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Immunohistochemical expression study of proapoptotic BH3-only protein bad in canine nonneoplastic tissues and canine
M Dettwiler1, M Croci, L Vaughan
1Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 268, Zurich, Switzerland. franco.guscetti@vetpath.uzh.ch
Abstract:
The BH3-only protein Bad is a proapoptotic Bcl-2 family member that acts as a sensitizer in intrinsic apoptosis by inactivating antiapoptotic members through heterodimer formation. Bad has been shown to contribute to tumorigenesis, including lymphoma formation in humans and mice, through alteration in expression or functional status. Here, its immunohistochemical expression was analyzed in canine nonneoplastic and lymphoma tissues using tissue microarrays. Bad was expressed in the cytoplasm of a wide range of nonneoplastic tissues, especially epithelial cells. Nonneoplastic lymph nodes displayed weak immunostaining in the follicular germinal centers only. Immunoblotting supported these observations but also revealed presence of nonspecific labeling in some organs. Of 81 lymphomas, 29 (35.8%) displayed moderate to strong immunohistochemical Bad labeling, and a significant expression increase was found in lymphomas (especially B cell and double negative) compared to nonneoplastic lymph nodes. These findings warrant further investigations of the functional status, the involvement of partner proteins, and a possible impact of Bad on prognosis in canine lymphoma.
Insights
The proapoptotic protein Bad is expressed in canine lymphoma tissues. Its increased expression in lymphomas suggests a potential role in canine cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- The BH3-only protein Bad is a proapoptotic member of the Bcl-2 family.
- Bad inactivates antiapoptotic proteins, sensitizing cells to intrinsic apoptosis.
- Altered Bad expression or function contributes to tumorigenesis, including lymphoma.
Purpose of the Study:
- To analyze the immunohistochemical expression of Bad in canine nonneoplastic and lymphoma tissues.
- To compare Bad expression levels between normal canine tissues and canine lymphomas.
Main Methods:
- Immunohistochemistry was performed on canine tissue microarrays.
- Immunoblotting was used to support immunohistochemical observations.
- Expression analysis was conducted on 81 canine lymphomas and nonneoplastic tissues.
Main Results:
- Bad was broadly expressed in the cytoplasm of nonneoplastic canine tissues, particularly epithelial cells.
- Nonneoplastic lymph nodes showed weak Bad immunostaining in germinal centers.
- Moderate to strong Bad labeling was observed in 35.8% of canine lymphomas, with significantly higher expression in B cell and double-negative lymphomas compared to nonneoplastic lymph nodes.
Conclusions:
- Bad is expressed in canine lymphoma tissues, with increased levels in certain lymphoma types.
- These findings suggest a potential role for Bad in canine lymphoma pathogenesis.
- Further research is warranted to investigate Bad's functional status, partner proteins, and prognostic impact in canine lymphoma.
