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首页> 外文期刊>Zoological Science >Comparative studies on the energy metabolism in spermatozoa of four closely related species of sea urchins (Genus Echinometra) in Okinawa
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Comparative studies on the energy metabolism in spermatozoa of four closely related species of sea urchins (Genus Echinometra) in Okinawa

机译：冲绳四种近亲海胆（精子）的精子能量代谢比较研究

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摘要

Sea urchins of the genus Echinometra are abundant on Okinawa reef flats in southern Japan. The Okinawan Echinometra is designated into four sympatric and closely related species: A, B, C, and D (Ea, Eb, Ec, and Ed). The sperm head size and shape gradually changes to become longer and more slender according to the following order: Ea, Eb, Ec, and Ed. To obtain information regarding speciation in Okinawan Echinometra, this study examined comparatively the energy production system of spermatozoa of Ea, Eb, Ec, and Ed. All spermatozoa contained cholesterol and several kinds of phospholipids. Glycogen, glucose, and triglyceride were present at extremely low levels. After incubation in seawater, a decrease in the level of phosphatidylcholine (PC) was observed in all spermatozoa concomitantly with activation of motility and respiration. The hydrolysis of PC correlated with the activity of phospholipase A(2). Interestingly, the amount of PC consumed, the respiratory rate, and the phospholipase A2 activity in spermatozoa of Ea and Eb were approximately two-fold higher than those of Ec and Ed. Ultrastructural studies showed that lipid bodies within mitochondria were present in the midpieces of all species of spermatozoa. They became small or disappeared after incubation in seawater. Thus, the results obtained strongly suggest that spermatozoa of Ea, Eb, Ec, and Ed all use PC located in the lipid bodies as a substrate for energy metabolism. Also, it seems likely that energy production activities in Ea and Eb spermatozoa are stronger than those in Ec and Ed. The properties of energy metabolism in different species of sea urchin may be related to their habitat.
机译：Echinometra属的海胆在日本南部的冲绳礁滩上很丰富。冲绳纲棘皮动物被指定为四个同属和密切相关的物种：A，B，C和D（Ea，Eb，Ec和Ed）。精子头部的大小和形状会根据以下顺序逐渐变长和变细：Ea，Eb，Ec和Ed。为了获得有关冲绳棘皮动物物种形成的信息，本研究比较地考察了Ea，Eb，Ec和Ed精子的能量产生系统。所有的精子都含有胆固醇和几种磷脂。糖原，葡萄糖和甘油三酸酯的含量极低。在海水中孵育后，观察到所有精子中磷脂酰胆碱（PC）的水平降低，并伴随着运动和呼吸的激活。 PC的水解与磷脂酶A（2）的活性有关。有趣的是，Ea和Eb精子中PC消耗量，呼吸频率和磷脂酶A2活性大约是Ec和Ed的两倍。超微结构研究表明，线粒体内的脂质体存在于所有精子物种的中期。在海水中孵化后，它们变得很小或消失了。因此，获得的结果强烈表明，Ea，Eb，Ec和Ed的精子均使用位于脂质体内的PC作为能量代谢的底物。同样，Ea和Eb精子的能量生产活动似乎比Ec和Ed的能量生产活动更强。不同种类海胆中能量代谢的特性可能与其栖息地有关。

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