Original Literature | Model OverView |
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Publication
Title
The p110delta subunit of phosphoinositide 3-kinase is required for thelipopolysaccharide response of mouse B cells.
Affiliation
Laboratory of Lymphocyte Signalling and Development, Babraham Institute,Babraham Research Campus, Cambridge CB2 4AT, UK. barbara.j.hebeis@gsk.com
Abstract
PI3K (phosphoinositide 3-kinase) I(A) family members contain a regulatorysubunit and a catalytic subunit. The p110delta catalytic subunit is expressedpredominantly in haematopoietic cells. There, among other functions, itregulates antigen receptor-mediated responses. Using mice deficient in thep110delta subunit of PI3K, we investigated the role of this subunit in LPS(lipopolysaccharide)-induced B cell responses, which are mediated by Toll-likereceptor 4 and RP105. After injection of DNP-LPS (where DNP stands for2,4-dinitrophenol), p110delta(-/-) mice produced reduced levels of DNP-specificIgM and IgG when compared with wild-type mice. In vitro, the proliferation andup-regulation of surface activation markers such as CD86 and CD25 induced by LPSand an antibody against RP105 were decreased. We analysed the activation stateof key components of the LPS pathway in B cells to determine whether there was adefect in signalling in p110delta(-/-) B cells. They showed normalextracellular-signal-regulated kinase phosphorylation, but anti-RP105-inducedprotein kinase B, IkappaB (inhibitor of nuclear factor kappaB) and c-JunN-terminal kinase activation was severely reduced. This demonstrates that thep110delta subunit of PI3K is involved in the LPS response in B cells and mayrepresent a link between the innate and the adaptive immune system.
PMID
15494016
|
Entity
IL-2Ralpha
--
MO000017214
cso30:c:Protein
cso30:i:CC_CellComponent
--
csml-variable:Double
m2080
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InterPro | IPR006209 |
TRANSPATH | MO000017214 |
--
p110delta
--
MO000017404
cso30:c:Protein
cso30:i:CC_CellComponent
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csml-variable:Double
m2236
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InterPro | IPR002420 |
TRANSPATH | MO000017404 |
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--
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IKappaB {p}
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PI3K
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NF-kappaB{active}
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TRANSPATH | MO000000058 |
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NF-KappaB:IKappaB
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wortmannin
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TLR4:LPS
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anti-RP105
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PMID: 15494016, 10196138 A major ligand inducing innate responses via TLR4 (Toll-like receptor 4) is LPS (lipopolysaccharide)
p10
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PMID: 15494016 However, preincubation ofBcells with wortmannin, a PI3K-specific inhibitor, completely abrogated ERK phosphorylation in response to anti-RP105.
p3
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PMID;15494016 up-regulation of the other three markers (CD25,CD69 and CD86) was reduced in p110 delta knockout cells.
p3
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m103353*m10*m2236*0.1
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PMID;15494016 up-regulation of the other three markers (CD25,CD69 and CD86) was reduced in p110 delta knockout cells.
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m93745*m2236*m10*0.1
nodelay
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PMID;15494016 up-regulation of the other three markers (CD25,CD69 and CD86) was reduced in p110 delta knockout cells.
--
and
mass
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--
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PMID: 15494016 However, preincubation ofBcells with wortmannin, a PI3K-specific inhibitor, completely abrogated ERK phosphorylation in response to anti-RP105. PMID;15494016 up-regulation of the other three markers (CD25,CD69 and CD86) was reduced in p110 delta knockout cells.
p3
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m15*m5*m13*0.1
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PMID:15494016,11369709 PI3K has been suggested to be involved in NF-¦ÊB (nuclear factor ¦ÊB) activation in the LPS response
p4
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PMID:15494016 The activation of c-Jun N-terminal kinase and PKB was defective in p110delta knockout B cells downstream of the LPS receptor, but ERK phosphorylation in response to RP105 stimulation was not affected.
p4
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m2236*m5*m45*0.1
nodelay
--
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PMID:15494016 The activation of c-Jun N-terminal kinase and PKB was defective in p110delta knockout B cells downstream of the LPS receptor, but ERK phosphorylation in response to RP105 stimulation was not affected.
p3
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cso30:i:ME_Translation
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m2236*m93219*m19*0.1
nodelay
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PMID;15494016 up-regulation of the other three markers (CD25,CD69 and CD86) was reduced in p110 delta knockout cells.
p3
p3
cso30:i:ME_UnknownActivation
cso30:i:CC_Extracellular
--
--
and
mass
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m10*m13*m15*0.1
nodelay
--
0
PMID:15494016,11369709 PI3K has been suggested to be involved in NF-¦ÊB (nuclear factor ¦ÊB) activation in the LPS response
p4
p4
cso30:i:ME_Phosphorylation
cso30:i:CC_Extracellular
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--
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m10*m21*m2236*0.1
nodelay
--
0
PMID:15494016 The activation of c-Jun N-terminal kinase and PKB was defective in p110delta knockout B cells downstream of the LPS receptor, but ERK phosphorylation in response to RP105 stimulation was not affected.
p4
p5
cso30:i:ME_Phosphorylation
cso30:i:CC_Extracellular
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m10*m45*m2236*0.1
nodelay
--
0
PMID:15494016 The activation of c-Jun N-terminal kinase and PKB was defective in p110delta knockout B cells downstream of the LPS receptor, but ERK phosphorylation in response to RP105 stimulation was not affected.
p6
p6
cso30:i:ME_Phosphorylation
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--
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m2236*m19*m15*0.1
nodelay
--
0
PMID:15494016 I¦ÊB phosphorylation in response to RP105 stimulation was severely reduced in p110delta knockout B cells.
p7
p7
cso30:i:ME_Binding
cso30:i:CC_Extracellular
--
--
and
mass
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stoichiometry:c23 : 1
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m157177*m1632*0.1
nodelay
--
0
PMID: 15494016 LPS activates signalling through TLR4 and RP105 in parallel, leading to the activation of downstream signalling targets such as NF-¦ÊB and MAP kinases.
p3
p8
cso30:i:ME_Translation
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--
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m2236*m103353*m19*0.1
nodelay
--
0
PMID;15494016 up-regulation of the other three markers (CD25,CD69 and CD86) was reduced in p110 delta knockout cells.
p3
p9
cso30:i:ME_Translation
cso30:i:CC_Extracellular
--
--
and
mass
coefficient1:0.1
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stoichiometry:c6 : 1
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stoichiometry:c30 : 1
m2236*m93745*m19*0.1
nodelay
--
0
PMID;15494016 up-regulation of the other three markers (CD25,CD69 and CD86) was reduced in p110 delta knockout cells.
cso30:c:InputProcess
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