Cited by 290Immune Response and InflammationNF-κB Signaling PathwaysSepsis Diagnosis and Treatment

A Novel Receptor Tyrosine Kinase, Mer, Inhibits TNF-α Production and Lipopolysaccharide-Induced Endotoxic Shock

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Camenisch, Todd D, Koller, Beverly H, Earp, H Shelton, Matsushima, Glenn K·1999·The Journal of Immunology

Abstract

Abstract The regulation of monocyte function and the inhibition of TNF-α production during bacterial sepsis are critical in attenuating adverse host responses to endotoxemia. To study the function of a novel receptor tyrosine kinase, mer, that is expressed in monocytes, we generated mice (merkd) that lack the signaling tyrosine kinase domain. Upon LPS challenge, merkd animals died of endotoxic shock (15/17, 88.2%), whereas control wild-type mice survived (1/15, 6.7% died). Susceptible merkd mice exhibited edema, leukocyte infiltration, and signs of endotoxic shock that correlated with higher levels of TNF-α found in the serum of merkd mice as compared with wild-type control animals. Death due to LPS-induced endotoxic shock in merkd mice was blocked by administration of anti-TNF-α Ab, suggesting that overproduction of this cytokine was principally responsible for the heightened suseptibility. The increase in TNF-α production appeared to be the result of a substantial increase in the LPS-dependent activation of NF-κB nuclear translocation resulting in greater TNF-α production by macrophages from merkd mice. Thus, Mer receptor tyrosine kinase signaling participates in a novel inhibitory pathway in macrophages important for regulating TNF-α secretion and attenuating endotoxic shock.

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Crossref · 10.4049/jimmunol.162.6.3498

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  • Camenish et al. showed that Mertk knockdown was associated with an enhanced Tnf response and exacerbated response to endotoxemia.

    “Consistent with our findings, Camenish et al. showed that Mertk knockdown was associated with an enhanced Tnf response and exacerbated response to endotoxemia [32].”

    From Multifaceted response of microglia in the cuprizone model of demyelination (2026) · cites this paper as [32]

    The Results report that mice lacking Mer kinase signaling had higher TNF-α production and greater susceptibility to LPS-induced endotoxic shock. But these were kinase-domain-deficient mice, not Mertk knockdown mice: the Results describe a targeted mutation that retained expression of part of the receptor. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Similar effects were observed in response to dying cells in macrophages lacking Rac1 or the efferocytosis receptors merTK and TIM4.

    “Similar effects were observed in response to dying cells in macrophages lacking Rac1 or the efferocytosis receptors merTK and TIM4 (Cai et al., 2018; Camenisch et al., 1999; Martinez et al., 2011; Scott et al., 2001; Thorp et al., 2008), consistent with this idea.”

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Research works printed but not linked: 1

  1. Mohn, A., and B. Koller. 1995. Genetic manipulation of embryonic stem cells. In DNA Cloning-Mammalian Systems: A Practical Approach. Oxford University Press, Oxford, p. 142.

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Authors
Camenisch, T. D., Koller, B. H., Earp, H. S., & Matsushima, G. K.
Affiliations
University of North Carolina at Chapel Hill (US)
Venue
The Journal of Immunology
Published
1999-03
Volume
162
Issue
6
Pages
3498-3503
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W4313344687
Cited by
290
References
31
Citations by year
2026: 7 · 2025: 6 · 2024: 21 · 2023: 15 · 2022: 15 · 2021: 14 · 2020: 18 · 2019: 17 · 2018: 16 · 2017: 17 · 2016: 13 · 2015: 13 · 2014: 12 · 2013: 13 · 2012: 5
FWCI
1.72
Type
journal article
Language
en
Open access
Locations
The Journal of Immunology (publishedVersion)
Funders
University of North Carolina at Chapel Hill
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
  • Health Sciences › Medicine › Epidemiology › Sepsis Diagnosis and Treatment
Keywords
Mer receptor tyrosine kinase, TNF-alpha production, endotoxic shock, lipopolysaccharide, endotoxemia, sepsis, monocytes, macrophages, NF-κB nuclear translocation, anti-TNF-alpha antibody, receptor signaling

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