Trichostatin A inhibits dendritic cell maturation through down-regulating NF-κ B (p65) pathway

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• Histone deacetylase inhibitors (HDACi) are known to inhibit dendritic cell (DC) maturation.
• The precise molecular mechanisms underlying this inhibition remain largely unclear.

Purpose of the Study:

• To investigate whether Trichostatin A (TSA), a prominent HDACi, inhibits DC maturation via the NF-κB (p65) signaling pathway.

Main Methods:

• Mouse bone marrow-derived DCs were stimulated with lipopolysaccharide (LPS).
• TSA and a p65 inhibitor (Triptolide, TTL) were used to assess effects on DC maturation, T cell proliferation, and cytokine secretion.
• Western blot and RT-qPCR were employed to analyze the NF-κB pathway components.

Main Results:

• TSA and TTL independently inhibited LPS-induced DC maturation, affecting cell morphology and phenotype.
• TSA and TTL synergistically suppressed T lymphocyte proliferation and modulated pro-inflammatory (IL-12) and anti-inflammatory (IL-10) cytokine secretion.
• TSA treatment led to decreased expression of phosphorylated IκBα, phosphorylated-p65, Ikkβ, and Ikkγ, indicating NF-κB pathway downregulation.

Conclusions:

• TSA effectively inhibits dendritic cell maturation.
• This inhibition occurs through the downregulation of the NF-κB (p65) signaling pathway.