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The immunophenotype of blood and cerebrospinal fluid mononuclear cells in dogs
1Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada.
Insights
Cerebrospinal fluid (CSF) immunophenotyping helps diagnose canine neurologic diseases. Flow cytometry revealed distinct mononuclear cell distributions in healthy dogs' blood versus CSF.
Area of Science:
- Veterinary Neurology
- Immunology
- Flow Cytometry
Background:
- Canine inflammatory neurologic diseases present diagnostic challenges.
- Cerebrospinal fluid (CSF) cell analysis often lacks specific etiological information.
- Leukocyte immunophenotyping of CSF may improve diagnostic accuracy.
Purpose of the Study:
- To assess the feasibility of canine CSF flow cytometric immunophenotyping.
- To determine normal mononuclear cell distribution in healthy dog CSF and blood.
Main Methods:
- Paired blood and CSF samples collected from 23 healthy dogs.
- Mononuclear cells labeled with antibodies for CD4, CD8alpha, CD21, and CD14.
- Flow cytometry used to analyze cell surface marker expression.
Main Results:
- Significantly higher proportions of CD4+ and CD21+ cells found in blood compared to CSF.
- No significant difference in CD14+ and CD8a+ cell proportions between blood and CSF.
- Demonstrates differential distribution of mononuclear cell subsets between compartments.
Conclusions:
- Flow cytometric immunophenotyping is feasible for canine CSF analysis.
- Normal canine CSF exhibits a unique mononuclear cell profile compared to peripheral blood.
- Findings support CSF immunophenotyping as a valuable tool for diagnosing canine neurologic diseases.
Abstract:
Inflammatory neurologic diseases are common in dogs, but establishing a definitive diagnosis often is difficult. Nucleated cell number and type in cerebrospinal fluid (CSF) rarely are suggestive of an etiologic agent. We speculated that CSF leukocyte immunophenotyping would be a useful adjunct in the investigation of canine inflammatory neurologic diseases by yielding more specific etiologic information. The goals of this study were to establish the feasibility of flow cytometric evaluation of individual canine CSF samples and to identify the cell distribution in healthy dogs. The mononuclear cell populations of paired blood and CSF samples from 23 healthy dogs were characterized by labeling of cells with antibodies against CD4, CD8alpha, CD21, and CD14 molecules and by flow cytometric analysis of their expression. The mean proportion of CD4+ and CD21+ cells was significantly higher in blood than in the CSF (P < .002 and P < .001, respectively). In contrast, the mean proportion of CD14+ and CD8a+ cells was not significantly different between blood and CSF (P = .5 and p = .9, respectively). These findings demonstrate differences in the distribution and function of mononuclear cells in the circulating venous and subarachnoid compartments in the dog.
