Journal
IMMUNITY INFLAMMATION AND DISEASE
Volume 4, Issue 1, Pages 35-44Publisher
WILEY
DOI: 10.1002/iid3.90
Keywords
Death receptor signaling; neutrophils; TNF receptors
Categories
Funding
- Arthritis Research UK [19437]
- Biotechnology and Biological Sciences Research Council (UK), United Kingdom [BB/H016163/1]
- Integrated Innovation Academic Center (IIAC) [CU56-HR05]
- Chulalongkorn University Centenary Academic Development Project [CU56-HR05]
- MRC [MR/M01665X/1] Funding Source: UKRI
- Medical Research Council [MR/M01665X/1] Funding Source: researchfish
- Versus Arthritis [19437] Funding Source: researchfish
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Responses of human neutrophils to TNF-alpha are complex and multifactorial. Exposure of human neutrophils to TNF-alpha in vitro primes the respiratory burst, delays apoptosis and induces the expression of several genes including chemokines, and TNF-alpha itself. This study aimed to determine the impact of TNF-a exposure on the expression of neutrophil genes and proteins that regulate apoptosis. Quantitative PCR and RNA-Seq, identified changes in expression of several apoptosis regulating genes in response to TNF-alpha exposure. Up-regulated genes included TNF-alpha itself, and several anti-apoptotic genes, including BCL2A1, CFLAR (cFLIP) and TNFAIP3, whose mRNA levels increased above control values by between 4-20 fold (n = 3, P < 0.05). In contrast, the expression of pro-apoptotic genes, including CASP8, FADD and TNFRSF1A and TNFRSF1B, were significantly down-regulated following TNF-alpha treatment. These changes in mRNA levels were paralleled by decreases in protein levels of caspases 8 and 10, TRADD, FADD, TNFRSF1A and TNFRSF1B, and increased cFLIP protein levels, as detected by western blotting. These data indicate that when neutrophils are triggered by TNF-alpha exposure, they undergo molecular changes in transcriptional expression to up-regulate expression of specific anti-apoptotic proteins and concomitantly decrease expression of specific proteins involved in death receptor signaling which will alter their function in TNF-alpha rich environments.
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