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The cytokine receptor superfamily
1Department of Haematological Medicine, King's College School of Medicine and Dentistry, London, UK.
Blood Reviews
|September 1, 1991
Summary
Understanding cytokine and growth factor receptors is key for cancer therapy. These receptors share structural similarities, forming the cytokine receptor superfamily, crucial for cell signaling and potential therapeutic targets.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Haemopoietic growth factors and cytokines bind to specific receptors, initiating intracellular signaling cascades that control cell proliferation and differentiation.
- Understanding these ligand-receptor-signal pathways is vital for comprehending malignant disease pathophysiology and developing novel therapeutic strategies.
Purpose of the Study:
- To investigate the structural and evolutionary relationships of cytokine and growth factor receptors.
- To explore the mechanisms of ligand binding, signal transduction, and the functional significance of soluble receptor forms.
Main Methods:
- Isolation and cloning of various cytokine receptors (IL-2, IL-3, IL-4, IL-5, IL-6, IL-7, EPO, G-CSF, GM-CSF).
- Analysis of sequence homology and structural features of the extracellular ligand-binding domains.
- Investigation of factors influencing binding affinity and the characterization of soluble receptor forms.
Main Results:
- Cytokine and growth factor receptors share structural homology, forming the cytokine receptor superfamily.
- Extracellular domains possess conserved cysteine residues and a Trp-Ser-X-Trp-Ser motif, with alpha-helical secondary structure.
- High and low affinity binding forms exist, potentially mediated by heterodimerization, multimerization, or glycosylation. Soluble forms of several receptors were identified.
Conclusions:
- The cytokine receptor superfamily exhibits evolutionary relationships and conserved structural elements.
- Mechanisms of signal transduction and the role of soluble receptors warrant further investigation.
- Detailed study of individual receptors can elucidate cytokine pleiotropy and inform therapeutic strategies, particularly in hematologic malignancies.