HM018 derived from breast milk ameliorates hyperlipidemia in high-cholesterol rats by modulating bile acid metabolism.

INTRODUCTION

Hyperlipidemia, a prevalent metabolic disorder with rising global incidence, has become a major public health concern. Probiotics allow for a mild intervention strategy for hyperlipidemia management that has garnered increasing attention.

METHODS

In this study, we investigated the therapeutic effects and underlying mechanisms of HM018 in hypercholesterolemic rats.

RESULTS AND DISCUSSION

We established three dosage groups (2.5 × 10, 5 × 10, and 1.5 × 10 CFU/rat), demonstrating that HM018 significantly reduced high-fat diet-induced serum total cholesterol, triglycerides, and low-density lipoprotein cholesterol levels, while ameliorating gut microbiota dysbiosis and decreasing the / ratio. Our transcriptomic analysis revealed that HM018 markedly upregulated expression both in the ileum and liver, while enhancing / gene expression to promote -sitosterol efflux. Concurrently, hepatic and gene expression was downregulated, attenuating their inhibitory effects on hormonal and glucagon signaling, thereby improving glucose and lipid metabolism. Metabolomic profiling further indicated that HM018 significantly altered bile acid composition by modulating gut microbiota-mediated bile acid metabolism. In conclusion, HM018 could ameliorate hyperlipidemia through multiple pathways, including gut microbiota modulation, hepatic lipid/glucose/bile acid metabolism improvement, and intestinal cholesterol efflux gene expression enhancement.