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Mesenchymal stem cells alleviate the early brain injury of subarachnoid hemorrhage partly by suppression of Notch1-dependent neuroinflammation: involvement of Botch

Liu, Wenchao, Li, Ran, Yin, Jian, Guo, Shenquan, Chen, Yunchang, Fan, Haiyan, Li, Gancheng, Li, Zhenjun, Li, Xifeng, Zhang, Xin, He, Xuying, Duan, Chuanzhi·2019·Journal of Neuroinflammation
DOI 10.1186/s12974-019-1396-5PMC PMC6334441
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Abstract

BACKGROUND: Activated microglia-mediated neuroinflammation has been regarded as an underlying key player in the pathogenesis of subarachnoid hemorrhage (SAH)-induced early brain injury (EBI). The therapeutic potential of bone marrow mesenchymal stem cells (BMSCs) transplantation has been demonstrated in several brain injury models and is thought to involve modulation of the inflammatory response. The present study investigated the salutary effects of BMSCs on EBI after SAH and the potential mechanism mediated by Notch1 signaling pathway inhibition. METHODS: cells) were transplanted intravenously into rats, and N-[N-(3,5-difluorophenacetyl-L-alanyl)]-S-phenylglycine t-butyl ester (DAPT), a Notch1 activation inhibitor, and Notch1 small interfering RNA (siRNA) were injected intracerebroventricularly. The effects of BMSCs on EBI were assayed by neurological score, brain water content (BWC), blood-brain barrier (BBB) permeability, magnetic resonance imaging, hematoxylin and eosin staining, and Fluoro-Jade C staining. Immunofluorescence and immunohistochemistry staining, Western blotting, and quantitative real-time polymerase chain reaction were used to analyze various proteins and transcript levels. Pro-inflammatory cytokines were measured by enzyme-linked immunosorbent assay. RESULTS: BMSCs treatment mitigated the neurobehavioral dysfunction, BWC and BBB disruption associated with EBI after SAH, reduced ionized calcium binding adapter molecule 1 and cluster of differentiation 68 staining and interleukin (IL)-1 beta, IL-6 and tumor necrosis factor alpha expression in the left hemisphere but concurrently increased IL-10 expression. DAPT or Notch1 siRNA administration reduced Notch1 signaling pathway activation following SAH, ameliorated neurobehavioral impairments, and BBB disruption; increased BWC and neuronal degeneration; and inhibited activation of microglia and production of pro-inflammatory factors. The augmentation of Notch1 signal pathway agents and phosphorylation of nuclear factor-κB after SAH were suppressed by BMSCs but the levels of Botch were upregulated in the ipsilateral hemisphere. Botch knockdown in BMSCs abrogated the protective effects of BMSCs treatment on EBI and the suppressive effects of BMSCs on Notch1 expression. CONCLUSIONS: BMSCs treatment alleviated neurobehavioral impairments and the inflammatory response in EBI after SAH; these effects may be attributed to Botch upregulation in brain tissue, which subsequently inhibited the Notch1 signaling pathway.

