著者
Daisuke Koga Tatsuo Ushiki
出版者
International Society of Histology and Cytology
雑誌
Archives of Histology and Cytology (ISSN:09149465)
巻号頁・発行日
vol.69, no.5, pp.357-374, 2006 (Released:2007-03-12)
参考文献数
39
被引用文献数
20 21

The three-dimensional ultrastructure of the Golgi apparatus in different cells of the rat - epithelial principal cells in the epididymal duct, goblet cells in the jejunum, gonadotrophs in the pituitary gland and dorsal root ganglion cells - was studied by scanning electron microscopy (SEM) of osmium-macerated tissues. The Golgi apparatus in the epididymal principal cells took the shape of a candle flame with irregular-shaped cisterns, while those in the goblet cells of the jejunum were cup-shaped or cylindrical with flat cisterns. Gonadotrophs had a large spherical Golgi apparatus; this apparatus was composed of several concentric cisterns with large round windows through which the rough endoplasmic reticulum (rER) and mitochondria extended into the center of the globular Golgi apparatus. Dorsal root ganglion cells had several small Golgi stacks scattered in the cytoplasm. In all Golgi apparatuses of the different cells examined in the present study, the cis-most cistern was generally composed of a flattened sheet with numerous small fenestrations on its wall. On the other hand, the shape of the trans-most cistern varied by cell type; it was generally composed of tubules and/or small sheets which were sometimes connected with each other to form a rather complicated structure. The cis-most cistern and the trans-most cistern were often closely associated with the rER although no direct communication was found between them. These findings indicate that the structure of the Golgi apparatus, especially its overall shape and the ultrastructure of the trans-most cistern, varies by cell type, a point to be considered in relation to the function of the individual cells.
著者
Shohei YAMASHINA Hideaki TAMAKI Osamu KATSUMATA
出版者
International Society of Histology and Cytology
雑誌
Archives of Histology and Cytology (ISSN:09149465)
巻号頁・発行日
vol.62, no.4, pp.347-354, 1999 (Released:2005-12-01)
参考文献数
26
被引用文献数
9 12

The ultrastructure of the secretory endpiece of the rat sublingual gland was examined in samples prepared by rapid freezing and freeze-substitution method, and results were analyzed in combination with 3-D images reconstructed by computer graphics from light micrographs of serial sections. Fixation by rapid freezing followed by freeze-substitution preserved cellular ultrastructures, especially the membrane structure, in perfect condition, and demonstrated the terminal portion of the sublingual gland to be a compound branched tubulo-alveolar gland with serous cells distributed throughout the end-pieces. All the serous cells aligned with mucous cells to surround a common lumen, leaving no demilune structure. In contrast, samples fixed by the conventional immersion method showed distended mucous cells displacing the serous cells toward the basal portion of the acinus to form the demilune structure. The luminal space was also compressed and appeared disconnected from the serous cells. From these observations, the serous demilune that for more than 130 years has been believed to be an actual histological entity was proved to be an artificial structure produced through compression by the hydrated and expanded mucous cells during immersion fixation.
著者
Yuji Sonoda Kazunobu Sasaki
出版者
International Society of Histology and Cytology
雑誌
Archives of Histology and Cytology (ISSN:09149465)
巻号頁・発行日
vol.71, no.3, pp.155-161, 2008 (Released:2009-02-05)
参考文献数
15
被引用文献数
7 8

This study used 100-μm thick paraffin sections stained by the ER-HR3 antibody to examine the three-dimensional surface morphology of the central macrophages of erythroblastic islets in the splenic red pulp of aged and pregnant mice. The ER-HR3-positive cells were the macrophages located at the center of the erythroblastic islets, and the number per unit of splenic area was almost constant until 30 days of age, thereafter showing a marked decrease. In pregnant females, the ER-HR3-positive macrophage number significantly increased and became approximately eight times higher than the control value. In aged virgin females, the islet macrophages were generally ovoid in cell profile, and shallow cup-shaped dents were formed on their cell surface. However, in pregnant females, the macrophages became larger in size, and cell socket structures, formed by long finger-like cytoplasmic processes, became prominent on their cell surface. The 3-D images, obtained from 100-μm thick paraffin sections, provided the clear morphological evidence of the activity of the islet macrophages in spleen erythropoiesis.
著者
石川 春律
出版者
国際組織細胞学会
雑誌
Archives of Histology and Cytology (ISSN:09149465)
巻号頁・発行日
vol.51, no.2, pp.127-145, 1988 (Released:2011-10-26)
参考文献数
97
被引用文献数
10 13

