Lipid Metabolism

Overview

Lipid metabolism — the synthesis, transport, and degradation of fats — is profoundly modulated by both the gut microbiome and metal homeostasis. The microbiome influences lipid metabolism through bile acid transformation, SCFA production, TMAO generation, and direct enzymatic modification of dietary lipids. Metals affect lipid metabolism through oxidative modification (lipid peroxidation), enzyme cofactor roles, and disruption of hepatic lipid processing.

Microbiome-Lipid Interactions

  • Bile acid metabolism: Gut bacteria deconjugate and transform primary bile acids into secondary bile acids (deoxycholic acid, lithocholic acid), which act as signaling molecules via FXR and TGR5 receptors, regulating cholesterol synthesis and fat absorption [1].
  • TMAO production: Microbial metabolism of choline/carnitine → trimethylamine → hepatic oxidation to TMAO, which promotes atherosclerosis [2].
  • SCFA and lipogenesis: short chain fatty acids (particularly propionate and butyrate) modulate hepatic lipogenesis and adipose tissue metabolism.
  • Sex-specific effects: Gut microbiome composition differs by sex, with distinct lipid metabolism implications for CVD risk [3].

Metal Interference

  • Heavy metals (cadmium, lead, mercury) disrupt hepatic lipid processing enzymes, promoting dyslipidemia [4].
  • Fatty acid profiles: Altered in diabetic ED patients, with implications for endothelial function and NO signaling [5].
  • High-fat diet + metal exposure compounds gut microbiota disruption and lipid dysregulation [6].

Cross-References

References (6)

  1. Rezen T, Rozman D, Kovacs T et al. (2022). Rezen et al. 2022 — The Role of Bile Acids in Carcinogenesis. Cellular and Molecular Life Sciences. doi:10.1007/s00018-022-04278-2
  2. Junwen Zhu, Jin Lyu, Ruochi Zhao et al. (2023). Gut macrobiotic and its metabolic pathways modulate cardiovascular disease. Frontiers in Microbiology. doi:10.3389/fmicb.2023.1272479
  3. Alexander C. Razavi, Kaitlin S. Potts, Tanika N. Kelly et al. (2019). Sex, gut microbiome, and cardiovascular disease risk. Biology of Sex Differences. doi:10.1186/s13293-019-0240-z
  4. ★Monisha Jaishankar, Tenzin Tseten, Naresh Anbalagan et al. (2014). Toxicity, Mechanism and Health Effects of Some Heavy Metals. Interdisciplinary Toxicology. doi:10.2478/intox-2014-0009
  5. Mohamed Raâfet Ben Khedher, Houda Bouhajja, Samia Haj Ahmed et al. (2017). Ben Khedher 2017 — Disturbed Fatty Acids Metabolism in Diabetic Erectile Dysfunction. Lipids in Health and Disease. doi:10.1186/s12944-017-0637-9
  6. Nan Wu, Ke Ning, Yanan Liu et al. (2025). Wu 2025 — Relationship between High-Fat Diet, Gut Microbiota, and Precocious Puberty: Mechanisms and Implications. Frontiers in Microbiology. doi:10.3389/fmicb.2025.1564902

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