Tsuneki K, Kobayashi H, Pang P K
Cell Tissue Res. 1984;238(2):307-12. doi: 10.1007/BF00217302.
The fine structure of the collecting tubules of the trout and killifish kidney was studied. These tubules are surrounded by layers of smooth muscle cells which are commonly innervated. The nerve terminals contain synaptic vesicles and, occasionally, a few dense-cored granules as well. Capillaries occur in the connective tissue space between these smooth muscle cells and the collecting tubule. Epithelial cells of the collecting tubules contain abundant mitochondria and a well developed membrane system displaying parallel arrays, and were considered to be actively involved in the transport of materials. In the trout, the collecting tubules contain peculiar cells in addition to regular tubule cells. The fine structure of these peculiar cells is highly reminiscent of that of gill chloride cells. The significance of these findings may be summarized as follows: If the smooth muscles around the collecting tubule contract under neural influence, intratubular pressure may be increased and, thus affect glomerular filtration rate. The contraction of these muscles may also cause the collapse of peritubular capillaries, affecting the transport activity of tubule cells.
对鳟鱼和鳉鱼肾脏集合小管的精细结构进行了研究。这些小管被通常有神经支配的平滑肌细胞层包围。神经末梢含有突触小泡，偶尔还含有一些致密核心颗粒。毛细血管出现在这些平滑肌细胞和集合小管之间的结缔组织间隙中。集合小管的上皮细胞含有丰富的线粒体和发育良好的呈平行排列的膜系统，被认为积极参与物质运输。在鳟鱼中，集合小管除了常规的小管细胞外还含有特殊细胞。这些特殊细胞的精细结构与鳃氯细胞的结构非常相似。这些发现的意义可总结如下：如果集合小管周围的平滑肌在神经影响下收缩，管内压力可能会升高，从而影响肾小球滤过率。这些肌肉的收缩也可能导致肾小管周围毛细血管塌陷，影响小管细胞的运输活性。
