Calcium restriction prolongs metaphase in dividing Tradescantia stamen hair cells.
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چکیده
منابع مشابه
Calcium restriction prolongs metaphase in dividing Tradescantia stamen hair cells
Agents that lower extracellular calcium concentration (EGTA) or modulate calcium transport (lanthanum or D600) have been applied to dividing stamen hair cells of Tradescantia and analyzed for their ability to change the following: (a) the time required to progress from nuclear envelope breakdown to the onset of anaphase (metaphase transit time), (b) the time required to progress from anaphase t...
متن کاملFree calcium increases during anaphase in stamen hair cells of Tradescantia
Changes in free calcium concentration [( Ca]) have been detected during anaphase in stamen hair cells of Tradescantia. Cells have been injected iontophoretically with the calcium sensitive metallochromic dye arsenazo III and changes in differential absorbance have been measured using a spinning wheel microspectrophotometer. The results obtained on single cells progressing from midmetaphase thro...
متن کاملRegulation of anaphase chromosome motion in Tradescantia stamen hair cells by calcium and related signaling agents
Several lines of evidence support the idea that increases in the intracellular free calcium concentration [( Ca2+]i) regulate chromosome motion. To directly test this we have iontophoretically injected Ca2+ or related signaling agents into Tradescantia stamen hair cells during anaphase and measured their effect on chromosome motion and on the Ca2+ levels. Ca2+ at (+)1 nA for 10 s (approximately...
متن کاملNeomycin reversibly disrupts mitotic progression in stamen hair cells of Tradescantia
Neomycin has been reported to inhibit polyphosphoinositide cycling by preventing the hydrolysis of phosphatidylinositol 4,5-bisphosphate into inositol 1,4,5-trisphosphate and 1,2-diacylglycerol. Inositol 1,4,5-trisphosphate, through the mobilization of calcium, and 1,2-diacylglycerol, through the activation of protein kinase C, trigger many physiological responses. The addition of 2 mM neomycin...
متن کاملChanges in the metaphase transit times and the pattern of sister chromatid separation in stamen hair cells of Tradescantia after treatment with protein phosphatase inhibitors.
Stamen hair cells from the spiderwort plant, Tradescantia virginiana, exhibit remarkably predictable metaphase transit times, making them uniquely suitable for temporal studies on mitotic regulation. In this study, we describe two kinds of experiments that test whether protein phosphatase activity is a necessary prerequisite for entry into anaphase in living, mitotic cells. We treated cells at ...
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ژورنال
عنوان ژورنال: The Journal of Cell Biology
سال: 1985
ISSN: 0021-9525,1540-8140
DOI: 10.1083/jcb.100.5.1363