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Effect of conglutinin on phagocytic activity of bovine granulocytes
M Dec1, A Wernicki, A Puchalski
1Institute of Biological Bases of Animal Diseases, Subdepartment of Veterinary Prevention, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Akademicka 12, 20-033 Lublin, Poland. marta.dec@up.lublin.pl
Insights
Bovine conglutinin enhances the ingestion of zymosan particles by leukocytes, but does not affect E. coli uptake or leukocyte chemotaxis. This suggests a specific role for conglutinin in recognizing and facilitating the clearance of certain microbial components.
Area of Science:
- Immunology
- Veterinary Medicine
- Biochemistry
Background:
- Bovine conglutinin is a serum protein involved in innate immunity.
- Phagocytosis is a critical process for pathogen clearance by immune cells.
- Understanding the interactions between bovine conglutinin and microorganisms is important for cattle health.
Purpose of the Study:
- To investigate the effect of bovine conglutinin on leukocyte phagocytic activity.
- To assess the binding of bovine conglutinin to various microorganisms.
- To determine if bovine conglutinin influences leukocyte chemotaxis or the ingestion of specific pathogens.
Main Methods:
- Flow cytometry was used to measure the phagocytosis of zymosan particles and E. coli by granulocytes.
- Chemotactic activity of bovine conglutinin was assessed.
- Binding assays were performed to evaluate conglutinin's interaction with different microorganisms.
Main Results:
- Bovine conglutinin binds strongly to yeast cells and mannan-rich zymosan particles.
- Weak binding was observed with tested bacterial strains, even those with mannan in their O antigen.
- Conglutinin did not act as a chemotactic factor or enhance E. coli ingestion by granulocytes.
- Conglutinin significantly increased zymosan particle ingestion by leukocytes.
Conclusions:
- Bovine conglutinin specifically enhances the phagocytosis of zymosan particles, likely due to its affinity for mannan.
- Conglutinin does not appear to play a significant role in the chemotaxis or E. coli phagocytosis by bovine leukocytes.
- These findings highlight a targeted role for bovine conglutinin in the innate immune response against specific microbial structures.
Abstract:
In the present study we investigated the effect of bovine conglutinin on the phagocytic activity of leukocytes. We measured both the chemotactic activity of conglutinin and its effect on the internalization of zymosan particles and E. coli by granulocytes. We also assessed the binding of conglutinin to various microorganisms isolated from clinical cases in cattle. We showed that conglutinin binds strongly to the surface of yeast cells and to mannan-rich zymosan particles, while weak binding was observed in the case of the bacterial strains tested, including those whose O antigen is composed of mannan. Conglutinin (1-10 microg/ml) neither acts as a chemotactic factor for peripheral blood leukocytes nor affects ingestion of E. coli by granulocytes. However, as flow cytometry based assay showed, conglutinin (0.1-1 microg/ml) increased ingestion of zymosan expressed as mean fluorescence intensity (MFI) of positive cells.
