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Neural correlation between the central and the peripheral neurons in the regulation of the digestive tract in Aplysia

Research Project

Project/Area Number 16570066
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Animal physiology/Animal behavior
Research InstitutionTokyo Metropolitan University

Principal Investigator

KUROKAWA Makoto  Tokyo Metropolitan University, Department of Biological Science, Assistant Professor, 都市教養学部理工学系, 助教授 (50211222)

Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsAplysia / digestive tract / innervation / peripheral nervous system / neural plexus / mollusk / neurogenic / 神経原性
Research Abstract

The enteric nervous system, containing a large number of peripheral neuronal somata, is intrinsic to the digestive organs in Aplysia. Two types of rhythmic bursting activities were recorded from the peripheral neurons in preparations in which the central nervous system had been removed. One of the bursting activities was shorter in duration and was recorded in synchrony from the neurons on the crop, the ring nerve and the gizzard. This activity was suggested to cause the neurogenic movement of the gizzard. The other bursting activity was longer in duration and was recorded synchronously from the neurons on the crop and the ring nerve, but not on the gizzard. When the crop, the organ in which food is temporarily stored, was distended by means of a small balloon, the frequencies of both types of bursting activities were increased. These results suggest that varoceptive peripheral reflexes are involved in the regulation of digestive movements in Aplysia, while the functions of the longer-duration bursting activity should be examined in future studies.
The autonomic movements of the gizzard comprise both constrictions for trituration and the partial contractions for mixing its contents. It was shown that the constrictions are the neurogenic contractions originating in the synchronous bursting activities of peripheral neurons as described above and the partial contractions are the myogenic ones generated by the pacemaker potential in the musculature. Acetylcholine applied to the gizzard increased frequencies of both the synchronous bursting activities of the peripheral neurons and the pacemaker potentials in the muscle cells with a dose-dependent manner, while the synchrony among the peripheral bursting neurons was augmented. The results suggest that both the peripheral neurons and muscle cells on the gizzard have cholinergic receptors and are involved in the acceleration of digestive movements of the gizzard.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (14 results)

All 2006 2005 2004

All Journal Article (14 results)

  • [Journal Article] Excitatory neural control of posterograde heartbeat by the frontal ganglion in the last instar larva of a lepidoptera Bombyx mori.2006

    • Author(s)
      Uchimura, K., Ai, H., Kuwasaw, K., Matsushita, T., Kurokawa, M.
    • Journal Title

      Journal of Comparative Physiology A 192

      Pages: 175-185

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Excitatory neural control of posterograde heartbeat by the frontal ganglion in the last instar larva of a lepidopteran, Bombyx mori.2006

    • Author(s)
      K.Uchimura, H.Ai, K.Kuwasawa, T.Matsushita, M.Kurokawa
    • Journal Title

      Journal of Comparative Physiology, A 192

      Pages: 175-185

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Excitatory neural control of posterograde heartbeat by the frontal ganglion in the last instar larva of a lepidopteran, Bombyx mori.2006

    • Author(s)
      Uchimura, K., Ai, H., Kuwasawa, K., Matsushita, T., Kurokawa, M.
    • Journal Title

      Journal of Comparative Physiology A 192

      Pages: 175-185

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Ito, S., and Kurokawa, M. (2005) Synchronous activities of peripheral neurons and their machanoreceptive regulation in enteric nervous system of Aplisia.2005

    • Author(s)
      Ito, S., Kurokawa, M.
    • Journal Title

      Comparative Biochemistry and Physiology 142B

      Pages: 481-482

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Synchronous activities of peripheral neurons and their mechanoreceptive regulation in the enteric nervous system of Aplysia.i2005

    • Author(s)
      S.Itoh, M.Kurokawa
    • Journal Title

      Comparative Biochemistry and Physiology, B 142

      Pages: 481-482

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Ito, S., and Kurokawa, M. (2005) Synchronous activities of peripheral neurons and their mechanoreceptive regulation in the enteric nervous system of Aplysia.2005

    • Author(s)
      Ito, S., Kurokawa, M.
    • Journal Title

      Comparative Biochemistry and Physiology 142B

      Pages: 481-482

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Dual acceleratory actions of acetylcholine on the autonomic movements of gizzard in Aplysia.2005

    • Author(s)
      Ito, S., Kurokawa, M.
    • Journal Title

      Zoological Science 22・12

      Pages: 1480-1480

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Excitatory neural control of posterograde heartbeat by the frontal ganglion in a lepidopteran, Bombyx mori.2005

    • Author(s)
      K.Uchimura, H.Ai, K.Kuwasawa, T.Matsushita, M.Kurokawa
    • Journal Title

      Journal of Experimental Biology (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Synchronous activities of neurons distributed throughout the neural plaxus of the digenstive organ in Aplysia.2004

    • Author(s)
      S.Itoh, M.Kurokawa
    • Journal Title

      Zooligical Science 21・12

      Pages: 1314-1314

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Gizzard movements in Aplysia are composed of both neurogenic contractions attributable to the peripheral neurons and myogenic contractions.2004

    • Author(s)
      S.Itoh, M.Kurokawa
    • Journal Title

      Comparative Biochemistry and Psysiology, B 139・4

      Pages: 774-774

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Synchronous activities of neurons distributed throughout the neural plexus of the digenstive organ in Aplysia.2004

    • Author(s)
      S.Itoh, M.Kurokawa
    • Journal Title

      Zoological Science 21,12

      Pages: 1314-1314

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Gizzard movements in Aplysia are composed of both neurogenic contractions attributable to the peripheral neurons and myogenic contractions.2004

    • Author(s)
      S.Itoh, M.Kurokawa
    • Journal Title

      Comparative Biochemistry and Physiology, B 139,4

      Pages: 774-774

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Synchronous activities of neurons distributed throughout the neural plexus of the digenstive organ in Aplysia.2004

    • Author(s)
      S.Itoh, M.Kurokawa
    • Journal Title

      Zoological Science 21・12

      Pages: 1314-1314

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Gizzard movements in Aplysia are composed of both neurogenic contractions attributable to the peripheral neurons and myogenic contractions.2004

    • Author(s)
      S.Itoh, M.Kurokawa
    • Journal Title

      Comparative Biochemistry and Physiology, B 139B・4

      Pages: 774-774

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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