Cited by 537Cytokine Signaling Pathways and InteractionsRegulation of Appetite and ObesityProtein Tyrosine Phosphatases

SOCS3 Mediates Feedback Inhibition of the Leptin Receptor via Tyr985

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Bjørbæk, Christian, Lavery, Hugh J., Bates, Sarah H., Olson, Ryan K., Davis, Sarah M., Flier, Jeffrey S., Myers, Martin G.·2000·Journal of Biological Chemistry

Abstract

During leptin signaling, each of the phosphorylated tyrosine residues on the long form of the leptin receptor (LRb) mediates distinct signals. Phosphorylated Tyr(1138) binds STAT3 to mediate its tyrosine phosphorylation and transcriptional activation, while phosphorylated Tyr(985) binds the tyrosine phosphatase SHP-2 and reportedly mediates both activation of ERK kinases and inhibition of LRb-mediated STAT3 activation. We show here that although mutation of Tyr(985) does not alter STAT3 signaling by erythropoietin receptor-LRb (ELR) chimeras in transfected 293 cells at short times of stimulation, this mutation enhances STAT3 signaling at longer times of stimulation (>6 h). These data suggest that Tyr(985) may mediate feedback inhibition of LRb signaling by an LRb-induced LRb inhibitor, such as SOCS3. Indeed, SOCS3 binds specifically to phosphorylated Tyr(985) of LRb, and SOCS3 fails to inhibit transcription by ELR following mutation of Tyr(985), suggesting that SOCS3 inhibits LRb signaling by binding to phosphorylated Tyr(985). Additionally, overexpression of SOCS3, but not SHP-2, impairs ELR signaling, and the overexpression of SHP-2 blunts SOCS3-mediated inhibition of ELR signaling. Thus, our data suggest that in addition to mediating SHP-2 binding and ERK activation during acute stimulation, Tyr(985) of LRb mediates feedback inhibition of LRb signaling by binding to LRb-induced SOCS3.

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Crossref · 10.1074/jbc.m007577200

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  • Phosphorylation of Tyr985 recruits SHP-2 to LepRb, leading to ERK pathway activation in cultured cells and recruitment of SOCS-3.

    “Phosphorylation of Tyr985 recruits SH2-domain-containing phosphatase-2 (SHP-2) to LepRb, leading to the activation of the extracellular signal regulated (ERK) signaling pathway in cultured cells, as well as the recruitment of suppressor of cytokine signaling-3 (SOCS-3), a negative regulator of LepRb signaling (6, 21, 22).”
  • Tyr985 attenuates leptin action in vivo, presumably by serving as the SOCS-3 binding site.

    “These results support data from cultured cells (22) suggesting that Tyr985 attenuates leptin action in vivo, presumably by serving as the SOCS-3 binding site (24).”

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Authors
Bjørbæk, C., Lavery, H. J., Bates, S. H., Olson, R. K., Davis, S. M., Flier, J. S., & Myers, M. G.
Affiliations
  • Beth Israel Deaconess Medical Center (US)
  • Joslin Diabetes Center (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2000-12
Volume
275
Issue
51
Pages
40649-40657
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2168692939
Cited by
537
References
65
Citations by year
2026: 6 · 2025: 11 · 2024: 12 · 2023: 9 · 2022: 16 · 2021: 19 · 2020: 25 · 2019: 14 · 2018: 21 · 2017: 18 · 2016: 18 · 2015: 19 · 2014: 34 · 2013: 30 · 2012: 29
FWCI
9.25
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, DKR0156731)
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
Keywords
SOCS3, leptin receptor, product inhibition, STAT3 signaling, SHP2, receptor tyrosine phosphorylation, ERK activation, transcriptional activation
MeSH terms
Suppressor of Cytokine Signaling 3 Protein, Carrier Proteins, Cell Line, Feedback, Humans, Proteins, Receptors, Cell Surface, Repressor Proteins, Transcription Factors, Tyrosine, Signal Transduction, Suppressor of Cytokine Signaling Proteins, Receptors, Leptin

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