The Activation State of the Integrin Affects Outside-in Signals Leading to Cell Spreading and Focal Adhesion Kinase Phosphorylation (*)

The Activation State of the Integrin Affects Outside-in Signals Leading to Cell Spreading and Focal Adhesion Kinase Phosphorylation (*)
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整合素的激活状态影响由外而内的信号,导致细胞扩散和局部粘附激酶磷酸化 (*)

DOI:
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发表时间:
1995
影响因子:
4.8
通讯作者:
V. Quaranta
V. Quaranta
中科院分区:
生物学2区
文献类型:
--
作者:
A. Pelletier;T. Kunicki;Z. Ruggeri;V. Quaranta

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整合素与细胞外基质结合并传递信号,介导细胞黏附、扩散和迁移。目前还不清楚这些不同的反应是如何伴随着一个共同的事件:整合素聚集。我们利用一株表达αβ3的细胞株(克隆体B)和一组针对该整合素的单抗,研究了整合素介导的信号与整合素的激活状态之间的关系。用于聚集αβ3刺激的粘着斑激酶(FAK)磷酸化的非激活抗体,与亲和力、亚基专一性或配体阻断表型无关。这些抗体包裹在塑料上,支持细胞黏附、扩散和FAK磷酸化。相反,激活的抗体诱导的αβ3的聚集,或可溶性纤维蛋白原与抗体激活的αβ3的结合,都不会诱导FAK的磷酸化。因此,克隆B上的αβ3簇并不一定导致FAK磷酸化。包被在塑料上的激活抗体支持细胞黏附,但不能扩散或FAK磷酸化。这些数据表明,“内向外”信号不仅可能改变整合素的结合专一性,而且还可能改变整合素启动的“由外向内”的生化信号。这种激活状态相关的信号代表了一种新的机制,可以解释整合素-基质相互作用是如何诱导不同的细胞反应的。
Integrins bind extracellular matrix and transduce signals mediating cell adhesion, spreading, and migration. It is unclear how these distinct responses follow from a common event: integrin clustering. We examined the relationship between integrin-mediated signals and the integrin's activation state using a cell line expressing αβ3 (Clone B) and a panel of monoclonal antibodies against this integrin. Nonactivating antibodies used to cluster αβ3 stimulated focal adhesion kinase (FAK) phosphorylation, regardless of affinity, subunit specificity, or ligand-blocking phenotype. Coated on plastic, these antibodies supported cell adhesion, spreading, and FAK phosphorylation. In contrast, clustering of αβ3 induced with activating antibodies, or binding of soluble fibrinogen to antibody-activated αβ3, did not induce FAK phosphorylation. Thus, clustering of αβ3 on Clone B does not necessarily result in FAK phosphorylation. Coated on plastic, activating antibodies supported cell adhesion, but not spreading or FAK phosphorylation. Therefore, it appears the resting, not the active form of αβ3, induces cell spreading and FAK phosphorylation in Clone B. These data indicate that “inside-out” signals may alter not only the binding specificity of an integrin, but the “outside-in” biochemical signals that integrin initiates as well. This activation state-linked signaling represents a novel mechanism, which may explain how diverse cellular responses are induced by integrin-matrix interactions.
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
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DOI: --
发表时间: 1990
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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通讯作者: Edgington,TS
DOI: --
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期刊: Blood
影响因子: 20.3
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DOI: --
发表时间: 1993
期刊: Cancer research
影响因子: 11.2
作者:
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通讯作者: Schwartz,MA
DOI: 10.1073/pnas.88.19.8392
发表时间: 1991-10-01
影响因子: 11.1
作者:
KORNBERG, LJ;EARP, HS;JULIANO, RL
通讯作者: JULIANO, RL