Key Points
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Cytokines are important in the regulation of haematopoiesis and immune responses. Regulated physiological processes include the survival and proliferation of haematopoietic progenitor cells, induction of their lineage-specific differentiation, functional activation of mature lymphocytes, the activation and regulation of innate and adaptive immune responses, as well as the selective induction of apoptosis.
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Cytokines representing only a small number of protein families are crucial in these physiological processes, the regulation of which is important in many areas of disease management.
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The significance of their regulatory roles is illustrated by the frequency with which cytokines and soluble cytokine receptors find application as therapeutic drugs. Protein drugs in these classes include erythropoietin (EPO), granulocyte colony-stimulating factor (G-CSF), interferon (IFN)-α, IFN-β, human growth hormone (HGH) and ENBREL.
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Over the past decade, many new 'orphan' members of cytokine and cytokine receptor families have been discovered through homology-based gene-sequence mining approaches. Such orphan genes have no biological annotation at the time of discovery and present a formidable challenge to elucidate function.
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Advances in ligand/receptor pairing techniques have led to a recognition that systematic pairing of 'orphan' database-derived cytokines and/or cytokine receptors with their binding partners can lead to a marked acceleration in the elucidation of biological function. The tissue distribution of a receptor, and the biological activity of a ligand, can direct investigators rapidly towards regulatory function. The power of cytokine–receptor pairing to accelerate the understanding of function is illustrated with examples of candidate drug discoveries. Several of these discoveries, resulting from cytokine/receptor pairings, are currently advancing towards human clinical evaluation.
Abstract
Over the past decade, advances in both gene discovery and ligand-receptor pairing techniques have led to the recognition that systematic pairing of 'orphan' database-derived cytokines and/or cytokine receptors with their cognate partners can lead to a marked acceleration in the elucidation of biological function. The sometimes-restricted tissue distribution of the receptor, coupled with the highly specific bioactivity of the corresponding ligand, can direct investigators rapidly towards regulatory function and site-of-action studies. The power of cytokine–receptor pairing to accelerate the understanding of function will be illustrated, citing several examples of candidate drug discoveries. Several of these discoveries, resulting from cytokine–receptor pairings, are at present advancing towards human clinical evaluation.
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Acknowledgements
The authors wish to thank G. McKnight and M. Bernard for assistance and information relevant to the current clinical development status of cytokines discussed in this review.
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Encyclopedia of Life Sciences
Glossary
- IMMUNOGLOBULIN (IG) FUSION
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Many proteins can be engineered to have a long circulating half-life, thereby prolonging their therapeutic benefits. One popular strategy has been to fuse the gene of to a portion of a stable antibody structure (Ig), which confers a favourable therapeutic profile.
- ORPHAN
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Genes with no known function, often discovered through mining sequence databases are most frequently initially described only in terms of their structure.
- PARALOGUES
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A set of homologous genes within a single species which have diverged from each other via gene duplication. Paralogous genes frequently acquire completely independent biological functions after duplication.
- SEQUENCE MOTIF
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Well-conserved sequence similarities (or 'motifs') found in most or all members of a given gene family. The 'WSXWS' motif is a penta-peptide sequence conserved in nearly all class I cytokine receptors.
- GENE KNOCKOUT
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The deletion of both copies of a gene from the genome of an experimental organism. The physiological alterations seen in such 'knockout' organisms can be attributed to the gene deletion, but are frequently be complicated by effects on abnormal embryonic development.
- PLATELET HAEMATOPOIESIS
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The synthesis and maturation of platelet cells from progenitor stem cells. Specific cytokines from peripheral tissues regulate the rates of synthesis for each lineage of blood cells.
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Foster, D., Parrish-Novak, J., Fox, B. et al. Cytokine–receptor pairing: accelerating discovery of cytokine function. Nat Rev Drug Discov 3, 160–170 (2004). https://doi.org/10.1038/nrd1305
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DOI: https://doi.org/10.1038/nrd1305
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