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当前位置:首页 > 品牌资讯 >磷脂酰肌醇3-激酶(PI3K)信号通路
磷脂酰肌醇3-激酶(PI3Ks)蛋白家族参与细胞存活、生长、代谢和血糖稳态等多种细胞功能的调控。 PI3K激酶活性升高通常与多种癌症相关。顾名思义,PI3Ks磷酸化磷脂酰肌醇PI(一种膜磷脂)肌醇环的第3位碳原子。PI在细胞膜组分中所占比例较小,比磷脂酰胆碱、磷脂酰乙醇胺和磷脂酰丝氨酸含量少, 但在脑细胞膜中,含量较为丰富,达磷脂总量的10%。

PI的肌醇环上有5个可被磷酸化的位点,多种激酶可磷酸化PI肌醇环上的第4及第5位点,因而通常在这两个位点之一或两位点发生磷酸化修饰,尤其发生在质膜内侧。通常,PI-4,5-二磷酸(PIP2)在磷脂酶C的作用下,产生二酰甘油(DAG)和肌醇-1,4,5-三磷酸。PI3K转移一个磷酸基团至位点3,形成的产物对细胞的功能具有重要的影响。譬如,单磷酸化的PI-3-磷酸,能刺激细胞迁移(cell trafficking),而未磷酸化的则不能。PI-3,4-二磷酸则可促进细胞的增殖(生长)和增强对凋亡的抗性,而其前体分子PI-4-磷酸则不然。PIP2转换为PI-3,4,5-三磷酸,可调节细胞的黏附、生长和存活。

 


Figure 1. Receptor signaling to PI3K

PI3K的活化
PI3K可分为3类,其结构与功能各异。其中研究最广泛的为I类PI3K, 此类PI3K为异源二聚体,由一个调节亚基和一个催化亚基组成。调节亚基含有SH2和SH3结构域,与含有相应结合位点的靶蛋白相作用。该亚基通常称为p85, 参考于第一个被发现的亚型(isotype),然而目前已知的6种调节亚基,大小从50至110kDa不等。催化亚基有4种,即p110α, β,δ,γ,而δ仅限于白细胞,其余则广泛分布各种细胞中。

PI3K的活化很大程度上参与到靠近其质膜内侧的底物。多种生长因子和信号传导复合物,包括成纤维细胞生长因子(FGF)、血管内皮生长因子(VEGF)、人生长因子(HGF)、血管位蛋白I(Ang1)和胰岛素都能启始PI3K的激活过程。这些因子激活受体酪氨酸激酶(RTK),从而引起自磷酸化。受体上磷酸化的残基为异源二聚化的PI3Kp85亚基提供了一个停泊位点(docking site)。然而在某些情况下,受体磷酸化则会介导募集一个接头蛋白(adaptor protein)。比如,当胰岛素激活其受体后,则必须募集一个胰岛素受体底物蛋白(IRS),来促进PI3K的结合。相似的,当整连蛋白integrin(非RTK)被激活后,粘着斑激酶(FAK) 则作为接头蛋白,将PI3K通过其p85停泊。但在以上各情形下,p85亚基的SH2和SH3结构域均在一个磷酸化位点与接头蛋白结合。PI3K募集到活化的受体后,起始多种PI中间体的磷酸化。与癌肿尤其相关的PI3K转化PIP2为PIP3。


PIP3作为锚定物(anchor)和激活物(activator)
许多蛋白含有一个Pleckstrin Homology(PH)结构域,因而可使其与PI-3,4-P2或PI-3,4,5-P3相结合。这种相互作用可以控制蛋白与膜结合的时间与定位,通过这种方式来调节蛋白的活性。蛋白与脂质间的这种相互作用亦可能引起蛋白构像的变化而改变蛋白的功能。PI3K激活的结果是在质膜上产生第二信使PIP3, PIP3与细胞内含有PH结构域的信号蛋白AKT和PDK1(phosphoinositide dependent kinase-1)结合, 促使PDK1磷酸化AKT蛋白的Ser308导致AKT活化。其他PDK1的底物还包括PKC(蛋白激酶C)、S6K(p70S6)和SGK(serum/
glucocorticoid regulated kinases) 。AKT, 亦称为蛋白激酶B(PKB),是PI3K下游主要的效应物。AKT可分为3种亚型(AKT1、AKT2、AKT3或PKBα, PKBβ,PKBγ),3种亚型的功能各异,但也有重叠。


