DOCSLIB.ORG

Experimentally Impeded Are Described. Vision

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Experimentally Impeded Are Described. Vision Br. J. exp. Path. (1976) 57, 604 EFFECT OF HEPATIC VENOUS OUTFLOW OBSTRUCTION ON PORES AND FENESTRATIONS IN SINUSOIDAL ENDOTHELIUM* W. NOPANITAYA, J. C. LAMB, J. W. GRISHAMI AND J. L. CARSON Fromn the Department of Pathology, School of MIedicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514 Received( for publication Junie 15, 1976 Summary.-The ultrastructure of pores and fenestrations in hepatic sinusoidal endothelial cells was examined following partial surgical occlusion of the supra- hepatic portion of the inferior vena cava. Within 12 h after partial obstruction of hepatic venous outflow, endothelial pores ( < 0-1 [km in diameter) and sieve plates in the distal halves of sinusoids were greatly reduced in number or were totally absent, and they were replaced by large fenestrations ( < 1 0 um in diameter). These results suggest that pores forming sieve plates may fuse to form large fenestrations. The findings also indicate that sinusoidal hypertension and hypoxia associated with obstruction of hepatic venous outflow alter the distribution of pores and fenestrations in sinusoidal endothelium. THE ultrastructure of hepatic sinusoidal MATERIALS AND METHODS endothelial cells of several species recently Experiments were carried out oni female has been established by studies employing Wlistar albino rats. The animals were retired transmission (TEM) and scanning (SEM) breeders weighing approximately 325 g. They electron microscopy (Fawcett, 1955; Bruni were kept in wire bottom cages and fed Purina laboratory chow and tap water ad libitum for at and Porter, 1965; Wisse, 1970; Orci, least 3 weeks before being used for this study. Matter and Rouiller, 1971; Ogawa et al., All animals were anaesthetized by injecting 1973; Brooks and Haggis, 1973; Motta and sodium pentobarbital (5 mg/100 g body weight) Porter, 1974; Motta, 1975; Grisham et al., i.p. and laparotomy was performed to expose the 1975; Nopanitaya and Grisham, 1975). inferior vena cava between the liver and the diaphragm. To produice a consistent partial The cytoplasm of sinusoidal endothelial occluision of the vena cava in the experimental cells is penetrated by a large number of group of rats, a probe 2 mm in diameter was pores and fenestrations, allowing direct placed parallel to the vena cava and a 4-0 suture access of the fluid contents of the blood to was slipped around both the probe and vena cava juist above the entrance of the hepatic the sinusoidal surface of underlying veins. The suture was securely tied and the hepatocytes. The differential physiologic probe was removed to partially restore the functions of endothelial pores and fenes- lumen- of the vena cava. Sham-operated rats trations, if any, is not clear. This study (controls) underwent laparotomy and the vena represents an attempt to assess the effect cava was manipulated buit the vessel was not occluided. of experimentally altering the character- Thiree animals from both control and istics of blood flow and the contents of experimental grouips were killed 12, 24, 48 and blood on the ultrastructure of sinusoidal 72 h after operation. At each interval, the endothelium. The effects on the ultra- intrahepatic sinusoidal blood pressure was and estimated by the measurement of splenic structure of endothelial pores fenes- sinuisoidal pressure throuigh a 20-gauge needle trations when hepatic venous outflow is iniserted iinto the splenic pulp under direct experimentally impeded are described. vision. The splenic sinusoidal pressure was * Supporte(d by Grant VC595 from the UNC Res('arch Council, training grant GM\ 92 from the National Institute of General Meolical Sciences, an(d research grant AML 