Cited by 260MicroRNA in disease regulationImmune cells in cancerImmune Response and Inflammation

miR-125a-5p Regulates Differential Activation of Macrophages and Inflammation

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Banerjee, Sami, Cui, Huachun, Xie, Na, Tan, Zheng, Yang, Shanzhong, Icyuz, Mert, Thannickal, Victor John, Abraham, Edward +1 more·2013·Journal of Biological Chemistry

Abstract

Macrophage activation is a central event in immune responses. Macrophages undergoing classical activation (M1 macrophages) are proinflammatory, whereas alternatively activated macrophages (M2 macrophages) are generally anti-inflammatory. miRNAs play important regulatory roles in inflammatory response. However, the manner in which miRNAs regulate macrophage activation in response to different environmental cues has not been well defined. In this study, we found that M-BMM macrophages (M2) express greater levels of miR-125a-5p than do GM-BMM macrophages (M1). Stimulation of macrophages through TLR2 and TLR4 but not through TLR3 enhanced miR-125a-5p expression. Up-regulation of miR-125a-5p after TLR2/4 activation requires the adaptor MYD88 but not TRIF. Overexpression of miR-125a-5p diminished M1 phenotype expression induced by LPS but promoted M2 marker expression induced by IL-4. In contrast, knockdown of miR-125a-5p promoted M1 polarization and diminished IL-4-induced M2 marker expression. We found that miR-125a-5p targets KLF13, a transcriptional factor that has an important role in T lymphocyte activation and inflammation. KLF13 knockdown had similar effects on M1 activation as did miR-125a-5p overexpression. In addition, miR-125a-5p regulates phagocytic and bactericidal activities of macrophages. Our data suggest that miR-125a-5p has an important role in suppressing classical activation of macrophages while promoting alternative activation.

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  • M1 macrophages transfected with miR-125a-5p are less potent in exerting bactericidal activity against Escherichia coli, which results from targeting Kruppel-like Factor 13 (KLF13) and promotion of M2 polarization.

    “M1 macrophages, when transfected with miR-125a-5p, are less potent in exerting bactericidal activity against Escherichia coli, which results from targeting Kruppel-like Factor 13 (KLF13) and promotion of M2 polarization [138].”

    From MicroRNAs as Regulators of Phagocytosis (2022) · cites this paper as [138]

    In ‘miR-125a-5p Regulates Macrophage Activation’ (page not supplied), the paper reports that miR-125a-5p-transfected GM-BMM had diminished bactericidal activity against E. coli and that miR-125a-5p promotes M2 markers. It identifies KLF13 as a target but says the functional effects are ‘likely’ mediated by KLF13 and may not be solely mediated by it. The paper does not establish that promotion of M2 polarization causes the reduction in bacterial killing. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • TLR2/TLR4 stimulation upregulates miR-125a-5p in a MYD88-dependent manner, promoting the M2 phenotype.

    “Stimulation of TLR2 and TLR4 leads to upregulation of miR-125a-5p in an MYD88-dependent manner and subsequently promotes the M2 phenotype [138]”

    From MicroRNAs as Regulators of Phagocytosis (2022) · cites this paper as [138]

    The Results and Discussion report that TLR2/TLR4 stimulation upregulates miR-125a-5p and that this induction requires MYD88. The paper also finds that miR-125a-5p enhances M2 marker expression, but that result was measured after IL-4 exposure; it does not show that TLR2/TLR4 stimulation itself subsequently promotes the M2 phenotype. The Results instead describe LPS stimulation as inducing M1 activation. (LLM, conf=0.86)

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Authors
Banerjee, S., Cui, H., Xie, N., Tan, Z., Yang, S., Icyuz, M., Thannickal, V. J., Abraham, E., & Liu, G.
Affiliations
  • University of Alabama at Birmingham (US)
  • Wake Forest University Health Sciences (US)
Corresponding author
Liu, Gang
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2013-12
Volume
288
Issue
49
Pages
35428-35436
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1989029018
Cited by
258
References
52
Citations by year
2026: 10 · 2025: 12 · 2024: 19 · 2023: 25 · 2022: 29 · 2021: 33 · 2020: 17 · 2019: 25 · 2018: 24 · 2017: 19 · 2016: 21 · 2015: 14 · 2014: 9
FWCI
5.16
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL 076206, HL114470, HL-105473, R01HL105473, R01HL076206, P01HL114470)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (P30AR048311)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
miR-125a-5p, macrophage polarization, M1 macrophages, M2 macrophages, classical activation, alternative activation, KLF13, TLR2, TLR4, MyD88, TRIF, LPS, IL-4, inflammation, phagocytosis, bactericidal activity, bone marrow-derived macrophages
MeSH terms
Animals, Escherichia coli, Inflammation, Macrophage Activation, Macrophages, Mice, Inbred C57BL, Repressor Proteins, Up-Regulation, Mice, Knockout, Cell Cycle Proteins, Adaptor Proteins, Vesicular Transport, MicroRNAs, Toll-Like Receptor 2, Toll-Like Receptor 4, Mice, Kruppel-Like Transcription Factors, Myeloid Differentiation Factor 88, Gene Knockdown Techniques

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