Cited by 322Immune cells in cancerMicroRNA in disease regulationMacrophage Migration Inhibitory Factor

MicroRNA let-7c Regulates Macrophage Polarization

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Banerjee, Sami, Xie, Na, Cui, Huachun, Tan, Zheng, Yang, Shanzhong, Icyuz, Mert, Abraham, Edward, Liu, Gang·2013·The Journal of Immunology

Abstract

Macrophages demonstrate a high level of plasticity, with the ability to undergo dynamic transition between M1 and M2 polarized phenotypes. The role of microRNAs (miRNAs) in regulating macrophage polarization has been largely undefined. In this study, we found that miRNA let-7c is expressed at a higher level in M-BMM (M2 macrophages) than in GM-BMM (M1 macrophages). let-7c levels are also greater in alveolar macrophages from fibrotic lungs as compared with those from normal lungs. let-7c expression was decreased when M-BMM converted to GM-BMM, whereas it increased when GM-BMM converted to M-BMM. LPS stimulation reduced let-7c expression in M-BMM. We found that overexpression of let-7c in GM-BMM diminished M1 phenotype expression while promoting polarization to the M2 phenotype. In contrast, knockdown of let-7c in M-BMM promoted M1 polarization and diminished M2 phenotype expression. We found that let-7c targets C/EBP-δ, a transcriptional factor that plays an important role in inflammatory response. Furthermore, we found that let-7c regulates bactericidal and phagocytic activities of macrophages, two functional phenotypes implicated in macrophage polarization. Our data suggest that the miRNA let-7c plays an important role in regulating macrophage polarization.

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  • let-7c expression is suppressed by LPS, whereas its upregulation results in a change from the M1 to M2 phenotype by targeting the C/EBP-δ transcription factor.

    “Expression of let-7c is suppressed by LPS, whereas its upregulation results in a change from the M1 to M2 phenotype by targeting the C/EBP-δ transcription factor [110].”

    From MicroRNAs as Regulators of Phagocytosis (2022) · cites this paper as [110]

  • Overexpression of let-7c promotes the M2 phenotype and increases phagocytosis of apoptotic cells, whereas knockdown decreases it.

    “Overexpression of let-7c, by promoting the M2 phenotype, increases phagocytosis of apoptotic cells, whereas its knockdown decreases it [110].”

    From MicroRNAs as Regulators of Phagocytosis (2022) · cites this paper as [110]

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  1. [21]Yang S Xie N Cui H Banerjee S Abraham E Thannickal VJ Liu G miR-31 is a negative regulator of fibrogenesis and pulmonary fibrosis Faseb J 2012 PMC3425828 22661007

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Authors
Banerjee, S., Xie, N., Cui, H., Tan, Z., Yang, S., Icyuz, M., Abraham, E., & Liu, G.
Affiliations
  • University of Alabama at Birmingham (US)
  • Wake Forest University Health Sciences (US)
Corresponding author
  • Banerjee, Sami
  • Xie, Na
  • Cui, Huachun
  • Tan, Zheng
  • Yang, Shanzhong
  • Icyuz, Mert
  • Liu, Gang
Venue
The Journal of Immunology
Published
2013-06
Volume
190
Issue
12
Pages
6542-6549
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1927296860
Cited by
320
References
62
Citations by year
2026: 5 · 2025: 18 · 2024: 24 · 2023: 20 · 2022: 28 · 2021: 33 · 2020: 26 · 2019: 26 · 2018: 31 · 2017: 22 · 2016: 21 · 2015: 29 · 2014: 17 · 2013: 7 · 2012: 1
FWCI
13.65
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL 076206, R21HL097218, HL-105473, R01HL105473, R01HL076206, HL-097218)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (P30AR048311)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Macrophage Migration Inhibitory Factor
Keywords
let-7c microRNA, macrophage polarization, M1/M2 macrophages, C/EBPδ, alveolar macrophages, pulmonary fibrosis, lipopolysaccharide, phagocytosis, bactericidal activity, bone marrow-derived macrophages
MeSH terms
Animals, Cell Differentiation, Flow Cytometry, Macrophages, Mice, Inbred BALB C, Mice, Inbred C57BL, Phenotype, Transfection, Blotting, Western, Cell Polarity, Reverse Transcriptase Polymerase Chain Reaction, MicroRNAs, Mice, Real-Time Polymerase Chain Reaction

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