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Intracerebral injection of human mesenchymal stem cells impacts cerebral microvasculature after experimental stroke: MRI study
Author(s) -
Moisan Anaïck,
Pannetier Nicolas,
Grillon Emmanuelle,
Richard MarieJeanne,
Fraipont Florence,
Rémy Chantal,
Barbier Emmanuel L.,
Detante Olivier
Publication year - 2012
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.2806
Subject(s) - medicine , mesenchymal stem cell , intracerebral hemorrhage , stroke (engine) , lesion , ischemia , middle cerebral artery , effective diffusion coefficient , thrombolysis , pathology , angiogenesis , anesthesia , magnetic resonance imaging , radiology , subarachnoid hemorrhage , mechanical engineering , myocardial infarction , engineering
Stroke, the leading cause of disability, lacks treatment beyond thrombolysis. The acute injection of human mesenchymal stem cells (hMSCs) provides a benefit which could be mediated by an enhancement of angiogenesis. A clinical autologous graft requires an hMSC culture delay incompatible with an acute administration. This study evaluates the cerebral microvascular changes after a delayed injection of hMSCs. At day 8 after middle cerebral artery occlusion (MCAo), two groups of rats received an intracerebral injection in the damaged brain of either 10 μL of cell suspension medium (MCAo‐PBS, n = 4) or 4 × 10 5 hMSCs (MCAo‐hMSC, n = 5). Two control groups of healthy rats underwent the same injection procedures in the right hemisphere (control‐PBS, n = 6; control‐hMSC, n = 5). The effect of hMSCs on the microvasculature was assessed by MRI using three parameters: apparent diffusion coefficient (ADC), cerebral blood volume (CBV) and vessel size index (VSI). At day 9, eight additional rats were euthanised for a histological study of the microvascular parameters (CBV, VSI and vascular fraction). No ADC difference was observed between MCAo groups. One day after intracerebral injection, hMSCs abolished the CBV increase observed in the lesion (MCAo‐hMSC: 1.7 ± 0.1% versus MCAo‐PBS: 2.2 ± 0.2%) and delayed the VSI increase (vasodilation) secondary to cerebral ischaemia. Histological analysis at day 9 confirmed that hMSCs modified the microvascular parameters (CBV, VSI and vascular fraction) in the lesion. No ADC, CBV or VSI differences were observed between control groups. At the stroke post‐acute phase, hMSC intracerebral injection rapidly and transiently modifies the cerebral microvasculature. This microvascular effect can be monitored in vivo by MRI. Copyright © 2012 John Wiley & Sons, Ltd.