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2001 Fiscal Year Final Research Report Summary

Intestinal motility immune systems in Hirschsprung's disease model animals

Research Project

Project/Area Number 12460132
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Basic veterinary science/Basic zootechnical science
Research InstitutionTHE UNIVERSITY OF TOKYO

Principal Investigator

OZAKI Hiroshi  Graduate school of Agriculture and Life Sciences, Veterinary Pharmacology, The University of Tokyo, Assoc. Prof., 大学院・農学生命科学研究科, 助教授 (30134505)

Co-Investigator(Kenkyū-buntansha) NAKAYAMA Hiroyuki  Graduate school of Agriculture and Life Sciences, Veterinary Pathology, The University of Tokyo, Assoc. Prof., 大学院・農学生命科学研究科, 助教授 (40155891)
HORI Masatoshi  Graduate school of Agriculture and Life Sciences, Veterinary Pharmacology, The University of Tokyo, Assist. Prof., 大学院・農学生命科学研究科, 助手 (70211547)
SATO Koichi  Graduate school of Agriculture and Life Sciences, Veterinary Pharmacology, The University of Tokyo, Assist. Prof., 大学院・農学生命科学研究科, 助手 (90205914)
Project Period (FY) 2000 – 2001
KeywordsHirschsprung's disease / motility / contraction / morphology / endothelin B receptor / smooth muscle / megaileum / NO
Research Abstract

The endothelin ETB receptor null rat (ETB(-/-)R) has an intestinal segment without ganglia, and this rat is characterized by an intestinal obstruction similar to those observed in human Hirschsprung' s disease. In the present study, we have examined the myogenic mechanism responsible for the obstruction in the ETB(-/-)R.
The ETB(-/-)R has an enlarged belly and the average life span was 18.1 day. The bowel from the rectum to the lower part of the small ileum, was constricted whereas the upper region was dilated with fecal stasis and thus presented megaileum. The constricted muscle segments without ganglia had a greater increase in absolute force when stimulated by carbachol, high K+, and endothelin-1 comparing to that of normal siblings. In contrast, in the dilated part with ganglia, the absolute contractile force due to these stimulants in the ETB(-/-)R was not different from that in the ETB(+/+)R. Such a functional hypertrophy of the musculature was observed in the parts of the colon, caecum, and distal ileum without ganglia, but not in the part of the proximal ileum and jejunum with ganglia. Morphological study demonstrated that the thickness of the circular and longitudinal muscle layers was greater in the constricted part of the intestine in the ETB(-/-)R, and these changes were associated with an increase in the number of smooth muscle cells.
The above findings suggest that both the increased contractility of smooth muscle and the increased thickness of the intestinal muscular wall may contribute to the intestinal obstruction in the ETB(-/-)R.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] K-J Won, S Torihashi, M Mitsui-Saito, M Hori, K Sato, T Suzuki, H Ozaki, H Karaki: "Increased smooth muscle contractility of intestine in the genetic null of the endothelin ETB receptor, a rat model for long-segment Hirschsprung's disease"Gut. 50. 355-360 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Torihashi, M.Hori, H.Ozaki: "Macrophages in muscle layer of gastrointestinal tract : Impairment of muscle contraction by treatment with Iipopolysaccharide"Acta. Histochem. Cytochem.. 34. 219-222 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Anabuki, M.Hori, K.Hayakawa, S.Akahane, H.Ozaki, H.Karaki: "Muscarinic stimulation does not induce RhoA/ROCK mediated Ca^<2+> sensitization of contractile element in chicken gizzard smooth muscle"Pflugers Arch. Eur. J. Physiol.. 441. 189-199 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hori, M.Kita, S.Torihashi, S.Miyamoto, K.-J.Won, H.Ozaki, H.Karaki: "Up-regulation of iNOS by COX-2 in muscularis resident macrophage of rat intestine stimulated with LPS"Am. J. Physiol.. 280. G930-G938 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.-C.Kwon, H.Ozaki, H.Karaki: "Mechanisms of the inhibitory effect of NO donor, sodium nitroprusside, on excitation-contraction coupling in guinea-pig taenia coli"Am. J. Physiol.. 279. G1235-G1241 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K-J Won, S Torihashi, M Mitsui-Saito, M Hori, K Sato, T. Suzuki, H Ozaki, H Karaki: "Increased smooth muscle contractility of intestine in the genetic null of the endothelin ETB receptor, a rat model for long-segment Hirschsprung's disease"Gut. 50. 355-360 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Torihashi, M. Hori, H. Ozaki: "Macrophages in muscle layer of gastrointestinal tract : Impairment of muscle contraction by treatment with lipopolysaccharide"Acta. Histochem. Cytochem.. 34. 219-222 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Anabuki, M. Hori, K. Hayakawa, S. Akahane, H. Ozaki, H. Karaki: "Muscarinic stimulation does not induce RhoA/ROCK mediated Ca^<2+> sensitization of contractile element in chicken gizzard smooth muscle"Pflugers Arch. Eur. J. Physiol.. 441. 189-199 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Hori, M. Kita, S. Torihashi, S. Miyamoto, K. -J. Won, H. Ozaki, H. Karaki: "Up-regulation of iNOS by COX-2 in muscularis resident macrophage of rat intestine stimulated with LPS"Am. J. Physiol.. 280. G930-G938

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. -C. Kwon, H. Ozaki and H. Karaki: "Mechanisms of the inhibitory effect of NO donor, sodium nitroprusside, on excitation-contraction coupling in guinea-pig taenia coli"Am. J. Physiol.. 279. G1235-G1241

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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