Figure 1. PTH (1-34)-induced concentration-dependent stimulation of intracellular calcium mobilization in CHO-K1/PTH/Gα15 cells. The cells were loaded with Calcium-4 prior to being stimulated with agonist PTH (1-34). The intracellular calcium change was measured by FLIPRTETRA. The relative fluorescent units (RFU) were plotted against the log of the cumulative doses of PTH (1-34) (Mean ± SD, n = 2). The EC50 of PTH (1-34) on this cell was 0.26 µM.
Notes:
1. EC50 value is calculated with four parameter logistic equation:
Y=Bottom + (Top-Bottom)/(1+10^((LogEC50-X)*HillSlope))
X is the logarithm of concentration. Y is the response
Y is RFU and starts at Bottom and goes to Top with a sigmoid shape.
CHO-K1/PTH1/Gα15 Stable Cell Line
Parathyroid hormone (PTH)/PTH-related peptide (PTHrP) receptor (PTHR1) is a G protein coupled receptor which mediates the actions of both amino-terminal PTH and PTHrP fragments. The most abundant expression of PTHR1 is found in renal tubular cells and in osteoblasts, where the PTH/PTHrP receptor mediates the endocrine actions of PTH, and in prehypertrophic chondrocytes of the metaphyseal growth plate, where it mediates the autocrine/paracrine actions of PTHrP. Intact PTH (PTH 1-84) is compounded by a peptide of 84 amino acids (AA), the amino-terminal sequence, constituted by the first 34 AA (N-terminal structure), is necessary for its action.
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