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Selective IgM deficiency and abnormal B-cell response in a foal.
A D Weldon1, C Zhang, D F Antczak
1Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853.
Journal of the American Veterinary Medical Association
|November 1, 1992
Summary
Selective IgM deficiency was diagnosed in a young horse with respiratory issues. This indicates a potential B-cell defect, mirroring human immunodeficiency disorders.
Area of Science:
- Veterinary Immunology
- Equine Medicine
- Immunodeficiency Disorders
Background:
- Selective immunoglobulin M (IgM) deficiency is a primary immunodeficiency.
- It is characterized by low or undetectable IgM levels with normal other immunoglobulin isotypes.
- This condition predisposes individuals to recurrent infections.
Observation:
- A 3-month-old Standardbred colt presented with chronic respiratory disease.
- Blood tests revealed normal IgG and IgA but undetectable IgM.
- Lymphocyte stimulation assays showed normal T-cell responses but a lack of B-cell response to lipopolysaccharide.
Findings:
- The colt was diagnosed with selective IgM deficiency.
- The B-cell defect was suggested by the lack of response to B-cell mitogens.
- This mirrors findings in human immunodeficiency disorders.
Implications:
- This case highlights a potential B-cell defect as the cause of selective IgM deficiency in horses.
- Understanding this defect can aid in diagnosing and managing similar cases in equine populations.
- Further research may elucidate the specific genetic or cellular mechanisms underlying this condition in horses.