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Isolation and Culture of Bone Marrow-Derived Macrophages from Mice
Published on: June 23, 2023
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Autophagic reprogramming of bone marrow-derived macrophages
Mayada Mazher1,2, Yomna Adel Moqidem1, Mona Zidan2
1Biotechnology Program, School of Sciences and Engineering, The American University in Cairo, 11835, Cairo, Egypt.
Immunologic Research
|November 30, 2022
Summary
This study reveals how macro-autophagy influences macrophage polarization. Autophagy reprogramming of macrophages via specific genes like CD68 and arginase 1 offers potential for autoimmune disorder immunotherapy.
Area of Science:
- Cell Biology
- Immunology
- Molecular Biology
Background:
- Macro-autophagy is a fundamental catabolic process in eukaryotes, crucial for macrophage function.
- Macrophage polarization into distinct phenotypes (M1 and M2) dictates their immune response.
- The interplay between autophagy and macrophage polarization remains incompletely understood.
Purpose of the Study:
- To investigate the genetic regulatory network governing the interaction between autophagy and macrophage polarization.
- To identify key autophagy-related genes (Atgs) and differentially expressed genes (DEGs) involved in M1-M2 polarization.
- To explore the potential of targeting this network for therapeutic applications in autoimmune diseases.
Main Methods:
- Differentiated naive mouse bone marrow-derived monocytes into M0, M1, and M2a macrophage phenotypes.
- Utilized flow cytometry for immunophenotyping and confocal microscopy to assess autophagy.
- Validated key gene targets including Smad1, LC3A/B, Atg16L1, Atg7, IL-6, CD68, Arg-1, and Vamp7 in vitro.
Main Results:
- Identified distinct macrophage phenotypes: M0 (IL-6+/CD68+), M1 (IL-6+/CD68+/Arg-1+), and M2a (CD68+/Arg-1+).
- Observed increased autophagy in both M1 and M2a macrophages, with enhanced pre-autophagosome size and number.
- Demonstrated that Bafilomycin A treatment upregulated CD68 and Arg-1 expression across all macrophage lineages.
Conclusions:
- Successfully predicted protein targets mediating the autophagy-macrophage polarization interplay.
- Autophagy appears to reprogram macrophage polarization through specific pathways involving CD68, arginase 1, and Atg16L1 variants.
- These findings provide a basis for developing macrophage-based immunotherapies for autoimmune disorders.
