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Cis and trans acting factors in the regulation of parathyroid hormone (PTH) mRNA stability by calcium and phosphate Naveh-Many T; Bell O; Silver J; Kilav RFEBS Lett 2002[Oct]; 529 (1): 60-4Calcium and phosphate regulate parathyroid hormone (PTH) mRNA stability through differences in binding of parathyroid proteins to an element in its 3'-untranslated region. One of the proteins is AUF1 (A+U-rich element binding factor 1). An in vitro degradation assay showed that transcripts for PTH and chimeric growth hormone (GH)-PTH 63 nt, but not for native GH, were stabilized by PT proteins from rats on low calcium diets and destabilized by proteins from rats on low phosphate diets, correlating with PTH mRNA levels in vivo. In transfection experiments the 63 nt binding element destabilized mRNAs of reporter genes and this was prevented by over-expression of AUF1. Our results identified a functional cis element in PTH mRNA. Differences in protein binding to this element determine PTH mRNA stability and its regulation by calcium and phosphate.|*Regulatory Sequences, Nucleic Acid[MESH]|3' Untranslated Regions[MESH]|Animals[MESH]|Binding Sites[MESH]|Calcium/*metabolism/pharmacology[MESH]|Humans[MESH]|Parathyroid Hormone/*genetics[MESH]|Phosphates/chemistry/*metabolism[MESH]|RNA Stability[MESH]|RNA, Messenger/chemistry/*metabolism[MESH] |
