Use of monoclonal antibodies to refine flow cytometric differential cell counting of canine bone marrow cells

Douglas J. Weiss DVM, PhD1
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  • 1 Department of Veterinary PathoBiology, College of Veterinary Medicine, University of Minnesota, St. Paul, MN 55108.


Objectives—To evaluate use of monoclonal antibodies to increase accuracy of flow cytometric differential cell counting of canine bone marrow cells.

Sample Population—Bone marrow specimens from 15 dogs.

Procedures—Specimens were labeled with monoclonal antibodies that detected CD18, major histocompatability antigen class-II (MHC class-II), CD14, and Thy-1. Location of fluorescent and nonfluorescent cells within gates of a template developed for canine bone marrow differential cell counting was determined, the template was revised, and 10 specimens were analyzed by use of the old and revised templates and by labeling cells with anti-MHC class-II and anti-CD14.

Results—Data confirmed the presumptive location of marrow subpopulations in scatter plots, permitted detection of lymphocytes and monocytemacrophages, and was used to revise the analysis template used for differential cell counting. When differential cells counts determined by the original and revised templates were compared with results of manual differential cell counts, the revised template had higher correlation coefficients and more similar mean values. Labeling cells with anti-MHC class-II and anti-CD14 permitted identification of lymphoid and monocyte-macrophages cells in bone marrow specimens.

Conclusions and Clinical Relevance—Use of the revised flow cytometric analysis template combined with anti-CD14 and anti-MHC class-II antibody labeling provides reliable differential cell counts for clinical bone marrow specimens in dogs. These techniques have potential applications to clinical bone marrow examination and preclinical toxicity studies. (Am J Vet Res 2001;62:1273–1278)