A DAILY CYCLE OF APOCRINE SECRETION BY THE B-CELLS IN THE HEPATOPANCREAS OF TERRESTRIAL ISOPODS
A DAILY CYCLE OF APOCRINE SECRETION BY THE B-CELLS IN THE HEPATOPANCREAS OF TERRESTRIAL ISOPODS
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DOI：
10.1139/z91-267
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发表时间：
1991-07-01
期刊：
影响因子：
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通讯作者：
HOPKIN, SP
中科院分区：
文献类型：
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作者：
HAMES, CAC;HOPKIN, SP
两种细胞类型的肝胰腺的陆生等足类Oniscus asellus和Porcellio scaber的超微结构进行了检查，在每小时的时间间隔在动物习惯于16小时的光：8小时的黑暗周期。B细胞的超微结构发生实质性变化，每24 h重复一次。这种“B细胞周期”可分为两个阶段。在第一，“挤出”阶段，开始前约1小时的光周期的开始，顶端的B细胞的内容物的核被排空到肝胰腺的内腔。第二个阶段是“恢复期”，大约在光周期开始后10小时开始。B细胞由于新物质的积累而体积膨胀，直到下一个挤出阶段。的S细胞的超微结构外观是相似的，在所有阶段的日常和换羽周期，他们从来没有观察到任何材料进入肝胰腺腔的空隙。S和B细胞的内容物的周转率之间的差异有重要的意义，了解陆生等足类动物中的金属污染物的积累和损失的动态。
The ultrastructure of the two cell types of the hepatopancreas of the terrestrial isopods Oniscus asellus and Porcellio scaber was examined at hourly intervals in animals habituated to a 16 h light: 8 h dark cycle. The ultrastructure of the B cells undergoes substantial changes which are repeated every 24 h. This 'B cell cycle' can be divided into two stages. During the first, 'extrusive' stage, which begins about 1 h before the onset of the light period, the contents of the B cells apical to the nuclei are voided into the lumen of the hepatopancreas. The second, 'restitutive,' stage begins about 10 h after the onset of the light cycle. The B cells swell in size by the accumulation of the new material until the next extrusive stage. The ultrastructural appearance of the S cells was similar at all stages of the daily and moult cycles; they were never observed to void any material into the lumen of the hepatopancreas. The differences between the rates of turnover of the contents of the S and B cells have important implications for understanding the dynamics of accumulation and loss of metal pollutants in terrestrial isopods.