title: Immunohistochemical and histoplanimetrical study on the endothelial receptor involved in transportation of minute chylomicrons into subepithelial portal blood in intestinal villi of the rat jejunum.
abstract: A portion of the minute chylomicrons less than 75 nm in diameter are transcytosed from the extravascular tissue into the subepithelial blood capillaries (sBC) in the villous apices of the rat jejunum. However, the details of the transportation mechanism have not been clarified. In this study, the endothelial receptor involved in the transportation of minute chylomicrons into the sBC's lumina was immunohistochemically and histoplanimetrically examined in intestinal villi of the rat jejunum. Immunopositivity for very low density lipoprotein (VLDL) receptor was detected on the luminal and basal surfaces of the endothelial cells of sBC in approximately 68% of those apices of jejunal villi that possessed numerous chylomicrons in the lamina propria, while VLDL receptor was detected on the endothelial cells of sBC in only approximately 8% of intestinal villi that possessed few or no chylomicrons in the lamina propria. No immunopositivity for LDL receptor was detected in the sBC of all intestinal villi. These findings suggest that VLDL receptor is expressed by the endothelial cells of the sBC in conjunction with the filling of the lamina propria of jejunal villi with many chylomicrons produced by the villous columnar epithelial cells and that the VLDL receptor mediates the transportation of minute chylomicrons, maybe VLDL, into the subepithelial portal blood from the extravascular tissue of the rat jejunal villi.
authors.affiliation: Laboratory of Histophysiology, Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo 657-8501, Japan.
authors.forename: Ei-ichirou
authors.initials: E
authors.lastname: Takahara
authors.forename: Hideto
authors.initials: H
authors.lastname: Yuasa
authors.forename: Miho
authors.initials: M
authors.lastname: Nishida
authors.forename: Youhei
authors.initials: Y
authors.lastname: Mantani
authors.forename: Kankanam Gamage Sanath
authors.initials: KG
authors.lastname: Udayanga
authors.forename: Wang-Mei
authors.initials: WM
authors.lastname: Qi
authors.forename: Takashi
authors.initials: T
authors.lastname: Takeuchi
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Yokoyama
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Hoshi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kitagawa
mesh_terms: D000818:Animals; D001692:Biological Transport / Q000502:physiology; D002352:Carrier Proteins / Q000378:metabolism*; D002914:Chylomicrons / Q000378:metabolism*; D006652:Histological Techniques; D007150:Immunohistochemistry; D007408:Intestinal Absorption / Q000502:physiology*; D007583:Jejunum / Q000502:physiology*; D008297:Male; D051381:Rats; D011973:Receptors, LDL / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; D002914:Chylomicrons; D011973:Receptors, LDL; C036053:VLDL receptor