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首页> 外文期刊>Endocrine Research >The morpho-anatomy and histology of the pineal complex in a major Indian carp, Catla catla: identification of the pineal photoreceptor cells and their responsiveness to constant light and constant darkness during different phases of the annual reprod
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The morpho-anatomy and histology of the pineal complex in a major Indian carp, Catla catla: identification of the pineal photoreceptor cells and their responsiveness to constant light and constant darkness during different phases of the annual reprod

机译：主要印度鲤鱼Catla catla中松果体复合物的形态解剖学和组织学：识别松果体感光细胞及其对一年生生殖不同阶段中持续不断的光照和持续黑暗的响应

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摘要

In contrast to mammals in which the pineal gland is a discrete structure situated dorsally in the brain, the "pineal gland" in teleost fishes is composed of a number of separate but connected constituent parts, collectively described as the "pineal complex." In this paper, we have described the pineal complex in a common Indian carp, Catla catla, which exhibits an annual reproductive cycle. Attempts have been made to (a) provide an in-depth description of the structure of the pineal complex; and (b) identify the photoreceptor cells of the pineal, by exposing the animals to constant light (LL) and constant darkness (DD). Furthermore, we examined any possible influence of the reproductive status of the fish on the responsiveness of the pineal photoreceptor cells in C. catla following exposure to LL and DD. To this end, a total of four experiments were carried out during the four different phases of the annual reproductive cycle that is characteristic of this species. Each of these four experiments was carried out for a period of 30 days after which the fishes were sacrificed, different parts of the pineal complex were dissected out, and processed for histological and karyometric studies. Our results showed that the pineal complex in this species is composed of three separate but connected parts, (a) an end vesicle (EV); (b) a dorsal sac (DS); and (c) a long and thin pineal stalk (PS) that attaches the EV to the DS. Detailed karyometric and histo-morphologic studies following exposure of the animals to DD and LL showed that constant darkness led to a stimulatory effect on the pineal photoreceptor cells of the EV as evident from a significant increase in the nuclear diameter. In contrast, the nuclear diameter of the photoreceptor cells in animals subjected to constant light showed a significant reduction. Furthermore, the observed cellular changes in the EV of fish exposed either to LL or DD were independent of the stage of the gonadal cycle. The apparent lack of any cellular responses either in the PS, or in the DS, following exposure to LL and DD, suggests that in C. catla the photoreceptor cells are located only within the epithelial lining of the EV and that these cells respond in a manner similar to mammalian pinealocytes when subjected to comparable photoperiod-induced experimental conditions.
机译：与松果体是位于大脑背侧的离散结构的哺乳动物相反，硬骨鱼类中的“松果体”由许多单独但相连的组成部分组成，统称为“松果体”。在本文中，我们描述了一种常见的印度鲤鱼Catla catla中的松果体复合体，它具有每年的繁殖周期。试图（a）深入描述松果体的结构; （b）通过将动物暴露在恒定的光照（LL）和恒定的黑暗（DD）下，确定松果体的感光细胞。此外，我们检查了鱼类的繁殖状况对C. catla中松果体感光细胞响应于LL和DD后的任何可能影响。为此，在该物种特征的年度生殖周期的四个不同阶段共进行了四个实验。这四个实验中的每一个都进行了30天，然后处死了鱼，解剖了松果体的不同部分，并进行了组织学和测角研究。我们的结果表明，该物种的松果体复合体由三个独立但相连的部分组成：（a）端囊（EV）; （b）背囊（DS）; （c）将EV连接到DS上的细长的松果梗（PS）。将动物暴露于DD和LL后进行的详细的人体测量学和组织形态学研究表明，持续不断的黑暗导致EV的松果体感光细胞产生刺激作用，这从核直径的显着增加可以明显看出。相反，在恒定光照下的动物中，感光细胞的核直径显着减小。此外，观察到的暴露于LL或DD的鱼的EV的细胞变化与性腺周期的阶段无关。暴露于LL和DD后，PS或DS中明显缺乏任何细胞反应，这表明在C. catla中，感光细胞仅位于EV的上皮内，并且这些细胞在在类似的光周期诱导的实验条件下与哺乳动物松果体细胞相似的方式。

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