Linked Life Data

12724925

Source:http://linkedlifedata.com/resource/pubmed/id/12724925

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
2003-5-2
pubmed:abstractText
Pentachlorophenol (PCP) is a widely used biocidal compound with several industrial, agricultural and domestic applications. Although it has been shown to induce systemic toxicity and carcinogenesis in several experimental studies, the literature is scarce regarding its toxic mechanisms of action. Recent investigations in our laboratory have shown that PCP induces cytotoxicity and transcriptionally activates stress genes in human liver carcinoma (HepG2) cells [1]. We hypothesized that PCP-induced expression of stress proteins may play a role in the molecular events leading to toxicity and tumorigenesis in liver cells. To test this hypothesis, we performed the MTT-assay for cell viability, and the Western Blot and densitometric analyses to assess the expression of cellular protein including CYP1A1, c-fos, HSP70, and p53. Data obtained from the MTT-assay indicated a strong dose-relationship with respect to PCP cytotoxicity. The LD50 was computed to be 23.0 +/- 5.6 micrograms/mL. Western Blot and densitometric analyses also demonstrated a linear dose-response relationship with regard to CYP1A1 expression within the dose range of 0-50 micrograms/mL. However, a biphasic response was obtained with regard to HSP70, c-fos, and p53 expression, showing a peak induction at 25 micrograms/mL, and a drastic reduction in protein expression at 50 micrograms/mL, probably due to cell death at higher level of PCP exposure. At lower level of exposure, PCP was found to be mitogenic.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0067-8856
pubmed:author
pubmed:issnType
Print
pubmed:volume
39
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
389-96
pubmed:dateRevised
2009-11-11
pubmed:meshHeading
pubmed-meshheading:12724925-Apoptosis, pubmed-meshheading:12724925-Carcinogenicity Tests, pubmed-meshheading:12724925-Cell Division, pubmed-meshheading:12724925-Cytochrome P-450 CYP1A1, pubmed-meshheading:12724925-Dose-Response Relationship, Drug, pubmed-meshheading:12724925-HSP70 Heat-Shock Proteins, pubmed-meshheading:12724925-Humans, pubmed-meshheading:12724925-Lethal Dose 50, pubmed-meshheading:12724925-Liver Neoplasms, pubmed-meshheading:12724925-Neoplasm Proteins, pubmed-meshheading:12724925-Pentachlorophenol, pubmed-meshheading:12724925-Proto-Oncogene Proteins c-fos, pubmed-meshheading:12724925-Reference Values, pubmed-meshheading:12724925-Reproducibility of Results, pubmed-meshheading:12724925-Sensitivity and Specificity, pubmed-meshheading:12724925-Tumor Cells, Cultured, pubmed-meshheading:12724925-Tumor Suppressor Protein p53
pubmed:year
2003
pubmed:articleTitle
CYP1a1, HSP70, P53, and c-fos expression in human liver carcinoma cells (HepG2) exposed to pentachlorophenol.
pubmed:affiliation
Molecular Toxicology Research Laboratory, NIH-Center for Environmental Health, School of Science and Technology, Jackson State University, 1400 Lynch Street, P.O. Box 18540, Jackson, Mississippi 39217, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.