Cited by 154Neuroinflammation and Neurodegeneration MechanismsParkinson's Disease Mechanisms and TreatmentsNuclear Receptors and Signaling

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CD200-CD200R dysfunction exacerbates microglial activation and dopaminergic neurodegeneration in a rat model of Parkinson's disease

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Zhang, Shi, Wang, Xi-Jin, Tian, Li-Peng, Pan, Jing, Lu, Guo-Qiang, Zhang, Ying-Jie, Ding, Jian-Qing, Chen, Sheng-Di·2011·Journal of Neuroinflammation

Abstract

BACKGROUND: Increasing evidence suggests that microglial activation may participate in the aetiology and pathogenesis of Parkinson's disease (PD). CD200-CD200R signalling has been shown to be critical for restraining microglial activation. We have previously shown that expression of CD200R in monocyte-derived macrophages, induced by various stimuli, is impaired in PD patients, implying an intrinsic abnormality of CD200-CD200R signalling in PD brain. Thus, further in vivo evidence is needed to elucidate the role of malfunction of CD200-CD200R signalling in the pathogenesis of PD. METHODS: 6-hydroxydopamine (6-OHDA)-lesioned rats were used as an animal model of PD. CD200R-blocking antibody (BAb) was injected into striatum to block the engagement of CD200 and CD200R. The animals were divided into three groups, which were treated with 6-OHDA/Veh (PBS), 6-OHDA/CAb (isotype control antibody) or 6-OHDA/BAb, respectively. Rotational tests and immunohistochemistry were employed to evaluate motor deficits and dopaminergic neurodegeneration in animals from each group. HPLC analysis was used to measure monoamine levels in striatum. Morphological analysis and quantification of CD11b- (or MHC II-) immunoreactive cells were performed to investigate microglial activation and possible neuroinflammation in the substantia nigra (SN). Finally, ELISA was employed to assay protein levels of proinflammatory cytokines. RESULTS: Compared with 6-OHDA/CAb or 6-OHDA/Veh groups, rats treated with 6-OHDA/BAb showed a significant increase in counts of contralateral rotation and a significant decrease in TH-immunoreactive (TH-ir) neurons in SN. A marked decrease in monoamine levels was also detected in 6-OHDA/BAb-treated rats, in comparison to 6-OHDA/Veh-treated ones. Furthermore, remarkably increased activation of microglia as well as up-regulation of proinflammatory cytokines was found concomitant with dopaminergic neurodegeneration in 6-OHDA/BAb-treated rats. CONCLUSIONS: This study shows that deficits in the CD200-CD200R system exacerbate microglial activation and dopaminergic neurodegeneration in a 6-OHDA-induced rat model of PD. Our results suggest that dysfunction of CD200-CD200R signalling may be involved in the aetiopathogenesis of PD.

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Crossref · 10.1186/1742-2094-8-154

