Regulation of natural cytotoxicity receptors by heparan sulfate proteoglycans in -cis: A lesson from NKp44.

Regulation of natural cytotoxicity receptors by heparan sulfate proteoglycans in -cis: A lesson from NKp44.
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DOI:
10.1002/eji.201445177
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发表时间:
2015-04
影响因子:
5.4
通讯作者:
Porgador, Angel
Porgador, Angel
中科院分区:
医学3区
文献类型:
--
作者:
Brusilovsky, Michael;Radinsky, Olga;Cohen, Limor;Yossef, Rami;Shemesh, Avishai;Braiman, Alex;Mandelboim, Ofer;Campbell, Kerry S.;Porgador, Angel

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NKp 44(NCR 2)是天然细胞毒性受体(NCR)家族的独特成员,其可以诱导人NK细胞中的细胞因子产生和细胞溶解活性。硫酸乙酰肝素蛋白聚糖(HSPG)在各种正常和癌组织中差异表达。据报道,HSPG用作NKp 44和其他NCR的配体/共配体。然而,HSPG表达并不局限于任何一组,也可以在NK细胞中发现。我们的研究表明,NKp 44的功能是通过与NK细胞表面的HSPG相互作用而不是通过与靶细胞表面的HSPG相互作用来调节的,NKp 44与NK细胞相关的HSPG syndecan-4(SDC 4)的紧密相互作用可以直接调节NKp 44的膜分布,从而抑制NKp 44受体的触发。我们进一步证明,NKp 44和SDC 4相互作用的破坏释放受体与其配体反式接合,因此增强NKp 44活化潜力和NK细胞功能应答。
NKp44 (NCR2) is a distinct member of Natural Cytotoxicity Receptors (NCRs) family that can induce cytokine production and cytolytic activity in human NK cells. Heparan sulfate proteoglycans (HSPGs) are differentially expressed in various normal and cancerous tissues. HSPGs were reported to serve as ligands/co-ligands for NKp44 and other NCRs. However, HSPG expression is not restricted to either group and can be found also in NK cells. Our current study reveals that NKp44 function can be modulated through interactions with HSPGs on NK cells themselves in -cis rather than on target cells in -trans. The intimate interaction of NKp44 and the NK cell-associated HSPG syndecan-4 (SDC4) in –cis can directly regulate membrane distribution of NKp44 and constitutively dampens the triggering of the receptor. We further demonstrate, that the disruption of NKp44 and SDC4 interaction releases the receptor to engage with its ligands in –trans and therefore enhances NKp44 activation potential and NK cell functional response.
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