Effects of environmental pollution on the liver parenchymal cells and Kupffer-melanomacrophagic cells of the frog Rana esculenta.
In vertebrates, the biotransformation processes of xenobiotics are performed mainly by the liver which involves both hepatocytes and Kupffer-melanomacrophagic cells through enzymatic and nonenzymatic mechanisms. In this study, we investigated the liver of Rana esculenta adult frogs collected at two sample rice fields, one heavily polluted and one relatively unpolluted. Water pollution was determined by chemical analysis on tadpoles. The specific activities of some enzymes (glucose-6-phosphate dehydrogenase (G6PDH), acid and alkaline phosphatases (AcPase and AlkPase), succinic dehydrogenase (SDH), and catalase) were studied in the liver of adult frogs to identify the possible changes induced by contamination in the metabolic processes which depend on the function of the liver. The production of reactive oxygen species (ROS) were also evaluated through histochemical techniques. In the polluted samples, hepatocytes showed variations in the activity of G6PDH, AlkPase, and SDH and a moderate to intense ROS expression. Prominent changes were observed in Kupffer cells (KCs) and melanomacrophages (MMPs), both showing intense reactivity for AcPase and catalase and variations in melanin content and distribution. Results thus indicate a general adaptive response of liver parenchyma to environmental pollution. The possible role of both KCs and MMPs as scavengers of foreign substances is discussed.
Fenoglio
Carla
C
Lab. Anatomia Comparata, Dipartimento di Biologia Animale, Università di Pavia, Piazza Botta 10, 27100 Pavia, Italy. fenoglio@unipv.it
Boncompagni
Eleonora
E
Fasola
Mauro
M
Gandini
Carlo
C
Comizzoli
Sergio
S
Milanesi
Gloria
G
Barni
Sergio
S
D000135:Acid Phosphatase / Q000378:metabolism; D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D002374:Catalase / Q000378:metabolism; D004781:Environmental Exposure; D004784:Environmental Monitoring; D005952:Glucose-6-Phosphatase / Q000378:metabolism; D022781:Hepatocytes / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D006651:Histocytochemistry; D007728:Kupffer Cells / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D007814:Larva / Q000737:chemistry / Q000187:drug effects; D008099:Liver / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D008543:Melanins / Q000378:metabolism; D011893:Rana esculenta; D017382:Reactive Oxygen Species / Q000378:metabolism; D013385:Succinate Dehydrogenase / Q000378:metabolism; D014131:Trace Elements / Q000032:analysis; D014876:Water Pollution / Q000032:analysis
D008543:Melanins; D017382:Reactive Oxygen Species; D014131:Trace Elements; D002374:Catalase; D013385:Succinate Dehydrogenase; D000469:Alkaline Phosphatase; D000135:Acid Phosphatase; D005952:Glucose-6-Phosphatase