Correspondingly, MRI analysis revealed no changes in cell numbers between both MRI examinations but showed active ASC migration to the site of infarction. Conclusion: Our results confirm that IA injection is an efficient way of targeting damaged brain tissue but its usefulness strongly depends on the right dose of delivered stem cells since this factor has a strong influence on migration rate and infarct volume, with better results for doses below 1 × 106 cells. Future challenges will include the determination of therapeutic doses for best cellular engraftment and stroke outcome.

Item Type: Article
Journal or Publication Title: Stem cell research & therapy
Volume: 8
Number: 96
Publisher: BioMed Central
Place of Publication: London
Date Deposited: 09 May 2017 08:30
Date: 2017
ISSN: 1757-6512
Page Range: pp. 1-14
Faculties / Institutes: Medizinische Fakultät Mannheim > Neurologische Klinik
Medizinische Fakultät Mannheim > Institut für Transfusionsmedizin und Immunologie
Medizinische Fakultät Mannheim > Zentrum für Biomedizin und Medizintechnik (CBTM)
Subjects: 610 Medical sciences Medicine
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