Abstract
Neuroinflammation is involved in a wide range of brain disorders, thus there is great interest in identifying novel anti-inflammatory agents to include in therapeutic strategies. Our previous in vitro studies revealed that beta-funaltrexamine (β-FNA), a well-characterized selective mu-opioid receptor (MOR) antagonist, inhibits inflammatory signaling in human astroglial cells, albeit through an apparent MOR-independent mechanism. We also previously determined that lipopolysaccharide (LPS)-induced sickness behavior and neuroinflammation in mice are prevented by pretreatment with β-FNA. Herein we investigated the temporal importance of β-FNA treatment in this pre-clinical model of LPS-induced neuroinflammation. Adult, male C57BL/6J mice were administered an i.p. injection of LPS followed by treatment (i.p. injection) with β-FNA immediately or 4 h post-LPS. Sickness behavior was assessed using an open-field test, followed by assessment of inflammatory signaling in the brain, spleen, and plasma. Levels of inflammatory chemokines/cytokines (interferon γ-induced protein, CXCL10; monocyte chemotactic protein 1, CCL2; and interleukin-6, IL-6) in tissues were measured using an enzyme-linked immunosorbent assay and nuclear factor-kappa B (NFκB), p38 mitogen activated kinase (p38 MAPK), and glial fibrillary acidic protein (GFAP) expression were measured by western blot. LPS-induced sickness behavior and chemokine expression were inhibited more effectively when β-FNA treatment occurred immediately after LPS administration, as opposed to 4 h post-LPS; and β-FNA-mediated effects were time-dependent as evidenced by inhibition at 24 h, but not at 8 h. The inhibitory effects of β-FNA on chemokine expression were more evident in the brain versus the spleen or plasma. LPS-induced NFκB-p65 and p38 MAPK expression in the brain and spleen were inhibited at 8 and 24 h post-LPS. These findings extend our understanding of the anti-inflammatory effects of β-FNA and warrant further investigation into its therapeutic potential.
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Funding
This work was supported in part by Oklahoma Health Research Program (Oklahoma Center for the Advancement of Science and Technology, HR 18-033) (RLD), the Office of the Vice President of Research at Oklahoma State University Center for Health Sciences (RLD), and Graduate and Professional Student Association (GPSGA) Research Materials Awards (SM).
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SM: performed experiments and assays, analyzed data, prepared manuscript. KM: performed experiments and assays, interpreted data, edited manuscript. DB: performed experiments and assays, interpreted data, edited manuscript. JTC: conceptualization and design of study, assisted with statistical analyses, interpreted data. RLD: conceptualization and design of study, assisted with statistical analyses, interpreted data, troubleshooted assays, edited manuscript.
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Animal manipulations and handling processes for all experiments were approved by the OSU-CHS Institutional Animal Care and Use Committee, protocol # 2020-1236.
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Myers, S., McCracken, K., Buck, D.J. et al. Anti-inflammatory actions of β-funaltrexamine in a mouse model of lipopolysaccharide-induced inflammation. Inflammopharmacol 31, 349–358 (2023). https://doi.org/10.1007/s10787-022-01113-9
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DOI: https://doi.org/10.1007/s10787-022-01113-9