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pubmed-article:10335492rdf:typepubmed:Citationlld:pubmed
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pubmed-article:10335492pubmed:abstractTextApomorphine is a potent non selective agonist at the D1 and D2 dopamine receptors acting both pre- and post-synaptically. In this report we describe a novel function of apomorphine, independent from its dopaminergic activity. Apomorphine inhibits Chinese hamster ovary (CHO)-K1 cell proliferation in a dose-dependent manner. The EC50 of apomorphine-induced inhibition of CHO-K1 cell proliferation determined by cell counting was 3.24 +/- 0.07 microM. Remarkably, the dose-response curve obtained by measuring the incorporation of [3H]thymidine was practically identical to the previous one giving an EC50 of 3.52 +/- 0.04 microM. The dopaminergic antagonists SCH23390 and spiperone at a concentration of 10 microM (well beyond their Kd values for the dopamine D1- and D2-like receptors respectively) were not able to antagonize the effect of apomorphine on CHO-K1 cell proliferation. Apomorphine exerts its effect early during incubation; CHO-K1 cells exposed to apomorphine for a period as short as 1 h and then allowed to grow for three days were significantly reduced in number with respect to untreated control cells. After four hours of exposition to apomorphine (10 microM) the antiproliferative effect was similar to that seen when this compound was present in the bath for all three days. Concentrations of apomorphine higher than 10 microM induced cell death, and the colony was completely destroyed at 50 microM. Cytometric analyses showed a significant accumulation of CHO-K1 cells in the G2/M phase.lld:pubmed
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pubmed-article:10335492pubmed:authorpubmed-author:BarbierPPlld:pubmed
pubmed-article:10335492pubmed:authorpubmed-author:CorsiniG UGUlld:pubmed
pubmed-article:10335492pubmed:authorpubmed-author:PardiniCClld:pubmed
pubmed-article:10335492pubmed:authorpubmed-author:ScarselliMMlld:pubmed
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pubmed-article:10335492pubmed:authorpubmed-author:CollecchiPPlld:pubmed
pubmed-article:10335492pubmed:authorpubmed-author:SalvadoriFFlld:pubmed
pubmed-article:10335492pubmed:authorpubmed-author:ArmogidaMMlld:pubmed
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pubmed-article:10335492pubmed:volume55lld:pubmed
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pubmed-article:10335492pubmed:pagination47-55lld:pubmed
pubmed-article:10335492pubmed:dateRevised2005-11-17lld:pubmed
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pubmed-article:10335492pubmed:year1999lld:pubmed
pubmed-article:10335492pubmed:articleTitleApomorphine has a potent antiproliferative effect on Chinese hamster ovary cells.lld:pubmed
pubmed-article:10335492pubmed:affiliationDepartment of Neuroscience, University of Pisa, Italy.lld:pubmed
pubmed-article:10335492pubmed:publicationTypeJournal Articlelld:pubmed