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. 1996 Oct;60(4):257–262.

Polymerase chain reaction analysis of TNF-alpha and IL-6 mRNA levels in whole blood from cattle naturally or experimentally infected with Mycobacterium paratuberculosis.

J L Adams 1, M T Collins 1, C J Czuprynski 1
PMCID: PMC1263846  PMID: 8904661

Abstract

Johne's disease is characterized by a chronic enteritis that results in granulomatous inflammation, cachexia, and eventual death of cattle infected with Mycobacterium paratuberculosis. The cytokines tumor necrosis factor-alpha (TNF-alpha) and interleukin-6 (IL-6) have been associated with granuloma formation and wasting in other disease syndromes. The potential role of these cytokines in the development and progression of Johne's disease has not been investigated. Using the polymerase chain reaction (PCR) and specific bovine oligonucleotide cytokine primers and probes, we examined the expression of messenger RNA for these cytokines in whole blood from M. paratuberculosis infected and uninfected cattle. Cytokine mRNA levels were examined before and after in vitro incubation with E.coli lipopolysaccharide (LPS) and lipoarabinomannan (LAM) purified from M. paratuberculosis. Uninfected calves, experimentally infected calves, and naturally infected cattle all displayed similar cytokine mRNA expression patterns. However, individual animals demonstrated variability in the levels of IL-6 and TNF-alpha mRNA expression as determined by a semiquantitative PCR method using 32P-labelled oligonucleotide probes.

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Selected References

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