17595 from the National Institute of Arthritis, Metabolic and Digestive Diseases. EFFECT OF HEPATIC VENOUS OUTFLOW OBSTRUCTION 605 FIG. 1. Liver of a sham-operated rat showing normal appearance of sinusoids and terminal hepatic vein (V). Haematoxylin and eosin. x 125. FIG. 2. Liver from rat in which the vena cava was partially occluded for 48 h. The terminal hepatic veini (V) and its surrounding sinusoids are greatly dilated. Haematoxylin and eosin. x 125. recorded on a Grass Model 7C polygraph Prior to perfusion, livers of all experi- employing a Statham Model P23DC transducer. mental animals, in contrast to livers of Livers from all animals were fixed by perfusion with 4% phosphate-buffered para- sham-operated rats, appeared finely formaldehyde at pH 7-3. After fixation, pieces reticulated through the capsule with of liver were manually fractured and treated for alternating dark red and pale areas. SEM by a technique described by Grisham et al. Spleens of treated animals were enlarged (1975). Specimens of the liver were also Light microscopic prepared for light microscopy and transmission and congested. electron microscopy by conventional tech- examination of histologic sections of niques. SEM and TEM study of endothelium livers stained with haematoxylin and concentrated on the distal one-half of sinusoids, eosin demonstrated that terminal hepatic since this region is normally populated by pores veins and the surrounding sinusoids were alone (Grisham et al., 1975). greatly dilated (Fig. 1, 2). Hepatic plates in the region of terminal hepatic veins RESULTS were markedly thinned, and focally some The intrasplenic pressure of 3 sham- hepatocytes in these areas appeared to be operated rats was 20-0 ± 1-0 mm Hg, dead. Occasional focal accumulations of while that of 12 rats whose suprahepatic polymorphonuclear leucocytes signalled vena cavae had been partially obstructed the location of necrotic hepatocytes. was 248 ± 0-1 mm Hg. This difference These pathological alterations were some- was statistically significant (P < 0-001). what less pronounced in rats killed 12 h The intrasplenic pressure did not vary after partial occlusion of the vena cava between 12 and 72 h following partial than in the animals killed at later intervals, occlusion of the vena cava. but no difference could be discerned 606 W. NOPANITAYA, J. C. LAMB, J. W. GRISHAM AND J. L. CARSON FIG. 3. Surface structure of hepatic parenchyma from a sham-operated rat illustrating normal features of sinusoids (S) bordering hepatic plates (HP) that are the width of single hepatocytes. Scaining electron photo-micrograph. x 1,857. FIG. 4. Following 48 h of hepatic venous obstruction sinusoids (S) are greatly dilated and hepatic plates (HP) are narrowed. Scanning electron micrograph. x 1,875. between livers from animals killed at any greatly dilated, measuring up to 150 ,um of the later time intervals. in diameter (normal: 20-40 1tm) (Fig. 3, 4) Regardless of the postoperative inter- Sieve plates composed of 10 to 50 pores, val, SEM demonstrated that hepatic each less than 0.1 ,pm in diameter, were sinusoids of experimental animals were prominent in endothelium in efferent EFFECT OF HEPATIC VENOUS OUTFLOW OBSTRUCTION 607 FIG. 5.-Pores and fenestrations in a sinusoidal endothelial cell from the liver of a sham-operated rat. A few large fenestrations (F) are randomly interspersed among smaller pores which are grouped into sieve plates. Scanning electron micrograph. x 6,750. FIG. 6.-Enlarged fenestrations (F) in an endothelial cell from a rat liver 48 h following partial occlusion of the vena cava. Microvilli on the sinusoidal surface of the underlying hepatocyte are visible through these large fenestrations. Pores and sieve plates are not present. Scanning electron micrograph. x 6,750. FIG. 7.