PMID: 6538204Mar 1, 1984Paper

10-nm filaments are induced to collapse in living cells microinjected with monoclonal and polyclonal antibodies against tubulin

The Journal of Cell Biology
S H BloseJ R Feramisco

Abstract

Cells were microinjected with four mouse monoclonal antibodies that were directed against either alpha- or beta-tubulin subunits, one monoclonal with activity against both subunits, and a guinea pig polyclonal antibody with activity directed against both subunits, to determine the effects on the distribution of cytoplasmic microtubules and 10-nm filaments. The specificities of the antibodies were confirmed by Western blots, solid phase radioimmunoassay, and Western blot analysis of alpha- and beta-tubulin peptide maps. Two monoclonals DM1A and DM3B3, an anti-alpha- and anti-beta-tubulin respectively, and the guinea pig polyclonal anti-alpha/beta-tubulin antibody (GP1T4) caused the 10-nm filaments to collapse into large lateral aggregates collecting in the cell periphery or tight juxtanuclear caps; the other monoclonal antibodies had no effect when microinjected into cells. The filament collapsing was observed to be complete at 1.5-2 h after injection. During the first 30 min after injection a few cytoplasmic microtubules near the cell periphery could be observed by fluorescence microscopy. This observation was confirmed by electron microscopy, which also demonstrated assembled microtubules in the juxtanuclear region. By 1.5 h, ...Continue Reading

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Citations

Jan 1, 1996·Cell Motility and the Cytoskeleton·C S Spittle, L Cassimeris
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