Three-dimensional characteristics of submandibular salivary gland of ageing rats: an HRSEM study. |
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| Authors: | Tsunae Elizabeth D'Avola Koichi Ogawa Micena Roberta Miranda Alves e Silva Aracy Akiko Motoyama Edgar Inácio Bruno K?nig Junior Ii-sei Watanabe |
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| Affiliation: | 1. Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, Avenida Professor Lineu Prestes, 2, 415 Cidade Universitária, CEP 05508-900 São Paulo, Brazil;2. Department of Anatomy, Fukuoka University, School of Medicine, Japan;3. Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Minas Gerais, Brazil;4. Department of Morphology, School of Dentistry, Ribeirão Prêto “campus”, University of Sao Paulo, Brazil;1. Southwest Technology and Engineering Research Institute, Chongqing 400039, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, China;3. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;1. Dept. Of Mechanical Engineering, SV University, Tirupati, Andhra Pradesh, 517502, India;2. Department of Mechanical Engineering, SEA College of Engineering and Technology, Bangalore, Karnataka, India;1. Defence Metallurgical Research Laboratory, Hyderabad 500058, India;2. Department of Physics, National Taiwan University, Taipei 106, Taiwan;3. Institute for Nanomaterials, Advanced Technologies and Innovation, Department of Natural Sciences, Technical University of Liberec, Studentská 1402/2, Liberec 1 461 17, Czech Republic;1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. Institute of Sci-technology Strategy, JiangXi Academy of Sciences, Nanchang 330096, PR China |
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| Abstract: | The characteristics of the submandibular glands of ageing Wistar rats were studied using light and high-resolution scanning electron microscopy (HRSEM) methods. For light microscopy, the samples were fixed in Bouin solution and embedded in paraffin. Sections were stained with hematoxilin-eosin and Azo-Carmin. For conventional scanning electron microscopy, the tissues were fixed in modified Karnovsky solution, and treated with NaOH solution for 3-4 days. The O-D-O method was used for HRSEM. The samples were fixed in 2% osmium tetroxide, macerated in diluted osmium and dehydrated in an increasing series of ethanol. The samples were dried in a critical point dryer, coated with gold-palladium and examined in a Hitachi high-resolution scanning electron microscope, S-900. The results showed that submandibular glands with lobules are separated by connective tissue septum. The acinar formations and the ducts, revealing the serous and mucous cells were observed. After fracture in liquid nitrogen and treatment with NaOH solution to remove the cellular components, the original disposition of the collagen bundles fibers were revealed corresponding to the round, oval or irregular acinar and ductal structures. In the cytoplasm, organelles such as mitochondria, rough endoplasmic reticulum, Golgi apparatus and serous and mucous secretory granules were observed localized in the apical portion in three-dimensional HRSEM images. The serous secretory granules presented different sizes and shapes showing the modifications which occurred in the ageing rats. The striated duct cells revealed the presence of the secretory cells and mitochondria in parallel disposition. The mitochondrial cristae were noted in three-dimensional aspects. The lumen presented numerous cytoplasmic microprojections. The lumen of excretor ducts are covered by polygonal epithelial cells containing numerous microplicae. |
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