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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >POLAR CYTOPLASMIC EVAGINATIONS IN DIVIDING SPERMATOCYTES OF THE FIREBUG, PYRRHOCORIS APTERUS (PYRRHOCORIDAE, HEMIPTERA)
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POLAR CYTOPLASMIC EVAGINATIONS IN DIVIDING SPERMATOCYTES OF THE FIREBUG, PYRRHOCORIS APTERUS (PYRRHOCORIDAE, HEMIPTERA)

机译：划分火棘，斑节杆菌（Pyrrhocorisapterus，Pyrrhocorrisae，Hemiptera）的精子细胞的极性细胞质评价

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The present fine structure and anti-tubulin immunofluorescence study deals with evaginations from the cell surface in metaphase I spermatocytes of the firebug Pyrrhocoris apterus (Pyrrhocoridae, hemiptera). The surface of spermatogonia and prophase spermatocytes was smooth throughout. Only in metaphase I and anaphase I, cytoplasmic threads projected from polar portions of the spermatocytes. In contrast, equatorial portions of these cells possessed a smooth surface. By mid to late telophase, the evaginations were no longer detectable in spermatocytes. Three ideas are at hand to explain the development of polar cytoplasmic evaginations. First, they could represent a membrane reserve used up during spindle elongation in telophase of meiosis. In order to test this idea, spindle structure was analyzed in meiosis I using simultaneously antibodies to beta-tubulin and gamma-tubulin, gamma-Tubulin represents a tubulin isoform prevalent in centrosomes. The observations showed that spindle elongation was not very prominent in meiosis of the bug. Although it cannot be ruled out, the formation of a polar membrane reserve prior to spindle elongation is not a likely explanation for the evaginations from the cell surface. Second, the development of surface extensions could bring about increased exchange of metabolites during a particulaly active stage of meiosis. Third; the polar evaginations could be an inadvertent product of the aster microtubules protruding towards the plasma membrane. [References: 24]
机译：目前的精细结构和抗微管蛋白免疫荧光研究涉及萤火虫斑节菌（Pyrrhocoris apterus，Pyrrhocoris apterus）（Pyrrhocoridae，hemipptera）的中期I精母细胞从细胞表面的逃逸。精原细胞和前期精母细胞的表面光滑。仅在中期I和后期I中，胞浆线从精细胞的极性部分突出。相反，这些细胞的赤道部分具有​​光滑的表面。到末期中期至晚期，在精母细胞中不再可检测到外翻。提出了三种思路来解释极性细胞质逃逸的发展。首先，它们可以代表减数分裂末期纺锤体伸长过程中用完的膜储备。为了检验这个想法，在减数分裂I中同时使用了针对β-微管蛋白和γ-微管蛋白的抗体对纺锤体结构进行了分析，γ-微管蛋白代表在中心体中普遍存在的微管蛋白同种型。观察表明，在虫的减数分裂中纺锤体的伸长不是很明显。尽管不能排除，但是在纺锤体伸长之前形成极性膜储备并不是从细胞表面逸出的可能解释。其次，在减数分裂特别活跃的阶段，表面延伸的发展可能导致代谢物交换增加。第三;极性的疏散可能是疏松的微管向质膜突出的产物。 [参考：24]

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