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Objective Sebum metabolism disorders are a key contributing factor to various dermatological conditions. As an emerging class of microbial agents, postbiotics show potential in regulating metabolic processes. This study aimed to investigate the efficacy and mechanisms of Lacticaseibacillus paracasei CCFM1224 postbiotics in alleviating sebum metabolism disorders and explore the active components responsible for the effects. Methods Using a mouse model of oleic acid-induced sebum metabolism disorders, we comprehensively evaluated the efficacy of CCFM1224 postbiotics in ameliorating sebum imbalance. This evaluation encompassed phenotypic measurements, hormonal parameters, and skin lipid content. Changes in the expression of genes related to skin lipid metabolism were measured via real-time quantitative PCR. Subsequently, a free fatty acid-induced lipid accumulation model in HepG2 cells was utilized to screen the active components of postbiotics. Results CCFM1224 postbiotics significantly ameliorated sebum metabolism disorders in mice. This was evidenced by mitigated abnormal weight gain, a reduced testicle index, alleviated histopathological skin damage, and decreased levels of inflammatory cytokines (IL-6, IL-1β, and TNF-α) as well as triglyceride (TG) and non-esterified fatty acid (NEFA) in the skin tissue. CCFM1224 postbiotics modulated sebum metabolism by downregulating the expression of lipogenesis-related genes (FASN, PPAR-γ, and SREBP-1c) and upregulating the expression of lipolysis-related genes (PPAR-α, HSL, and ATGL). Further cellular validation identified the inactivated bacterial cell component as the key functional fraction, which effectively alleviated intracellular lipid accumulation and associated damage, thereby clarifying the material basis for the effects of CCFM1224 postbiotics. Conclusion L. paracasei CCFM1224 ameliorate sebum metabolism disorders by modulating hormone secretion and lipid metabolic pathways. The key bioactive components were identified as the inactivated bacterial cells, rather than the fermentation supernatant. This finding provides a theoretical foundation for the application of postbiotics in regulating lipid metabolism disorders and establishes a basis for developing related functional microbial preparations.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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