Insulin-like growth factors I and II exert pleiotropic effects on diverse cell types and have a broad range of functions in the embryo, fetus, and adult. Each IGF interacts with a unique high-affinity receptor located within the plasma membrane of responsive cells. Actions of both IGFs are mediated through interaction with the IGF-I receptor, a ligand-stimulated tyrosine protein kinase structurally related to the insulin receptor. By contrast the role of the IGF-II receptor in IGF-II action is controversial, although its function in mediating lysosomal enzyme transport is well-documented. As a further complexity, effects of both IGFs on target tissues may be modified through interactions with locally- secreted IGF binding proteins. As part of long-term efforts to understand the mechanisms by which the actions of the IGFs, their receptors, and binding proteins are integrated within the cell and in the whole organism, the focus of this application will be on the functions and regulation of IGF-II, the IGF-II receptor, and a newly-characterized IGF binding protein, IGFBP-5, in a model developmental system, the differentiating myoblast, and in the developing mouse embryo. Toward this end the following four Specific Aims are proposed: 1. To determine the role of IGF-II in muscle differentiation and to define its mechanism of action. 2. To elucidate the molecular pathway responsible for developmental regulation of IGF-II gene expression. 3. To determine the functions of the IGF-II receptor in muscle differentiation and in mouse development, and to characterize the mechanisms responsible for the developmental control of receptor gene expression. 4. To elucidate the functions of IGFBP-5 in muscle differentiation and in development, and to determine the steps involved in regulation of binding protein gene expression.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
2R01DK042748-04
Application #
2142522
Study Section
Endocrinology Study Section (END)
Project Start
1991-01-01
Project End
1998-12-31
Budget Start
1994-01-01
Budget End
1994-12-31
Support Year
4
Fiscal Year
1994
Total Cost
Indirect Cost
Name
Washington University
Department
Biochemistry
Type
Schools of Medicine
DUNS #
062761671
City
Saint Louis
State
MO
Country
United States
Zip Code
63130
Rotwein, Peter (2018) The insulin-like growth factor 2 gene and locus in nonmammalian vertebrates: Organizational simplicity with duplication but limited divergence in fish. J Biol Chem 293:15912-15932
Rotwein, Peter (2018) The complex genetics of human insulin-like growth factor 2 are not reflected in public databases. J Biol Chem 293:4324-4333
Rotwein, Peter (2017) Large-scale analysis of variation in the insulin-like growth factor family in humans reveals rare disease links and common polymorphisms. J Biol Chem 292:9252-9261
Alzhanov, Damir; Rotwein, Peter (2016) Characterizing a distal muscle enhancer in the mouse Igf2 locus. Physiol Genomics 48:167-72
Gross, Sean M; Rotwein, Peter (2016) Mapping growth-factor-modulated Akt signaling dynamics. J Cell Sci 129:2052-63
Gross, Sean M; Rotwein, Peter (2016) Unraveling Growth Factor Signaling and Cell Cycle Progression in Individual Fibroblasts. J Biol Chem 291:14628-38
Gardner, Samantha; Gross, Sean M; David, Larry L et al. (2015) Separating myoblast differentiation from muscle cell fusion using IGF-I and the p38 MAP kinase inhibitor SB202190. Am J Physiol Cell Physiol 309:C491-500
Rotwein, Peter S (2015) Editorial: is it time for an evolutionarily based human endocrinology? Mol Endocrinol 29:487-9
Gross, Sean M; Rotwein, Peter (2015) Akt signaling dynamics in individual cells. J Cell Sci 128:2509-19
Rotwein, Peter (2014) Editorial: the fall of mechanogrowth factor? Mol Endocrinol 28:155-6

Showing the most recent 10 out of 63 publications