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Cloning, expression, and functional characterization of rat MIP-2: a neutrophil chemoattractant and epithelial cell
K E Driscoll1, D G Hassenbein, B W Howard
1Procter & Gamble Company, Miami Valley Laboratories, Cincinnati, Ohio 45253-8707, USA.
Abstract:
Macrophage inflammatory protein-2 (MIP-2) is a member of a family of cytokines that play roles in inflammatory, immune, and wound healing responses. To clone the cDNA for rat MIP-2, RNA was isolated from the lungs of Fischer 344 rats after instillation of lipopolysaccharide. Reverse transcription-polymerase chain reaction was performed by using synthetic oligonucleotide primers designed from the mouse MIP-2 cDNA sequence. A cDNA containing the coding region of rat MIP-2 was cloned and sequenced. Comparison to the mouse MIP-2 cDNA demonstrated 90.3% homology at the nucleotide level and 86% homology at the amino acid level. The rat MIP-2 cDNA was expressed in Escherichia coli and protein evaluated for bioactivity. The recombinant rat MIP-2 was chemotactic for rat neutrophils but did not stimulate migration of rat alveolar macrophages or human peripheral blood eosinophils or lymphocytes. In addition, the recombinant rat MIP-2 and the related rat chemokine, KC/CINC stimulated proliferation of rat alveolar epithelial cells but not fibroblasts in vitro.
Insights
Researchers cloned rat macrophage inflammatory protein-2 (MIP-2) cDNA, finding 90.3% nucleotide homology with mouse MIP-2. Recombinant rat MIP-2 attracts neutrophils and promotes epithelial cell proliferation, offering insights into inflammatory responses.
Area of Science:
- Biochemistry
- Immunology
- Molecular Biology
Background:
- Macrophage inflammatory protein-2 (MIP-2) is a cytokine involved in inflammatory, immune, and wound healing processes.
- Understanding the specific functions of MIP-2 in different species is crucial for studying inflammatory diseases.
Purpose of the Study:
- To clone and characterize the cDNA for rat MIP-2.
- To investigate the bioactivity of recombinant rat MIP-2.
Main Methods:
- RNA isolation from rat lungs post-lipopolysaccharide instillation.
- Reverse transcription-polymerase chain reaction (RT-PCR) using primers based on mouse MIP-2 sequence.
- cDNA cloning, sequencing, and homology comparison with mouse MIP-2.
- Expression of rat MIP-2 in Escherichia coli and bioactivity assays.
Main Results:
- Rat MIP-2 cDNA was successfully cloned and sequenced, showing 90.3% nucleotide and 86% amino acid homology to mouse MIP-2.
- Recombinant rat MIP-2 demonstrated chemotactic activity for rat neutrophils.
- Rat MIP-2 and KC/CINC stimulated proliferation of rat alveolar epithelial cells but not fibroblasts.
Conclusions:
- The cloned rat MIP-2 cDNA provides a tool for further research into its role in rat inflammatory responses.
- Recombinant rat MIP-2 exhibits specific chemoattractant properties for neutrophils and influences epithelial cell behavior, distinct from its effects on other cell types.