-Ultrastructure of portions of the adjacent sinusoidal endothelial cell and an hepatocyte 48 h after partial occlusion of the inferior vena cava. Large fenestrations (open arrow) in the sinusoidal endothelial cell are apparent. Invaginations of plasma membrane (*) into the cytoplasm of the hepatocyte produce the appearance of vacuoles on cross-section. Transmission electron micro- graph. x 15,000. 608 W. NOPANITAYA, J. C. LAMB, J. W. GRISHAM AND J. L. CARSON halves of sinusoids of sham-operated rats, interrelated. Because sieve plates and but large fenestrations (about 1-0 jtm) large fenestrations occupy about the same were sparse (Fig. 5). Obstruction of the area, we have suggested that fenestrations vena cava, even as soon as 12 h after may be formed when all of the pores in a surgery, was associated with the occur- sieve plate coalesce (Nopanitaya and rence of large fenestrations 2 to 5 ,tm in Grisham, 1975). The study reported in diameter in endothelium in the efferent this paper represents an initial attempt to halves of sinusoids, with a marked investigate this potential relationship and, reduction or absence of pores and sieve more importantly, to develop insights into plates (Fig. 6). Through the large the pathophysiologic functions of pores fenestrae the sinusoidal surfaces of under- and fenestrations. lying hepatocytes were visible (Fig. 6). This study indicates that obstruction During the next 60 h after surgery these to hepatic venous outflow is associated ultrastructural alterations did not vary with a marked change in the distribution greatly. TEM of thin sections corro- of pores and fenestrations in sinusoidal borated these changes in sinusoidal endothelium of rat liver. The degree of endothelium. Wide gaps separated occlusion of the suprahepatic inferior vena adjacent profiles of sectioned endothelium cava obtained was sufficient to cause (Fig. 7). Additionally, the underlying severe hepatic sinusoidal congestion, intra- hepatocytes showed deep invaginations of hepatic and portal hypertension (as the surface membrane, which in cross-
Load more

Recommended publications
  • Engineered Liver-On-A-Chip Platform to Mimic Liver Functions and Its Biomedical Applications: a Review
    micromachines Review Engineered Liver-On-A-Chip Platform to Mimic Liver Functions and Its Biomedical Applications: A Review 1, 1, 2, 1, 1 Jiu Deng y, Wenbo Wei y, Zongzheng Chen y , Bingcheng Lin *, Weijie Zhao , Yong Luo 1 and Xiuli Zhang 3,* 1 State Key Laboratory of Fine Chemicals, Department of Chemical Engineering, Dalian University of Technology, Dalian 116024, China; [email protected] (J.D.); [email protected] (W.W.); [email protected] (W.Z.); [email protected] (Y.L.) 2 Integrated Chinese and Western Medicine Postdoctoral research station, Jinan University, Guangzhou 510632, China; [email protected] 3 College of Pharmaceutical Science, Soochow University, Suzhou 215123, China * Correspondence: [email protected] (B.L.); [email protected] (X.Z.); Tel.: +86-0411-8437-9065 (B.L.); +86-155-0425-7723 (X.Z.) These authors have equally contribution to this work. y Received: 17 September 2019; Accepted: 3 October 2019; Published: 7 October 2019 Abstract: Hepatology and drug development for liver diseases require in vitro liver models. Typical models include 2D planar primary hepatocytes, hepatocyte spheroids, hepatocyte organoids, and liver-on-a-chip. Liver-on-a-chip has emerged as the mainstream model for drug development because it recapitulates the liver microenvironment and has good assay robustness such as reproducibility. Liver-on-a-chip with human primary cells can potentially correlate clinical testing. Liver-on-a-chip can not only predict drug hepatotoxicity and drug metabolism, but also connect other artificial organs on the chip for a human-on-a-chip, which can reflect the overall effect of a drug.
