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Expression of CD61 (beta3 integrin subunit) on canine cells.
C Arce1, A Moreno, J M Pérez de la Lastra
1Departamento de Genética, Facultad de Veterinaria, Universidad de Córdoba, Spain.
Platelets
|April 12, 2001
Summary
Canine lymphocytes unexpectedly express the beta3 integrin chain (CD61), a molecule typically absent from lymphocytes in humans. This study maps the expression of canine CD41/CD61 and CD51/CD61 complexes on various blood and tissue cells.
Area of Science:
- Immunology
- Cell Biology
- Veterinary Medicine
Background:
- The integrin beta3 chain (CD61/GPIIIa) is a key component of platelet receptors and is expressed on various human cells.
- The expression pattern of canine integrins, particularly the beta3 chain homologue, is not well-characterized.
- Monoclonal antibody JM2E5 is specific for the integrin beta3 chain.
Purpose of the Study:
- To determine the expression of the canine homologue of the integrin beta3 chain (CD41/CD61 or CD51/CD61 complex) on different canine cell types.
- To investigate the presence of this complex on peripheral blood cells, lymph-node cells, spleen cells, and breast tumor cells.
- To compare the expression pattern in canines with that observed in human tissues.
Main Methods:
- Utilized monoclonal antibody JM2E5 to detect the canine integrin beta3 chain homologue.
- Analyzed expression on canine peripheral blood lymphocytes, monocytes, granulocytes, platelets, erythrocytes, lymph-node cells, spleen cells, and breast tumor cells via flow cytometry or similar techniques.
- Performed immunoprecipitation to identify associated antigens and their molecular masses.
Main Results:
- The canine CD41/CD61 or CD51/CD61 complex was found on peripheral blood lymphocytes, monocytes, granulocytes, breast tumor cells, and spleen cells, as well as platelets.
- Expression was notably absent from erythrocytes and lymph-node cells.
- An antigen with molecular masses of 25/100/120 kDa was immunoprecipitated from canine lymphocytes and platelets, but not granulocytes or monocytes.
- Expression on canine lymphocytes was unexpected compared to human tissue patterns.
Conclusions:
- The canine beta3 integrin chain homologue (CD61) is expressed on a broader range of canine cells than previously anticipated, including lymphocytes.
- This finding contrasts with the known expression profile in humans, highlighting species-specific differences in integrin expression.
- The study provides novel insights into canine cell surface markers and immune cell characterization.