Abstract
Pontine infarction is the major subtype of brainstem stroke causing severe neurological deficits. The pathophysiology and treatment of pontine infarction was rarely studied. A rat model of acute pontine infarction was established via injection of endothelin-1 in the pons. Single-cell RNA sequencing was applied to detect the cellular response in pontine infarction. Based on this finding, a potential treatment for pontine infarction targeting microglia was verified. Occlusion of penetrating artery caused by endothelin-1 led to pontine infarction. Single-cell RNA sequencing revealed a subtype of activated microglia, SPP1+ microglia, which were different from M1-like or M2-like depolarization. SPP1+ microglia interacted with oligodendrocytes and contributed to the demyelination of nerve tracts. Cyclin B1 regulated the proliferation of SPP1+ microglia. Cucurbitacin E, a cyclin B1 inhibitor, reduced the proliferation of SPP1+ microglia around the injured myelin sheath and alleviated the demyelination. Moreover, cucurbitacin E treatment decreased the ischemic infarction volume and neurological deficits after pontine infarction. SPP1+ microglia contributed to axonal demyelination in the pontine infarction, and inhibition of SPP1+ microglia provided neuroprotection for pontine infarction.
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Data Availability
The datasets generated during and/or analyzed during the current study are available in the GEO repository, https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE199066 and https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE199067.
Abbreviations
- MCAO:
-
middle cerebral artery occlusion
- CST:
-
corticospinal tracts
- ET-1:
-
endothelin
- scRNA-seq:
-
single-cell RNA sequencing
- TR:
-
repetition time
- DWI:
-
diffusion-weighted imaging
- PWI:
-
perfusion-weighted imaging
- fMOST:
-
fluorescence micro-optical sectioning tomography
- CCA:
-
canonical correlation analysis
- NC:
-
normal control
- OPCs:
-
oligodendrocytes
- CuE:
-
cucurbitacin E
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Acknowledgements
We thank Dr. Jiahui Liang and Dr. Wang for the help in DTI reconstruction, Dr. Weidong Chen for the help in the analysis of scRNA-seq, and Dr. Cheng Yan for the help in fMOST analysis.
Funding
This study was supported by the National Science Foundation of China (81870933), the GuangDong Basic and Applied Basic Research Foundation (2021A1515012351), the Guangzhou Basic and Applied Basic Research Foundation (202102010127), and the Opening Lab Program of Guangzhou Medical University (0506308) to Y. Jiang; the National Science Foundation of China (82171282), the Scientific Program of Jiangsu Provincial Health Commission (M2020064), and the Suzhou Science and Technology Program (SYS2020101) to J. Zhu; and the Scientific Program of Guangzhou Municipal Health Commission (20191A011083) to Z. Qiu.
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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by Ming Luo, Zhihua Qiu, Xiangyue Tang, Li Wu, and Shaojun Li. The first draft of the manuscript was written by Yongjun Jiang and Juehua Zhu, and all authors commented on the previous version of the manuscript. All authors read and approved the final manuscript.
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Supplementary Information
Figure S1
Overview of the single cells from pontine infarction and normal pontine samples. (A) Summary of the sample origins. Red area was the infarct zone and the blue area was the PWI-DWI mismatch. The samples were taken from the peri-infarct zone and the corresponding area in the NC group. (B) tSNE of the cells profiled here with each cell color-coded for (left to right): the sample origin (red from NC and blue from PI), the corresponding rat, the associated cell type, and the number of transcripts (UMIs) detected in the cell (log scale as defined in the inset). (C) Expression of marker genes for the cell types defined above panel. (D) For the 15 cell subclusters: the fraction of cells originating from each rat (upper left), from PI and NC (upper right), the number of cells (down left) and the bot plots of the number of transcripts (down right). PI, pontine infarction; NC, normal control. (PNG 2692 kb)
Figure S2
RNA sequencing between pontine infarction and MCAO. (A) Six hours after MCAO or PI, the tissues from the peri-infarct zone (mismatch of red dot line and blue area) or the corresponding area in the control groups were extracted for RNA-seq. (B) The down and up-regulated genes in the MCAO and PI compared to the normal controls. (C) The 478 genes were significantly changed in the PI peri-infarct zone. Of them, there were 377 up-regulated genes. (D) Pathway analysis showed that cell cycle had the most up-regulated genes. (E) Volcano plot of genes in the cell cycle. (F) Results of real-time PCR of genes in the cell cycle. PI, pontine infarction. *P<0.05 considered as significant difference when compared to the control group. (PNG 911 kb)
Figure S3
CuE inhibited the SPP1+ microglia in vitro. (A) CuE decreased the SPP1+ microglia. The Iba-1, CD68 and CD206 positive microglia showed no significant difference between OGD and CuE groups. (B) summarizes the positive cells. NC, normal control; OGD, oxygen glucose deprivation. * compared with NC; # compared with OGD. The scale bar represents 25 μm. (PNG 1714 kb)
Figure S4
Luxol Fast Blue (LFB) staining. The blue box was ischemic core, the red box was peri-infarction zone and the black box was normal area. The rats without injection of ET-1 (0h) as the control. At 6h, 24h, 3d, 7d and 14d after stroke onset, the rats were sacrificed for brain sections (20μm) and LFB staining. MCAO, middle cerebral artery occlusion; PI, pontine infarction. Scale bar was 10μm. (PNG 3932 kb)
Supplementary file 1
(PNG 4321 kb)
3D structure of pontine vessels. (MP4 11793 kb)
Comparison of occluded and non-occluded pontine vessels. (MP4 14649 kb)
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Luo, M., Qiu, Z., Tang, X. et al. Inhibiting Cyclin B1-treated Pontine Infarction by Suppressing Proliferation of SPP1+ Microglia. Mol Neurobiol 60, 1782–1796 (2023). https://doi.org/10.1007/s12035-022-03183-w
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DOI: https://doi.org/10.1007/s12035-022-03183-w