Cyclosporin A and phenytoin modulate inflammatory responses

Area of Science:

• Immunology
• Pharmacology
• Cell Biology

Background:

• Gingival overgrowth is a common side effect of cyclosporin A (immunosuppressant) and phenytoin (anti-epileptic).
• Cyclosporin-induced overgrowth involves inflammation, whereas phenytoin-induced overgrowth is typically fibrotic.
• The impact of these drugs on gingival fibroblast inflammatory responses remains unclear.

Purpose of the Study:

• To investigate the effects of cyclosporin A and phenytoin on Toll-like receptor (TLR)-mediated inflammatory responses in gingival fibroblasts.
• To elucidate the distinct mechanisms by which these drugs modulate fibroblast inflammatory signaling.

Main Methods:

• Utilized Chinese hamster ovary (CHO) reporter cell lines to assess TLR signaling.
• Examined the effects of cyclosporin A and phenytoin on human gingival fibroblasts stimulated with TLR ligands (TLR2, TLR4).
• Analyzed the expression of CD54 and production of interleukin-6 (IL-6) and IL-8.
• Investigated cyclosporin A's effect on CD54 expression in mouse gingiva.

Main Results:

• Cyclosporin A alone triggered signaling in CHO reporter cells.
• Phenytoin down-regulated TLR2 and TLR4 ligand-induced signaling in CHO reporter cells.
• In human gingival fibroblasts, cyclosporin A augmented TLR ligand-induced CD54 expression, IL-6, and IL-8 production.
• Phenytoin attenuated TLR ligand-induced inflammatory responses in human gingival fibroblasts.
• Cyclosporin A increased CD54 expression in lipopolysaccharide-stimulated mouse gingiva.

Conclusions:

• Cyclosporin A positively modulates inflammatory responses of human gingival fibroblasts.
• Phenytoin negatively modulates inflammatory responses of human gingival fibroblasts.
• These findings provide insights into the differential mechanisms of drug-induced gingival overgrowth.