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[Functional expression of human GM-CSF receptor in NIH3T3 cells]
1Jiangsu Institute of Hematology, First Affiliated Hospital, Suzhou Medical College, Suzhou 215006.
Zhonghua Xue Ye Xue Za Zhi = Zhonghua Xueyexue Zazhi
|November 28, 2001
Summary
Introducing both human granulocyte-macrophage colony-stimulating factor receptor (GM-R) alpha and beta subunits into NIH3T3 cells enables ligand-dependent cell growth and colony formation. This process involves the phosphorylation of beta c and activation of the Jak2, Shc, and SHIP signaling pathway.
Area of Science:
- Cell Biology
- Molecular Biology
- Signal Transduction
Context:
- The granulocyte-macrophage colony-stimulating factor receptor (GM-R) plays a crucial role in hematopoiesis and immune responses.
- Understanding the specific contributions of GM-R subunits is essential for elucidating its signaling mechanisms.
Purpose:
- To characterize the functional reconstitution of the human GM-CSF receptor (GM-R) in NIH3T3 cells.
- To investigate the signaling pathways activated by GM-CSF upon receptor reconstitution.
Summary:
- NIH3T3 cells were transfected with cDNAs encoding the alpha and beta subunits of the human GM-R.
- The reconstituted GM-R (GM-R alpha/beta) mediated ligand-dependent cell proliferation and colony formation in soft agar.
- Activation of the receptor induced tyrosine phosphorylation of beta c, Jak2, Shc, and SHIP, while GM-R alpha alone did not activate mitogenic signaling.
Impact:
- Demonstrates that co-expression of both GM-R alpha and beta subunits is necessary for functional GM-CSF signaling in NIH3T3 cells.
- Highlights the involvement of the beta c, Jak2, Shc, and SHIP signaling cascade in GM-CSF-mediated cellular responses.
- Provides a model system for studying GM-R function and signaling in a non-hematopoietic cell context.