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Fig. 1 Identification of rat BMSCs and representative image of subarachnoid hemorrhage (SAH) model. Representative micrographs of BMSCs cultured at passage 0 (P0) and passage 3 (P3) (a). Flow cytometry analysis indicating positive BMSCs markers (CD29, CD44, CD90) and a negative marker (CD45) (b). Representative picture of brains from the Sham and SAH groups (c). A schematic indicating the optimal brain region for immunochemistry staining, qRT-PCR and western blotting (red circle) (d). CD, cluster of differentiation
Fig. 1 Identification of rat BMSCs and representative image of subarachnoid hemorrhage (SAH) model. Representative micrographs of BMSCs cultured at passage 0 (P0) and passage 3 (P3) (a). Flow cytometry analysis indicating positive BMSCs markers (CD29, CD44, CD90) and a negative marker (CD45) (b). Representative picture of brains from the Sham and SAH groups (c). A schematic indicating the optimal brain region for immunochemistry staining, qRT-PCR and western blotting (red circle) (d). CD, cluster of differentiationCC BY · PubMed Central
Fig. 2 The effect of BMSCs transplantation on neurological function, brain edema, BBB disruption and neuronal degeneration after SAH. BMSCs treatment significantly improved neurological function (a) (n = 12/group) and reduced BWC both at 24 and 72 h post-SAH (b) (n = 6/group). Representative images of H&E staining (c) and T2-weighted MRI images (d) showing alterations in lesion volume after BMSCs treatment. The quantification of Evans Blue dye extravasation (e) (n = 6/group). Typical Fluoro-Jade C (FJC) and NeuN (neuronal marker) staining images and quantitative analysis of FJC-positive cells from the injured hemisphere (f) (n = 6/group). Data are expressed as the mean ± SEM. *P < 0.05, **P < 0.01 versus Sham, #P < 0.05, ##P < 0.01 versus SAH + PBS group. Scale bar = 50 μm. BS brain stem, Cb cerebellum, LH left hemisphere, RH right hemisphere, POD post-operative day
Fig. 2 The effect of BMSCs transplantation on neurological function, brain edema, BBB disruption and neuronal degeneration after SAH. BMSCs treatment significantly improved neurological function (a) (n = 12/group) and reduced BWC both at 24 and 72 h post-SAH (b) (n = 6/group). Representative images of H&E staining (c) and T2-weighted MRI images (d) showing alterations in lesion volume after BMSCs treatment. The quantification of Evans Blue dye extravasation (e) (n = 6/group). Typical Fluoro-Jade C (FJC) and NeuN (neuronal marker) staining images and quantitative analysis of FJC-positive cells from the injured hemisphere (f) (n = 6/group). Data are expressed as the mean ± SEM. *P < 0.05, **P < 0.01 versus Sham, #P < 0.05, ##P < 0.01 versus SAH + PBS group. Scale bar = 50 μm. BS brain stem, Cb cerebellum, LH left hemisphere, RH right hemisphere, POD post-operative dayCC BY · PubMed Central
Fig. 3 BMSCs treatment suppressed microglial activation and downregulated production of inflammatory cytokines IL-6, IL-1β, and TNF-α at 24 and 72 h post-SAH. Representative images of ionized calcium binding adapter molecule1 (Iba1)- and CD68-positive cells in the Sham, SAH + PBS, and SAH + BMSCs groups (a). BMSCs treatment decreased the expression of pro-inflammatory cytokines, IL-6 (b), IL-1β (c), and TNF-α (d) but elevated the expression of anti-inflammatory cytokine, IL-10 (e) in brain tissue both at 24 and 72 h post-SAH; n = 6 in each group; data are expressed as the mean ± SEM. **P < 0.01, ***P < 0.001 versus Sham, ##P < 0.01,###P < 0.001 versus SAH + PBS group. Scale bar = 50 μm
Fig. 3 BMSCs treatment suppressed microglial activation and downregulated production of inflammatory cytokines IL-6, IL-1β, and TNF-α at 24 and 72 h post-SAH. Representative images of ionized calcium binding adapter molecule1 (Iba1)- and CD68-positive cells in the Sham, SAH + PBS, and SAH + BMSCs groups (a). BMSCs treatment decreased the expression of pro-inflammatory cytokines, IL-6 (b), IL-1β (c), and TNF-α (d) but elevated the expression of anti-inflammatory cytokine, IL-10 (e) in brain tissue both at 24 and 72 h post-SAH; n = 6 in each group; data are expressed as the mean ± SEM. **P < 0.01, ***P < 0.001 versus Sham, ##P < 0.01,###P < 0.001 versus SAH + PBS group. Scale bar = 50 μmCC BY · PubMed Central
