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Cytoglobin Attenuates Neuroinflammation in Lipopolysaccharide-Activated Primary Preoptic Area Cells via NF-κB Pathway
Bruna R B Gomes1, Gabriela Luna S de Sousa2, Daniela Ott3
1Laboratory of Protein Chemistry and Biochemistry, Department of Cell Biology, Institute of Biology, University of Brasília, Brasília, Brazil.
Insights
Cytoglobin (Cygb) reduces neuroinflammation by inhibiting the NF-κB pathway in the brain. This protein may help control fever and protect against inflammatory responses.
Area of Science:
- Neuroscience
- Molecular Biology
- Immunology
Background:
- Cytoglobin (Cygb) is a protein involved in oxygen transport and has protective roles against oxidative stress and inflammation.
- Cygb is expressed in brain regions like the preoptic area (POA), crucial for thermoregulation.
- Neuroinflammation, triggered by factors like lipopolysaccharide (LPS), affects brain function and body temperature.
Purpose of the Study:
- To investigate the role of Cytoglobin (Cygb) in regulating neuroinflammation within the rat hypothalamus.
- To determine if Cygb affects the expression of inflammatory cytokines and signaling pathways in response to LPS stimulation.
Main Methods:
- Measuring Cygb upregulation in rat hypothalamus post-LPS administration.
- Treating primary POA cell cultures with Cygb and stimulating with LPS.
- Quantifying levels of tumor necrosis factor-alpha (TNF-α) and interleukin-6 (IL-6).
- Assessing the nuclear translocation of transcription factors including nuclear factor-κB (NF-κB).
Main Results:
- Cygb expression was upregulated in the rat hypothalamus after LPS administration.
- Cygb treatment reduced TNF-α and IL-6 concentrations in LPS-stimulated POA cultures.
- Cygb treatment decreased nuclear NF-κB immunoreactivity, suggesting pathway inhibition.
Conclusions:
- Cytoglobin (Cygb) attenuates LPS-induced secretion of IL-6 and TNF-α in POA cultures.
- The anti-inflammatory effect of Cygb is mediated through the inhibition of the NF-κB signaling pathway.
- Cygb may play a significant role in controlling neuroinflammation and fever regulation.
Abstract:
Cytoglobin (Cygb) is a hexacoordinate protein, associated with the transport of oxygen, nitric oxide scavenging, tumor suppression and protection against oxidative stress and inflammation. This protein is expressed in brain areas including the preoptic area (POA) of the anterior hypothalamus, the region responsible for the regulation of body temperature. In this study, we show that Cygb is upregulated in the rat hypothalamus 2.5 h and 5 h after intravenous administration of lipopolysaccharide (LPS). We investigated the effect of treatment with Cygb in POA primary cultures stimulated with LPS for 4 h. The levels of tumor necrosis factor-alpha (TNF-α) and interleukin-6 (IL-6) were measured and the results showed that Cygb reduced the concentrations of both cytokines. We further observed a decrease in immunoreactivity of the inflammatory transcription factor nuclear factor-κB (NF-κB), but not NF-IL6 and STAT3, in the nucleus of Cygb-treated POA cells. These findings suggest that Cygb attenuates the secretion of IL-6 and TNF-α in LPS-stimulated POA primary cultures via inhibition of the NF-κB signaling pathway, indicating that this protein might play an important role in the control of neuroinflammation and fever.
