Spontaneous Electrical Activity of Sea Urchin Lantern Protractor Muscle.

IF 2.1 4区 生物学 Q2 BIOLOGY
Biological Bulletin Pub Date : 2024-04-01 Epub Date: 2025-03-19 DOI:10.1086/734629
Jackson Deneka, Madeleine Rumingan, Patrick Rodriguez, McCourry Gortney, Emma Howell, Seif S Aldalil, Bea Richardson, Chris Shelley
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引用次数: 0

Abstract

AbstractThe many different muscles of sea urchins are used to control tube foot and spine movement, feeding, excretion, respiration, and gamete release. Unlike in most other animals, the delineation between skeletal and smooth muscles in sea urchins is not clear cut, with many muscles showing characteristics of both muscle types. To further our understanding of sea urchin muscle function, we sought to characterize the electrical properties of protractor muscles of the Aristotle's lantern. Aristotle's lantern comprises a complex of multiple different muscles, ligaments, and calcite ossicles and is primarily involved in feeding. Within the lantern, antagonistic muscle pairs of protractor and retractor muscles act to raise or withdraw the lantern, respectively. The protractor muscles are unstriated, similar to smooth muscle, but connected to the calcite skeleton, as with skeletal muscles. We isolated single muscle cells from the protractor muscles and measured their membrane potentials and found that they generate spontaneous currents at a frequency that ranged from 25 to 30 Hz, a functional property found in many smooth muscles. Furthermore, these currents occurred in the absence of any extraneous cellular or chemical input. Measurement of the reversal potential of the currents under control and ion-substituted conditions suggests that they may be due to the activity a nonspecific cation channel or the synchronous activity of K+ and Na+ channels.

海胆灯笼量角器肌的自发电活动。
摘要海胆的许多不同肌肉被用来控制管足和脊柱的运动、进食、排泄、呼吸和配子的释放。与大多数其他动物不同,海胆的骨骼肌和平滑肌之间的界限并不明确,许多肌肉显示出两种肌肉类型的特征。为了进一步了解海胆肌肉的功能,我们试图描述亚里士多德灯笼的量角器肌肉的电学特性。亚里士多德的灯笼由多种不同的肌肉、韧带和方解石小骨组成,主要与进食有关。在提灯内,对抗性肌肉对的量角器和牵引器分别作用于提灯或缩回提灯。量角肌是无纹路的,类似于平滑肌,但与方解石骨架相连,就像骨骼肌一样。我们从量角器肌中分离出单个肌肉细胞,并测量了它们的膜电位,发现它们在25至30赫兹的频率范围内产生自发电流,这是许多平滑肌中发现的功能特性。此外,这些电流发生在没有任何外来细胞或化学输入的情况下。在控制和离子取代条件下电流的逆转电位的测量表明,它们可能是由于非特异性阳离子通道的活性或K+和Na+通道的同步活性。
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来源期刊
Biological Bulletin
Biological Bulletin 生物-海洋与淡水生物学
CiteScore
3.30
自引率
6.20%
发文量
47
审稿时长
6-12 weeks
期刊介绍: The Biological Bulletin disseminates novel scientific results in broadly related fields of biology in keeping with more than 100 years of a tradition of excellence. The Bulletin publishes outstanding original research with an overarching goal of explaining how organisms develop, function, and evolve in their natural environments. To that end, the journal publishes papers in the fields of Neurobiology and Behavior, Physiology and Biomechanics, Ecology and Evolution, Development and Reproduction, Cell Biology, Symbiosis and Systematics. The Bulletin emphasizes basic research on marine model systems but includes articles of an interdisciplinary nature when appropriate.
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