title: Function of the liver and bile ducts in humans exposed to lead.
abstract: Lead is very common in the environment, and it is therefore important to characterize its possible adverse health effects. The aim of this study was to evaluate the impact of lead exposure on selected functions of the liver and bile ducts in people who are chronically exposed to the metal because of their occupations. To provide this information, the activity of specific enzymes and the bilirubin concentration were determined in blood serum, and morphological parameters of the liver and bile ducts were evaluated using the ultrasonic imaging method. Healthy male employees of a lead-zinc processing facility (n = 145) who were occupationally exposed to lead were divided into two subgroups as a function of the lead concentrations in blood (PbB): low lead exposure (PbB = 20-35 μg/dl; n = 57) and high lead exposure (PbB = 35-60 μg/dl; n = 88). Human exposure to lead compounds was found to cause liver enlargement and to activate inflammatory reactions with the characteristics of moderate cholestasis within the bile ducts, while no characteristics of necrotic damage of hepatic cells were noted. It seems that lipid peroxidation can be one of the toxic mechanisms of lead which induce moderate cholestasis. The effects depend on the extent of the lead exposure and were greater in subjects with higher exposure levels, particularly subjects with PbB values greater than 35 μg/dl.
authors.affiliation: Department of Biochemistry, Medical University of Silesia, Jordana, Zabrze, Poland. olakasp@poczta.onet.pl
authors.forename: A
authors.initials: A
authors.lastname: Kasperczyk
authors.forename: M
authors.initials: M
authors.lastname: Dziwisz
authors.forename: A
authors.initials: A
authors.lastname: Ostałowska
authors.forename: E
authors.initials: E
authors.lastname: Swietochowska
authors.forename: E
authors.initials: E
authors.lastname: Birkner
mesh_terms: D000328:Adult; D000395:Air Pollutants, Occupational / Q000097:blood / Q000633:toxicity*; D000410:Alanine Transaminase / Q000097:blood; D000469:Alkaline Phosphatase / Q000097:blood; D000622:Aminolevulinic Acid / Q000097:blood; D001219:Aspartate Aminotransferases / Q000097:blood; D001652:Bile Ducts / Q000000981:diagnostic imaging / Q000187:drug effects* / Q000473:pathology; D002779:Cholestasis / Q000139:chemically induced / Q000378:metabolism / Q000473:pathology; D002802:Cholinesterases / Q000097:blood; D006801:Humans; D007770:L-Lactate Dehydrogenase / Q000097:blood; D007854:Lead / Q000097:blood / Q000633:toxicity*; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000000981:diagnostic imaging / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D008297:Male; D008315:Malondialdehyde / Q000097:blood; D008669:Metallurgy; D008875:Middle Aged; D016273:Occupational Exposure / Q000009:adverse effects*; D009929:Organ Size / Q000187:drug effects; D014463:Ultrasonography; D055815:Young Adult; D005723:gamma-Glutamyltransferase / Q000097:blood
chemical_list: D000395:Air Pollutants, Occupational; D007854:Lead; D008315:Malondialdehyde; D000622:Aminolevulinic Acid; D007770:L-Lactate Dehydrogenase; D005723:gamma-Glutamyltransferase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; D002802:Cholinesterases; D000469:Alkaline Phosphatase
keywords: Lead; hepatic enzymes; liver; ultrasonic imaging