Cited by 581Immune Response and InflammationMicroRNA in disease regulationNeuroinflammation and Neurodegeneration Mechanisms

The DOI matches its Crossref record; 45 of the 46 references it cites were found in a registry or an index.

The Kinase Akt1 Controls Macrophage Response to Lipopolysaccharide by Regulating MicroRNAs

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Abstract

MicroRNAs regulated by lipopolysaccharide (LPS) target genes that contribute to the inflammatory phenotype. Here, we showed that the protein kinase Akt1, which is activated by LPS, positively regulated miRNAs let-7e and miR-181c but negatively regulated miR-155 and miR-125b. In silico analyses and transfection studies revealed that let-7e repressed Toll-like receptor 4 (TLR4), whereas miR-155 repressed SOCS1, two proteins critical for LPS-driven TLR signaling, which regulate endotoxin sensitivity and tolerance. As a result, Akt1(-/-) macrophages exhibited increased responsiveness to LPS in culture and Akt1(-/-) mice did not develop endotoxin tolerance in vivo. Overexpression of let-7e and suppression of miR-155 in Akt1(-/-) macrophages restored sensitivity and tolerance to LPS in culture and in animals. These results indicate that Akt1 regulates the response of macrophages to LPS by controlling miRNA expression.

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Crossref · 10.1016/j.immuni.2009.06.024

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Metadata

Authors
Androulidaki, A., Iliopoulos, D., Arranz, A., Doxaki, C., Schworer, S., Zacharioudaki, V., Margioris, A. N., Tsichlis, P. N., & Tsatsanis, C.
Affiliations
  • University of Crete (GR)
  • Harvard University (US)
  • Tufts Medical Center (US)
Corresponding author
Tsatsanis, Christos
Venue
Immunity
Publisher
Elsevier BV
Published
2009-08
Volume
31
Issue
2
Pages
220-231
ISSN
1074-7613 (ISSN-L)
OpenAlex
W2067647130
Cited by
581
References
46
Citations by year
2026: 14 · 2025: 13 · 2024: 17 · 2023: 22 · 2022: 28 · 2021: 26 · 2020: 27 · 2019: 25 · 2018: 42 · 2017: 42 · 2016: 50 · 2015: 47 · 2014: 45 · 2013: 54 · 2012: 53
FWCI
18.41
Type
journal article
Language
en
Open access
Locations
  • Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Cancer Institute (R01CA057436, N02 CO041101, 2-CO-41101)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
AKT1, macrophages, lipopolysaccharide, microRNA, let-7e, miR-155, miR-181c, miR-125b, TLR4, SOCS1, endotoxin tolerance, endotoxin sensitivity, LPS signaling, inflammation
MeSH terms
Suppressor of Cytokine Signaling 1 Protein, Animals, Cell Line, Immune Tolerance, Lipopolysaccharides, Macrophages, Mice, Inbred C57BL, Mice, Knockout, MicroRNAs, Suppressor of Cytokine Signaling Proteins, Proto-Oncogene Proteins c-akt, Toll-Like Receptor 4, Mice

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