Cited by 56Growth Hormone and Insulin-like Growth FactorsCytokine Signaling Pathways and InteractionsLiver physiology and pathology

Distinct mechanisms of induction of hepatic growth hormone resistance by endogenous IL-6, TNF-α, and IL-1β

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Zhao, Yueshui, Xiao, Xiaoqiu, Frank, Stuart J., Lin, Herbert Y., Xia, Yin·2014·American Journal of Physiology-Endocrinology and Metabolism

Abstract

During inflammation, the liver becomes resistant to growth hormone (GH) actions, leading to downregulation of the GH target gene IGF-I and activation of catabolism. Proinflammatory cytokines IL-6, TNF-α, and IL-1β are critically involved in the pathogenesis of hepatic GH resistance. However, the mechanisms used by endogenous IL-6, TNF-α, and IL-1β to inhibit the hepatic GH-IGF-I pathway during inflammation are not fully understood. Here, we show that TNF-α and IL-1β inhibited GH receptor (GHR) expression but had minor effects on the downstream suppressor of cytokine signaling (SOCS)3, while IL-6 induced SOCS3 expression but had no effect on GHR expression in Huh-7 cells. Consistent with the in vitro observations, neutralization of TNF-α and IL-1β in mouse models of inflammation did not significantly alter SOCS3 expression stimulated by inflammation but restored GHR and IGF-I expression suppressed by inflammation. Neutralization of IL-6 did not alter inflammation-suppressed GHR expression but drastically reduced the inflammation-stimulated SOCS3 expression and restored IGF-I expression. Interestingly, when the GH-IGF-I pathway was turned off by maximal inhibition of GHR expression, IL-6 and SOCS3 were no longer able to regulate IGF-I expression. Taken together, our results suggest that TNF-α/IL-1β and IL-6 use distinct mechanisms to induce hepatic GH resistance, with TNF-α and IL-1β acting primarily on GHR and IL-6 acting primarily on SOCS3. IL-6 action may be superseded by factors such as TNF-α and IL-1β that inhibit GHR expression.

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  1. [21]21. List EO, Berryman DE, Funk K, Jara A, Kelder B, Wang F, Stout MB, Zhi X, Sun L, White TA, Lebrasseur NK, Pirtskhalava T, Tchkonia T, Jensen EA, Zhang W, Masternak MM, Kirkland JL, Miller RA, Bartke A, Kopchick JJ. Liver-specific GH receptor gene disrupted (LiGHRKO) mice have decreased endocrine IGF-I, increased local IGF-I as well as altered body size, body composition and adipokine profiles. Endocrinology Feb 11:en20132086. [Epub ahead of print], 2014 [DOI] [PMC free article] [PubMed] [Google Scholar]

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Authors
Zhao, Y., Xiao, X., Frank, S. J., Lin, H. Y., & Xia, Y.
Affiliations
  • Chinese University of Hong Kong (HK)
  • Children's Hospital of Chongqing Medical University (CN)
  • University of Alabama at Birmingham (US)
  • Harvard University (US)
Corresponding author
Xiao, Xiaoqiu
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
2014-07-15
Volume
307
Issue
2
Pages
E186-E198
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W1985413489
Cited by
56
References
33
Citations by year
2026: 9 · 2025: 5 · 2024: 6 · 2023: 4 · 2022: 2 · 2021: 5 · 2020: 8 · 2019: 2 · 2018: 9 · 2017: 3 · 2016: 1 · 2015: 1 · 2014: 1
FWCI
1.61
Type
journal article
Language
en
Open access
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Hong Kong
  • Chinese University of Hong Kong
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01 DK46395, R01DK058259, R01DK046395, R01DK071837, R-01 DK58259)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
Keywords
interleukin-6, TNF-α, IL-1β, growth hormone receptor, insulin-like growth factor I, SOCS3, inflammatory cytokines, inflammation, liver, Huh7 cells, cytokine neutralization
MeSH terms
Animals, Cells, Cultured, Humans, Inflammation, Liver, Male, Mice, Inbred C57BL, Nerve Tissue Proteins, Receptors, Somatotropin, Growth Hormone, Tumor Necrosis Factor-alpha, Interleukin-6, Mice, Knockout, Neural Cell Adhesion Molecules, Mice, Interleukin-1beta

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