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Novel chicken CXC and CC chemokines
C Sick1, K Schneider, P Staeheli
1Abteilung Virologie, Institut für Medizinische Mikrobiologie und Hygiene, University of Freiburg, Freiburg, 79008, Germany.
Cytokine
|March 8, 2000
Summary
Researchers identified two novel chemokines, K60 (a CXC chemokine) and K203 (a CC chemokine), secreted by chicken macrophages (HD-11 cells) after lipopolysaccharide (LPS) stimulation. These findings advance understanding of avian immune responses and chemokine diversity.
Area of Science:
- Immunology
- Molecular Biology
- Genomics
Background:
- Chicken macrophage cell line HD-11 secretes cytokine-active factors upon lipopolysaccharide (LPS) stimulation.
- Characterization of these secreted factors is crucial for understanding avian immune responses.
Purpose of the Study:
- To identify and characterize novel chemokines produced by LPS-stimulated chicken macrophages.
- To analyze the structural and sequence homology of newly identified chemokines to known mammalian and avian counterparts.
Main Methods:
- Representational difference analysis (RDA) of RNA from LPS-induced and uninduced HD-11 cells.
- Isolation and sequencing of cDNA clones encoding novel polypeptides.
- Sequence homology analysis using bioinformatics tools.
Main Results:
- Two novel chemokine cDNAs, K60 and K203, were isolated.
- K60 encodes a CXC chemokine with 104 residues, showing 67% identity to chicken 9E3/CEF4 and ~50% to human IL-8.
- K203 encodes a CC chemokine with 89 residues, showing 43% identity to a chicken MIP-1beta homolog and ~50% to human MIP-1beta.
Conclusions:
- The study identified two novel chemokines, K60 (CXC) and K203 (CC), in chicken macrophages.
- These findings expand the known repertoire of avian chemokines and provide targets for further functional studies.
- Structural and sequence similarities suggest conserved roles for chemokines in innate immunity across species.