Cited by 639Regulation of Appetite and ObesityCytokine Signaling Pathways and InteractionsAdipokines, Inflammation, and Metabolic Diseases

The role of SOCS-3 in leptin signaling and leptin resistance

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Bjørbæk, Christian, El-Haschimi, Karim, Frantz, J. Daniel, Flier, Jeffrey S.·1999·Journal of Biological Chemistry

Abstract

We earlier demonstrated that leptin induces expression of SOCS-3 mRNA in the hypothalamus. Furthermore, transfection data suggest that SOCS-3 is an inhibitor of leptin signaling. However, little is known about the regulation of SOCS-3 expression by leptin and the mechanism by which SOCS-3 inhibits leptin action. We here show that in CHO cells stably expressing the long form of the leptin receptor (CHO-OBRl), leptin induces transient expression of endogenous SOCS-3 mRNA but not of CIS, SOCS-1, or SOCS-2 mRNA. SOCS-3 protein levels were maximal after 2-3 h of leptin treatment and remained elevated at 20 h. Furthermore, in leptin-pretreated CHO-OBRl cells, proximal leptin signaling was blocked for more than 20 h after pretreatment, thus correlating with increased SOCS-3 expression. Leptin pretreatment did not affect cell surface expression of leptin receptors as measured by (125)I-leptin binding assays. In transfected COS cells, forced expression of SOCS-3 results in inhibition of leptin-induced tyrosine phosphorylation of JAK2. Finally, JAK2 co-immunoprecipitates with SOCS-3 in lysates from leptin-treated COS cells. These results suggest that SOCS-3 is a leptin-regulated inhibitor of proximal leptin signaling in vivo. Excessive SOCS-3 activity in leptin-responsive cells is therefore a potential mechanism for leptin resistance, a characteristic feature in human obesity.

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Crossref · 10.1074/jbc.274.42.30059

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Authors
Bjørbæk, C., El-Haschimi, K., Frantz, J. D., & Flier, J. S.
Affiliations
  • Beth Israel Deaconess Medical Center (US)
  • Joslin Diabetes Center (US)
Corresponding author
Flier, Jeffrey S.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1999-10
Volume
274
Issue
42
Pages
30059-30065
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2091484442
Cited by
639
References
52
Citations by year
2026: 1 · 2025: 9 · 2024: 9 · 2023: 8 · 2022: 11 · 2021: 14 · 2020: 18 · 2019: 20 · 2018: 17 · 2017: 19 · 2016: 19 · 2015: 20 · 2014: 34 · 2013: 33 · 2012: 31
FWCI
9.91
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (DK-R37-28082, R37DK028082)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
SOCS3, leptin signaling, leptin resistance, leptin receptor, SOCS1, SOCS2, obesity, hypothalamus, signal transduction inhibition
MeSH terms
Suppressor of Cytokine Signaling 3 Protein, Animals, Carrier Proteins, Gene Expression Regulation, Cricetinae, Humans, Proteins, Receptors, Cell Surface, Recombinant Proteins, Repressor Proteins, RNA, Messenger, Transcription Factors, Signal Transduction, CHO Cells, Leptin, Suppressor of Cytokine Signaling Proteins, Receptors, Leptin

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