IL-12 affects Dermatophagoides farinae-induced IL-4 production by T cells from pediatric patients with mite-sensitive asthma
Summary
This summary is machine-generated.Low-dose IL-12 (Interleukin-12) downregulates IL-4 (Interleukin-4) and IgE production, while high-dose IL-12 enhances both, impacting mite-sensitive asthma in infants. This suggests IL-12 dose is critical in immune responses.
Area Of Science
- Immunology
- Molecular Biology
- Allergy Research
Background
- Interleukin-12 (IL-12) is a key cytokine produced by phagocytic cells during microbial infections, crucial for immune regulation.
- Understanding IL-12's role is vital for immune response modulation.
Purpose Of The Study
- To investigate the differential effects of low-dose versus high-dose IL-12 on TH1 and TH2 cytokine expression.
- To elucidate the role of IL-12 in the pathogenesis of mite antigen-sensitive bronchial asthma in infants.
Main Methods
- Studied the impact of IL-12 on Dermatophagoides farinae (Df) antigen-induced IL-4 and IgE production in peripheral blood mononuclear cells (PBMCs) from pediatric asthma patients.
- Utilized RT-PCR with laser-induced fluorescence for mRNA expression analysis of IL-4 and IFN-gamma.
Main Results
- Low-dose IL-12 (0.05-0.1 ng/mL) downregulated Df-induced IL-4 production and IgE, while high-dose IL-12 (1-10 ng/mL) enhanced them.
- IFN-gamma production was dose-dependently enhanced by IL-12 in patient PBMCs.
- High-dose IL-12 promoted simultaneous IL-4 and IFN-gamma production, unlike low-dose IL-12 which induced reciprocal regulation.
Conclusions
- Both low and high doses of IL-12 can induce TH1 responses.
- High-dose IL-12 induces both TH1 and TH2/TH0 responses, potentially leading to IL-4 production that may override TH1-mediated IgE production in mite-sensitive asthma.
View abstract on PubMed