Mitogenesis in response to PDGF and bombesin abolished by microinjection of antibody to PIP2.

Mitogenesis in response to PDGF and bombesin abolished by microinjection of antibody to PIP2.
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显微注射 PIP2 抗体可消除 PDGF 和铃蟾肽响应的有丝分裂。

DOI:
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发表时间:
1988
期刊:
影响因子:
56.9
通讯作者:
T. Takenawa
T. Takenawa
中科院分区:
综合性期刊1区
文献类型:
--
作者:
K. Matuoka;K. Fukami;O. Nakanishi;S. Kawai;T. Takenawa

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磷脂酰肌醇4,5-二磷酸(PIP2)的周转被认为是包括丝裂原在内的多种生物活性物质刺激细胞的信号通路中的关键一步,但这一观点尚未获得决定性的证据。在本研究中,将抗PIP2的单抗显微注射到NIH3T3细胞的细胞质中,在有丝分裂原刺激前后。该抗体完全消除了由血小板衍生生长因子和蛙皮素诱导的[~3H]胸腺嘧啶核苷的核标记,但不能被成纤维细胞生长因子、表皮生长因子、胰岛素或血清诱导。这些发现有力地表明,PIP2的破坏在某些类型的有丝分裂原如血小板衍生生长因子和蛙皮素诱导的细胞增殖的诱导和维持中起着至关重要的作用。
The turnover of phosphatidylinositol 4,5-bisphosphate (PIP2) is believed to constitute a crucial step in the signaling pathways for stimulation of cells by a variety of bioactive substances, including mitogens, but decisive evidence for the idea has not been obtained. In the present study, a monoclonal antibody to PIP2 was microinjected into the cytoplasm of NIH 3T3 cells before or after exposure to mitogens. The antibody completely abolished nuclear labeling with [3H]thymidine induced by platelet-derived growth factor and bombesin, but not by fibroblast growth factor, epidermal growth factor, insulin, or serum. The findings strongly suggest that PIP2 breakdown is crucial in the elicitation and sustaining of cell proliferation induced by some types of mitogens such as platelet-derived growth factor and bombesin.
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DOI: --
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