The plasmalemmal undercoat can be defined as the electron-dense material of layered organization closely applied to the cytoplasmic surface of the plasma membrane (plasmalemma) as revealed by thin-section electron microscopy. Though the structures which fulfill this criterion occur widely, most of them have not received the attention they may deserve. The undercoat is a special form of the cytoskeleton-membrane interaction, though it constitutes a part of the cytoskeleton. The significance of the plasmalemmal undercoat may be primarily to provide a structural support for the membrane. With this support, cells can perform many important functions on their limited or whole surfaces. The undercoat may provide a mechanical support to the plasmalemma so that the membrane may acquire rigidity, strength and elasticity. Through association with the membrane, the undercoat may regulate the distribution of integral membrane proteins to form and maintain various functional domains on the plasmalemma. The undercoat may further provide attachment sites for cytoskeletal fibrous components such as actin filaments, intermediate filaments and microtubules.
著者
Susumu YAMAMOTO Hiroya HASHIZUME Jiro HITOMI Masatsugu SHIGENO Shoichi SAWAGUCHI Haruki ABE Tatsuo USHIKI
出版者
国際組織細胞学会
雑誌
Archives of Histology and Cytology (ISSN:09149465)
巻号頁・発行日
vol.63, no.2, pp.127-135, 2000 (Released:2005-11-22)
参考文献数
18
被引用文献数
29 44

The present study was designed to analyze the subfibrillar structure of corneal and scleral collagen fibrils by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Isolated collagen fibrils of the bovine cornea and sclera were fixed with 1% OsO4, stained with phosphotungstic acid and uranyl acetate, dehydrated in ethanol, critical point-dried, metal-coated, and observed in an in-lens type field emission SEM. Some isolated collagen fibrils were fixed with 1% OsO4, dehydrated, critical point-dried and observed without metal-coating in an AFM. Isolated collagen fibrils treated with acetic acid were also examined by SEM and AFM. SEM and AFM images revealed that corneal and scleral collagen fibrils had periodic transverse grooves and ridges on their surface; the periodicity (i. e., D-periodicity) was about 63 nm in the cornea and about 67 nm in the sclera. Both corneal and scleral collagen fibrils contained subfibrils running helicoidally in a rightward direction to the longitudinal axis of the fibril; the inclination angle was about 15° in the corneal fibrils and 5° in the scleral fibrils. These findings indicate that the different D-periodicity between corneal and scleral fibrils depends on the different inclinations of the subfibrils in each fibril. The present study thus showed that corneal collagen fibrils differ from scleral collagen fibrils not only in diameter but also in substructure.
著者
KIDA Yujiro ASAHINA Kinji INOUE Kouji KAWADA Norifumi YOSHIZATO Katsutoshi WAKE Kenjiro SATO Tetsuji
出版者
International Society of Histology and Cytology
雑誌
Archives of histology and cytology (ISSN:09149465)
巻号頁・発行日
vol.70, no.2, pp.95-106, 2007-06-30
被引用文献数
8

The expression of the cytoglobin/stellate cell activation-associated protein (Cygb/STAP) was recently confirmed in all splanchnic vitamin A-storing cells - including hepatic stellate cells (HSCs) - in normal conditions. In the hepatic fibrous lesion, the expression of Cygb/STAP has been shown to be upregulated in activated HSCs and myofibroblasts (MFs), which have synthesized extracellular matrices. Furthermore, splanchnic vitamin A-storing cells have been reported to be distributed in the kidney. In this study, we clarify the contribution of vitamin A-storing cells to renal fibrosis by focusing on Cygb/ STAP. Adult mice were subjected to unilateral ureteral obstruction (UUO) and kidneys were harvested 1, 3, 7, and 10 days after UUO.<BR> Numbers of Cygb/STAP-immunopositive cells as well as Cygb/STAP mRNA 3 days after UUO (UUO day 3 kidney) increased. Vitamin A-autofluorescence was observed in intertubular spaces of controls but gradually declined in a time-dependent manner after UUO. Cygb/STAP<SUP>+</SUP> cells were not completely identical with α-smooth muscle actin (αSMA)-positive cells in the control or UUO day 7 kidneys. Immunohistochemical analysis for Cygb/STAP and fibulin-2 (Fib), a specific marker for distinguishing MFs from activated HSCs, revealed that the number of Fib<SUP>+</SUP>STAP<SUP>+</SUP> cells (MFs) and Fib-STAP<SUP>+</SUP> cells (splanchnic vitamin A-storing cells) significantly increased in UUO day 3 and UUO day 7 kidneys compared with the controls. Our present findings support the concept that Cygb/STAP can be a unique marker for splanchnic fibroblast-like cells, namely the vitamin A-storing cell lineage, and suggest that splanchnic vitamin A-storing cells contribute to renal fibrogenesis in the obstructed kidney.