Morphological Study of the Regeneration of the Mouse Olfactory Epithelial Cells after Destruction by Intranasal Zinc Sulfate Irrigation

코 안 $ZnSO_4$ 점적으로 손상된 마우스 후각 상피세포의 재생에 대한 형태학적 연구

  • Kang, Wha-Sun (Department of Natural Science, College of Medicine, Catholic University) ;
  • Moon, Young-Wha (Department of Natural Science, College of Medicine, Catholic University)
  • 강화선 (가톨릭대학교 의과대학 자연과학교실) ;
  • 문영화 (가톨릭대학교 의과대학 자연과학교실)
  • Published : 2007.12.31

Abstract

The morphological effects of intranasal zinc sulfate(5% solution) irrigation on the mouse olfactory epithelium and the regeneration process of olfactory receptor cells following nasal irrigation were studied with scanning and transmission electron microscope. The results were as follows: 1. The septal epithelium except some basal cells was wholly detached from the basement membrane, during the first 6 to 24 hours after 5% zinc sulfate irrigation. 2. 3 days after $ZnSO_4$ treatment, two layered septal epithelium was formed from basal cells. And microvilli were observed in the apical epithelium of newly formed olfactory epithelial cells. 3. 5 days after treatment, a lot of centrosomes and basal bodies were observed in the olfactory receptor cells, and cilia were lined up between microvilli on the apical membrane of olfactory receptor cells. And immature olfactory knob was first observed in the newly formed olfactory receptor cells. Mature olfactory knob was observed 1 week after treatment. 4. There are very many mature olfactory knobs in the olfactory receptor cells 2 weeks after intranasal zinc sulfate irrigation. These results support that treatment with 5% zinc sulfate is a good experimental model for the regeneration of mammalian nervous tissues because this method could thoroughly detach the septal epithelium. During the regeneration of olfactory receptor cells, the surface membrane of the olfactory receptor cells widen the surface with the microvilli. Then cilia, which arranged in a line, substituted for the microvilli. The part of the surface membrane with cilia protruded and finally formed the olfactory vesicle.

마우스의 코 안으로 5% $ZnSO_4$용액을 점적하는 것이 코중격 후각상피에 미치는 영향과, 그 이후 후각수용세포가 재생되는 과정을 주사전자현미경과 투과전자현미경을 사용하여 형태학적으로 조사하였고, 그 결과는 다음과 같다. 1. 5% $ZnSO_4$용액을 점적한 후 6시간에서 24시간 사이에 코중격 후각상피층은 일부의 기저세포들을 제외하고는 완전하게 탈락되었다. 2. $ZnSO_4$처리 후 3일군에서는 코중격 후각상피세포들 중 부분적으로 남아 있던 기저세포들의 세포분열로 형성된 새로운 후각상피세포들로 후각상피층은 2층으로 나타났다. 또한 새롭게 형성된 후각상피세포들의 상부 세포막에는 미세응모가 돌출되었다. 3. 5% $ZnSO_4$용액을 점적하고 5일이 경과된 코중격 후각수용세포들에서는 다수의 중심소체와 기저소체가 관찰되었고, 상부 세포막에는 미세응모들 사이에 섬모들이 줄지어 나타났다. 또한 새롭게 형성된 코중격 후각수용세포들에서 처음으로 후각소포의 초기 형태가 나타났으며, 1주가 경과된 후각상피층에는 전형적인 형태의 후각소포를 관찰할 수 있었다. 4. 5% $ZnSO_4$용액 점적 후 2주가 경과된 경우, 성숙한 형태의 후각소포를 가지고 있는 후각수용세포가 관찰되었다. 이와 같은 결과는 5% $ZnSO_4$용액의 처리가 마우스 코중격의 후각상피층을 완전하게 박리시킬 수 있으므로 포유류 신경조직의 재생연구를 위해 유용한 실험적 모델임을 뒷받침한다, 또한 새롭게 재생되는 후각수용세포의 상부 세포막이 처음에는 미세응모로 표면적을 넓히고, 시간이 경과함에 따라 일렬로 배열된 섬모들로 대치되며, 그 후 섬모를 포함한 상부세포막이 부분적으로 돌출하고, 마지막으로 전형적인 후각소포로 발달한다.

Keywords

References

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