Histology of the liver of Oligosarcus jenynsii (Ostariophysi, Characidae) from Los Padres Lake, Argentina

Abstract

ABSTRACT. The liver is an organ notable for its sensitivity to a great variety of environmental factors. It is composed of a parenchyma divided into irregular lobules by the exocrine pancreas or hepatopancreas; the pancreatic cells are arranged around a branch of the portal vein. The hepatocytes are radially arranged in cords around a central sinusoid. The liver histomorphology and the organization of exocrine pancreatic tissue of O. jenynsii (Günther, 1864) is similar to the acinar morphology of many teleosts, including freshwater and marine species. The aim of the present work was to carry out the histological analysis of the liver of Oligosarcus jenynsii, one of the most common species inhabiting Los Padres Lake (Buenos Aires Province, Argentina). KEYWORDS.Liver, histology, characid, freshwaters.Departamento de Biología, Facultad de Ciencias Exactas y Naturales, UNMdP, Funes 3250, 3º piso, (B7602AYJ) Mar del Plata, Argentina. (gpetcoff@mdp.edu.ar) The liver is a mixed gland surrounded by a thin capsule of connective tissue, the Glisson capsule, dividing the parenchyma into lobules and lobuli. The histological unity of the liver is composed of the liver lobuli, with classic, portal and acini conceptions. The liver has two types of irrigation: one constituted by the hepatic artery, which provides arterial blood to the gland, and the other derived from the portal vein, carrying blood from the esophagic and gastrointestinal tracts, from spleen and pancreas (ROSS et al., 2003).In vertebrates, the liver has a primary array based on hepatocytes, bile canaliculi and sinusoids, and structural differences occur among species in stroma and parenchyma three-dimensional organization.Three patterns of organization of vertebrate hepatic parenchyma have been described by EURELL & HAENSLY (1982): 1) the first pattern of hepatic parenchyma arrangement consists of hepatocytes, which are radially arranged around a central vein in interconnecting laminae of two cells thickness, sinusoids separating each lamina. Bile canaliculi are located between adjacent hepatocytes. This pattern corresponds to the muralium or trabecular type, originally established by ELÍAS & BENGELSDORF (1952) for birds and mammals; 2) in the second pattern, sinusoids form an extensive network around the periphery of hepatocytes tubules. A bile canaliculus forms the center of the tubule. This pattern has been described in the " hagfish" Myxine glutinosa (MUGNAINI & HARBOE, 1967); 3) hepatocytes are arranged in anastomosed laminae around the central vein. The bile canaliculi are intracellular (LANGER, 1979;CHAPMAN, 1981). This pattern has been established in teleost fish following the classic tubular pattern.As teleostean hepatic organization is concerned, several microscopic anatomy and histochemistry studies have been done on the liver of marine species, such as the hake Merluccius hubbsi, the white croaker Micropogonias furnieri, and the stripped weakfish Cynoscion guatucupa (DÍAZ et al., 1999). Among freshwater species, the histology and ultrastructure ...

Transmission Electron Microscopy of the Gastrointestinal Tract of Nile Perch Lates niloticus

“…10). Similar cells have been reported in Pangasius sanitwongsei (Sayrafi et al, 2011) and Oligosarcus jenynsii (Petcoff et al, 2006), where the liver occurs together with the pancreas to form a hepatopancreas.…”

Histopathological analysis of liver of the catfish <i>Pimelodus maculatus</i> in a tropical eutrophic reservoir from Southeastern Brazil

“…In our investigation, the hepatopancreas was found for P. maculatus, being distinguished from the hepatic parenchyma by a thin layer of connective tissue. However, pancreatic tissue inside the liver is not present in all kinds of fish (Petcoff, Diaz, Escalante, & Goldenberg, 2006;El-Bakary & El-Gammal, 2010). The exocrine pancreatic tissue is formed around the portal vein, and during ontogenesis it penetrates deeply into the liver parenchyma (Vicentini et al, 2005), while its proportion depends on the species of fish (Gonzalez, Crespo, & Brusle, 1993).…”

Morphology and Histochemistry of the Liver of Carnivorous Fish Hemisorubim platyrhynchos

“…The hepatocytes of H. platyrhynchos are polygonal and present basal nucleus and apical cytoplasm with few glycogen granules but large amount of lipids, similar to observed in Sparus aurata (El-Bakary & El-Gammal, 2010). In Oligosarcus jenynsii, Petcoff et al (2006), observed that the hepatocytes are polyhedral cells with spherical nucleus and according to Bucke et al (1984), these cells are specialized in the accumulation of reserve substances, mainly glycogen and lipids. Alongside the hepatocytes cords of H. platyrhynchos, sinusoids containing blood plasma converge on the centerlobular vein.…”