Fishelson L, Becker K
Department of Zoology, Tel Aviv University, Israel.
Naturwissenschaften. 1999 Aug;86(8):400-3. doi: 10.1007/s001140050641.
Rodlet cells have been found in the head and trunk kidneys of the common carp (Cyprinus carpio L). From an experimental sample of 50 carps of various ages, we detected these cells in only seven fishes, contradicting the hypothesis that they constitute a normal component of the fish epithelia. The rodlet cells have a typical structure: 12-16 microns in diameter, with a basal nucleus various in form, and an encasing layer of fibrillar structure. The cells contain rodlets, composed of elongated, opaque sacs featuring dark rods in the center, which strongly elongate in ripening cells. Remarkable pseudopodia-like extensions from the apical parts of the rodlet cells penetrate into the delicate blood vessels and sinusoids of the organs. The encasing layer at the cell apex then opens to release the rodlets into the bloodstream. No junctions were found between the rodlet cells and neighboring cells. It is suggested that these cells comprise some kind of "symbiosis" between leukocyte, possible granulocyte cells, and the parasitic rodlets. The cells serve the rodlets as an incubation chamber, as well as a means of transportation into the bloodstream after ripening.
在鲤鱼（Cyprinus carpio L）的头肾和躯干肾中发现了小杆状细胞。在一个由50条不同年龄鲤鱼组成的实验样本中，我们仅在7条鱼中检测到了这些细胞，这与它们构成鱼类上皮正常成分的假设相矛盾。小杆状细胞具有典型的结构：直径为12 - 16微米，有一个形态各异的基底核，还有一层纤维状结构的包裹层。细胞内含有小杆状体，由细长的不透明囊泡组成，中央有深色杆状物，在成熟细胞中会强烈伸长。小杆状细胞顶端有明显的伪足样突起，可穿透器官的细小血管和血窦。细胞顶端的包裹层随后打开，将小杆状体释放到血液中。未发现小杆状细胞与相邻细胞之间有连接。有人认为，这些细胞构成了白细胞（可能是粒细胞）与寄生性小杆状体之间的某种“共生关系”。这些细胞为小杆状体提供了一个孵化室，同时也是小杆状体成熟后进入血液的一种运输方式。