Fig. 4 Time course of Notch1 and NICD expression in the left cortex after SAH. Representative images of Western blot data showing that endogenous Notch1 and NICD began to increase at 3 h and reached their highest expression at 24 h post-SAH (a). Quantification of Notch1 (b) and NICD (c) expression in the left cerebral cortex after SAH; n = 6 in each group; data are expressed as the mean ± SEM. **P < 0.01 versus Sham. Representative images of double immunofluorescence staining for NICD and Iba1 showing the co-localization of NICD with Iba1-positive microglia (d) in the left cerebral cortex at 24 h post-SAH. Scale bar = 50 μm. NICD Notch1 intracellular receptor domain
Fig. 4 Time course of Notch1 and NICD expression in the left cortex after SAH. Representative images of Western blot data showing that endogenous Notch1 and NICD began to increase at 3 h and reached their highest expression at 24 h post-SAH (a). Quantification of Notch1 (b) and NICD (c) expression in the left cerebral cortex after SAH; n = 6 in each group; data are expressed as the mean ± SEM. **P < 0.01 versus Sham. Representative images of double immunofluorescence staining for NICD and Iba1 showing the co-localization of NICD with Iba1-positive microglia (d) in the left cerebral cortex at 24 h post-SAH. Scale bar = 50 μm. NICD Notch1 intracellular receptor domainCC BY · PubMed Central
Fig. 5 N-[N-(3,5-difluorophenacetyl-l-alanyl)]-S-phenylglycine t-butyl ester (DAPT) inhibited the protein expression of molecules in Notch1 pathway. Western blotting showing DAPT significantly reduced the expression of Notch1, NICD, RBP-Jκ, and Hes-1 (a), with quantitative analysis of Notch1 (b), NICD (c), RBP-Jκ (d), and Hes-1 (e) levels in left hemisphere at 24 h post-SAH; n = 6 in each group; data are expressed as the mean ± SEM. *P < 0.05 versus Sham, #P < 0.05 versus SAH + DMSO group. Representative microphotographs of immunofluorescence staining for NICD and Iba1 (f), and immunohistochemistry staining for RBP-Jκ and Hes-1 (g) in the left cerebral cortex at 24 h post-SAH. Scale bar = 50 μm. RBP-Jκ: Recombining binding protein suppressor of hairless; Hes-1: Hes family basic helix loop helix transcription factor 1
Fig. 5 N-[N-(3,5-difluorophenacetyl-l-alanyl)]-S-phenylglycine t-butyl ester (DAPT) inhibited the protein expression of molecules in Notch1 pathway. Western blotting showing DAPT significantly reduced the expression of Notch1, NICD, RBP-Jκ, and Hes-1 (a), with quantitative analysis of Notch1 (b), NICD (c), RBP-Jκ (d), and Hes-1 (e) levels in left hemisphere at 24 h post-SAH; n = 6 in each group; data are expressed as the mean ± SEM. *P < 0.05 versus Sham, #P < 0.05 versus SAH + DMSO group. Representative microphotographs of immunofluorescence staining for NICD and Iba1 (f), and immunohistochemistry staining for RBP-Jκ and Hes-1 (g) in the left cerebral cortex at 24 h post-SAH. Scale bar = 50 μm. RBP-Jκ: Recombining binding protein suppressor of hairless; Hes-1: Hes family basic helix loop helix transcription factor 1CC BY · PubMed Central
Fig. 6 Effects of DAPT on microglial activation, inflammatory factors production, brain edema, neurobehavioral deficits, and neuronal degeneration in SAH rats. Representative images of Iba1- and CD68-positive microglia in the Sham, SAH + DMSO, and SAH + DAPT groups (a). ELISA results indicating the levels of the pro-inflammatory factors IL-1β (b), IL-6 (c), and TNF-α (d) and the anti-inflammatory factor IL-10 (e) in the ipsilateral cerebral tissue at 24 h post-SAH; n = 6 in each group. DAPT treatment markedly reduced BWC (f) (n = 6/group) in the left hemisphere and increased modified Garcia score (g) (n = 12/group). Representative FJC and NeuN staining images (h) and quantitative analysis of FJC-positive cells (i) (n = 6/group) in the left cortex after SAH with DAPT or DMSO treatment. Data are expressed as the mean ± SEM. *P < 0.05, **P < 0.01, ***P < 0.001 versus Sham, #P < 0.05, ##P < 0.01, ###P < 0.001 versus SAH + DMSO group. Scale bar = 50 μm
