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A study of manatee leukocytes using peroxidase stain
1SmithKline Beecham Clinical Laboratory (formerly Doctors & Physicians Laboratory), 801 East Dixie Avenue, Leesburg, FL 34749.
Abstract:
Leukocytes of the manatee, dog, cat, horse, rabbit, bird, and human were stained with modified Wright-Giemsa stain and myeloperoxidase stain. The predominant segmented leukocyte of the manatee stained positive for myeloperoxidase in a manner similar to the human, dog, cat, and horse neutrophil. Rabbit and bird heterophils stained unlike the manatee predominant leukocyte with myeloperoxidase stain. Eosinophils of all species examined also stained differently from the predominant manatee leukocyte. We conclude that the predominant segmented cell type of the manatee is not biochemically similar to the heterophil of the bird and rabbit or to the eosinophil of the human, dog, cat, horse, bird, and rabbit.
Insights
Manatee leukocytes were stained to identify their predominant segmented cell type. This cell is biochemically similar to neutrophils in humans and domestic animals, but not to rabbit or bird heterophils.
Area of Science:
- Comparative leukocyte morphology
- Biochemical analysis of blood cells
- Marine mammal hematology
Background:
- Understanding leukocyte differentiation is crucial for comparative hematology.
- Manatees possess a unique leukocyte profile that requires further characterization.
- Myeloperoxidase (MPO) staining is a key diagnostic tool for differentiating leukocyte types.
Purpose of the Study:
- To characterize the predominant segmented leukocyte in manatees.
- To compare the manatee leukocyte's biochemical properties with those of other species.
- To determine if the manatee leukocyte is a neutrophil, heterophil, or eosinophil.
Main Methods:
- Leukocytes from manatees, dogs, cats, horses, rabbits, birds, and humans were collected.
- Cells were stained using modified Wright-Giemsa stain and myeloperoxidase stain.
- Staining patterns were analyzed and compared across species.
Main Results:
- The predominant manatee segmented leukocyte stained positive for myeloperoxidase, similar to neutrophils in humans, dogs, cats, and horses.
- Rabbit and bird heterophils showed different myeloperoxidase staining patterns compared to the manatee leukocyte.
- Eosinophils from all examined species also exhibited distinct staining from the manatee's predominant leukocyte.
Conclusions:
- The predominant segmented leukocyte in manatees is biochemically similar to neutrophils found in humans and domestic animals.
- This manatee leukocyte is distinct from the heterophils of rabbits and birds.
- The manatee leukocyte is also biochemically different from eosinophils across all species studied.