| TREM2- and DAP12-dependent activation of PI3K requires DAP10 and is inhibited by SHIP1. | |
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MedLine Citation:
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PMID: 20484116 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The activation and fusion of macrophages and of osteoclasts require the adaptor molecule DNAX-activating protein of 12 kD (DAP12), which contains immunoreceptor tyrosine-based activation motifs (ITAMs). TREM2 (triggering receptor expressed on myeloid cells-2) is the main DAP12-associated receptor in osteoclasts and, similar to DAP12 deficiency, loss of TREM2 in humans leads to Nasu-Hakola disease, which is characterized by bone cysts and dementia. Furthermore, in vitro experiments have shown that deficiency in DAP12 or TREM2 leads to impaired osteoclast development and the formation of mononuclear osteoclasts. Here, we demonstrate that the ligation of TREM2 activated phosphatidylinositol 3-kinase (PI3K), extracellular signal-regulated kinase 1 (ERK1) and ERK2, and the guanine nucleotide exchange factor Vav3; induced the mobilization of intracellular calcium (Ca(2+)) and the reorganization of actin; and prevented apoptosis. The signaling adaptor molecule DAP10 played a key role in the TREM2- and DAP12-dependent recruitment of PI3K to the signaling complex. Src homology 2 (SH2) domain-containing inositol phosphatase-1 (SHIP1) inhibited TREM2- and DAP12-induced signaling by binding to DAP12 in an SH2 domain-dependent manner and preventing the recruitment of PI3K to DAP12. These results demonstrate a previously uncharacterized interaction of SHIP1 with DAP12 that functionally limits TREM2- and DAP12-dependent signaling and identify a mechanism through which SHIP1 regulates key ITAM-containing receptors by directly blocking the binding and activation of PI3K. |
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Authors:
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Qisheng Peng; Shikha Malhotra; James A Torchia; William G Kerr; K Mark Coggeshall; Mary Beth Humphrey |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-05-18 |
Journal Detail:
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Title: Science signaling Volume: 3 ISSN: 1937-9145 ISO Abbreviation: Sci Signal Publication Date: 2010 |
Date Detail:
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Created Date: 2010-05-20 Completed Date: 2010-08-24 Revised Date: 2011-06-06 |
Medline Journal Info:
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Nlm Unique ID: 101465400 Medline TA: Sci Signal Country: United States |
Other Details:
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Languages: eng Pagination: ra38 Citation Subset: IM |
Affiliation:
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Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptor Proteins, Signal Transducing
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physiology* Animals Cell Division / physiology Cell Line Enzyme Activation Membrane Glycoproteins / physiology* Mice Mice, Inbred C57BL Osteoclasts / cytology Phosphatidylinositol 3-Kinases / antagonists & inhibitors, metabolism* Phosphoric Monoester Hydrolases / physiology* Phosphorylation Receptors, Immunologic / physiology* Signal Transduction src Homology Domains |
| Grant Support | |
ID/Acronym/Agency:
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DE019398/DE/NIDCR NIH HHS; HL085580/HL/NHLBI NIH HHS; HL72523/HL/NHLBI NIH HHS; P20 RR0201143/RR/NCRR NIH HHS; P20 RR020143-047656/RR/NCRR NIH HHS; P20 RR020143-057069/RR/NCRR NIH HHS; P20 RR020143-066749/RR/NCRR NIH HHS; R01 DE019398-01/DE/NIDCR NIH HHS; R01 DE019398-02/DE/NIDCR NIH HHS; R01 DE019398-04/DE/NIDCR NIH HHS; U19 AI062629/AI/NIAID NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Adaptor Proteins, Signal Transducing; 0/Hcst protein, mouse; 0/Membrane Glycoproteins; 0/Receptors, Immunologic; 0/Trem2 protein, mouse; 0/Tyrobp protein, mouse; EC 2.7.1.-/Phosphatidylinositol 3-Kinases; EC 3.1.3.-/Phosphoric Monoester Hydrolases; EC 3.1.3.56/inositol-1,4,5-trisphosphate 5-phosphatase |
| Comments/Corrections | |
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