TMED10 mediates the trafficking of insulin-like growth factor 2 along the secretory pathway for myoblast differentiation

The insulin-like growth factor 2 (IGF2) plays critical roles in cell proliferation, migration, differentiation, and survival. Despite its importance, the molecular mechanisms mediating the trafficking of IGF2 along the secretory pathway remain unclear. Here, we utilized a Retention Using Selective H...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2023-11, Vol.120 (46), p.1-e2215285120
Main Authors: Li, Tiantian, Yang, Feng, Heng, Youshan, Zhou, Shaopu, Wang, Gang, Wang, Jianying, Wang, Jinhui, Chen, Xianwei, Yao, Zhong-Ping, Wu, Zhenguo, Guo, Yusong
Format: Article
Language:English
Subjects:
Cell differentiation
Cell migration
Cell proliferation
Differentiation
Golgi apparatus
Growth factors
Insulin
Insulin-like growth factor II
Insulin-like growth factors
Molecular modelling
Myoblasts
Packaging
Residues
Secretion
Vesicles
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Summary:The insulin-like growth factor 2 (IGF2) plays critical roles in cell proliferation, migration, differentiation, and survival. Despite its importance, the molecular mechanisms mediating the trafficking of IGF2 along the secretory pathway remain unclear. Here, we utilized a Retention Using Selective Hook system to analyze molecular mechanisms that regulate the secretion of IGF2. We found that a type I transmembrane protein, TMED10, is essential for the secretion of IGF2 and for differentiation of mouse myoblast C2C12 cells. Further analyses indicate that the residues 112-140 in IGF2 are important for the secretion of IGF2 and these residues directly interact with the GOLD domain of TMED10. We then reconstituted the release of IGF2 into COPII vesicles. This assay suggests that TMED10 mediates the packaging of IGF2 into COPII vesicles to be efficiently delivered to the Golgi. Moreover, TMED10 also mediates ER export of TGN-localized cargo receptor, sortilin, which subsequently mediates TGN export of IGF2. These analyses indicate that TMED10 is critical for IGF2 secretion by directly regulating ER export and indirectly regulating TGN export of IGF2, providing insights into trafficking of IGF2 for myoblast differentiation.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.2215285120