Abstract:
:Age-dependent poliomyelitis (ADPM) is a virally induced neuroparalytic disease of mice and a model for amyotrophic lateral sclerosis (ALS). ADPM is triggered in genetically susceptible mice by immunosuppression and infection with lactate dehydrogenase-elevating virus (LDV). Both ADPM and ALS are characterized by progressive degeneration of anterior horn motor neurons, and death in ALS is usually associated with respiratory failure. To assess respiratory function in ADPM, we investigated ventilation in conscious control and LDV-infected C58/J mice breathing air and then 6.5% CO(2) in O(2). Three days after LDV infection, ventilation in response to CO(2) was half of that compared to the uninfected state, but become normalized by 10 days. Administration of cyclophosphamide alone (200 mg/kg, ip), an immunosuppressant, had no effect on ventilation. Induction of ADPM by concomitant administration of LDV to cyclophosphamide-treated mice resulted in altered gait, hindlimb paralysis, wasting, decreased metabolism, and decreased body temperature by 4 degrees C relative to controls. Compared to baseline values, mice with ADPM had decreased tidal volume and ventilation while breathing air, and while exposed to the CO(2) challenge they were unable to increase tidal volume, frequency of breathing, or ventilation. Using in situ hybridization, LDV replication was noted within the spinal cord, brain, and lung, but not in the diaphragm. Thus, respiratory failure is a contributory mechanism leading to death in ADPM and is associated with LDV replication in the CNS and lung. This animal model may be useful to investigate physiological and molecular mechanisms associated with the development of respiratory failure in neurodegenerative diseases.
journal_name
J Neuroviroljournal_title
Journal of neurovirologyauthors
Schlenker EH,Jones QA,Rowland RR,Steffen-Bien M,Cafruny WAdoi
10.1080/13550280152403308subject
Has Abstractpub_date
2001-06-01 00:00:00pages
265-71issue
3eissn
1355-0284issn
1538-2443journal_volume
7pub_type
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