Effects of Lactobacillus kefiri fermentation supernatant on skin aging caused by oxidative stress. (September 2022)

• Record Type: Journal Article
• Authors: Zhang, Yuzhi; Liu, Pingping; Fu, Hao; Wang, Dongdong; Zhao, Dan; Zhang, Jiachan; Wang, Changtao; Li, Meng
• Is Part Of: Journal of functional foods. Volume 96(2022)
• Publication Date: 2022-09
• Subjects: Lactobacillus kefiri -- Fermentation broth -- Skin aging -- Oxidative stress -- Human fibroblasts; Functional foods -- Analysis -- Periodicals; Food -- Biotechnology -- Periodicals; Nutrition -- Periodicals; 613.2
• DOI: 10.1016/j.jff.2022.105222
• Languages: English
• ISSNs: 1756-4646

Abstract

Graphical abstract: Highlights: Lactobacillus kefiri fermentation components(LAF) shows excellent antioxidant effect in vitro. Achievements of Lactobacillus kefiri fermentation components providing more possibilities for their application as functional raw materials in cosmetics. LAF can regulate the expression of oxidative stress, autophagy, and aging-related genes in damaged cells treated with H2 O2, thereby delaying cell senescence. Abstract: Lactobacillus kefiri is a beneficial bacteria that is often used to make yogurt only, and is beneficial to human health when it is used in food fermentation. In this article, a fermentation supernatant (LAF) is prepared by culturing Lactobacillus kefiri, and the anti-aging effects of LAF are evaluated at the biochemical, cellular, and molecular biology levels. The antioxidant activity of LAF is comprehensively evaluated by three free radical scavenging tests and the total antioxidant capacity (ABTS method) test. The toxicity of LAF on human skin fibroblasts (HSF) is detected using the MTT method, and the effects of LAF on H2 O2 -induced oxidative stress in terms of intracellular reactive oxygen species (ROS), Malondialdehyde (MDA) content, antioxidant enzyme activity are evaluated. The gene expression levels of LC3 and Beclin-1 are detected using the real-time reverse transcription-polymerase chain reaction (qRT-PCR) method, and the protein expression levels of LC3 are detected using the Western blot method to evaluate the effects of LAF on HSF autophagy. The expression of type I collagen (COL-1), Matrix metalloproteinase-1(MMP-1), AKT pathway, MAPK pathway, and other genes are detected by qRT-PCR to study the anti-aging effects of LAF. From the experimental results, it is found that LAF can delay the aging of HSF at the biochemical, cellular, and molecular biology levels, and can be utilized as a functional food ingredient.