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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Parathyroid hormone-related protein (PTHrP) inhibits proliferation of Chinese hamster ovary cells stably transfected with a PTH/PTHrP receptor cDNA.

The effect of parathyroid hormone-related protein (PTHrP) on proliferation was examined in Chinese hamster ovary (CHO) cells transfected with a PTH/PTHrP receptor encoding cDNA. Treatment with chicken PTHrP(1-36) (chPTHrP) lowered the cell number to 49 +/- 2% of untreated controls after 6 days with a half-maximal effect at 1 nM. The effect was mimicked by human (h) PTH(1-34), Br-cAMP and forskolin, but not by the receptor antagonist hPTH(3-34). Reduction of cell number was accompanied by increased PTH/PTHrP receptor expression and persistently activated adenylyl cyclase, together with altered cell morphology from epithelial to spindle-like forms, clustered growth and increased phosphate uptake. chPTHrP increased [Ca2+]i, but failed to activate membrane bound protein kinase C (PKC). Pretreatment with chPTHrP did not affect phorbol ester stimulated PKC activity, and chPTHrP or serum evoked increases in [Ca2+]i. In conclusion, PTHrP induced inhibition of proliferation and altered cell morphology is mediated by increased adenylyl cyclase rather than by PKC-dependent mechanisms in CHO cells.[1]

References

  1. Parathyroid hormone-related protein (PTHrP) inhibits proliferation of Chinese hamster ovary cells stably transfected with a PTH/PTHrP receptor cDNA. Muff, R., Kaufmann, M., Born, W., Fischer, J.A. Mol. Cell. Endocrinol. (1997) [Pubmed]
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