{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,7]],"date-time":"2026-02-07T14:47:27Z","timestamp":1770475647270,"version":"3.49.0"},"reference-count":39,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,2,4]],"date-time":"2005-02-04T00:00:00Z","timestamp":1107475200000},"content-version":"vor","delay-in-days":9045,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal Cellular Physiology"],"published-print":{"date-parts":[[1980,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Cytoplasmic calcium levels are believed to be important in blood platelet activation. Upon activation, the discrete marginal microtubule band, which maintains the discoid shape of non\u2010activated platelets, becomes disrupted. Present studies demonstrate that the extent of assembly of the marginal microtubule band is related to cytoplasmic calcium levels. The divalent cationophore, A23187, causes platelet aggregation, secretion, and contraction by promoting calcium transport from intraplatelet storage sites into the cytoplasm. A23187 caused disassembly of platelet microtubules. Quantitation of electron micrographs revealed that numbers of microtubules were reduced by approximately 80% after A23187 treatment. Secondly, assembled microtubules in homogenates of platelets, in which microtubules were stabilized prior to homogenization, were decreased in favor of free tubulin in A23187\u2010treated platelets. Thirdly, A23187 increased <jats:sup>14<\/jats:sup>C\u2010colchicine binding by intact platelets; this also indicated a shift in the microtubule subunit equilibrium to favor free, colchicine\u2010binding tubulin subunits. In control experiments, A23187 did not affect the stability of platelet tubulin, the colchicine binding reaction, or the total tubulin content of platelets. Stimulation of colchicine binding depended on A23187 concentration (0.05\u20130.5 \u03bcM) and did not require extracellular calcium. A23187\u2010stimulation of colchicine binding was blocked by dibutyryl cyclic AMP (0.80 mM) and\/or 3\u2010isobutyl\u20101\u2010methylxanthine (50 \u03bcM) and by indomethacin (10 \u03bcM). Cyclic AMP or indomethacin also interferes with A23187\u2010induced platelet activation, but indomethacin is not likely to completely inhibit the perturbation of intraplatelet calcium gradients by A23187. It is suggested that A23187\u2010induced microtubule disassembly may be an indirect effect of calcium on microtubules.<\/jats:p>","DOI":"10.1002\/jcp.1041030214","type":"journal-article","created":{"date-parts":[[2005,2,26]],"date-time":"2005-02-26T16:26:21Z","timestamp":1109435181000},"page":"289-298","source":"Crossref","is-referenced-by-count":17,"title":["Ionophore\u2010induced disassembly of blood platelet microtubules: Effect of cyclic AMP and indomethacin"],"prefix":"10.1002","volume":"103","author":[{"given":"Dianne M.","family":"Kenney","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Francis C.","family":"Chao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,2,4]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/bi00732a002"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0003-2697(72)90046-2"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1242\/jcs.20.3.569"},{"key":"e_1_2_1_5_1","first-page":"229","volume-title":"Microtubules and Microtubule Inhibitors","author":"Crawford N.","year":"1975"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.71.3.735"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/268060a0"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/249172a0"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/0049-3848(75)90113-9"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1085\/jgp.66.5.561"},{"key":"e_1_2_1_11_1","first-page":"379","volume-title":"Microtubules and Microtubule Inhibitors","author":"Fuller G. 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