Anti-Inflammatory Mechanisms in Macrophage Models

Macrophages serve as key regulators of the innate immune response, orchestrating both pro- and anti-inflammatory processes. Upon exposure to stimuli such as microbial components or cytokines, signalling cascades including nuclear factor-κB (NF-κB), mitogen-activated protein kinases (MAPKs) and signal transducer and activator of transcription (STAT) pathways become activated, driving the production of nitric oxide, prostaglandins and pro-inflammatory cytokines. A counter-regulatory network centred on the transcription factor Nrf2 induces expression of antioxidant and cytoprotective enzymes, notably heme oxygenase-1 (HO-1) and NAD(P)H quinone oxidoreductase 1 (NQO1), thereby mitigating excessive inflammation. Contemporary macrophage models exploit chemical inhibitors, natural extracts, engineered compounds and genetically modified cells to dissect these intersecting pathways. Advances in biotransformation and synthetic chemistry have expanded the repertoire of anti-inflammatory agents, offering novel mechanistic insights and therapeutic leads for inflammatory disorders.

Research from Nature Portfolio

Recent studies have illuminated how lignan derivatives can temper macrophage-driven inflammation through coordinated modulation of MAPK and NF-κB signalling. In LPS-stimulated RAW 264.7 cells, (+)-syringaresinol was shown to inhibit IKK-mediated IκBα degradation and attenuate phosphorylation of key MAPKs, leading to reduced expression of inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2) and pro-inflammatory cytokines such as TNF-α, IL-1β and IL-6. In vivo validation in a carrageenan-induced paw-edema model confirmed anti-edema effects and downregulation of inflammatory transcripts. This work underscores the therapeutic potential of dual-target inhibitors that intersect MAPK and NF-κB axes to achieve robust anti-inflammatory outcomes.

Anti-Inflammatory Mechanisms in Macrophage Models publication trend

The graph below shows the total number of articles in anti-inflammatory mechanisms in macrophage models across all publications each year (not limited to Nature Index journals).

Technical terms

Macrophage: Innate immune cell that engulfs pathogens and orchestrates inflammatory and reparative responses.

NF-κB: Transcription factor complex that induces pro-inflammatory genes upon activation by various stimuli.

MAPKs (Mitogen-Activated Protein Kinases): Family of kinases (ERK, JNK, p38) transmitting extracellular signals to regulate gene expression.

Nrf2 (Nuclear Factor Erythroid 2-Related Factor 2): Transcription factor that upregulates antioxidant and cytoprotective enzymes under oxidative or inflammatory stress.

iNOS (Inducible Nitric Oxide Synthase): Enzyme producing nitric oxide during inflammatory responses, contributing to microbial killing and tissue signalling.

COX-2 (Cyclooxygenase-2): Enzyme responsible for prostaglandin E₂ synthesis during inflammation, driving vasodilation and pain sensitisation.

References

1. Regulation of anti-inflammatory and antioxidant responses by methanol extract of Mikania cordata (Burm. f.) B. L. Rob. leaves via the inactivation of NF-κB and MAPK signaling pathways and activation of Nrf2 in LPS-induced RAW 264.7 macrophages. Biomedicine & Pharmacotherapy (2023).
2. Anti-Inflammatory Effects of Chamaecyparis obtusa (Siebold & Zucc.) Endl. Leaf Extract Fermented by Ganoderma applanatum Mycelia. Pharmaceutics (2024).
3. Synthesis and Biological Properties of Pyranocoumarin Derivatives as Potent Anti-Inflammatory Agents. International Journal of Molecular Sciences (2023).
4. Attenuation of inflammatory responses by (+)-syringaresinol via MAP-Kinase-mediated suppression of NF-κB signaling in vitro and in vivo. Scientific Reports (2018).