Cited by 95Immune Response and InflammationSepsis Diagnosis and TreatmentInflammation biomarkers and pathways

Fasciola hepatica Fatty Acid Binding Protein Inhibits TLR4 Activation and Suppresses the Inflammatory Cytokines Induced by Lipopolysaccharide In Vitro and In Vivo

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Martin, Ivelisse, Cabán-Hernández, Kimberly, Figueroa-Santiago, Olgary, Espino, Ana M·2015·The Journal of Immunology

Abstract

TLR4, the innate immunity receptor for bacterial endotoxins, plays a pivotal role in the induction of inflammatory responses. There is a need to develop molecules that block either activation through TLR4 or the downstream signaling pathways to inhibit the storm of inflammation typically elicited by bacterial LPS, which is a major cause of the high mortality associated with bacterial sepsis. We report in this article that a single i.p. injection of 15 μg fatty acid binding protein from Fasciola hepatica (Fh12) 1 h before exposure to LPS suppressed significantly the expression of serum inflammatory cytokines in a model of septic shock using C57BL/6 mice. Because macrophages are a good source of IL-12p70 and TNF-α, and are critical in driving adaptive immunity, we investigated the effect of Fh12 on the function of mouse bone marrow–derived macrophages (bmMΦs). Although Fh12 alone did not induce cytokine expression, it significantly suppressed the expression of IL-12, TNF-α, IL-6, and IL-1β cytokines, as well as inducible NO synthase–2 in bmMΦs, and also impaired the phagocytic capacity of bmMΦs. Fh12 had a limited effect on the expression of inflammatory cytokines induced in response to other TLR ligands. One mechanism used by Fh12 to exert its anti-inflammatory effect is binding to the CD14 coreceptor. Moreover, it suppresses phosphorylation of ERK, p38, and JNK. The potent anti-inflammatory properties of Fh12 demonstrated in this study open doors to further studies directed at exploring the potential of this molecule as a new class of drug against septic shock or other inflammatory diseases.

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Crossref · 10.4049/jimmunol.1401182

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  • Fh12 and Fh15 suppress responses of CD14-deficient cells.

    “The Fh12 and Fh15 proteins also suppress responses of CD14-deficient cells”

    From Modulation of Host Immunity by Helminths: The Expanding Repertoire of Parasite Effector Molecules (2018) · cites this paper as Martin et al., 2015

    The Results section on CD14-knockout macrophages (page unavailable) reports that Fh12 suppressed IL1β expression in response to HKLM, supporting one limited instance of the claim. It did not suppress the measured responses to LPS or IL12p35 in response to HKLM. The cited passages provide no finding for Fh15, so the claim overgeneralizes the Fh12 result and does not establish the Fh15 result. (LLM, conf=0.88)

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  • Fh12 and Fh15 bind to the TLR4 cofactor CD14 and reduce its expression, mediating suppression of TLR4 responses.

    “They bind to the TLR4 cofactor CD14 and reduce its expression, mediating suppression of TLR4 responses.”

    From Modulation of Host Immunity by Helminths: The Expanding Repertoire of Parasite Effector Molecules (2018) · cites this paper as Martin et al., 2015

    The Results sections on CD14 interaction and TLR4 pathway components report that Fh12 binds CD14 and reduces its expression. The Discussion proposes CD14 as a likely route for blocking LPS–TLR4 responses, rather than establishing it as the sole mechanism. The passages address Fh12, not Fh15, so they do not support extending the claim to both proteins. (LLM, conf=0.90)

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Authors
Martin, I., Cabán-Hernández, K., Figueroa-Santiago, O., & Espino, A. M.
Affiliations
University of Puerto Rico, Medical Sciences Campus (PR)
Corresponding author
Espino, Ana M
Venue
The Journal of Immunology
Published
2015-04
Volume
194
Issue
8
Pages
3924-3936
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W2121445620
Cited by
95
References
86
Citations by year
2026: 6 · 2025: 8 · 2024: 5 · 2023: 5 · 2022: 8 · 2021: 9 · 2020: 13 · 2019: 11 · 2018: 5 · 2017: 15 · 2016: 7 · 2015: 3
FWCI
4.92
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 Institute of General Medical Sciences (P20GM103642, R25GM061838)
  • National Institute of Allergy and Infectious Diseases (SC1AI096108)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Epidemiology › Sepsis Diagnosis and Treatment
  • Life Sciences › Immunology and Microbiology › Immunology › Inflammation biomarkers and pathways
Keywords
Fasciola hepatica, fatty acid binding protein, TLR4, lipopolysaccharide, septic shock, anti-inflammatory activity, macrophages, inflammatory cytokines, ERK1/2 phosphorylation, MAPK signaling, phagocytosis, innate immunity
MeSH terms
Animals, Bone Marrow Cells, Fasciola hepatica, Female, Inflammation, Lipopolysaccharides, Macrophages, Phosphorylation, Shock, Septic, Helminth Proteins, Cytokines, Mice, Knockout, Lipopolysaccharide Receptors, Extracellular Signal-Regulated MAP Kinases, Fatty Acid-Binding Proteins, Toll-Like Receptor 4, Mice, Nitric Oxide Synthase Type II

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