Fig. 6 Effects of DAPT on microglial activation, inflammatory factors production, brain edema, neurobehavioral deficits, and neuronal degeneration in SAH rats. Representative images of Iba1- and CD68-positive microglia in the Sham, SAH + DMSO, and SAH + DAPT groups (a). ELISA results indicating the levels of the pro-inflammatory factors IL-1β (b), IL-6 (c), and TNF-α (d) and the anti-inflammatory factor IL-10 (e) in the ipsilateral cerebral tissue at 24 h post-SAH; n = 6 in each group. DAPT treatment markedly reduced BWC (f) (n = 6/group) in the left hemisphere and increased modified Garcia score (g) (n = 12/group). Representative FJC and NeuN staining images (h) and quantitative analysis of FJC-positive cells (i) (n = 6/group) in the left cortex after SAH with DAPT or DMSO treatment. Data are expressed as the mean ± SEM. *P < 0.05, **P < 0.01, ***P < 0.001 versus Sham, #P < 0.05, ##P < 0.01, ###P < 0.001 versus SAH + DMSO group. Scale bar = 50 μmCC BY · PubMed Central
Fig. 7 Effects of Notch1 siRNA on the expression of molecules in the Notch1 pathway at 24 h post-SAH. The qRT-PCR analysis of the efficiency of siRNA-mediated knockdown of Notch1 in ipsilateral cerebral cortex (a); n = 3 in each group; data are expressed as the mean ± SEM **P < 0.01 versus Sham, ##P < 0.01 versus SAH + Scramble siRNA group. The protein levels of Notch1 pathway-related agents were assessed by Western blot (b) and quantification of Notch1 (c), NICD (d), RBP-Jκ (e), and Hes-1 (f) at 24 h post-SAH; n = 6 in each group; data are expressed as the mean ± SEM. *P < 0.05 versus Sham, #P < 0.05, ##P < 0.01 versus SAH + Scramble siRNA group. Representative images of NICD- and Iba1-positive cells (g) and immunohistochemistry staining for RBP-Jκ and Hes-1 (h) showing that Notch1 siRNA reduced the levels of NICD, RBP-Jκ and Hes-1 in ipsilateral cerebral cortex. Scale bar = 50 μm
Fig. 7 Effects of Notch1 siRNA on the expression of molecules in the Notch1 pathway at 24 h post-SAH. The qRT-PCR analysis of the efficiency of siRNA-mediated knockdown of Notch1 in ipsilateral cerebral cortex (a); n = 3 in each group; data are expressed as the mean ± SEM **P < 0.01 versus Sham, ##P < 0.01 versus SAH + Scramble siRNA group. The protein levels of Notch1 pathway-related agents were assessed by Western blot (b) and quantification of Notch1 (c), NICD (d), RBP-Jκ (e), and Hes-1 (f) at 24 h post-SAH; n = 6 in each group; data are expressed as the mean ± SEM. *P < 0.05 versus Sham, #P < 0.05, ##P < 0.01 versus SAH + Scramble siRNA group. Representative images of NICD- and Iba1-positive cells (g) and immunohistochemistry staining for RBP-Jκ and Hes-1 (h) showing that Notch1 siRNA reduced the levels of NICD, RBP-Jκ and Hes-1 in ipsilateral cerebral cortex. Scale bar = 50 μmCC BY · PubMed Central
Fig. 8 Effects of Notch1 siRNA on the microglial activation, inflammatory cytokines production, BWC, modified Garcia scores, and neuronal injury after 24 h SAH. Notch1 siRNA decreased Iba1- and CD68-positive cells in the left cerebral cortex at 24 h post-SAH (a). The protein levels of the proinflammatory cytokines IL-1β (b), IL-6 (c), and TNF-α (d) were decreased while the levels of the anti-inflammatory cytokine IL-10 (e) were increased in the SAH + Notch1 siRNA group compared with the SAH + Scramble siRNA group; n = 6 in each group. Notch1 siRNA treatment significantly alleviated BWC (f) (n = 6/group) in the left hemisphere and increased modified Garcia score (g) (n = 12/group) at 24 h post-SAH, representative FJC and NeuN staining images (h), and quantitative analysis of FJC-positive cells (i) (n = 6/group) in the left cortex after SAH with Notch1 siRNA injection. Data are expressed as the mean ± SEM. *P < 0.05, **P < 0.01, ***P < 0.001 versus Sham, #P < 0.05, ##P < 0.01, ###P < 0.001 versus SAH + Scramble siRNA group. Scale bar = 50 μm
