Abstract
Background
The inflammatory response caused by microglia in the central nervous system plays an important role in Alzheimer's disease. Neuregulin-1 (NRG1) is a member of the neuregulin family and has been demonstrated to have anti-inflammatory properties. The relationship between NRG1, microglia phenotype and neuroinflammation remains unclear.
Materials and methods
BV2 cells were used to examine the mechanism of NRG1 in regulating microglia polarization. Neuronal apoptosis, inflammatory factors TNF-α and iNOS, microglia polarization, ErbB4 and NF-κB p65 expression were assessed.
Results
We found that exogenous NRG1 treatment or overexpression improved microglial activity and reduced the secretion of the inflammatory factors TNF-α and iNOS in vitro. The expression of Bax in SH-SY5Y neuron cells incubated with medium collected from the NRG1 treatment group decreased. Additionally, our study showed that NRG1 treatment reduced the levels of the M1 microglia markers CD120 and iNOS and increased the levels of the M2 microglia markers CD206 and Arg-1. Furthermore, we observed that NRG1 treatment attenuated Aβ-induced NF-κB activation and promoted the expression of p-ErbB4 and that knockdown of ErbB4 abrogated the effects of NRG1 on NF-κB, Bax levels and M2 microglial polarization.
Conclusion
NRG1 inhibits the release of inflammatory factors in microglia and regulates the switching of the M1/M2 microglia phenotype, most likely via ErbB4-dependent inhibition of the NF-κB pathway.
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Data availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
Abbreviations
- AD:
-
Alzheimer’s disease
- CON:
-
Control
- ELISA:
-
Enzyme-linked immunosorbent assay
- GFP:
-
Green fluorescent protein
- IL:
-
Interleukin
- iNOS:
-
Inducible nitric oxide synthase
- NC:
-
Negative control
- NF-κB:
-
Nuclear factor-kappa B
- NRG1:
-
Neuregulin-1
- OVER-N:
-
Overexpression-NRG1
- TNF:
-
Tumor necrosis factor
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Funding
This study was supported by funding support from the National Natural Science Foundation of China (U1804185, 81873459, U1804166), and the support project for the Disciplinary Group of Psychology and Neuroscience, Xinxiang Medical University (2016PN-KFKT-11).
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WC conceived and designed the experiments. YM, PF, RZ, YZ performed the research and analyzed the data. YM and WC wrote the paper. XW gave the informative advice. All authors read and approved the final manuscript.
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All of the procedures and animal care were approved by Xinxiang Medical University Ethics Committee (Xinxiang, China, Permit Number: XYLL-2018-B009) and were conducted in accordance with the National Institutes of Health guidelines for the care of laboratory animals.
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Ma, Y., Fan, P., Zhao, R. et al. Neuregulin-1 regulates the conversion of M1/M2 microglia phenotype via ErbB4-dependent inhibition of the NF-κB pathway. Mol Biol Rep 49, 3975–3986 (2022). https://doi.org/10.1007/s11033-022-07249-9
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DOI: https://doi.org/10.1007/s11033-022-07249-9