Abstract
Pterocarpus santalinus has been traditionally used as a medicinal plant owing to its anti-inflammatory,
anthelmintic, tonic, antihyperglycemic, and diaphoretic properties. We hypothesized
that P. santalinus might have therapeutic potential in alleviating allergy and atopic dermatitis. Thus,
we investigated the inhibitory effects of P. santalinus extract against allergic responses and 2,4-dinitrochlorobenzene-induced atopic dermatitis-like
dorsal skin lesions using immunoglobulin E-sensitized rat basophilic leukemia-2H3
mast cells and NC/Nga mice. Degranulation and enzyme-linked immunosorbent assays were
conducted to measure degranulation, proinflammatory cytokine levels, and prostaglandin
E2 concentrations in immunoglobulin E/antigen-sensitized RBL-2H3 mast cells. The therapeutic
efficacy of P. santalinus extract in 2,4-dinitrochlorobenzene-induced atopic dermatitis was evaluated through
morphological, physiological, and immunological analysis. P. santalinus extract inhibited β-hexosaminidase and histamine release and reduced tumor necrosis factor-α, interleukin-4, and prostaglandin E2 secretion. Furthermore, P. santalinus extract suppressed atopic dermatitis-like skin lesions by regulating the serum levels
of immunoglobulin E and immunoglobulin G2a, and messenger ribonucleic acid expression
of T helper cell 1- and T helper cell 2-related mediators in the skin lesions. Histopathological
analyses showed a decrease in epidermal thickness and intradermal inflammatory cell
infiltration. These results suggested that P. santalinus extract might have beneficial effects in treating allergic and atopic dermatitis-like
skin disorders.
Key words
Pterocarpus santalinus
- Leguminosae - RBL-2H3 mast cell - atopic dermatitis - IgE - Th1/Th2-related mediators