Solanum tuberosum L. cv Jayoung Epidermis Extract Inhibits Mite Antigen-Induced Atopic Dermatitis in NC/Nga Mice by Regulating the Th1/Th2 Balance and Expression of Filaggrin.

Solanum tuberosum L. cv Jayoung (JY) is a potato with dark purple flesh and contains substantial amounts of polyphenols. In this study, we evaluated the therapeutic effects of S. tuberosum L. cv JY in a mouse model of Dermatophagoides farinae body (Dfb)-induced atopic dermatitis (AD). The ethanol extract of the peel of JY (EPJ) ameliorated Dfb-induced dermatitis severity, serum levels of immunoglobulin E (IgE) and thymus and activation-regulated chemokine. Histological analysis of the skin also revealed that EPJ treatment significantly decreased mast cell infiltration. The suppression of dermatitis by EPJ treatment was accompanied by a decrease in the skin levels of type 2 helper T-cell cytokines such as interleukin (IL)-4, IL-5, and IL-13. The induction of thymic stromal lymphopoietin, which leads to a systemic Th2 response, was also decreased in the skin by EPJ. Nuclear translocation of nuclear factor-κB p65 was decreased by EPJ in Dfb-induced NC/Nga mice. The protein expression of filaggrin in the AD-like skin lesions was restored by EPJ treatment. These results suggested that EPJ may be a potential therapeutic tool for the treatment of AD.

Chloroform fraction of Solanum tuberosum L. cv Jayoung epidermis suppresses LPS-induced inflammatory responses in macrophages and DSS-induced colitis in mice.

In this study, the authors investigated the molecular mechanism underlying the antiinflammatory effects of the chloroform fraction of the peel of 'Jayoung' (CFPJ), a color-fleshed potato, on lipopolysaccharide (LPS)-induced RAW 264.7 macrophages and in mice with dextran sulfate sodium (DSS)-induced colitis. CFPJ inhibited the expressions of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) at the transcription level, and attenuated the transcriptional activity of nuclear factor-κB (NF-κB) by reducing the translocation of NF-κB depending on degradation of inhibitory κB-α (IκB-α). Furthermore, CFPJ attenuated the phosphorylations of mitogen-activated protein kinase kinases3/6 (MKK3/6) and of p38. In colitis model, CFPJ significantly reduced the severity of colitis and the productions and protein levels of pro-inflammatory mediators in colonic tissue. These results suggest that the anti-inflammatory effects of CFPJ are associated with the suppression of NF-κB and p38 activation in macrophages, and support its possible therapeutic role for the treatment of colitis.