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Figure 1 BAb exacerbates 6-OHDA-induced behavioural deficits. Contralateral rotation measurements following administration of apomorphine in each experimental group are shown in bar graph at 7 days and 21 days post-6-OHDA injection. Data are presented as mean ±S.E.M (n = 5 rats/group). (#)Statistical differences from 6-OHDA/Veh- or 6-OHDA/CAb-treated animals are P < 0.001.
Figure 1 BAb exacerbates 6-OHDA-induced behavioural deficits. Contralateral rotation measurements following administration of apomorphine in each experimental group are shown in bar graph at 7 days and 21 days post-6-OHDA injection. Data are presented as mean ±S.E.M (n = 5 rats/group). (#)Statistical differences from 6-OHDA/Veh- or 6-OHDA/CAb-treated animals are P < 0.001.CC BY · PubMed Central
Figure 2 Neurodegeneration is exacerbated in the SN of hemi-parkinsonian rats. Animals (5 rats per groups) were sacrificed at 21-day post 6-OHDA injection to characterize and quantify loss of dopaminergic neurons in whole SN. (B-G) Representative sections (~24 sections per rat) of SN were immunostained with antibodies against tyrosine hydroxylase (TH). (B,E) SN of 6-OHDA/Veh group, (C,F) SN of 6-OHDA/CAb group, (D,G) SN of 6-OHDA/BAb group. The bottom photos (E-G) are higher magnifications of the cells in black rectangles of ipsilateral SN in the upper photos (B-D). Scale bar: 1 mm (B-D); scale bar: 50 μm (E-G). Arrows: neurons; arrowheads: fibers. (A) Stereological cell counts of total TH-ir neurons on the ipsilateral side of the SN are shown as a percentage of the cells on the contralateral side (n = 5/group, # P < 0.0001). All the results were obtained in a two-blinded procedure. No significant difference was found between the group treated with 6-OHDA/Veh and the group treated with 6-OHDA/CAb (P = 0.5108). Data are presented as mean ± S.E.M.
Figure 2 Neurodegeneration is exacerbated in the SN of hemi-parkinsonian rats. Animals (5 rats per groups) were sacrificed at 21-day post 6-OHDA injection to characterize and quantify loss of dopaminergic neurons in whole SN. (B-G) Representative sections (~24 sections per rat) of SN were immunostained with antibodies against tyrosine hydroxylase (TH). (B,E) SN of 6-OHDA/Veh group, (C,F) SN of 6-OHDA/CAb group, (D,G) SN of 6-OHDA/BAb group. The bottom photos (E-G) are higher magnifications of the cells in black rectangles of ipsilateral SN in the upper photos (B-D). Scale bar: 1 mm (B-D); scale bar: 50 μm (E-G). Arrows: neurons; arrowheads: fibers. (A) Stereological cell counts of total TH-ir neurons on the ipsilateral side of the SN are shown as a percentage of the cells on the contralateral side (n = 5/group, # P < 0.0001). All the results were obtained in a two-blinded procedure. No significant difference was found between the group treated with 6-OHDA/Veh and the group treated with 6-OHDA/CAb (P = 0.5108). Data are presented as mean ± S.E.M.CC BY · PubMed Central
Figure 3 Effects of BAb on microglial morphology and cell number in SN. Representative sections of SN in different groups were immunostained with antibodies against CD11b (a microglia marker) (D-I) and MHC II (a marker for activated microglia) (J-O) 21 days after 6-OHDA-injection. G-I and M-O are higher magnifications of the fields outlined by rectangles in D-F and J-L respectively. Scale bar: 500 μm in D-F and J-L; scale bar: 50 μm in G-I and M-O. Representative microglia in different stages (stage1-4) of CD11b immunostaining are shown in yellow circles (stage1: P1; stage2: P2; stage3: P3; stage4: P4), and a representative of stage 4 MHC II-ir microglia is shown in panel Q. Scale bar:10 μm in P1-P4 and Q. Microglia cell numbers and morphology were stereologically analyzed in each group. (A) Data represents average increase of CD11b-ir microglia cell number in ipsilateral SN as compared to contralateral SN (n = 5) ± S.E.M. #:P < 0.001. (B) Stereological quantification of each stage of CD11b-ir microglia is depicted as the average percentage distribution per group. # p < 0.001 compared to every other group. (C) Stereological quantification of stage 4 MHC II-ir cells throughout the SN from different experimental groups is shown in bar graph; n = 5, value = mean ± S.E.M. #: P < 0.001 significant difference compared to every other group.
Figure 3 Effects of BAb on microglial morphology and cell number in SN. Representative sections of SN in different groups were immunostained with antibodies against CD11b (a microglia marker) (D-I) and MHC II (a marker for activated microglia) (J-O) 21 days after 6-OHDA-injection. G-I and M-O are higher magnifications of the fields outlined by rectangles in D-F and J-L respectively. Scale bar: 500 μm in D-F and J-L; scale bar: 50 μm in G-I and M-O. Representative microglia in different stages (stage1-4) of CD11b immunostaining are shown in yellow circles (stage1: P1; stage2: P2; stage3: P3; stage4: P4), and a representative of stage 4 MHC II-ir microglia is shown in panel Q. Scale bar:10 μm in P1-P4 and Q. Microglia cell numbers and morphology were stereologically analyzed in each group. (A) Data represents average increase of CD11b-ir microglia cell number in ipsilateral SN as compared to contralateral SN (n = 5) ± S.E.M. #:P < 0.001. (B) Stereological quantification of each stage of CD11b-ir microglia is depicted as the average percentage distribution per group. # p < 0.001 compared to every other group. (C) Stereological quantification of stage 4 MHC II-ir cells throughout the SN from different experimental groups is shown in bar graph; n = 5, value = mean ± S.E.M. #: P < 0.001 significant difference compared to every other group.CC BY · PubMed Central
Figure 4 BAb regulates pro-inflammatory factor production in SN. Concentrations of TNF-α and IL-6 in SN were assayed using ELISA at 21 days post-6-OHDA injection. Values are shown as mean ± S.E.M. The concentrations of cytokines in the 6-OHDA/BAb co-treated group were significantly higher than those in the other groups. There was no significant difference between the 6-OHDA/CAb- and the 6-OHDA/Veh-treated groups. Data are representative of three individual experiments. # P < 0.001, significant difference compared to every other group.
Figure 4 BAb regulates pro-inflammatory factor production in SN. Concentrations of TNF-α and IL-6 in SN were assayed using ELISA at 21 days post-6-OHDA injection. Values are shown as mean ± S.E.M. The concentrations of cytokines in the 6-OHDA/BAb co-treated group were significantly higher than those in the other groups. There was no significant difference between the 6-OHDA/CAb- and the 6-OHDA/Veh-treated groups. Data are representative of three individual experiments. # P < 0.001, significant difference compared to every other group.CC BY · PubMed Central

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Metadata

Authors
Zhang, S., Wang, X.-J., Tian, L.-P., Pan, J., Lu, G.-Q., Zhang, Y.-J., Ding, J.-Q., & Chen, S.-D.
Affiliations
Shanghai Jiao Tong University (CN)
Venue
Journal of Neuroinflammation
Published
2011-11-06
Volume
8
Issue
1
Pages
154-154
ISSN
1742-2094 (ISSN-L)
OpenAlex
W2033271712
Cited by
154
References
85
Citations by year
2026: 3 · 2025: 7 · 2024: 13 · 2023: 12 · 2022: 8 · 2021: 11 · 2020: 10 · 2019: 13 · 2018: 10 · 2017: 8 · 2016: 10 · 2015: 8 · 2014: 16 · 2013: 16 · 2012: 8
FWCI
7.24
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Neuroinflammation (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Clinical Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Receptors and Signaling
Keywords
Parkinson's disease, microglial activation, dopaminergic neuron loss, 6-hydroxydopamine lesion, substantia nigra, neuroinflammation, inflammatory cytokines, monoamine levels, motor impairment, striatum, neuroprotection, rat model
MeSH terms
Animals, Behavior, Animal, Disease Models, Animal, Dopamine, Humans, Male, Nerve Degeneration, Receptors, Immunologic, Antigens, CD, Oxidopamine, Rats, Sprague-Dawley, Microglia, Antibodies, Blocking, Parkinsonian Disorders, Rats, Dopaminergic Neurons

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