Norepinephrine and thyrotropin stimulation of [Ca++]i in PC C13 a rat thyroid epithelial cell line: effect of transformation by E1A gene adenovirus and polyomavirus middle-T antigen gene.
The effect of thyrotropin and norepinephrine on cytosolic calcium levels were evaluated in normal (PC C13) and transformed (PC E1A, PC Py and PC E1APy) rat thyroid epithelial cell lines. A different pattern of response to both norepinephrine and thyrotropin was observed among the distinct cell lines. In PC C13 the cytosolic calcium rise induced by norepinephrine, characterized by an early transient spike followed by a second phase of sustained calcium levels, was greatly enhanced by thyrotropin. The effect of norepinephrine on calcium concentrations was less affected by thyrotropin in PC C13 transformed by the adenovirus E1A oncogene. Conversely, in Polyoma middle-T transformed PC C13 the increase in cytoplasmic calcium was still sensitive to thyrotropin. The most malignant PC E1APy were totally independent of thyrotropin.
Dipartimento di Scienza delle Comunicazioni Umane, II Facoltà di Medicina e Chirurgia, Università di Napoli, Italy.
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Meucci
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Berlingieri
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Fusco
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Scorziello
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Santoro
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Grieco
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Grimaldi
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Schettini
D000256:Adenoviridae / Q000235:genetics*; D017500:Adenovirus E1A Proteins / Q000235:genetics*; D000595:Amino Acid Sequence; D000818:Animals; D000957:Antigens, Viral, Tumor / Q000235:genetics*; D002118:Calcium / Q000378:metabolism*; D002460:Cell Line; D002472:Cell Transformation, Viral / Q000187:drug effects / Q000235:genetics*; D003600:Cytosol / Q000187:drug effects / Q000378:metabolism; D004847:Epithelial Cells; D015870:Gene Expression / Q000187:drug effects; D005814:Genes, Viral / Q000187:drug effects / Q000235:genetics*; D006706:Homeostasis / Q000187:drug effects / Q000502:physiology; D008969:Molecular Sequence Data; D009638:Norepinephrine / Q000494:pharmacology*; D009857:Oncogenes / Q000235:genetics; D011120:Polyomavirus / Q000187:drug effects / Q000235:genetics*; D051381:Rats; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*; D013268:Stimulation, Chemical; D013961:Thyroid Gland / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D013972:Thyrotropin / Q000494:pharmacology*
D017500:Adenovirus E1A Proteins; D000957:Antigens, Viral, Tumor; D013972:Thyrotropin; D002118:Calcium; D009638:Norepinephrine