AKT的作用
活化的AKT通过磷酸化多种酶、激酶和转录因子等下游因子,进而调节细胞的功能。譬如,AKT刺激葡萄糖的代谢:AKT激活AS160(AKT底物,160kDa),进而促进GLUT4转座和肌细胞对葡萄糖的吸收。AKT也磷酸化GSK3β而抑制其活性,从而促进葡萄糖的代谢和调节细胞的周期。AKT磷酸化TSC1/2(tuberous sclerosis complex),可阻止其对小G蛋白Rheb(Ras homology enriched in brain)的负调控,进而使得Rheb富集以及对纳巴霉素(rapamycin)敏感的mTOR复合体(mTORC1)的活化。这些作用可激活蛋白的翻译,增强细胞的生长。

AKT通过下游多种途径对靶蛋白进行磷酸化而发挥抗凋亡作用。ATK激活IkB激酶(IKKα),导致NF-κB的抑制剂IκB的降解, 从而使NF-κB从细胞质中释放出来进行核转位, 激活其靶基因而促进细胞的存活。AKT磷酸化Bcl-2家族成员BAD,使其与14-3-3结合而阻止其与Bcl-XL结合起始凋亡。此外,AKT能抑制蛋白水解酶caspase-9的活性而阻止凋亡级联反应的激活。肿瘤抑制因子p53为一转录因子,调控凋亡、DNA修复和细胞周期的停滞。Akt能通过磷酸化P53结合蛋白MDM2影响P53的活性, 磷酸化的MDM2转位到细胞核与P53结合, 通过增加P53蛋白的降解而影响细胞存活。Forkhead转录因子FOXO1( 或FKHR)调节涉及多种细胞功能基因的表达,包括凋亡、DNA修复和细胞周期的停滞和葡萄糖代谢等,AKT磷酸化FOXO1,抑制其核转位而阻止其转录激活作用。

 

Figure 2. Some targets and processes affected by activated AKT
 
PTEN: 一个关键磷酸酶
PTEN (phosphatase and tensin homology deleted on chromosome 10), 在多种肿瘤中发生基因突变或缺失。PTEN是一个PIP3-磷酸酶,与PI3K的功能相反,它可以通过去磷酸化将PIP3转变为PI-4,5-P2。PTEN可减少AKT的活化而阻止所有由AKT调控的下游信号传导事件。通过产生PIP2, PTEN的功能远不止仅仅阻止AKT的作用。PIP2作为磷脂酶Cβ(PLCβ)的底物,产生DAG和IP3作为第二信使,升高胞内钙离子的水平并激活蛋白激酶C(PKC)。与膜结合的PIP2也能介导(增加)多种离子通道的活性,包括钙离子、钾离子和钠离子通道。PIP也参与到膜泡的形成以及细胞骨架与膜的相互作用过程中。PIP2还影响多种参与脂代谢的酶活性,包括磷脂酶D和神经酰胺-1-磷酸。通过从PIP产生PIP2, PTEN广泛的影响着细胞的多种功能途径。PTEN在减弱PIP3信号传导而增加PIP2水平的过程中,发挥着重要的作用。
 

Figure 3. Dephosphorylation of PIP3 by PTEN


参考文献
● Assinder, S.J., Dong, Q., Kovacevic, Z., and Richardson, D.R. Biochem. J. 417, 411-421 (2009).
● Yuan, T.L. and Cantley, L.C. Oncogene 27, 5497-5510 (2008).
● Wang, X. and Jiang, X. Oncogene 27, 5454-5463 (2008).
● Endersby, R. and Baker, S.J. Oncogene 27, 5416-5430 (2008).
● Carracedo, A. and Pandolfi, P.P. Oncogene 27, 5527-5541 (2008).

PI3K研究相关产品
 检测试剂盒
 Cayman
 10505
 Kinase Screening Library (96-Well)
 BioVision
 K706-400 
 PhosphoSeek™ P I3-Kinase Fluorometric Assay Kit  
 AXXORA
 GYR-GK004B
 Phosphatidylinositol 3 Kinase (PI3K) ActivityAssayBase Kit
 AXXORA
 GYR-GK004
 Phosphatidylinositol 3 Kinase (PI3K) Activity Assay Kit
 Millipore
 17-493
 PI3 Kinase Activity/Inhibitor ELISA
 