    [Show full text]
  • Nomina Histologica Veterinaria, First Edition
    NOMINA HISTOLOGICA VETERINARIA Submitted by the International Committee on Veterinary Histological Nomenclature (ICVHN) to the World Association of Veterinary Anatomists Published on the website of the World Association of Veterinary Anatomists www.wava-amav.org 2017 CONTENTS Introduction i Principles of term construction in N.H.V. iii Cytologia – Cytology 1 Textus epithelialis – Epithelial tissue 10 Textus connectivus – Connective tissue 13 Sanguis et Lympha – Blood and Lymph 17 Textus muscularis – Muscle tissue 19 Textus nervosus – Nerve tissue 20 Splanchnologia – Viscera 23 Systema digestorium – Digestive system 24 Systema respiratorium – Respiratory system 32 Systema urinarium – Urinary system 35 Organa genitalia masculina – Male genital system 38 Organa genitalia feminina – Female genital system 42 Systema endocrinum – Endocrine system 45 Systema cardiovasculare et lymphaticum [Angiologia] – Cardiovascular and lymphatic system 47 Systema nervosum – Nervous system 52 Receptores sensorii et Organa sensuum – Sensory receptors and Sense organs 58 Integumentum – Integument 64 INTRODUCTION The preparations leading to the publication of the present first edition of the Nomina Histologica Veterinaria has a long history spanning more than 50 years. Under the auspices of the World Association of Veterinary Anatomists (W.A.V.A.), the International Committee on Veterinary Anatomical Nomenclature (I.C.V.A.N.) appointed in Giessen, 1965, a Subcommittee on Histology and Embryology which started a working relation with the Subcommittee on Histology of the former International Anatomical Nomenclature Committee. In Mexico City, 1971, this Subcommittee presented a document entitled Nomina Histologica Veterinaria: A Working Draft as a basis for the continued work of the newly-appointed Subcommittee on Histological Nomenclature. This resulted in the editing of the Nomina Histologica Veterinaria: A Working Draft II (Toulouse, 1974), followed by preparations for publication of a Nomina Histologica Veterinaria.
    [Show full text]
  • Analysis of the Sinusoidal Endothelial Cell Organization During The
    CELL STRUCTURE AND FUNCTION 23: 341-348 (1998) © 1998 by Japan Society for Cell Biology Analysis of the Sinusoidal Endothelial Cell Organization during the Develop- mental Stage of the Fetal Rat Liver Using a Sinusoidal Endothelial Cell Specific Antibody, SE-1 Mamoru Morita1, Wang Qun2, Hitoshi Watanabe1, Yuko Doi1, Michio Mori3, and Katsuhiko Enomoto1'* department of Pathology, Akita University School of Medicine, Hondo, Akita 010-8543, Japan, depart- ment of Pathology, School of Basic Medicine, NormanBethune University of Medical Science, Jilin, P.R. of China, and *Department of Pathology, Sapporo Medical University School of Medicine, S-l, W-17, Chuo-ku, Sapporo 060, Japan Keywords: sinusoidal endothelial cells/SE-1 antibody/fetal rat liver ABSTRACT.The sinusoid organization during the development of fetal rat livers was studied using a SE-1 antibody, which we have previously established as a specific monoclonal antibody against rat sinusoidal endo- thelial cell (SEC). Expression and localization of the SE-1 antigen in the liver tissues of 13- to 21-day-old fe- tuses were immunofluorescently and immunoelectron microscopically examined. The first positive fluorescence was observed in the immature liver of 15-day-old fetuses. The initial positive staining was randomly distrib- uted in the liver parenchyma and showed no direct relation to the large vessels which may be derived from the fetal vitelline veins. The positive linear staining increased in number and connected with each other during the course of development. The SE-1 staining pattern and the sinusoidal arrangement became similar to those of the adult liver after 20th day of gestation. Immunoelectron microscopically, the immature SEC showed a weak positive reaction for the SE-1 antigen at their membraneand was observed together with immature hepato- cytes and hematopoietic cells in the 15-day-old fetal liver.
