Cited by 1,040Cytokine Signaling Pathways and InteractionsPsoriasis: Treatment and PathogenesisReceptor Mechanisms and Signaling

IL-6 Trans-Signaling via the Soluble IL-6 Receptor: Importance for the Pro-Inflammatory Activities of IL-6

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Rose-John, Stefan·2012·International Journal of Biological Sciences

Abstract

Interleukin-6 (IL-6) is a cytokine with many activities. It has functions in the regulation of the immune system and the nervous system. Furthermore, IL-6 is involved in liver regeneration and in the metabolic control of the body. On target cells, IL-6 binds to an 80 kDa IL-6 receptor (IL-6R). The complex of IL-6 and IL-6R associates with a second protein, gp130, which thereupon dimerizes and initiates intracellular signaling. Whereas gp130 is expressed on all cells, IL-6R is only present on few cells in the body including hepatocytes and some leukocytes. Cells, which do not express IL-6R cannot respond to the cytokine, since gp130 alone has no measurable affinity for IL-6. Interestingly, a soluble form of IL-6R (sIL-6R) comprising the extracellular portion of the receptor can bind IL-6 with a similar affinity as the membrane bound IL-6R. The complex of IL-6 and sIL-6R can bind to gp130 on cells, which do not express the IL-6R, and which are unresponsive to IL-6. This process has been called trans-signaling. Here I will review published evidence that IL-6 trans-signaling is pro-inflammatory whereas classic IL-6 signaling via the membrane bound IL-6R is needed for regenerative or anti-inflammatory activities of the cytokine. Furthermore, the detailed knowledge of IL-6 biology has important consequences for therapeutic strategies aimed at the blockade of the cytokine IL-6.

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  • The balance between mbIL-6R and sIL-6R availability, along with signal duration and tissue context, determines whether IL-6 acts in a protective or pathogenic manner.

    “Therefore, the balance between mbIL-6R and sIL-6R availability, along with signal duration and tissue context, determines whether IL-6 acts in a protective or pathogenic manner [40].”

    From Exercise-Induced Muscle–Fat Crosstalk: Molecular Mediators and Their Pharmacological Modulation for the Maintenance of Metabolic Flexibility in Aging (2025) · cites this paper as [40]

    The “IL-6 Trans-signaling is pro-inflammatory” section distinguishes pro-inflammatory trans-signaling through sIL-6R from regenerative or anti-inflammatory classic signaling through membrane-bound IL-6R. The blood-buffer section also discusses how receptor and cytokine availability, including unknown local levels, affect signaling. The “Transgenic strategies” section says prolonged signaling changes cellular responses, but does not establish signal duration as a determinant of whether IL-6 is protective or pathogenic. Page numbers are unavailable in our copy. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • HyIL-6 triggers signaling in all cells expressing gp130, producing a more robust and homogenous signaling output.

    “HyIL-6 triggers signaling in all cells expressing gp130, producing a more robust and homogenous signaling output”

    From CDK8 fine-tunes IL-6 transcriptional activities by limiting STAT3 resident time at the gene loci (2020) · cites this paper as Rose-John, 2012

    The Introduction (page not provided) says that gp130-expressing cells can be stimulated through IL-6 trans-signaling even without membrane IL-6R. The section “Protein tools to study IL-6 trans-signaling” reports that Hyper-IL-6 is 100–1,000 times more active than separate IL-6 and sIL-6R on gp130-expressing cells, supporting a more robust response. It does not establish that the signaling output is homogeneous across those cells. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Classic and trans-signaling promote anti- and pro-inflammatory responses, respectively.

    “This is in line with the view that classic and trans-signaling promote anti- and pro-inflammatory responses, respectively (85)”

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Authors
Rose-John, S.
Venue
International Journal of Biological Sciences
Published
2012
Volume
8
Issue
9
Pages
1237-1247
ISSN
1449-2288 (ISSN-L)
OpenAlex
W2100478793
Cited by
1,040
References
110
Citations by year
2026: 87 · 2025: 98 · 2024: 77 · 2023: 73 · 2022: 94 · 2021: 108 · 2020: 107 · 2019: 76 · 2018: 72 · 2017: 65 · 2016: 49 · 2015: 48 · 2014: 54 · 2013: 30 · 2012: 1
FWCI
4.28
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • International Journal of Biological Sciences (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (SFB654, SFB841, project C1; SFB877, project A1, SFB 877, SFB841 project C1, SFB877, project A1, SFB 841)
  • Exzellenzclusters Entzündungsforschung
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Immunology and Microbiology › Immunology › Psoriasis: Treatment and Pathogenesis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
Keywords
interleukin-6, IL-6 trans-signaling, soluble IL-6 receptor, gp130, IL-6 receptor, pro-inflammatory activity, cytokine signaling, liver regeneration, anti-inflammatory activity, IL-6 inhibition, hepatocytes, leukocytes
MeSH terms
Animals, Humans, Mice, Transgenic, Models, Biological, Solubility, Signal Transduction, Interleukin-6, Receptors, Interleukin-6, Cytokine Receptor gp130, Mice

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