抑制剂
 Cayman
 10010177
PI3-Kinase α Inhibitor 2
 Cayman
 15279
CAL-101
 Cayman
 70920
LY294002
 Cayman
 11589
IC-87114
 Cayman
 11600
GDC 0941
 Cayman
 10009052
AS-252424
 Cayman
 9000980
AS-605240 (potassium salt)
 Cayman
 10010591
Wortmannin
 Cayman
 13242
3-Methyladenine
 ENZO
 BML-P311
PI3K SH3 domain binding peptide
 ENZO
 BML-ST425
PI3K-SH2-OMT 
 ENZO
 BML-AP502
3-Methyladenine 
 ENZO
 ALX-151-026
N-Acetyl-Asp-Tyr(2-malonyl)-Val-Pro-Met-Leu-NH2
 ENZO
 ALX-151-027
N-Acetyl-Asp-Tyr(PO3H2)-Val-Pro-Met-Leu-NH2 
 ENZO
 BML-EI390
AS-041164 
 ENZO
 ALX-270-465
AS-252424R
 ENZO
 ALX-270-461
AS-604850 
 ENZO
 ALX-270-455
Compound 15e 
 ENZO
 BML-ST420
LY 294002 
 ENZO
 BML-P305
SOS-1 (human) (1149-1158) 
 ENZO
 ALX-270-464
TGX-221 
 ENZO
 BML-ST415
Wortmannin  
 BioVision
 K856-5 
DiscoveryPak™ PI 3-Kinase Inhibitor Set  
 BioVision
 K857-11
PathwayReady™ PI3-K/Akt/mTOR Signaling Inhibitor Panel  
 AXXORA
 BML-P311-0001
PI3K SH3 domain binding peptide
 
 抗体
 ENZO
 ADI-KAM-PI200
 PI3 kinase, mAb (AB6) 
 ENZO
 ALX-210-747
 Phosphoinositide 3-kinase p110δ(human),pAb 
 GeneTex
 GTX50858
 PI3K P85 (phospho Tyr467) antibody
 GeneTex
 GTX59597
 PI3K beta antibody, C-term
 GeneTex
 GTX59596
 PI3K beta antibody, N-term
 GeneTex
 GTX111173
 PI3 kinase p110 beta antibody [N3C2],Internal
 GeneTex
 GTX300032 
 PI3K-AKT pathway Antibody Panel
 GeneTex
 GTX100462
 PI3 kinase p110 alpha antibody
 GeneTex
 GTX104639
 PI3 kinase p110 gamma antibody [C3], C-term
 GeneTex
 GTX60565
 PIK3CA antibody [4F3]
 GeneTex
 GTX61208
 PI3-kinase p110 subunit delta antibody [Y387]                                           
 GeneTex
 GTX89900
 PIK3CG antibody, C-term
 GeneTex
 GTX81224
 PIK3R1 antibody, Y580
 GeneTex
 GTX20253
 PI3 Kinase p55 gamma antibody [V2]
 BioVision
 3146-100
 PI3Kβ Antibody  
 BioVision
 3152-100 
 PI3Kβ Antibody 
 AXXORA
 ASB-ARP32117
 PIK3CB antibody - C-terminal region
 
