Cited by 18Protein Kinase Regulation and GTPase SignalingProtein Tyrosine PhosphatasesPI3K/AKT/mTOR signaling in cancer

Regulation of the Src Homology 2 Domain-containing Inositol 5′-Phosphatase (SHIP1) by the Cyclic AMP-dependent Protein Kinase

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Zhang, Jun, Walk, Scott F., Ravichandran, Kodi S., Garrison, James C.·2009·Journal of Biological Chemistry

Abstract

Many agents that activate hematopoietic cells use phos pha tidyl ino si tol 3,4,5-trisphosphate (PtdIns 3,4,5-P(3)) to initiate signaling cascades. The SH2 domain-containing inositol 5' phosphatase, SHIP1, regulates hematopoietic cell function by opposing the action of phos pha tidyl ino si tol 3-kinase and reducing the levels of PtdIns 3,4,5-P(3). Activation of the cyclic AMP-de pend ent protein kinase (PKA) also opposes many of the pro-inflammatory responses of hematopoietic cells. We tested to see whether the activity of SHIP1 was regulated via phos pho ryl a tion with PKA. We prepared pure recombinant SHIP1 from HEK-293 cells and found it can be rapidly phos pho ryl a ted by PKA to a stoichiometry of 0.6 mol of PO(4)/mol of SHIP1. In (32)P-labeled HEK-293 cells transfected with SHIP1, stimulation with Sp-adenosine 3',5'-cyclic monophosphorothioate triethylammonium salt hydrate (Sp-cAMPS) or activation of the beta-adrenergic receptor increased the phos pho ryl a tion state of SHIP1. Inhibition of protein phosphatase activity with okadaic acid also increased the phos pho ryl a tion of SHIP1. Phosphorylation of SHIP1 in vitro or in cells by PKA increased the 5' phosphatase activity of SHIP1 by 2-3-fold. Elevation of Ca(2+) in DT40 cells in response to B cell receptor cross-linking, an indicator of PtdIns 3,4,5-P(3) levels, was markedly blunted by pretreatment with Sp-cAMPS. This effect was absent in SHIP(-/-) DT40 cells showing that the effect of Sp-cAMPS in DT40 cells is SHIP1-de pend ent. Sp-cAMPS also blunted the ability of the B cell receptor to increase the phos pho ryl a tion of Akt in DT40 and A20 cells. Overall, activation of G protein-coupled receptors that raise cyclic AMP cause SHIP1 to be phosphorylated and stimulate its inositol phosphatase activity. These results outline a novel mechanism of SHIP1 regulation.

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  • SHIP1 can be phosphorylated at Ser440 within the 5' phosphatase domain by PKA to increase phosphatase activity.

    “SHIP1 can be phosphorylated at Ser440 within the 5’ phosphatase domain by PKA to increase the phosphatase activity.”

    From Microglial function, INPP5D/SHIP1 signaling, and NLRP3 inflammasome activation: implications for Alzheimer’s disease (2023) · cites this paper as [110]

    The Results (page unavailable) show that PKA phosphorylates SHIP1 and increases its catalytic activity about twofold. Our copy does not identify Ser440 as the phosphorylation site or place that site within the 5′-phosphatase domain, so those specifics are not supported. (LLM, conf=0.89)

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  1. Sastri, M., Barraclough, D. M., Carmichael, P. T., and Taylor, S. S. (2005) Proc. Natl. Acad. Sci. U.S.A. 102, 349 -354

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Authors
Zhang, J., Walk, S. F., Ravichandran, K. S., & Garrison, J. C.
Affiliations
University of Virginia (US)
Corresponding author
Garrison, James C.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-07
Volume
284
Issue
30
Pages
20070-20078
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2017164427
Cited by
18
References
47
Citations by year
2026: 1 · 2024: 1 · 2023: 2 · 2021: 1 · 2018: 1 · 2017: 2 · 2014: 1 · 2013: 2 · 2012: 3
FWCI
0.94
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM076236)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK199520, P30DK067629)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
SHIP1, protein kinase A, protein phosphorylation, phosphatidylinositol 3-kinase, hematopoietic cells, beta-adrenergic receptors, B cell receptor signaling, Akt phosphorylation, G protein-coupled receptors, okadaic acid, calcium signaling, phosphatase activity, anti-inflammatory signaling
MeSH terms
Inositol Polyphosphate 5-Phosphatases, Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatases, Cyclic AMP, Animals, B-Lymphocytes, Cell Line, Humans, Kidney, Phosphoric Monoester Hydrolases, Phosphorylation, Receptors, Adrenergic, beta, Recombinant Proteins, Thionucleotides, Gene Expression, Lymphoma, B-Cell, Cyclic AMP-Dependent Protein Kinases, src Homology Domains, Cell Line, Tumor, Mice, Protein Phosphatase 1

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