Taxol induces microtubule-rough endoplasmic reticulum complexes and microtubule-bundles in cultured chondroblasts.

Taxol induces microtubule-rough endoplasmic reticulum complexes and microtubule-bundles in cultured chondroblasts.
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紫杉醇在培养的成软骨细胞中诱导微管-粗面内质网复合物和微管束。

DOI:
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发表时间:
1983
期刊:
Differentiation; research in biological diversity
影响因子:
--
通讯作者:
H. Holtzer
H. Holtzer
中科院分区:
--
文献类型:
--
作者:
S. Tokunaka;T. Friedman;Y. Toyama;M. Pacifici;H. Holtzer

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紫杉醇诱导功能性成软骨细胞中微管(MT)数量的大量增加。该药物还诱导MT分布的显著变化。在对照培养物中,抗微管蛋白染色从核周中心辐射的长的、细的、弯曲的细丝。在紫杉醇处理过的细胞中,抗微管蛋白染色的是呈显著对足分布的细长、直的人字形结构。这样的MT-束是相对稳定的:它们在去除紫杉醇后持续超过48小时,甚至在秋水仙胺中持续16-24小时。这些多余的MT中的许多结合到粗面内质网(RER)的胞质面并在其上排列。在结合过程中,MT取代了许多通常镶嵌在粗面内质网池表面的核糖体。结合的MT形成了一个非常均匀的层,中心间距为40纳米。附着的MT的平行阵列实现超过10微米的长度。这些结合的MT不仅从RER表面驱逐核糖体,而且它们还将相邻的ER复合物压缩在一起,形成2到8层的池。还诱导了许多六边形有序MT的细胞质束。当紧密对齐时,MT呈现具有六重对称性的结晶构型,中心MT被六个等距MT包围。单个小区可以具有超过100个MT束,并且每个束的MT数量从2-30变化。聚集细胞质MT束的力可能不同于将MT结合到RER的力。紫杉醇也能使突出的高尔基复合体破碎,而高尔基复合体的特征是成软骨细胞的分泌活跃。尚未发现这些诱导的MT与其他细胞器如中等大小的细丝、微丝、线粒体、高尔基体池或分泌囊泡之间存在明显的形态学关系。
Taxol induces a vast increase in the number of microtubules (MTs) in functional chondroblasts. The drug also induces a marked change in MT distribution. In control cultures, anti-tubulin stains long, fine, sinuous filaments radiating from a perinuclear center. In taxol-treated cells, anti-tubulin stains stubby, straight, chevron-like structures that assume a striking antipodal distribution. Such MT-bundles are relatively stable: they persist for over 48 h after removal of taxol, and even for 16-24 h in Colcemid. Many of these supernumerary MTs bind to, and align on, the cytoplasmic face of the rough endoplasmic reticulum (RER). In binding, the MTs displace the numerous ribosomes that normally stud the surface of the cisternae of the RER. The bound MTs form a remarkably uniform layer with center-to-center spacings of 40 nm. The attached parallel arrays of MTs achieve lengths of over 10 microns. These bound MTs not only dislodge ribosomes from the RER surface, but they also zip together adjacent ER complexes, forming tiers of two to eight cisternae. Numerous cytoplasmic bundles of hexagonally-ordered MTs are also induced. When closely aligned, the MTs assume a crystalline configuration with a six-fold symmetry, a central MT being surrounded by six equidistant MTs. A single cell can have over 100 MT-bundles and the number of MTs per bundles varies from 2-30. The forces aggregating cytoplasmic MT-bundles probably differ from those that bind MTs to the RER. Taxol also fragments the prominent Golgi complex that characterizes actively secreting chondroblasts. No obvious morphologic relationship has yet been detected between these induced MTs and other organelles such as intermediate-sized filaments, microfilaments, mitochondria, Golgi cisternae, or secretory vesicles.
紫杉醇和秋水酰胺对肌原纤维形成的影响。
DOI: 10.1073/pnas.79.21.6556
发表时间: 1982
影响因子: 11.1
作者:
Toyama,Y;Forry-Schaudies,S;Hoffman,B;Holtzer,H
通讯作者: Holtzer,H
中等大小的丝:肌源性和神经源性谱系细胞的合成和分布的变化。
DOI: 10.1101/sqb.1982.046.01.033
发表时间: 1982
期刊: Cold Spring Harbor symposia on quantitative biology
影响因子: --
作者:
Holtzer,H;Bennett,GS;Tapscott,SJ;Croop,JM;Toyama,Y
通讯作者: Toyama,Y
发育中的小鸡脊髓中的中间丝蛋白。
DOI: 10.1016/0012-1606(81)90313-4
发表时间: 1981
影响因子: 2.7
作者:
Tapscott,SJ;Bennett,GS;Toyama,Y;Kleinbart,F;Holtzer,H
通讯作者: Holtzer,H
DOI: --
发表时间: 1981
期刊: The Journal of biological chemistry
影响因子: --
作者:
Pacifici,M;Fellini,SA;Holtzer,H;DeLuca,S
通讯作者: DeLuca,S
DOI: --
发表时间: 1981
期刊: The Journal of biological chemistry
影响因子: --
作者:
Fellini,SA;Pacifici,M;Holtzer,H
通讯作者: Holtzer,H