Fig. 8 Effects of Notch1 siRNA on the microglial activation, inflammatory cytokines production, BWC, modified Garcia scores, and neuronal injury after 24 h SAH. Notch1 siRNA decreased Iba1- and CD68-positive cells in the left cerebral cortex at 24 h post-SAH (a). The protein levels of the proinflammatory cytokines IL-1β (b), IL-6 (c), and TNF-α (d) were decreased while the levels of the anti-inflammatory cytokine IL-10 (e) were increased in the SAH + Notch1 siRNA group compared with the SAH + Scramble siRNA group; n = 6 in each group. Notch1 siRNA treatment significantly alleviated BWC (f) (n = 6/group) in the left hemisphere and increased modified Garcia score (g) (n = 12/group) at 24 h post-SAH, representative FJC and NeuN staining images (h), and quantitative analysis of FJC-positive cells (i) (n = 6/group) in the left cortex after SAH with Notch1 siRNA injection. Data are expressed as the mean ± SEM. *P < 0.05, **P < 0.01, ***P < 0.001 versus Sham, #P < 0.05, ##P < 0.01, ###P < 0.001 versus SAH + Scramble siRNA group. Scale bar = 50 μmCC BY · PubMed Central
Fig. 9 BMSCs transplantation inhibited SAH-induced upregulation of the Notch1 pathway-related molecules, Notch1, NICD, RBP-Jκ, and Hes-1 at 24 and 72 h post-SAH. Representative image of Western blotting (a) and quantification of Notch1 (b), NICD (c), RBP-Jκ (d), and Hes-1 (e) protein levels after BMSCs treatment at 24 and 72 h post-SAH; n = 6 in each group; data are expressed as the mean ± SEM. *P < 0.05 versus Sham, #P < 0.05, ##P < 0.01 versus SAH+ PBS group. The qRT-PCR analysis of Notch1 (f), RBP-Jκ (g), and Hes-1 (h) mRNA levels at 24 and 72 h post-SAH; n = 3 in each group; data are expressed as the mean ± SEM. *P < 0.05, **P < 0.01, ***P < 0.001 versus Sham, #P < 0.05, ##P < 0.01, ###P < 0.001 versus SAH + PBS group. Typical images of double-immunofluorescence staining for NICD and Iba1 (i) showing that BMSCs treatment suppressed NICD expression in Iba1-positive microglia at 24 and 72 h post-SAH. Scale bar = 50 μm
Fig. 9 BMSCs transplantation inhibited SAH-induced upregulation of the Notch1 pathway-related molecules, Notch1, NICD, RBP-Jκ, and Hes-1 at 24 and 72 h post-SAH. Representative image of Western blotting (a) and quantification of Notch1 (b), NICD (c), RBP-Jκ (d), and Hes-1 (e) protein levels after BMSCs treatment at 24 and 72 h post-SAH; n = 6 in each group; data are expressed as the mean ± SEM. *P < 0.05 versus Sham, #P < 0.05, ##P < 0.01 versus SAH+ PBS group. The qRT-PCR analysis of Notch1 (f), RBP-Jκ (g), and Hes-1 (h) mRNA levels at 24 and 72 h post-SAH; n = 3 in each group; data are expressed as the mean ± SEM. *P < 0.05, **P < 0.01, ***P < 0.001 versus Sham, #P < 0.05, ##P < 0.01, ###P < 0.001 versus SAH + PBS group. Typical images of double-immunofluorescence staining for NICD and Iba1 (i) showing that BMSCs treatment suppressed NICD expression in Iba1-positive microglia at 24 and 72 h post-SAH. Scale bar = 50 μmCC BY · PubMed Central
Fig. 10 Effects of BMSCs treatment on the expression of Botch in brain tissue at 24 and 72 h post-SAH. The qRT-PCR analysis of the Botch mRNA level showed that Botch was upregulated in SAH + BMSCs group compared with SAH + PBS group at 24 h post-SAH (a); n = 3 in each group; data expressed as the mean ± SEM. **P < 0.01 versus Sham, ##P < 0.01 versus SAH + PBS group. Western blot data showed that BMSCs treatment significantly increased the protein levels of Botch in left cortex at 24 h post-SAH (b); n = 6 in each group; data are expressed as the mean ± SEM. **P < 0.01 versus Sham, #P < 0.05 versus SAH + PBS group (c). The qRT-PCR and Western blotting analysis of Botch protein and mRNA levels in the left cortex showed no obvious upregulation in BMSCs treatment group at 72 h post-SAH
