작은땃쥐 Crocidura suaveolens와 우수리땃쥐 C. lasiura의이하선 선세포와 분비과립의 미세구조 비교
Comparative Ultrastructure of the Acinar Cell and Secretory Granules ofParotid Salivary Gland in the Lesser White-toothed Shrew, Crocidurasuaveolens and the Big White-toothed Shrew, C. lasiura
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이하선의 선세포와 분비과립을 작은땃쥐 Crocidurasuaveolens와 우수리땃쥐 C. lasiura에서 연구하였다.두 종 모두의 이하선은 장액선세포 한 종류만을 가지는 장액선이었고 선세포, 사이관, 과립관 그리고 줄무늬관들은 평범하였다. 작은땃쥐의 경우, 장액선세포는 잘 발달된 조면소포체, 현저한 골지체, 몇몇의 큰 미토콘드리아와성숙 혹은 융합하고 있는 많은 중간 정도의 전자 밀도과립들을 가지고 있었다. 미성숙 선세포의 분비과립들은미세하고 강한 전자 밀도의 알갱이만으로 혹은 알갱이들이 주가 되었고 불분명한 경계막을 가지고 있었고, 성숙분비과립들은 균일하고 옅은 중심부를 가지고 그 주변에미세하고 강한 전자밀도의 알갱이들과 명확한 경계막을가지고 있었다. 우수리땃쥐의 경우, 선세포는 잘 발달된조면소포체, 현저한 골지체, 몇몇의 큰 미토콘드리아 뿐아니라 성숙 혹은 융합하고 있는 많은 진한 전자 밀도의분비과립들을 가지고 있었다. 미성숙 선세포 분비과립들은 옅고 거친 알갱이들만으로 채워져 있었으며 불명확한경계막을 가지고 있었고, 성숙 분비과립들은 진하고 거친알갱이들만으로 채워져 있었고 명확한 경계막을 가지고있었다. 결국, 작은땃쥐의 이하선 분비과립은 광학과 전자현미경 수준에서 중간 정도의 전자밀도로, 우수리땃쥐의분비과립은 광학 현미경 수준에서는 아주 진하게, 전자현미경에서는 진하게 관찰되었다.
Abstract
The acinar cells and secretory granules of the parotid salivary gland were examined in the lesser white toothed shrew, Crocidura suaveolens and the big white-toothed shrew, C. lasiura. The parotid gland of both species were a serous gland having only one kind of serous acinar cells, and had conventional arrangement of acini and intercalated, granular and striated ducts. In case of C. suaveolens, serous acinar cells had well developed rER, prominent Golgi complex, several large mitochondria and abundant moderate dense secretory granules with various stages of the maturing or fusing process. Immature acinar secretory granules were only or mainly filled with fine strong dense specks and had an indistinct limiting membrane, and mature granules were filled with homogeneous pale large round center and had fine strong dense specks at the periphery of the homogeneous pale center and a distinct limiting membrane. In case of C. lasiula, serous acinar cells had well developed rER, prominent Golgi complex, several large mitochondria and abundant dense secretory granules with maturing or fusing process. Immature acinar secretory granules were only filled with pale rough specks and had an indistinct limiting membrane, and mature granules were only filled with rough dense specks and had a distinct limiting membrane. Eventually The acinar secretory granules of C. suaveolens were seen moderate at the light and ultrastuctural level, those of C. lasiura were strong dense at the light microscopic level and dense at the ultrastructural level.
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