| Comparative study of the effects of polyunsaturated fatty acids and their metabolites on cell growth and tyrosine kinase activity in oesophageal carcinoma cells. | |
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MedLine Citation:
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PMID: 10582657 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of exogenous gamma-linolenic acid (GLA), arachidonic acid (AA), prostaglandin E2 (PGE2) and prostaglandin A2 (PGA2) were evaluated on cell growth in two squamous oesophageal carcinoma cell lines, WHCO1 and WHCO3 and normal monkey kidney (NMK) cells. In both cancer cell lines all four compounds inhibited cell growth significantly. Indomethacin (I) alone, or in combination with either GLA or AA, caused marked inhibition of cell growth in WHCO3. Total tyrosine kinase (TK) activity was determined after exposure of all three cell types to the lipid compounds. Negligible differences were observed in TK activity between treated and untreated NMK cells. Small increases were noticed in WHCO1. Marked TK stimulation was observed in WHCO3. Addition of indomethacin to WHCO3 also increased TK activity above control value. Tyrosine phosphorylation status of exposed cells indicated that a band of approximately 55 kDa (approximately 55 kDa) was primarily influenced in both WHCO3 and WHCO1. PGA2 caused a decrease in tyrosine phosphorylation of the approximately 55 kDa protein in all three cell types. Negligible differences were observed in the tyrosine phosphorylation status of the approximately 55 kDa in NMK cells exposed to GLA, AA and PGE2 respectively. However, tyrosine phosphorylation of a number of other proteins (21.5-97.4 kDa) was observed in NMK cells. Flow cytometry studies showed an increase in S phase and decrease in G1 phase in WHCO3 exposed to PGE2 and PGA2. Indomethacin alone, or in combination with GLA and AA, respectively, lead to an increase in G1 and a decrease in S phase. Induction of p53 levels was observed in WHCO3 cells exposed to GLA, AA, PGA2, indomethacin and the combination of indomethacin and GLA or AA. |
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Authors:
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A M Joubert; A Panzer; F Joubert; M L Lottering; P C Bianchi; J C Seegers |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Prostaglandins, leukotrienes, and essential fatty acids Volume: 61 ISSN: 0952-3278 ISO Abbreviation: Prostaglandins Leukot. Essent. Fatty Acids Publication Date: 1999 Sep |
Date Detail:
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Created Date: 2000-02-04 Completed Date: 2000-02-04 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 8802730 Medline TA: Prostaglandins Leukot Essent Fatty Acids Country: SCOTLAND |
Other Details:
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Languages: eng Pagination: 171-82 Citation Subset: IM |
Affiliation:
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Department of Physiology, University of Pretoria, South Africa. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Arachidonic Acid / pharmacology Carcinoma, Squamous Cell / enzymology, pathology Cell Division / drug effects* Cell Line Cercopithecus aethiops Dinoprostone / pharmacology Esophageal Neoplasms / enzymology*, pathology* Fatty Acids, Unsaturated / pharmacology* Flow Cytometry Humans Kidney Phosphorylation Prostaglandins A / pharmacology Protein-Tyrosine Kinases / metabolism* Tumor Cells, Cultured Tumor Suppressor Protein p53 / analysis Tyrosine / metabolism gamma-Linolenic Acid / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids, Unsaturated; 0/Prostaglandins A; 0/Tumor Suppressor Protein p53; 13345-50-1/prostaglandin A2; 363-24-6/Dinoprostone; 506-26-3/gamma-Linolenic Acid; 506-32-1/Arachidonic Acid; 55520-40-6/Tyrosine; EC 2.7.10.1/Protein-Tyrosine Kinases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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