Abstract：
:Phagocytes remove and store mercury (Hg) that enters the body. Macrophages and granulocytes respond in opposite ways to Hg: macrophages loose cell viability, and neutrophils become protected from apoptosis. We have investigated the cytology of early intake of Hg by macrophages and neutrophils after a short period (2-4 min) of in vivo exposure to HgCl2. The two types of phagocytes were attracted either to a subcutaneous air pouch or to the peritoneal cavity of BALB/c mice by in situ BSA injection. BSA caused, 72 hours later, inflammatory exudates where neutrophils (air-pouch cavity) or macrophages (peritoneal cavity) were the predominant cell type. A lethal dose of HgCl2 (25 mg) was then injected in the two inflammatory cavities. The mice died 2-4 min later and the cell exudates were harvested and studied by scanning electron microscopy coupled with X-ray elemental microanalysis (SEM-XRM). More than half of the phagocytes showed ingested Hg; a higher percentage of macrophages (around 70%) than neutrophils (around 50%) were positive for the metal. Intracellular particles of Hg were spheroid and presented a small diameter (less than 20 nm). They could be seen in large numbers inside phagocytes (up to 20-30 Hg dots per cell); they were scattered throughout the cytoplasm of the cells. The ability of phagocytes to ingest Hg increased as the BSA-induced inflammation progressed. We conclude that (i) Hg is quickly ingested as small particles by phagocytes; (ii) endocytosis of Hg increases with the degree of activation of phagocytes; and (iii) phagocytes internalize Hg by pinocytosis.
journal_name
Hum Exp Toxicoljournal_title
Human & experimental toxicologyauthors
Cunha EM,Oliveira MJ,Ferreira PG,Aguas APdoi
10.1191/0960327104ht472oasubject
Has Abstractpub_date
2004-08-01 00:00:00pages
447-53issue
9eissn
0960-3271issn
1477-0903journal_volume
23pub_type
杂志文章abstract：:The study was done to find out whether subacute exposure to supercypermethrin forte (SCM) affected cellular and humoral immunity. Groups of 10 male Wistar rats were given SCM by gavage for 28 days at 12.5 mg kg-1 day-1 (1/14 LD50), 8.75 mg kg-1 day-1 (1/20 LD50) and 4.38 mg kg-1 day-1 (1/40 LD50) and the response of s...
journal_title：Human & experimental toxicology
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abstract：:Exposure of Co631 cells to plutonium leads to increasing cell death depending on the dose and incubation time. The effects, however, are more pronounced with 239Pu, than with 238Pu. Uptake and binding of the two radionuclides during a 5-h incubation are about equal, but 238Pu is lost more rapidly from the cell. There ...
journal_title：Human & experimental toxicology
pub_type： 杂志文章
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abstract：:In order to assess the effect of arsenic on the male reproductive impairment in mice, 7-week-old animals were exposed to 7.5 mg sodium arsenite (NaAsO(2))/kg body weight, during 35 days (one spermatogenic cycle). One group of animals was sacrificed after exposure, while another group received distilled water for an ad...
journal_title：Human & experimental toxicology
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abstract：:1. Four different concentrations of quinalphos and methyl parathion were tested on human peripheral lymphocytes over different time periods, for the analysis of chromosomal aberrations and sister chromatid exchanges (SCEs). 2. A significant increase in chromosomal aberrations was observed when cells were treated with ...
journal_title：Human & experimental toxicology
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abstract：:This study was designed to evaluate the maternal toxicity and teratogenicity of fenproporex, one of the most widely-used anorectic drugs in many countries, including Brazil. Three periods of exposure were evaluated: (a) 30 days before mating; (b) from gestational day (GD) 0 to 14; and (c) 30 days before mating and dur...
journal_title：Human & experimental toxicology
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journal_title：Human & experimental toxicology
pub_type： 杂志文章
doi：10.1177/0960327112454891
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journal_title：Human & experimental toxicology
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journal_title：Human & experimental toxicology
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