Rh‐CSF1 attenuates neuroinflammation via the CSF1R/PLCG2/PKCε pathway in a rat model of neonatal HIE
Open accessAbstract
Background: Hypoxic-ischemic encephalopathy (HIE) is a life-threatening cerebrovascular disease. Neuroinflammation plays an important role in the pathogenesis of HIE, in which microglia are key cellular mediators in the regulation of neuroinflammatory processes. Colony-stimulating factor 1 (CSF1), a specific endogenous ligand of CSF1 receptor (CSF1R), is crucial in microglial growth, differentiation, and proliferation. Recent studies showed that the activation of CSF1R with CSF1 exerted anti-inflammatory effects in a variety of nervous system diseases. This study aimed to investigate the anti-inflammatory effects of recombinant human CSF1 (rh-CSF1) and the underlying mechanisms in a rat model of HIE. Methods: A total of 202 10-day old Sprague Dawley rat pups were used. HI was induced by the right common carotid artery ligation with subsequent exposure of 2.5-h hypoxia. At 1 h and 24 h after HI induction, exogenous rh-CSF1 was administered intranasally. To explore the underlying mechanism, CSF1R inhibitor, BLZ945, and phospholipase C-gamma 2 (PLCG2) inhibitor, U73122, were injected intraperitoneally at 1 h before HI induction, respectively. Brain infarct area, brain water content, neurobehavioral tests, western blot, and immunofluorescence staining were performed. Results: The expressions of endogenous CSF1, CSF1R, PLCG2, protein kinase C epsilon type (PKCε), and cAMP response element-binding protein (CREB) were gradually increased after HIE. Rh-CSF1 significantly improved the neurological deficits at 48 h and 4 weeks after HI, which was accompanied by a reduction in the brain infarct area, brain edema, brain atrophy, and neuroinflammation. Moreover, activation of CSF1R by rh-CSF1 significantly increased the expressions of p-PLCG2, p-PKCε, and p-CREB, but inhibited the activation of neutrophil infiltration, and downregulated the expressions of IL-1β and TNF-α. Inhibition of CSF1R and PLCG2 abolished these neuroprotective effects of rh-CSF1 after HI. Conclusions: Our findings demonstrated that the activation of CSF1R by rh-CSF1 attenuated neuroinflammation and improved neurological deficits after HI. The anti-inflammatory effects of rh-CSF1 partially acted through activating the CSF1R/PLCG2/PKCε/CREB signaling pathway after HI. These results suggest that rh-CSF1 may serve as a potential therapeutic approach to ameliorate injury in HIE patients.
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PLCG2 plays a critical role in transducing signals emanating from a number of immune receptors, acting as an intracellular hub for immune signaling.
“PLCG2 plays a critical role in transducing signals emanating from a number of immune receptors, acting as an intracellular hub for immune signaling.”
From PLCG2 modulates TREM2 expression and signaling in response to Alzheimer's disease pathology (2025) · cites this paper as [17]
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- Authors
- Hu, X., Li, S., Doycheva, D. M., Huang, L., Lenahan, C., Liu, R., Huang, J., Xie, S., Tang, J., Zuo, G., & Zhang, J. H.
- Affiliations
- Loma Linda University (US)
- Central South University (CN)
- Corresponding author
- Zuo, Gang
- Zhang, John H.
- ORCID
- Venue
- Journal of Neuroinflammation
- Published
- 2020-06-10
- Volume
- 17
- Issue
- 1
- Pages
- 182-182
- ISSN
- 1742-2094 (ISSN-L)
- PMC
- PMC7285566
- OpenAlex
- W3033947439
- Cited by
- 35
- References
- 81
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 6 · 2023: 3 · 2022: 7 · 2021: 6 · 2020: 1 · 2019: 1 · 2018: 1
- FWCI
- 4.32
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Journal of Neuroinflammation (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Institute of Neurological Disorders and Stroke (NS104083)
- National Natural Science Foundation of China (81601051)
- Topics
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Neonatal and fetal brain pathology
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
- Keywords
- hypoxic-ischemic encephalopathy, neuroinflammation, CSF1R, PLCγ2, protein kinase C epsilon, CREB, microglia, neuroprotection, neonatal brain injury, intranasal drug delivery, neutrophil infiltration, IL-1β, TNF-α, BLZ945
- MeSH terms
- Animals, Animals, Newborn, Humans, Inflammation, Recombinant Proteins, Signal Transduction, Macrophage Colony-Stimulating Factor, Receptors, Granulocyte-Macrophage Colony-Stimulating Factor, Rats, Sprague-Dawley, Neuroprotective Agents, Hypoxia-Ischemia, Brain, Rats, Protein Kinase C-epsilon, Phospholipase C gamma
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