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Coadministration of Monophosphoryl Lipid and Curcumin Modulates Neuroprotective Effects in LPS Stimulated Rat Primary
Maryam Hooshmand1, Ahmad Asoodeh1
1Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran.
Abstract:
Lipopolysaccharide (LPS)-induced activation of microglia triggers the release of neuroinflammatory molecules, contributing to the progression of neurodegenerative diseases. Targeting these neuroinflammatory molecules could serve as a potential therapeutic strategy. Given the evidence supporting the immune-boosting properties of curcumin (Curc) and the protective effects of monophosphoryl lipid A (MPL) in the central nervous system (CNS) related to Alzheimer's disease (AD), this study aimed to assess the anti-inflammatory effects of these compounds on primary rat microglial cells, which are crucial in the response to neuroinflammation. This in vitro study investigated the effects of Curc, MPL, and their coadministration (Curc + MPL) on inflammatory cytokine levels in activated microglial cells. Primary microglial cells were isolated from 1-day-old rats and treated with various concentrations of Curc, MPL, and Curc + MPL prior to LPS stimulation. Cell viability was assessed using the MTT assay, followed by the Griess assay to evaluate nitric oxide (NO) production. The levels of inflammatory cytokines interleukin-1β (IL-1β), tumor necrosis factor-alpha (TNF-α), and interleukin-6 (IL-6), as well as the gene expression of inducible NO synthase (iNOS) and cyclooxygenase-2 (COX-2), were analyzed via real-time PCR. Additionally, enzyme-linked immunosorbent assay (ELISA) was employed to quantify the protein levels of IL-1β, TNF-α, and IL-6. Our findings demonstrate that Curc and MPL possess antineuroinflammatory properties in LPS-stimulated microglial cells. Notably, the coadministration of Curc and MPL (Curc + MPL) significantly inhibited the production of pro-inflammatory cytokines IL-1β, TNF-α, and IL-6. Furthermore, Curc + MPL suppressed the expression of iNOS and COX-2. These results strongly suggest that Curc + MPL is a promising neuroprotective agent for the treatment of neurodegenerative disorders by mitigating neuroinflammatory responses.
Insights
Curcumin (Curc) and monophosphoryl lipid A (MPL) show anti-neuroinflammatory effects in microglial cells. Their combination (Curc + MPL) significantly reduced key inflammatory markers, suggesting potential for treating neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglial activation by lipopolysaccharide (LPS) releases neuroinflammatory molecules, driving neurodegenerative disease progression.
- Curcumin (Curc) has immune-boosting properties, and monophosphoryl lipid A (MPL) offers neuroprotection, particularly in Alzheimer's disease (AD).
Purpose of the Study:
- To evaluate the anti-inflammatory effects of Curc, MPL, and their combination (Curc + MPL) on primary rat microglial cells.
- To investigate the impact of these compounds on neuroinflammatory responses triggered by LPS stimulation.
Main Methods:
- Primary rat microglial cells were treated with Curc, MPL, or Curc + MPL before LPS stimulation.
- Assays included MTT for cell viability, Griess for nitric oxide (NO) production, real-time PCR for gene expression (iNOS, COX-2), and ELISA for cytokine levels (IL-1β, TNF-α, IL-6).
Main Results:
- Curc and MPL demonstrated antineuroinflammatory properties in LPS-stimulated microglial cells.
- Curc + MPL significantly inhibited the production of pro-inflammatory cytokines IL-1β, TNF-α, and IL-6.
- Curc + MPL also suppressed the gene expression of inducible NO synthase (iNOS) and cyclooxygenase-2 (COX-2).
Conclusions:
- Curcumin and monophosphoryl lipid A exhibit significant antineuroinflammatory effects.
- The combination of Curc + MPL shows potent neuroprotective capabilities by mitigating neuroinflammation.
- Curc + MPL represents a promising therapeutic strategy for neurodegenerative disorders.