 (重组)蛋白
 ENZO
 LX-201-119  Phosphoinositide 3-kinase p110α/p85(bovine (recombinant)
 ENZO
 ALX-201-055
 Phosphoinositide 3-kinase p110γ (human), (recombinant)
 ENZO
 BML-SE436
 PI3 kinase p110α/p85α (human),(recombinant)
 BioVision
 7766-5
 PI3K (p85⍺) Protein  
 BioVision
 3959BP-50 
 PI3K Blocking Peptide  
 AXXORA
 BV-7766
 PI3K (p85 alpha) Protein
 AXXORA
 ALX-201-119-C005
 Phosphoinositide 3-kinase p110α/p85(bovine) (recombinant)
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  88. /www/new_annoron/vendor/topthink/framework/src/think/contract/CacheHandlerInterface.php ( 1.99 KB )
  89. /www/new_annoron/app/Request.php ( 0.09 KB )
  90. /www/new_annoron/vendor/topthink/framework/src/think/Request.php ( 55.78 KB )
  91. /www/new_annoron/app/middleware.php ( 0.26 KB )
  92. /www/new_annoron/vendor/topthink/framework/src/think/Pipeline.php ( 2.61 KB )
  93. /www/new_annoron/vendor/topthink/think-trace/src/TraceDebug.php ( 3.40 KB )
  94. /www/new_annoron/vendor/topthink/framework/src/think/Route.php ( 23.73 KB )
  95. /www/new_annoron/vendor/topthink/framework/src/think/route/RuleName.php ( 5.75 KB )
  96. /www/new_annoron/vendor/topthink/framework/src/think/route/Domain.php ( 2.53 KB )
  97. /www/new_annoron/vendor/topthink/framework/src/think/route/RuleGroup.php ( 22.43 KB )
  98. /www/new_annoron/vendor/topthink/framework/src/think/route/Rule.php ( 26.95 KB )
  99. /www/new_annoron/vendor/topthink/framework/src/think/route/RuleItem.php ( 9.78 KB )
  100. /www/new_annoron/route/app.php ( 1.26 KB )
  101. /www/new_annoron/vendor/topthink/framework/src/think/facade/Route.php ( 4.70 KB )
  102. /www/new_annoron/vendor/topthink/framework/src/think/route/dispatch/Controller.php ( 4.74 KB )
  103. /www/new_annoron/vendor/topthink/framework/src/think/route/Dispatch.php ( 10.44 KB )
  104. /www/new_annoron/app/controller/News.php ( 8.00 KB )
  105. /www/new_annoron/app/BaseController.php ( 2.05 KB )
  106. /www/new_annoron/vendor/topthink/framework/src/think/facade/View.php ( 1.70 KB )
  107. /www/new_annoron/app/controller/Index.php ( 8.51 KB )
  108. /www/new_annoron/vendor/topthink/framework/src/think/View.php ( 4.39 KB )
  109. /www/new_annoron/vendor/topthink/think-orm/src/facade/Db.php ( 0.93 KB )
  110. /www/new_annoron/vendor/topthink/think-orm/src/db/connector/Mysql.php ( 5.44 KB )
  111. /www/new_annoron/vendor/topthink/think-orm/src/db/PDOConnection.php ( 52.47 KB )
  112. /www/new_annoron/vendor/topthink/think-orm/src/db/Connection.php ( 8.39 KB )
  113. /www/new_annoron/vendor/topthink/think-orm/src/db/ConnectionInterface.php ( 4.57 KB )
  114. /www/new_annoron/vendor/topthink/think-orm/src/db/builder/Mysql.php ( 16.58 KB )
  115. /www/new_annoron/vendor/topthink/think-orm/src/db/Builder.php ( 24.06 KB )
  116. /www/new_annoron/vendor/topthink/think-orm/src/db/BaseBuilder.php ( 27.50 KB )
  117. /www/new_annoron/vendor/topthink/think-orm/src/db/Query.php ( 15.71 KB )
  118. /www/new_annoron/vendor/topthink/think-orm/src/db/BaseQuery.php ( 45.13 KB )
  119. /www/new_annoron/vendor/topthink/think-orm/src/db/concern/TimeFieldQuery.php ( 7.43 KB )
  120. /www/new_annoron/vendor/topthink/think-orm/src/db/concern/AggregateQuery.php ( 3.26 KB )
  121. /www/new_annoron/vendor/topthink/think-orm/src/db/concern/ModelRelationQuery.php ( 20.07 KB )
  122. /www/new_annoron/vendor/topthink/think-orm/src/db/concern/ParamsBind.php ( 3.66 KB )
  123. /www/new_annoron/vendor/topthink/think-orm/src/db/concern/ResultOperation.php ( 7.01 KB )
  124. /www/new_annoron/vendor/topthink/think-orm/src/db/concern/WhereQuery.php ( 19.37 KB )
  125. /www/new_annoron/vendor/topthink/think-orm/src/db/concern/JoinAndViewQuery.php ( 7.11 KB )
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  130. /www/new_annoron/vendor/topthink/framework/src/think/log/Channel.php ( 3.89 KB )
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  133. /www/new_annoron/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
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  139. /www/new_annoron/vendor/topthink/framework/src/think/Response.php ( 8.81 KB )
  140. /www/new_annoron/vendor/topthink/framework/src/think/response/Html.php ( 0.97 KB )
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  1. CONNECT:[ UseTime:0.000417s ] mysql:host=127.0.0.1;port=3306;dbname=www_annoron_com;charset=utf8
  2. SHOW FULL COLUMNS FROM `ecs_article` [ RunTime:0.000742s ]
  3. SELECT * FROM `ecs_article` WHERE `article_id` = 162 LIMIT 1 [ RunTime:0.000527s ]
  4. SHOW FULL COLUMNS FROM `ecs_article_cat` [ RunTime:0.000852s ]
  5. SELECT * FROM `ecs_article_cat` WHERE `cat_id` = 5 LIMIT 1 [ RunTime:0.000269s ]
  6. SELECT * FROM `ecs_article_cat` WHERE `parent_id` = 11 [ RunTime:0.000200s ]
0.030897s