    [Show full text]
  • Title of My Thesis
    Development of an in vitro 3D Printed Liver Sinusoid Model Soumya Sethi A Dissertation Submitted to Indian Institute of Technology Hyderabad In Partial Fulfillment of the Requirements for The Degree of Master of Technology Department of Biomedical Engineering June, 2018 Declaration I declare that this written submission represents my ideas in my own words, and where others’ ideas or words have been included, I have adequately cited and referenced the original sources. I also declare that I have adhered to all principles of academic honesty and integrity and have not misrepresented or fabricated or falsified any idea/data/fact/source in my submission. I understand that any violation of the above will be a cause for disciplinary action by the Institute and can also evoke penal action from the sources that have thus not been properly cited, or from whom proper permission has not been taken when needed. (Signature) Soumya Sethi BM16MTECH11007 (Roll No) ii Approval Sheet iii Acknowledgements I would like to thank my thesis supervisor Dr Falguni Pati for his continuous guidance. I would also like to thank my lab members especially Shibu Chameettachal, Shyama Sasikumar, Sriya for supporting me and helping me out whenever required. They have been a continuous source of inspiration for me, without their passionate participation and inputs, the project could not have been successfully conducted. iv Abstract Liver is one of the most remarkable organs of the human body as it performs various vital functions namely metabolism of fats and carbohydrates, drugs, detoxification, production of bile and has a capacity to regenerate. The intricate functional units of the liver called the sinusoids are of immense interest as they are early targets of many drugs and toxicants as well as have been reported to play a significant role in initiating liver regeneration and contribute to the pathophysiology of many liver diseases.
    [Show full text]
  • Elimination Pathways of Nanoparticles † ‡ † ‡ ◆ † ‡ § ◆ † ‡ † ‡ Wilson Poon, , Yi-Nan Zhang, , , Ben Ouyang, , , , Benjamin R
    Article Cite This: ACS Nano 2019, 13, 5785−5798 www.acsnano.org Elimination Pathways of Nanoparticles † ‡ † ‡ ◆ † ‡ § ◆ † ‡ † ‡ Wilson Poon, , Yi-Nan Zhang, , , Ben Ouyang, , , , Benjamin R. Kingston, , Jamie L. Y. Wu, , ∥ ⊥ † ‡ # ∇ ○ Stefan Wilhelm, , and Warren C. W. Chan*, , , , , † Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G9, Canada ‡ Terrence Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Ontario M5S 3E1, Canada § MD/PhD Program, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada ∥ Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States ⊥ Stephenson Cancer Center, Oklahoma City, Oklahoma 73104, United States # Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 3E5, Canada ∇ Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario M5S 1A1, Canada ○ Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada *S Supporting Information ABSTRACT: Understanding how nanoparticles are eliminated from the body is required for their successful clinical translation. Many promising nanoparticle formulations for in vivo medical applications are large (>5.5 nm) and nonbiodegradable, so they cannot be eliminated renally. A proposed pathway for these nanoparticles is hepatobiliary from https://pubs.acs.org/doi/10.1021/acsnano.9b01383. elimination, but their transport has
    [Show full text]
  • The Influence of Chronic Liver Diseases on Hepatic Vasculature
    micromachines Review The Influence of Chronic Liver Diseases on Hepatic Vasculature: A Liver-on-a-chip Review Alican Özkan 1,* , Danielle Stolley 2, Erik N. K. Cressman 3 , Matthew McMillin 4,5 , Sharon DeMorrow 4,5,6 , Thomas E. Yankeelov 2,7,8,9,10 and Marissa Nichole Rylander 1,2,7 1 Department of Mechanical Engineering, The University of Texas, Austin, TX 78712, USA; [email protected] 2 Department of Biomedical Engineering, The University of Texas, Austin, TX 78712, USA; [email protected] (D.S.); [email protected] (T.E.Y.) 3 Department of Interventional Radiology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; [email protected] 4 Department of Internal Medicine, Dell Medical School, The University of Texas at Austin, Austin, TX 78713, USA; [email protected] (M.M.); [email protected] (S.D.) 5 Central Texas Veterans Health Care System, Temple, TX 76504, USA 6 Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Austin, TX 78712, USA 7 Oden Institute for Computational Engineering and Sciences, The University of Texas, Austin, TX 78712, USA 8 Departments of Diagnostic Medicine, The University of Texas, Austin, TX 78712, USA 9 Department of Oncology, The University of Texas, Austin, TX 78712, USA 10 Livestrong Cancer Institutes, Dell Medical School, The University of Texas, Austin, TX 78712, USA * Correspondence: [email protected]; Tel.: +1-512-806-9062 Received: 16 April 2020; Accepted: 4 May 2020; Published: 9 May 2020 Abstract: In chronic liver diseases and hepatocellular carcinoma, the cells and extracellular matrix of the liver undergo significant alteration in response to chronic injury.
