Saikosaponin A and Saikosaponin C Reduce TNF-α-Induced TSLP Expression through Inhibition of MAPK-Mediated EGR1 Expression in HaCaT Keratinocytes

International Journal of Molecular Sciences

Young Han Lee¹  Hyunjin Yeo¹  Soon Young Shin¹  Sung Shin Ahn¹  Euitaek Jung¹  Yoongho Lim² 

[1] Department of Biological Sciences, Sanghuh College of Lifesciences, Konkuk University, Seoul 05029, Korea;Division of Bioscience and Biotechnology, BMIC, Konkuk University, Seoul 05029, Korea;

关键词: atopic dermatitis;    saikosaponin;    early growth response 1;    mitogen-activated protein kinase;    thymic stromal lymphopoietin;    tumor necrosis factor-α;   

DOI  :  10.3390/ijms23094857

来源: DOAJ

【 摘 要 】

Atopic dermatitis (AD) is one of the most common chronic inflammatory skin diseases worldwide, characterized by intense pruritus and eczematous lesions. Aberrant expression of thymic stromal lymphopoietin (TSLP) in keratinocytes is associated with the pathogenesis of AD and is considered a therapeutic target for the treatment of this disease. Saikosaponin A (SSA) and saikosaponin C (SSC), identified from Radix Bupleuri, exert anti-inflammatory effects. However, the topical effects of SSA and SSC on chronic inflammatory skin diseases are unclear. In this study, we investigated the effects of SSA and SSC on TSLP suppression in an AD-like inflammatory environment. We observed that SSA and SSC suppressed tumor necrosis factor-α-induced TSLP expression by downregulating the expression of the transcription factor early growth response 1 (EGR1) via inhibition of the extracellular signal-regulated kinase 1/2, c-Jun N-terminal kinase 1/2, and p38 mitogen-activated protein kinase pathways. We also confirmed that topical application of SSA or SSC reduced AD-like skin lesions in BALB/c mice challenged with 2,4-dinitrochlorobenzene. Our findings suggest that suppression of EGR1-regulated TSLP expression in keratinocytes might be attributable to the anti-inflammatory effects of SSA and SSC in AD-like skin lesions.

【 授权许可】

Unknown