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Recombinant E-peptides of pro-IGF-I have mitogenic activity
X C Tian1, M J Chen, A G Pantschenko
1Biotechnology Center and Department of Molecular and Cell Biology, University of Connecticut, Storrs 06269-3149, USA.
Endocrinology
|June 29, 1999
Summary
Rainbow trout insulin-like growth factor I (IGF-I) E-peptides were tested for biological activity. Recombinant E-peptides demonstrated mitogenic effects on various cell lines, suggesting a role in cell growth.
Area of Science:
- Endocrinology
- Molecular Biology
- Cell Biology
Background:
- Post-translational modification of pro-hormones generates bioactive peptides.
- Insulin-like growth factor I (IGF-I) production involves E-peptide cleavage.
- The biological roles of IGF-I E-peptides remain largely unknown.
Purpose of the Study:
- To investigate the biological activity of rainbow trout pro-IGF-I E-peptides.
- To determine if E-peptides possess mitogenic properties.
Main Methods:
- Production of recombinant rainbow trout Ea-2, Ea-3, and Ea-4 peptides using a His-tag expression system.
- Partial purification of peptides using an affinity Ni++ column.
- Assessment of mitogenic activity via DNA content increase and [3H]-thymidine incorporation in NIH3T3, 293GP, MCF-7, and CMEC cell lines.
Main Results:
- Recombinant Ea-4 peptide showed a dose-dependent increase in mitogenic activity in NIH3T3 cells.
- Ea-4 peptide exhibited similar mitogenic activity across multiple tested cell lines.
- Ea-2 and Ea-3 peptides also displayed mitogenic activity in NIH3T3 cells.
Conclusions:
- Rainbow trout pro-IGF-I E-peptides possess inherent mitogenic activity.
- These findings suggest a potential biological role for E-peptides in regulating cell proliferation.
- E-peptides may represent a novel class of growth-promoting factors.