Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Brain Vesicle Structure and Formation of the Hydrostatic Pressure Receptors in Larvae of the Ascidian (Halocynthia roretzi)

우렁쉥이(Halocynthia roretzi) 유생의 뇌포 구조와 수압수용쳬의 형성

  • Kim Jung-Eun (Faculty of Marine Bioscience and Technology, Kangnung National University) ;
  • Seo Hyeong-Joo (Faculty of Marine Bioscience and Technology, Kangnung National University) ;
  • Kim Gil-Jung (Faculty of Marine Bioscience and Technology, Kangnung National University)
  • 김정은 (강릉대학교 해양생명공학부) ;
  • 서형주 (강릉대학교 해양생명공학부) ;
  • 김길중 (강릉대학교 해양생명공학부)
  • Published : 2006.04.01
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Abstract

The tadpole larvae of most ascidians have two sensory pigment cells in their brain vesicle. The anterior otolith pigment cell is sensitive to gravity, whereas the posterior ocellus pigment cell responds to light. Besides these two sensory cells, the larvae also possess another type of sensory receptor cell: hydrostatic pressure receptor (Hpr) cells. The Hpr cells have been presumed to sense hydrostatic water pressure, although no functional analysis has been performed. In larvae of the ascidian Halocynthia reretzi, the development of the Hpr cells and their structure in the brain vesicle are poorly understood. To investigate the morphology and formation of the Hpr cells, we established a monoclonal antibody, Hpr-1, that specifically recognizes Hpr cells. The Hpr-1 antigens became detectable in the brain vesicle at the late tailbud stage. Each Hpr cell projected a small globular body, connected by a short stalk, into the lumen of the brain vesicle. The brain vesicle showed remarkable left-right asymmetry. Pigment cells were located on the right side in the lumen of the brain vesicle, whereas Hpr cells were present in the left side. After metamorphosis, the Hpr cells were observed near the rudimental siphons of the juvenile.

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References

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