Promotion of hair growth by Lactobacillus and fermented traditional Korean berry in C57BL/6 mice

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Hair loss is the state of losing hair from the scalp or entire body when new hair does not replace the hair that has fallen out. Currently, remedies such as oral finasteride and topical minoxidil are commonly used. However, these drugs may have temporary effects and cause side effects such as depression, irregular heartbeat and weight gain when used long term. Therefore, an alternative hair growth promoting agent is needed. The hair follicle undergoes anagen, catagen, and telogen phase which affect hair growth, and this hair-growth cycle is regulated by growth factors, cytokines, and hormones. Some studies reported that the gut microbiome (GM) regulates the transition between the hair growth cycle by producing hair growth-related factors and nutrients. Also, inflammation by GM affects the cascade of the inflammation in the hair follicle, which may lead to hair growth arrest. Previous studies showed strains of Lactobacillus (LAB) have anti-oxidative and anti-inflammatory effects in an HT-29 human colon epithelial cell model and an HaCaT human keratinocyte cell model. Also, traditional Korean berry has anti-inflammatory effects in an HT-29 model. Thus, LAB and fermented traditional Korean berry by LAB (FB) may promote hair growth by regulating gut microbiome. This study investigated the effect of LAB and FB on hair growth in vivo. Six-week-old male C57BL/6 mice were used for evaluating the hair growth-promoting effects of the LAB and FB. The dorsal hair of mice was depilated, and they were orally treated with LAB at 1010 CFU/kg and FB at 250mg/kg daily for 22 days. As a result, the hair re-growth rate was significantly increased in LAB and FB groups compared with the control group. In the histological analysis of skin, FB increased the number of hair follicle and subcutaneous fat layer thickness. The mRNA expression levels of hair growth-related growth factors such as VEGF and IGF-1 are significantly increased in colon and skin. Moreover, Treatment of LAB and FB changed the composition of the microbiome and short chain fatty acids in mice. Altogether, LAB and FB supplementation may promote hair growth by regulating growth factors and altering gut microbiota compositions. In conclusion, strain of LAB and FB are potential novel approaches for hair growth promotion. This work was supported by Korea Testing Laboratory This is the full abstract presented at the American Physiology Summit 2023 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.