Related Experiment Video
Updated: Jun 13, 2026
Intrastriatal Injection of Autologous Blood or Clostridial Collagenase as Murine Models of Intracerebral Hemorrhage
Published on: July 3, 2014
Inhibition of C3a/C3aR by SB290157 Attenuates Neuroinflammation via PKC/P38/NLRP3 Signaling Pathway After
Dongqing Qi1,2, Pengju Wei3, Yuhui Cui4
1Department of Intensive Care Unit, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China.
Insights
SB290157, a C3aR antagonist, reduces neuroinflammation and improves neurological function after intracerebral hemorrhage in mice. This occurs via the C3aR/PKC/P38/NLRP3 pathway, suggesting a potential therapeutic target for ICH.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- The C3a/C3aR axis is implicated in neurological diseases.
- Neuroinflammation plays a key role in intracerebral hemorrhage (ICH) pathogenesis.
Purpose of the Study:
- To investigate the effects of C3aR antagonist SB290157 on neuroinflammation in a mouse model of ICH.
- To elucidate the role of the PKC/P38/NLRP3 pathway in C3aR-mediated neuroinflammation.
Main Methods:
- An ICH mouse model was established by injecting autologous blood.
- SB290157 was administered intraperitoneally post-ICH.
- Mechanisms were explored using C3aR siRNA, C3a, and PMA.
- Techniques included Western blot, immunofluorescence, Nissl staining, and behavioral tests.
Main Results:
- SB290157 treatment reduced microglial activation, neutrophil infiltration, and brain edema post-ICH.
- SB290157 downregulated phosphorylated PKC, P38, NLRP3, TNF-α, IL-6, and IL-1β.
- C3aR inhibition improved neurological deficits in behavioral tests.
Conclusions:
- SB290157 inhibits neuroinflammation and improves neurological function after ICH in mice.
- The C3aR/PKC/P38/NLRP3 signaling pathway is a key mediator.
- Targeting C3aR to inhibit NLRP3-dependent neuroinflammation is a potential therapeutic strategy for ICH.
Background:
The C3a/C3aR axis has been shown to play an important role in a variety of neurological diseases. The aim of this study was to investigate the effects of the C3aR antagonist SB290157 on neuroinflammation in a mouse model of intracerebral hemorrhage (ICH) and the mechanism of the protein kinase C (PKC)/P38/NLRP3 signaling pathway in C3aR-mediated neuroinflammation.
Methods:
A total of 276 CD-1 mice were randomly assigned to different experimental groups. The ICH model was constructed by injecting autologous blood into the right basal ganglia, and SB290157 was administered intraperitoneally after 1 h. C3a (an endogenous ligand for C3aR), PMA (a specific PKC activator), and C3aR small interfering RNA (siRNA) were chosen to elucidate the underlying mechanisms. Western blots, immunofluorescence staining, Nissl staining, neurobehavioral tests, and brain water content tests were also performed.
Results:
C3aR was mainly expressed on microglia. The expression of C3a and C3aR was upregulated in the right hemisphere of the brain after ICH. Intraperitoneal injection of SB291057 improves short-term and long-term behavioral deficits, attenuates brain edema, and reduces the number of activated microglia and neutrophil infiltration after ICH and downregulates the expression of phosphorylated PKC, phosphorylated P38, and NLRP3, as well as tumor necrosis factor-α, interleukin-6 (IL-6), and IL-1β. Administration of C3aR siRNA and the C3aR endogenous agonist C3a reversed the protective effect of SB290157. In addition, selective activation of PKC/P38/NLRP3 signaling also attenuated the antiinflammatory effects of SB290157 after ICH.
Conclusions:
This study demonstrates that SB290157 inhibits neuroinflammation and improves short-term and long-term neurological function after ICH in mice, at least in part through regulation of the C3aR/PKC/P38/NLRP3 signaling pathway. Targeting C3aR to inhibit NLRP3-dependent neuroinflammation may provide a promising therapeutic approach for treating ICH.
