Thyrotrophin, but not forskolin, increases intracellular free calcium and calmodulin in pig thyroid cells

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Abstract
The effects of TSH and forskolin were examined on intracellular free calcium ([Ca2+]i) and calmodulin in normal pig thyroid cells in culture. TSH was found to produce acute increases in [Ca2+]i in pig cells. Responses were seen at concentrations of TSH between 0·01 and 10 mU/ml. Sensitivity to TSH was greater in adherent monolayers of cells than in cell suspensions and was also greater in subconfluent rather than confluent monolayers of cells. The increase in [Ca2+]i in response to TSH represented just over a doubling in [Ca2+]i whether examined at 22 °C or 37 °C. Forskolin failed to affect [Ca2+]i. TSH increased [Ca2+]i in the absence of extracellular calcium. TSH, but not forskolin, produced a significant increase in intracellular calmodulin after 3 days of culture of cells with TSH. The increase in calmodulin was of the order of 60% and did not relate to any effect of TSH on thyroid cell number. Journal of Endocrinology (1991) 129, 291–299

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