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• W2093573303 abstract "We have recently demonstrated that parathyroid hormone-like protein (PLP) production by cultured human squamous carcinoma cells (SCC) can be modulated by co-culture with fibroblasts. The interaction of SCC with fibroblasts, possibly occurring during the invasive phase of SCC, may be the stimulus for enhanced PLP production, thus contributing to the genesis of humoral hypercalcemia of malignancy in this type of cancer (Cancer Res 50:3589-3594, 1990). In the present study we show that the fibroblast-induced increase in PLP level in the medium of SCC-4 cells is paralleled by an increase in PLP messenger ribonucleic acid (mRNA) expression in these cells. We also found that the inhibition of secretion of PLP by monensin for 2 h resulted in a marked increase in immunodetectable PLP intracellularly, suggesting that secretion of PLP was a fast process. The modulation of the production of PLP by calcium and hydrocortisone was further examined in SCC-4 cells and was compared to that in normal keratinocytes and in SCC-9 cells. PLP levels in conditioned media were highest in poorly differentiating SCC-4 cells, intermediate in moderately differentiating SCC-9 cells, and lowest in normal keratinocytes showing high differentiating capacity. Furthermore, in each of the cell types used, PLP production was highest in cultures grown under low calcium conditions; at both calcium concentrations used, the presence of hydrocortisone reduced the PLP release into the medium. This reduction was probably due to a direct effect of hydrocortisone on PLP synthesis because the expression of PLP mRNA was also reduced in the presence of hydrocortisone when tested in SCC-4 cells. In conclusion, our findings indicate that the induction of differentiation in both normal and malignant keratinocytes is associated with the inhibition of PLP production." @default.
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• W2093573303 date "1992-02-01" @default.
• W2093573303 modified "2023-10-16" @default.
• W2093573303 title "Regulation of Parathyroid Hormonelike Protein Production in Cultured Normal and Malignant Keratinocytes" @default.
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• W2093573303 doi "https://doi.org/10.1111/1523-1747.ep12555864" @default.
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