    [Show full text]
  • Original Article Rat Liver Sinusoidal Dilatation Induced by Perfusion In
    Int J Clin Exp Med 2016;9(6):11284-11291 www.ijcem.com /ISSN:1940-5901/IJCEM0021986 Original Article Rat liver sinusoidal dilatation induced by perfusion in vitro through portal vein alone, hepatic artery alone, and portal vein together with hepatic artery Hefang Shen1, Jing Dong1, Lingling Xia2, Jianjian Xu3, Lili Xu1 1School of Basic Medical Science, Anhui Medical University, Hefei, Anhui 230032, People’s Republic of China; 2Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Anhui, People’s Republic of China; 3School of Medical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of China Received December 15, 2015; Accepted February 4, 2016; Epub June 15, 2016; Published June 30, 2016 Abstract: The techniques for liver perfusion have been recommended in order to protect liver grafts prior to trans- plantation. We compared portal vein alone, hepatic artery alone, and dual perfusion through portal vein together with hepatic artery perfusion techniques in rat livers analyzed in histology. Rat livers were treated for 30 min in situ warm ischemia and excised and directly placed to mimic conventional cold storage for 4 hours followed by different routes of cold perfusion. In three experimental groups, five livers were given portal vein perfusion in group one. In group two, five livers were subjected to hepatic artery perfusion and in group three five livers received both portal vein and hepatic artery perfusion. Histological samples were taken before the beginning of the perfusion, 30 min- utes, and 60 minutes after starting of the perfusion. Rat livers, received portal vein perfusion in group one, revealed remarkable sinusoidal dilatation increasingly with augmented perfusion time.
    [Show full text]
  • 26 April 2010 TE Prepublication Page 1 Nomina Generalia General Terms
    26 April 2010 TE PrePublication Page 1 Nomina generalia General terms E1.0.0.0.0.0.1 Modus reproductionis Reproductive mode E1.0.0.0.0.0.2 Reproductio sexualis Sexual reproduction E1.0.0.0.0.0.3 Viviparitas Viviparity E1.0.0.0.0.0.4 Heterogamia Heterogamy E1.0.0.0.0.0.5 Endogamia Endogamy E1.0.0.0.0.0.6 Sequentia reproductionis Reproductive sequence E1.0.0.0.0.0.7 Ovulatio Ovulation E1.0.0.0.0.0.8 Erectio Erection E1.0.0.0.0.0.9 Coitus Coitus; Sexual intercourse E1.0.0.0.0.0.10 Ejaculatio1 Ejaculation E1.0.0.0.0.0.11 Emissio Emission E1.0.0.0.0.0.12 Ejaculatio vera Ejaculation proper E1.0.0.0.0.0.13 Semen Semen; Ejaculate E1.0.0.0.0.0.14 Inseminatio Insemination E1.0.0.0.0.0.15 Fertilisatio Fertilization E1.0.0.0.0.0.16 Fecundatio Fecundation; Impregnation E1.0.0.0.0.0.17 Superfecundatio Superfecundation E1.0.0.0.0.0.18 Superimpregnatio Superimpregnation E1.0.0.0.0.0.19 Superfetatio Superfetation E1.0.0.0.0.0.20 Ontogenesis Ontogeny E1.0.0.0.0.0.21 Ontogenesis praenatalis Prenatal ontogeny E1.0.0.0.0.0.22 Tempus praenatale; Tempus gestationis Prenatal period; Gestation period E1.0.0.0.0.0.23 Vita praenatalis Prenatal life E1.0.0.0.0.0.24 Vita intrauterina Intra-uterine life E1.0.0.0.0.0.25 Embryogenesis2 Embryogenesis; Embryogeny E1.0.0.0.0.0.26 Fetogenesis3 Fetogenesis E1.0.0.0.0.0.27 Tempus natale Birth period E1.0.0.0.0.0.28 Ontogenesis postnatalis Postnatal ontogeny E1.0.0.0.0.0.29 Vita postnatalis Postnatal life E1.0.1.0.0.0.1 Mensurae embryonicae et fetales4 Embryonic and fetal measurements E1.0.1.0.0.0.2 Aetas a fecundatione5 Fertilization
    [Show full text]
