Palmitic Acid Induces Inflammatory Environment and Is Involved in Pyroptosis in a Human Dental Pulp Cell Line

Area of Science:

• Cell Biology
• Immunology
• Biochemistry

Background:

• Dental pulp inflammation is a common clinical issue.
• Palmitic acid (PA) is a saturated fatty acid implicated in various inflammatory processes.
• Understanding PA's role in dental pulp cells is crucial for developing targeted therapies.

Purpose of the Study:

• To investigate the effect of palmitic acid (PA) on inflammatory cytokine expression in human dental pulp cells.
• To determine if PA induces pyroptosis, a form of programmed cell death, in these cells.

Main Methods:

• Human dental pulp cells were treated with varying concentrations of PA and lipopolysaccharide (LPS).
• Cell viability was assessed using the WST-1 assay, and morphological changes were observed.
• Quantitative RT-PCR (qPCR) was used to measure the RNA expression of key inflammatory cytokines (IL-1β, IL-6, TNF-α) and pyroptosis-related genes (caspase-4, gasdermin d).

Main Results:

• Palmitic acid (PA) significantly reduced cell viability and caused morphological changes in dental pulp cells at higher concentrations.
• PA treatment led to significantly increased RNA expression of IL-1β, IL-6, caspase-4, and gasdermin d.
• Concentrations of IL-1β and IL-6 were significantly elevated in cells treated with both LPS and PA.

Conclusions:

• Palmitic acid (PA) induces the expression of pro-inflammatory cytokines in human dental pulp cells.
• PA is involved in the induction of pyroptosis in this cell line.
• These findings highlight PA as a potential contributor to dental pulp inflammation and cell death.