Ultrastructural Demonstration of the Absorption and Transportation of Minute Chylomicrons by Subepithelial Blood Capillaries in Rat Jejunal Villi
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概要
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Chylomicrons from villous columnar epithelial cells are generally known to be transported only by central lymph vessels (CLV), whereas antigenic particulates derived from the intestinal lumen can also be transported by subepithelial blood capillaries (sBCs) in rat intestinal villi. The possibility of chylomicron absorption by sBCs was histoplanimetrically studied in the rat jejunum under a transmission electron microscope. The chylomicrons more abundantly presented in villous venules than in arterioles. The most frequent size (MFS) of chylomicrons was 75 to 90 nm in diameter in the areas near sBCs, while it was 45 to 60 nm in the epithelial intercellular spaces just above sBCs or the intermediate areas between sBCs. The MFS of chylomicrons was 45 to 60 nm in the intermediate areas between sBCs and in the epithelial intercellular spaces just above these areas. The MFS of chylomicrons in CLV was intermediate between that in the area adjacent to sBCs and that in the intermediate areas between sBCs. Chylomicrons were found in small vesicles in the endothelial cytoplasms of sBCs. No chylomicrons larger than 600 nm were observed in the lamina propria. These findings suggest that some of the chylomicrons smaller than 75 nm, which are probable intestinal very low-density lipoproteins (VLDL), are directly transported to the liver by hepatic portal blood in addition to CLV and that epithelial fat droplets larger than 600 nm are not discharged into lamina propria in rat jejunum under physiological conditions.
著者
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Yokoyama Toshifumi
Department Of Anatomy And Neurobiology Faculty Of Medicine Kagawa University
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Takeuchi Takashi
Department Of Chemical Engineering Science Yokohama National University
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Kitagawa Hiroshi
Department Of Adaptive Machine Systems Graduate School Of Engineering Osaka University
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Hoshi Nobuhiko
Department Of Animal Science Graduate School Of Agricultural Science Kobe University
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QI Wang-Mei
Department of Based Veterinary Medicine, College of Veterinary Medicine, Inner Mongolia Agricultural University
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MANTANI Youhei
Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University
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TAKAHARA Ei-ichirou
Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University
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UDAYANGA Kankanam
Department of Bioresource Science, Graduate School of Agricultural Science, Graduate School of Science and Technology, Kobe University
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TANIDA Takashi
Department of Anatomy and Neurobiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602–8566, Japan
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