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Journal of Cell Science, Vol 110, Issue 19 2391-2401, Copyright © 1997 by Company of Biologists
JOURNAL ARTICLES |
AM Yvon and P Wadsworth
Program in Molecular and Cellular Biology, University of Massachusetts, Amherst 01003, USA.
Experiments performed on a cell line (A498) derived from a human kidney carcinoma revealed non-centrosomal microtubules in the peripheral lamella of many cells. These short microtubules were observed in glutaraldehyde-fixed cells by indirect immunofluorescence, and in live cells injected with rhodamine-labeled tubulin. The non-centrosomal microtubules were observed to form de novo in living cells, and their complete disassembly was also observed. Low-light-level fluorescence microscopy, coupled to imaging software, was utilized to record and measure the dynamic behavior of both ends of the non-centrosomal microtubules in these cells. For each, the plus end was differentiated from the minus end using the ratio of their transition frequencies and by measuring total assembly at each end. For comparative purposes, dynamics of the plus ends of centrosomally nucleated microtubules were also analyzed in this cell line. Our data reveal several striking differences between the plus and minus ends. The average pause duration was nearly 4-fold higher at the minus ends; the percentage of time spent in pause was 92% at the minus ends, compared to 55% at plus ends. Dynamicity was decreased 4-fold at the minus ends, and the average number of events per minute was reduced from 7.0 at the plus end to 1.5 at the minus ends. The minus ends also showed a 6-fold decrease in frequency of catastrophe over the plus ends. These data demonstrate that in living cells, microtubules can form at sites distant from the perinuclear microtubule organizing center, and once formed, non-centrosomal microtubules can persist for relatively long periods.
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