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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bentley, John D. Bartone, Nicola A. Cosgrove, Leah J. Baxter, Robert C. Pearce, Lesley A. Xiao, Xiaowen Scoble, Judith A. Adams, Timothy E. Sparrow, Lindsay G. Greenall, Sameer A. |
| Description | Author Affiliation: Greenall SA ( Division of Materials Science and Engineering, Commonwealth Scientific and Industrial Research Organisation, Parkville, Victoria 3052, Australia.) |
| Abstract | Insulin-like growth factor II (IGF-II) is a major embryonic growth factor belonging to the insulin-like growth factor family, which includes insulin and IGF-I. Its expression in humans is tightly controlled by maternal imprinting, a genetic restraint that is lost in many cancers, resulting in up-regulation of both mature IGF-II mRNA and protein expression. Additionally, increased expression of several longer isoforms of IGF-II, termed 'pro' and 'big' IGF-II, has been observed. To date, it is ambiguous as to what role these IGF-II isoforms have in initiating and sustaining tumorigenesis and whether they are bioavailable. We have expressed each individual IGF-II isoform in their proper O-glycosylated format and established that all bind to the IGF-I receptor and both insulin receptors A and B, resulting in their activation and subsequent stimulation of fibroblast proliferation. We also confirmed that all isoforms are able to be sequestered into binary complexes with several IGF-binding proteins (IGFBP-2, IGFBP-3, and IGFBP-5). In contrast to this, ternary complex formation with IGFBP-3 or IGFBP-5 and the auxillary protein, acid labile subunit, was severely diminished. Furthermore, big-IGF-II isoforms bound much more weakly to purified ectodomain of the natural IGF-II scavenging receptor, IGF-IIR. IGF-II isoforms thus possess unique biological properties that may enable them to escape normal sequestration avenues and remain bioavailable in vivo to sustain oncogenic signaling. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 1 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-01-04 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Insulin-Like Growth Factor II Chemistry Neoplasms Metabolism Animals Cell Proliferation Fibroblasts Cytology Gene Expression Regulation, Neoplastic Glycosylation HEK293 Cells Insulin-Like Growth Factor Binding Proteins Insulin-Like Growth Factor I Mass Spectrometry Mice Protein Binding Protein Isoforms Protein Structure, Tertiary Receptor Protein-Tyrosine Kinases Signal Transduction Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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