Abstract
MRI was employed to follow the neurodegenerative foci and the localization of inflammatory cells by magnetically labeled CD4+ or CD8+ lymphocytes in the ischemia/reperfusion long-lived rats (9 and 13 months after 10 min of cardiac arrest). MRI of ischemic rats showed: (1) blood–brain barrier (BBB) leakage in the area of the dorsal hippocampus and brainstem-hindbrain level in basal cerebellum, (2) unlike anti-CD8 magnetic antibodies anti-CD4 ultra small paramagnetic iron oxide particles (USPIO) antibodies revealed hypointense areas in the brainstem-interbrain region and caudoputamen not found in animals that were not injected with USPIO antibodies, and (3) dilation in the retrosplenial area. Immunocytochemistry revealed microglial activation in the hippocampus and striatum, with indications of activation in thalamic lateral dorsal nuclei and the subventricular zone. In the CA1 and CA3 regions, it was noted that OX42- and ED1-positive granules appear in neuronal somata. Immunostaining of lymphocytes with TCR confirmed the T-cell presence in ischemic brain parenchyma of the hippocampus and striatum. The above observations thus point to a persistent dysfunction of BBB that in long-term may still lead to infiltration of T cells that are predominantly of helper (CD4+) type. Such inflammatory processes are backed by microglial activity even up to 1 year after ischemia/reperfusion. Moreover, in these animals an augmented expression of neurogenesis markers and neuroblast migration was also revealed in the subventricular zone. Thus, a balance of degenerative processes and inflammatory surveillance with neurogenesis could determine the long-term outcome of global ischemia survival or the previously proposed formation of amyloid plaques and Alzheimer’s-type dementia.
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Abbreviations
- BBB:
-
Blood–brain barrier
- CLIO:
-
Cross-linked iron oxide
- CNS:
-
Central nervous system
- DCX:
-
Doublecortin
- FITC-streptavidin:
-
Streptavidin labeled with fluorescein isothiocyanate
- FoW:
-
Field of view
- Gd-DTPA:
-
Gadolinium-diethylenetriaminepentaacetic acid
- MRI:
-
Magnetic resonance imaging
- PECAM:
-
Platelet endothelial cell adhesion molecule
- RF:
-
Radio frequency
- SPIO:
-
Small paramagnetic iron oxide particles
- SVZ:
-
Subventricular zone
- T1:
-
Longitudinal relaxation time
- T1W:
-
T1-weighted relaxation
- T2*:
-
Transversal relaxation time-“star” protocol
- T2*W:
-
T2*-weighted relaxation
- TCR:
-
T cell receptor
- TE:
-
Time to echo
- TR:
-
Repetition time
- TSE:
-
Turbo spin echo protocol
- USPIO:
-
Ultra small paramagnetic iron oxide particles
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Acknowledgments
The authors are grateful to Dr. Goran Bačić for his continuous expert support in designing and analyzing MRI experiments. This study was supported by grant of Ministry of Science and Technological Development Republic of Serbia (Grant No. 41005), funds from Mossakowski Medical Research Centre (T5), Polish Ministry of Science and Higher Education (2007–2010-Cost/253/2006), and ESF-COST Action B30.
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R. Pluta and P. R. Andjus contributed equally to this work.
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429_2011_336_MOESM1_ESM.mpg
Supplementary material 1 Online Resource 1. Animated reconstruction of the Z-stack of the image in Fig. 1e for the postischemic CA1 hippocampal region (optical slice thickness – 0.79 μm, number of slices – 52, stack size – 40.2 μm) (MPEG 621 kb)
429_2011_336_MOESM2_ESM.mpg
Supplementary material 2 Online Resource 2. Animated reconstruction of the Z-stack of the image in Fig. 1e for the postischemic striatal region (optical slice thickness – 1.99 μm, number of slices – 14, stack size – 25.9 μm) (MPEG 469 kb)
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Sekeljic, V., Bataveljic, D., Stamenkovic, S. et al. Cellular markers of neuroinflammation and neurogenesis after ischemic brain injury in the long-term survival rat model. Brain Struct Funct 217, 411–420 (2012). https://doi.org/10.1007/s00429-011-0336-7
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DOI: https://doi.org/10.1007/s00429-011-0336-7