Anti-Inflammatory Effect of miR-197-3p-Loaded Microvesicles in Familial Mediterranean Fever Mouse Model
Yeliz Z Akkaya-Ulum1, Emre Nalbant1, Baris Ulum2
1Department of Medical Biology, Faculty of Medicine, Hacettepe University, Ankara, Türkiye.
Abstract:
Familial Mediterranean Fever (FMF) is an inherited autoinflammatory disease triggered by Mediterranean Fever (MEFV) gene mutations that lead to spontaneous pyrin inflammasome activation and exaggerated pro-inflammatory cytokine secretion. The V726A knock-in (KI) mouse model of FMF mimics most of the clinical and immunologic manifestations of the disease, such as recurrent febrile attacks and systemic inflammation. Here, we explored the proof-of-concept evaluation of miR-197-3p-loaded microvesicles (MVs) as a therapeutic approach in the FMF KI mouse model. MVs were purified and structurally characterized through Cryo-Transmission Electron Microscopy (Cryo-TEM), establishing their integrity and size (100-1000 nm), which are compatible for nucleic acid delivery. The miR-197-3p-loaded MVs were retro-orbitally injected in FMF KI mice, and the outcomes were investigated in terms of interleukin-1beta (IL-1β) secretion, CD11b expression in total blood, spleen weight (mg) and back length as a morphological feature. miR-197-3p-loaded MV treatment in MefvV726A/V726A mouse model of FMF decreased the IL-1β level and the expression of CD11b and improved clinical inflammation manifestations. The results show that miR-197-3p-loaded MVs modulate inflammation, as well as improve phenotypic features of FMF, which is a promising, cell-free potential therapeutic strategy for autoinflammatory diseases. This study represents a preliminary proof-of-concept evaluation of miR-197-3p-loaded microvesicles in a murine FMF model, and further long-term and large-scale studies are required before clinical translation can be considered.
Insights
Microvesicles loaded with miR-197-3p show promise in treating Familial Mediterranean Fever (FMF) by reducing inflammation and improving disease features in a mouse model.
Area of Science:
- Immunology
- Genetics
- Nanomedicine
Background:
- Familial Mediterranean Fever (FMF) is an inherited autoinflammatory disease caused by MEFV gene mutations.
- These mutations lead to excessive inflammation via pyrin inflammasome activation and cytokine release.
- The V726A knock-in (KI) mouse model accurately reflects FMF's clinical and immunological aspects.
Purpose of the Study:
- To evaluate miR-197-3p-loaded microvesicles (MVs) as a potential cell-free therapy for FMF.
- To assess the therapeutic efficacy in the FMF KI mouse model.
Main Methods:
- Microvesicles (MVs) were purified and characterized using Cryo-Transmission Electron Microscopy (Cryo-TEM).
- miR-197-3p-loaded MVs were administered to FMF KI mice via retro-orbital injection.
- Outcomes measured included IL-1β levels, CD11b expression, spleen weight, and morphological features.
Main Results:
- Treatment with miR-197-3p-loaded MVs significantly reduced IL-1β secretion and CD11b expression in FMF KI mice.
- Clinical manifestations of inflammation were improved following MV treatment.
- The MVs demonstrated appropriate size and integrity for nucleic acid delivery.
Conclusions:
- miR-197-3p-loaded MVs represent a promising, cell-free therapeutic strategy for modulating inflammation in FMF.
- This approach shows potential for treating autoinflammatory diseases.
- Further research is needed for clinical translation.
