Characterization of the mitogen-regulated protein (proliferin) receptor
Mitogen-regulated protein (MRP/PLF; also called proliferin) is a member of the PRL-GH family expressed by the placenta in mid-gestation. This report describes an MRP/PLF receptor in uterine membrane preparations from pregnant mice. Peak receptor activity occurred at 11 days of gestation with a disso...
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Published in | Endocrinology (Philadelphia) Vol. 136; no. 1; p. 283 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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United States
01.01.1995
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Abstract | Mitogen-regulated protein (MRP/PLF; also called proliferin) is a member of the PRL-GH family expressed by the placenta in mid-gestation. This report describes an MRP/PLF receptor in uterine membrane preparations from pregnant mice. Peak receptor activity occurred at 11 days of gestation with a dissociation constant of 6 x 10(-10) M and maximal binding capacity of 86 fmole MRP/PLF/mg membrane protein. PRL, PL-I, and mannose-6-phosphate did not compete for binding, and GH competed weakly only at high concentrations. Primary cells cultured from uteri taken at days 8-11 of gestation responded to MRP/PLF with increases in DNA synthesis. Uterine cells from later stages of gestation did not respond to MRP/PLF. This is the first reported evidence of a function mediated by MRP/PLF and suggests a role for this protein in maternal-fetal interactions during reproduction. Thus, it seems that MRP/PLF is a placentally derived growth factor, which stimulates proliferation in the uterus in a developmentally defined period to coordinate uterine growth with fetal development. |
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AbstractList | Mitogen-regulated protein (MRP/PLF; also called proliferin) is a member of the PRL-GH family expressed by the placenta in mid-gestation. This report describes an MRP/PLF receptor in uterine membrane preparations from pregnant mice. Peak receptor activity occurred at 11 days of gestation with a dissociation constant of 6 x 10(-10) M and maximal binding capacity of 86 fmole MRP/PLF/mg membrane protein. PRL, PL-I, and mannose-6-phosphate did not compete for binding, and GH competed weakly only at high concentrations. Primary cells cultured from uteri taken at days 8-11 of gestation responded to MRP/PLF with increases in DNA synthesis. Uterine cells from later stages of gestation did not respond to MRP/PLF. This is the first reported evidence of a function mediated by MRP/PLF and suggests a role for this protein in maternal-fetal interactions during reproduction. Thus, it seems that MRP/PLF is a placentally derived growth factor, which stimulates proliferation in the uterus in a developmentally defined period to coordinate uterine growth with fetal development. |
Author | Nilsen-Hamilton, M Rosenzweig, N Nelson, J T |
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Snippet | Mitogen-regulated protein (MRP/PLF; also called proliferin) is a member of the PRL-GH family expressed by the placenta in mid-gestation. This report describes... |
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SubjectTerms | Animals Binding, Competitive DNA - biosynthesis Female Gestational Age Glycoproteins - pharmacology Growth Substances - pharmacology Intercellular Signaling Peptides and Proteins Kinetics Membranes - metabolism Mice Pregnancy Receptors, Growth Factor - metabolism Uterus - metabolism |
Title | Characterization of the mitogen-regulated protein (proliferin) receptor |
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