  • Hepatic Sinusoidal Endothelial Cells 5
    CHAPTER 5 Hepatic Sinusoidal Endothelial Cells 5 Roman E. Perri, Vijay Shah 5.1 Development and Structure Hepatic sinusoidal endothelial cells (HSEC) are a morphologically distinct population of cells that form the lining of liver sinusoids. Features that dis- tinguish HSEC from endothelial cells in other or- gans and in larger liver vessels are the presence of multiple fenestrae throughout the cells and the lack of an underlying basement membrane [3, 7, 60, 72]. The sinusoids are positioned between hepato- cyte plates and initiate at the portal tract and termi- nate at the central vein. Sinusoids carry blood that converges in the liver from the portal venous sup- ply, as well as from the hepatic artery [76] (Fig. 5.1). Sinusoids are separated from adjacent hepatocytes by the perisinusoidal space, also known as the space of Disse. Due to their position, HSEC are the first cells in contact with blood flow into the sinusoids and serve to compartmentalize the vascular sinu- soidal channels from the hepatic parenchyma [60, 72]. The hepatic sinusoids range in diameter from Fig. 5.1. Vasculature architecture of the liver. Blood flow enters 4 µm near the portal triad to 5.5 µm near the cen- the liver via the portal vein (PVb) as well as the hepatic artery tral vein [30]. Because they are smaller than both (HAb). While portal blood enters directly into the sinusoids (S), red and white blood cells, there is distortion of both hepatic arterial blood perfuses into distinct anatomic locations cells and the sinusoids during passage of blood cells prior to re-entering the sinusoids.
    [Show full text]
  • Critical Role of LSEC in Post-Hepatectomy Liver Regeneration and Failure
    International Journal of Molecular Sciences Review Critical Role of LSEC in Post-Hepatectomy Liver Regeneration and Failure Maxime De Rudder 1, Alexandra Dili 1,2, Peter Stärkel 1,3 and Isabelle A. Leclercq 1,* 1 Laboratory of Hepato-Gastroenterology, Institute of Experimental and Clinical Research, UCLouvain, 1200 Brussels, Belgium; [email protected] (M.D.R.); [email protected] (A.D.); [email protected] (P.S.) 2 HPB Surgery Unit, Centre Hospitalier Universitaire UCL Namur, Site Mont-Godinne, 5530 Yvoir, Belgium 3 Department of Hepato-Gastroenterology, Cliniques Universitaires Saint-Luc, 1200 Brussels, Belgium * Correspondence: [email protected]; Tel.: +32-2-764-5273 Abstract: Liver sinusoids are lined by liver sinusoidal endothelial cells (LSEC), which represent approximately 15 to 20% of the liver cells, but only 3% of the total liver volume. LSEC have unique functions, such as fluid filtration, blood vessel tone modulation, blood clotting, inflammatory cell recruitment, and metabolite and hormone trafficking. Different subtypes of liver endothelial cells are also known to control liver zonation and hepatocyte function. Here, we have reviewed the origin of LSEC, the different subtypes identified in the liver, as well as their renewal during homeostasis. The liver has the exceptional ability to regenerate from small remnants. The past decades have seen increasing awareness in the role of non-parenchymal cells in liver regeneration despite not being the most represented population. While a lot of knowledge has emerged, clarification is needed regarding the role of LSEC in sensing shear stress and on their participation in the inductive phase of regeneration by priming the hepatocytes and delivering mitogenic factors.
