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Demyelinating canine distemper encephalomyelitis: measurement of myelin basic protein in cerebrospinal fluid
Abstract:
Beagle dogs were experimentally infected with the Cornell A75-17 strain of canine distemper virus. At three time points post-infection (PI), immunoreactive myelin basic protein (MBP) was measured in cerebrospinal fluid (CSF). Levels were correlated with neuropathological findings, interferon in CSF and virus isolation from the brain. CSF from animals inoculated with Cornell A75-17 strain often showed detectable immunoreactive MBP late in the disease course. As anticipated from earlier morphological studies, CSF drawn around day 20 PI lacked MBP while subsequent samples were positive. Dogs with severe demyelination had elevated values of immunoreactive MBP while dogs with only mild inflammation had little or none. Release of MBP or MBP peptides into CSF of dogs with canine distemper may be a valuable laboratory test in studies of the natural history of this disease and in assessing the response to treatment. Whether an immune response to MBP plays an immunopathogenic role in the chronic, demyelinating phase of canine distemper encephalitis remains to be determined.
Insights
Myelin basic protein (MBP) in cerebrospinal fluid (CSF) can indicate canine distemper severity. Elevated MBP levels in CSF correlate with demyelination, offering a potential diagnostic marker for this viral disease in dogs.
Area of Science:
- Veterinary Neurology
- Immunology
- Virology
Background:
- Canine distemper virus (CDV) causes significant neurological disease in dogs.
- Demyelination is a key pathological feature of canine distemper encephalitis.
- Myelin basic protein (MBP) is a major component of myelin and a marker of myelin breakdown.
Purpose of the Study:
- To investigate the presence and significance of immunoreactive myelin basic protein (MBP) in the cerebrospinal fluid (CSF) of dogs experimentally infected with canine distemper virus (CDV).
- To correlate MBP levels in CSF with neuropathological findings, interferon levels, and viral presence in the brain.
- To evaluate the potential of CSF MBP as a diagnostic biomarker for canine distemper.
Main Methods:
- Beagle dogs were experimentally infected with the Cornell A75-17 strain of CDV.
- Cerebrospinal fluid (CSF) samples were collected at multiple time points post-infection (PI).
- Immunoreactive MBP levels in CSF were measured and correlated with neuropathological assessments, CSF interferon, and brain virus isolation.
Main Results:
- Detectable immunoreactive MBP was frequently observed in the CSF of infected dogs, particularly late in the disease course.
- MBP levels in CSF were significantly elevated in dogs with severe demyelination compared to those with mild inflammation.
- CSF samples drawn around day 20 PI initially lacked MBP, with positivity emerging in subsequent samples.
Conclusions:
- The release of MBP or its peptides into the CSF of dogs with canine distemper appears to be a reliable indicator of demyelination.
- Measuring immunoreactive MBP in CSF may serve as a valuable laboratory test for monitoring the natural history of canine distemper and assessing treatment efficacy.
- The potential immunopathogenic role of an immune response to MBP in the chronic demyelinating phase requires further investigation.