Fig. 10 Effects of BMSCs treatment on the expression of Botch in brain tissue at 24 and 72 h post-SAH. The qRT-PCR analysis of the Botch mRNA level showed that Botch was upregulated in SAH + BMSCs group compared with SAH + PBS group at 24 h post-SAH (a); n = 3 in each group; data expressed as the mean ± SEM. **P < 0.01 versus Sham, ##P < 0.01 versus SAH + PBS group. Western blot data showed that BMSCs treatment significantly increased the protein levels of Botch in left cortex at 24 h post-SAH (b); n = 6 in each group; data are expressed as the mean ± SEM. **P < 0.01 versus Sham, #P < 0.05 versus SAH + PBS group (c). The qRT-PCR and Western blotting analysis of Botch protein and mRNA levels in the left cortex showed no obvious upregulation in BMSCs treatment group at 72 h post-SAHCC BY · PubMed Central
Fig. 11 Botch shRNA-mediated knockdown of Botch in BMSCs abolished their protection of EBI after SAH. The efficiency of shRNA-mediated knockdown of Botch in BMSCs was confirmed by qRT-PCR (a) (n = 3/group) and Western blotting (b) (n = 6/group). Data are expressed as the mean ± SEM. **P < 0.01 versus BMSCs group, #P < 0.05, ##P < 0.01versus BMSCs sh-NC group (c). Representative images of Western blot data showing the expression of Botch and Notch1 in SAH + PBS, SAH + BMSCs, and SAH + BMSCs sh-Botch groups (d). Quantitative analyses of Botch (e) and Notch1 (f) expression indicating that BMSCs sh-Botch transplantation significantly decreased Botch expression in brain tissue at 24 h post-SAH but increased Notch1 expression; n = 6 in each group; data are expressed as the mean ± SEM. *P < 0.05 versus SAH + PBS group, #P < 0.05 versus SAH + BMSCs group. BMSCs sh-Botch treatment accelerated neurobehavioral deficits (g) and BWC (h) compared with BMSCs treatment group; n = 6 in each group; data are expressed as the mean ± SEM. #P < 0.05, ##P < 0.01 versus SAH + PBS group, &P < 0.05 versus SAH + BMSCs group
Fig. 11 Botch shRNA-mediated knockdown of Botch in BMSCs abolished their protection of EBI after SAH. The efficiency of shRNA-mediated knockdown of Botch in BMSCs was confirmed by qRT-PCR (a) (n = 3/group) and Western blotting (b) (n = 6/group). Data are expressed as the mean ± SEM. **P < 0.01 versus BMSCs group, #P < 0.05, ##P < 0.01versus BMSCs sh-NC group (c). Representative images of Western blot data showing the expression of Botch and Notch1 in SAH + PBS, SAH + BMSCs, and SAH + BMSCs sh-Botch groups (d). Quantitative analyses of Botch (e) and Notch1 (f) expression indicating that BMSCs sh-Botch transplantation significantly decreased Botch expression in brain tissue at 24 h post-SAH but increased Notch1 expression; n = 6 in each group; data are expressed as the mean ± SEM. *P < 0.05 versus SAH + PBS group, #P < 0.05 versus SAH + BMSCs group. BMSCs sh-Botch treatment accelerated neurobehavioral deficits (g) and BWC (h) compared with BMSCs treatment group; n = 6 in each group; data are expressed as the mean ± SEM. #P < 0.05, ##P < 0.01 versus SAH + PBS group, &P < 0.05 versus SAH + BMSCs groupCC BY · PubMed Central

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Authors
Liu, W., Li, R., Yin, J., Guo, S., Chen, Y., Fan, H., Li, G., Li, Z., Li, X., Zhang, X., He, X., & Duan, C.
ORCID
Duan, Chuanzhi
Venue
Journal of Neuroinflammation
Publisher
Springer Science and Business Media LLC
Published
2019-01-15
Volume
16
Issue
1
ISSN
1742-2094
DOI
10.1186/s12974-019-1396-5
PMC
PMC6334441
Cited by
80
References
76
Language
en
Licence
creativecommons.org/licenses/by/4.0/ (tdm)
Funders
  • Science and Technology Project Foundation of Guangdong province (ID0ESYAI13540)
  • Key Project of Clinical Research of Southern Medical University (ID0EI5AI13541)
  • National Key Research Development Program (ID0E5DBI13542)
  • Guangdong Provincial Clinical Medical Centre for Neurosurgery (ID0EUJBI13543)

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