    [Show full text]
  • Hepatic Artery
    Ingegneria delle tecnologie per la salute Fondamenti di anatomia e istologia aa. 2019-20 Lesson 7. Digestive system and peritoneum Liver • hepatic artery delivers oxygenated blood from heart to liver, hepatic portal vein delivers partially deoxygenated blood containing nutrients (+ drugs and toxins) absorbed from the small intestine and actually supplies more oxygen to liver than do much smaller hepatic arteries; after processing bloodborne nutrients and toxins, liver releases nutrients needed by other cells back into the blood, which drains into central vein and then through hepatic vein to inferior vena cava. • hepatic portal circulation = all blood from alimentary canal passes through liver (explaining liver most common site for alimentary canal cancers metastasis) Liver: Histology = 3 main components: 1 hepatocytes [liver’s main cell type, accounting for around 80% of liver's volume, playing a role in a wide variety of secretory, metabolic, and endocrine functions; plates of hepatocytes called hepatic laminae radiate outward from portal vein in each hepatic lobule] = from their central position, hepatocytes process nutrients, toxins, and waste materials carried by blood: materials such as bilirubin processed and excreted into bile canaliculi, other materials including proteins, lipids, and carbohydrates processed and secreted into sinusoids or just stored in cells until called upon. Liver: Histology = 3 main components: 2 bile canaliculi [grooves in cell membranes between adjacent hepatocytes accumulating bile produced by hepatocytes:
    [Show full text]
  • The Development of Hepatic Sinusoids in Mouse Embryos
    86 Erika Awata, Akina Chiba, Chisato Yui and Shigeki Hirano 形態・機能 第 11 巻第 2 号 <Original> The Development of Hepatic Sinusoids in Mouse Embryos Erika Awata1), Akina Chiba2)*, Chisato Yui1) and Shigeki Hirano1) 1) ‌Department of Medical Technology, Graduate School of Health Sciences, Niigata University, Niigata, Japan 2) ‌Division of Gross Anatomy and Morphogenesis, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan (Received:25 May 2012, Accepted:23 August 2012) Abstract The development of hepatic sinusoids is only partially understood. This study investigated the development of hepatic sinusoids in order to clarify the formation process of sinusoidal endothelium by focusing on mouse tissue during a period of active liver hematopoiesis (E11-E16) using hematoxylin and eosin staining on paraffin-embedded liver sections, and toluidine blue staining on epoxy resin- embedded semi-thin sections. Flat cells lining the luminal surface of hepatic sinusoids were identified as endothelial cells with CD-146 immunohistochemical staining. We observed that developing sinusoids had partially naked walls that were not lined by flat cells, and from that hematopoietic cells and/or hepatic cells protruded into the sinusoidal lumen. In addition, CD-146 positive round cells scattering among hematopoietic cells and hepatic cells were observed. These observations suggest that hepatic sinusoids do not arise from the sprouting of intrahepatic capillary vessels but appear to be formed by CD-146 positive endothelial progenitor cells. Key words fetal mouse liver; sinusoid development; endothelial progenitor cells; CD-146 Introduction vascular system in liver, especially its sinusoidal Most liver functions, including the synthesis development, is poorly understood. and excretion of bile, the storage and supply of As the liver develops, intrahepatic capillary energy, and the metabolism and detoxification vessels that are directly connected to the ductus of various substances, arise gradually during venosus1, 2) can be observed in the primitive liver development.
    [Show full text]