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Presence of IDF45 (mlGFBP-3) binding sites on chick embryo fibroblasts
- Source :
- Biochemical and Biophysical Research Communications. 179:495-501
- Publication Year :
- 1991
- Publisher :
- Elsevier BV, 1991.
-
Abstract
- IDF45 (inhibitory diffusible factor) a mouse insulin-like growth factor binding protein (mlGFBP-3) has been shown to 100 percent inhibit DNA synthesis stimulated by serum in chick embryo fibroblasts (CEF). Our previous results suggested that this large inhibition by IDF45 of serum stimulation was not just the result of its inhibitory activity toward IGF present in serum. The addition of Mn 2+ (10 −3 M) in the incubation medium enables us to show the presence of numerous binding sites per cells (about 60,000) of mlGFBP-3. However the dissociation constant (10 −8 M) indicated that this mouse IGFBP-3 bound to the membrane with low affinity. These findings lend new support to the assumption of the bifunctional property of IGFBP-3, which would have an effect outside the cell (binding of IGF in the medium) and another effect within cells or on the surface.
- Subjects :
- medicine.medical_specialty
medicine.medical_treatment
Biophysics
Chick Embryo
Biochemistry
Somatomedins
Internal medicine
medicine
Animals
Binding site
Fibroblast
Molecular Biology
Cells, Cultured
Manganese
Binding Sites
biology
DNA synthesis
Binding protein
Growth factor
Cell Membrane
Embryo
Cell Biology
Fibroblasts
Growth Inhibitors
Culture Media
Cell biology
Insulin-Like Growth Factor Binding Proteins
Dissociation constant
Kinetics
medicine.anatomical_structure
Endocrinology
Insulin-like growth factor 2
biology.protein
Carrier Proteins
Oligopeptides
Subjects
Details
- ISSN :
- 0006291X
- Volume :
- 179
- Database :
- OpenAIRE
- Journal :
- Biochemical and Biophysical Research Communications
- Accession number :
- edsair.doi.dedup.....6386d7132a9eb1476d3f95d07f940925
- Full Text :
- https://doi.org/10.1016/0006-291x(91)91398-v