Abstract:
:The degrading activity for human parathyroid hormone [hPTH-(1-84)] was studied in a rat osteoblast-like osteosarcoma cell line UMR106. At 37 C,UMR106 cells degraded hPTH-(1-84) into fragments in a time-dependent manner, which was shown by a radioimmunoassay with the use of antibody recognizing the C-terminal and middle regions of PTH molecule, whereas the degradation was completely suppressed at 4 C and failed to occur in the absence of the cells. The Lineweaver-Burk plot of this degrading activity at 37 C showed a fairly good linearity and gave a Km value of 5.1 X 10(-7) M. Reverse-phase high-performance liquid chromatography (HPLC) analysis of immunoreactive PTH fragments in the medium disclosed two peaks aside from intact PTH, indicating a limited PTH-hydrolyzing activity of UMR106 cells cleaving the molecule between at least two separate positions. This study suggests the possible involvement of osteoblasts on the metabolism of intact PTH.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Yamaguchi T,Baba H,Fukase M,Kinoshita Y,Fujimi T,Fujita Tdoi
10.1016/s0006-291x(86)80238-8subject
Has Abstractpub_date
1986-12-15 00:00:00pages
762-8issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(86)80238-8journal_volume
141pub_type
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