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Citrus p -Synephrine Improves Energy Homeostasis by Regulating Amino Acid Metabolism in HFD-Induced Mice.
Nutrients 2024 January 13
p -Synephrine is a common alkaloid widely distributed in citrus fruits. However, the effects of p -synephrine on the metabolic profiles of individuals with energy abnormalities are still unclear. In the study, we investigated the effect of p -synephrine on energy homeostasis and metabolic profiles using a high fat diet (HFD)-induced mouse model. We found that p -synephrine inhibited the gain in body weight, liver weight and white adipose tissues weight induced by HFD. p -Synephrine supplementation also reduced levels of serum total cholesterol (TC), triglyceride (TG) and low-density lipoprotein cholesterol (LDL-C) but not to a statistically significant degree. Histological analysis showed that HFD induced excessive lipid accumulation and glycogen loss in the liver and adipocyte enlargement in perirenal fat tissue, while p -synephrine supplementation reversed the changes induced by HFD. Moreover, HFD feeding significantly increased mRNA expression levels of tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) and reduced the mRNA expression level of interleukin-10 (IL-10) compared to the control group, while p -synephrine supplementation significantly reversed these HFD-induced changes. Liver and serum metabolomic analysis showed that p -synephrine supplementation significantly altered small molecule metabolites in liver and serum in HFD mice and that the changes were closely associated with improvement of energy homeostasis. Notably, amino acid metabolism pathways, both in liver and serum samples, were significantly enriched. Our study suggests that p -synephrine improves energy homeostasis probably by regulating amino acid metabolism in HFD mice, which provides a novel insight into the action mechanism of p -synephrine modulating energy homeostasis.
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