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. 1995 Nov;2(6):665–671. doi: 10.1128/cdli.2.6.665-671.1995

Cloning of porcine cytokine-specific cDNAs and detection of porcine tumor necrosis factor alpha, interleukin 6 (IL-6), and IL-1 beta gene expression by reverse transcription PCR and chemiluminescence hybridization.

S A Vézina 1, D Roberge 1, M Fournier 1, S Dea 1, D Oth 1, D Archambault 1
PMCID: PMC170217  PMID: 8574826

Abstract

A reverse transcription PCR assay with porcine cytokine-specific primers was developed to clone cDNA fragments and generate cDNA probes that were specific for porcine tumor necrosis factor alpha (TNF-alpha), interleukin 6 (IL-6), and IL-1 beta. The specificities of the cDNA PCR products were confirmed by sequence analysis on the basis of known porcine cytokine gene sequences. The reverse transcription PCR assay was also used to study cytokine mRNA expression in lipopolysaccharide (LPS)-stimulated and control unstimulated porcine alveolar macrophages. The cDNA products were analyzed in ethidium bromide-stained agarose gels, and the transcription level of each cytokine was determined relative to the endogenous glyceraldehyde-3-phosphate dehydrogenase (GAPDH) RNA level of each cytokine by measuring the intensity of the chemiluminescence hybridization signals by densitometric scanning. Various levels of cytokine mRNAs were detected in both LPS-stimulated and control unstimulated cells. Thus, TNF-alpha mRNA levels were enhanced in the cell cultures stimulated for 6 h with LPS compared with those in control cell cultures. No differences in TNF-alpha transcription levels between LPS-stimulated and control cells were observed after incubation for 24 or 55 h. Enhancements of IL-6 and IL-1 beta mRNA levels were also observed in the cultures stimulated with LPS for 6 and 24 h compared with the cytokine mRNA levels in control cell cultures. The presence of cytokine mRNA transcripts in the LPS-stimulated macrophage cultures correlated with the detection of these soluble cytokines by the bioassays. In contrast, no soluble cytokine was detected in control macrophage culture supernatants in the presence of cytokine mRNA transcripts.

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Selected References

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