Distribution and Characteristics of βII Tubulin-Enriched Microtubules in Interphase Cells |
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Authors: | Rosario Armas-Portela Maria A Parrales Juan P Albar Carlos Martinez-A Jesús Avila |
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Institution: | aCentro de Biologı́a Molecular “Severo Ochoa” (CSIC-UAM), Centro Nacional de Biotecnologia, CSIC, Universidad Autónoma de Madrid, E-28049, Madrid, Spain;bDepartamento de Biologı́a, Facultad de Ciencias, Centro Nacional de Biotecnologia, CSIC, Universidad Autónoma de Madrid, E-28049, Madrid, Spain;cDepartment of Immunology and Oncology, Centro Nacional de Biotecnologia, CSIC, Universidad Autónoma de Madrid, E-28049, Madrid, Spain |
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Abstract: | We have used a polyclonal antibody (Ab196) that specifically recognizes the βII tubulin isotype to examine the subcellular distribution and properties of microtubules enriched in this isotype. Antibody specificity was tested by a method that involves the analysis of its interaction with individual β isotypes. Using photoimaging analysis, we observed βII tubulin-enriched microtubules in the perinuclear region, as well as in the microtubules close to the periphery of interphase cells. The observed sorting of βII-enriched microtubules together with the reported increased levels of βII tubulin in taxol-resistant cells (M. Haberet al.,1995,J. Biol. Chem.270, 31269–31275) prompted us to study the behavior of microtubules enriched in this isotype after different depolymerizing treatments. After cold or nocodazol treatments, βII-enriched microtubules anchored at the centrosome and at the cell periphery were observed. In addition, cold-resistant microtubules were marked mainly by the specific anti-βII tubulin antibody but not by anti-acetylated α tubulin, suggesting the presence of different stable microtubule subsets enriched in particular tubulin isoforms. |
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Keywords: | β II tubulin microtubule cold-stability microtubule depolymerizing drug resistance |
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