Abstract
Mucosa-associated lymphoid tissue lymphoma translocation protein 1 (MALT1) is involved in neural injury, neuroinflammation, microglia activation, and polarization, while its function in spinal cord injury (SCI) remains unclear. Thus, this study aimed to evaluate the role of MALT1 modification on SCI recovery and its underlying mechanism. SCI surgery or sham surgery was performed in Sprague–Dawley rats. Then, MALT1 knockdown or negative control lentivirus was injected into SCI rats. Subsequently, MALT1 expression, locomotor capability, neural injury, markers for microglia activation and polarization, inflammatory cytokine expressions, and nuclear factor (NF)-κB pathway were detected. SCI rats exhibited higher MALT1 expression, microglia activation and M1 polarization, neuroinflammation, and NF-κB pathway activation, while worse locomotor capacity compared to sham rats (all P < 0.05). In SCI rats, MALT1 knockdown alleviated Basso, Beattie, and Bresnahan score from 10 to 28 days and attenuated HE staining reflected neural injury (all P < 0.05). Besides, MALT1 knockdown declined the number of IBA1+ cells, IBA1+ iNOS+ cells, and IBA1+ CD86+ cells, while enhanced the number of IBA1+ Arg1+ cells and IBA1+ CD206+ cells in SCI rats (all P < 0.05). Meanwhile, MALT1 knockdown declined the expressions of IL-1β, IL-6, and TNF-α in SCI (all P < 0.05), but did not affect IL-10 expression (P > 0.05). Furthermore, MALT1 knockdown suppressed NF-κB pathway activation validated by immunofluorescence staining and western blot assays (all P < 0.05). MALT1 knockdown improves functional recovery, attenuates microglia activation, M1 polarization, and neuroinflammation via inhibiting NF-κB pathway in SCI.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was supported by the 2021 Nanshan District Health Technology Plan Project (NS094).
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SG and QPZ substantially contributed to the conception and the design of the study. SZ and HC were responsible for the acquisition of the data. GC and CC were responsible for the analysis of the data. JZ and WW contributed to the interpretation of the data. QHZ contributed to manuscript drafting and edited English language. All authors have read and approved the final manuscript.
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The protocols of this study were approved by Animal Care and Use Committee, and the experiments were carried out by following the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health.
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Supplementary Figure 1.
Co-localization of MALT1 and IBA1 in SCI rats. The presentation (A) and further comparison (B) of MALT1+ cells in different groups. The presentation of MALT1+ IBA1+ cells (C), co-localization analysis between MALT1 and IBA1 from the Pearson coefficient (D), and the comparison of IBA1+ cells MATL1 fluorescence intensity (E) in different groups. *** represented P<0.001, ** represented P<0.01, * represented P<0.05, NS: non-significant. (PNG 1714 kb)
Supplementary Figure 2.
Detection of upstream molecules of MALT1 in SCI rats. The presentation (A) and further comparison (B) of IBA1+ cells CARD9 fluorescent intensity in different groups. The presentation (C) and further comparison (D) of IBA1+ cells BCL10 fluorescent intensity in different groups. NS: non-significant. (PNG 1322 kb)
Supplementary Figure 3.
Effect of MI-2 and Rottlerin on locomotor capability and neural injury in SCI. Comparison of BBB score among different groups (A). Presentation of neural injury in different groups using HE staining (B). In (A): *** represented P<0.001 between SCI group and sham group, # represented P<0.05 between SCI group and SCI+MI-2 group, $ represented P<0.05 between SCI group and SCI+ Rottlerin group. (PNG 1099 kb)
Supplementary Figure 4.
Effect of MI-2 and Rottlerin on microglia M1 polarization in SCI. The presentation (A) and further comparison (B) of IBA1+ iNOS+ cells in different groups. The presentation (C) and further comparison (D) of IBA1+ CD86+ cells in different groups. *** represented P<0.001, ** represented P<0.01, * represented P<0.05, NS: non-significant. (PNG 987 kb)
Supplementary Figure 5.
Effect of MI-2 and Rottlerin on microglia M2 polarization in SCI. The presentation (A) and further comparison (B) of IBA1+ Arg1+ cells in different groups. The presentation (C) and further comparison (D) of IBA1+ CD206+ cells in different groups. ** represented P<0.01, * represented P<0.05, NS: non-significant. (PNG 892 kb)
Supplementary Figure 6.
Effect of MI-2 and Rottlerin on inflammatory cytokine expressions in SCI. Comparison of the levels of IL-1β (A), IL-6 (B), TNF-α (C) and IL-10 (D) in different groups. *** represented P<0.001, ** represented P<0.01, * represented P<0.05, NS: non-significant. (PNG 1234 kb)
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Zhang, Q., Zhang, S., Chen, H. et al. Targeting of MALT1 May Improve Functional Recovery and Attenuate Microglia M1 Polarization-Mediated Neuroinflammation During Spinal Cord Injury. Mol Neurobiol 60, 2632–2643 (2023). https://doi.org/10.1007/s12035-023-03208-y
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DOI: https://doi.org/10.1007/s12035-023-03208-y