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Depletion of CD4 T lymphocytes at the time of infection with M. avium subsp. paratuberculosis does not accelerate disease progression

A. J. Allen, J. R. Stabel, S. Robbe-Austerman, K. T. Park, M. V. Palmer, G. M. Barrington, K. K. Lahmers, Mary Jo Hamilton, William C. Davis
Veterinary immunology and immunopathology 2012 v.149 no.3-4 pp. 286-291
Mycobacterium avium subsp. paratuberculosis, T-lymphocytes, antibodies, biopsy, bulls, calves, cannulas, disease course, feces, ileum, immune response, intravenous injection, models, paratuberculosis
A calf model was used to determine if the depletion of CD4 T cells prior to inoculation of Mycobacterium avium subsp. paratuberculosis (Map) would delay development of an immune response to Map and accelerate disease progression. Ileal cannulas were surgically implanted in 5 bull calves at 2 months of age. Two calves were depleted of CD4 T cells by intravenous injection of anti-bovine CD4 antibody administered 24h prior to inoculation with Map. The two CD4-depleted calves and one non-depleted calf were inoculated via ileal cannula with 1 × 10(8)cfu live Map every 3 days for a total of 4 inoculations. Two additional calves served as non-depleted and uninfected controls. Injection with the anti-CD4 mAb reduced the frequency of CD4 T cells from a pre-depletion average of 15% to less than 1% in PBMC at 24h. However, a consistent proliferative response dominated by CD4 T cells, developed in both treated and untreated calves over the course of the 6-month study period. Recovery of Map from serial biopsies obtained from the CD4-depleted and non-depleted calves after Map infection did not differ. In addition, CD4 depletion did not increase the level of Map shed in the feces over the non-depleted animal.