(-)-α-Bisabolol inhibits D-Gal-induced HSF cellular senescence in vitro and prevents skin aging in vivo by reducing SASP

Document Type : Original Article

Authors

1 The Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou, China

2 Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou, China

3 Research and Development Department, Guangzhou Qinglan Biotechnology Company Limited, Guangzhou, China

4 State Key Laboratory of Dampness Syndrome of Chinese Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China

5 Guangdong Academy of Traditional Chinese Medicine, Research Team of Bio-molecular and System Biology of Chinese Medicine, Guangzhou, China

6 Guangdong Provincial Key Laboratory of Clinical Research on Traditional Chinese Medicine Syndrome, Guangzhou, China

7 Guangdong-Hong Kong-Macau Joint Lab on Chinese Medicine and Immune Disease Research, Guangzhou University of Chinese Medicine, Guangzhou, China

Abstract

Objective(s): To study the anti-aging effect of (-)-α-bisabolol ((-)-α-bis) on the skin and preliminarily clarify its mechanism. 
Materials and Methods: Human skin fibroblasts (HSF) were induced senescence by D-Galactose. Senescence β-galactosidase staining was utilized to evaluate the senescence of HSF. TNF-α, IL-6, IL-8, IL-1β, CCL-2, CCL-5, and MMP-9 in senescence-as-sociated secretory phenotype (SASP) were detected by RT-qPCR. Meanwhile, aged BALB/c mice were applied topically with 0.5% and 2%(-)-α-bis gel for 30 days continuously to evaluate anti-aging parameters on the skin such as surface measurement, the Trans Epidermal Water Loss (TEWL), and skin barrier index of dorsal skin. Then, HE staining, Masson staining, and IHC were applied to measure epidermal thickness, collagen fiber content in the dermis, and content of dermal collagen I, respectively. Last, SOD, MDA, and HYP contents of the back skin tissue of mice were also detected. 
Results: (-)-α-Bis reduced the expression of senescence-associated β-galactosidase (SA-β-gal) and expression levels of SASP in HSF cells stimulated by D-Gal (P<0.05). Mice aged 9 months were applied locally with (-)-α-bis gel to improve skin aging, the TEWL and skin barrier index of dorsal skin, and ameliorate the epidermal thickness and contents of dermal collagen fibers and collagen I (P<0.05). Furthermore, (-)-α-bis up-regulated the mRNA expression levels of elastin and collagen III effectively (P<0.05). 
Conclusion: (-)-α-Bis can delay the senescence of HSF cells by reducing the expression of SA-β-gal and SASP factors in vitro. Improved skin barrier function as well as SASP is responsible for the delay of skin aging in vivo.

Keywords

Main Subjects


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