Beyond its local metabolic roles, the liver communicates bidirectionally with virtually every other organ system through what are known as “liver axes.” These axes represent physiological networks where liver function influences — and is influenced by — other organs, linking metabolism, immunity, and homeostasis into one coherent system.

Introducing the Liver Axis: 

• Liver-Gut Axis: Involved in digestion, microbiota regulation and bowel function. ¹
• Liver-Brain Axis: Influencing cognition and memory, mood and fatigue. ²
• Liver-Kidney Axis: Involved in blood flow and electrolyte balance. ³
• Liver-Cardiovascular Axis: Critical in lipid regulation and vascular inflammation. ⁴
• Liver-Hormonal Axis: Modulates thyroid, adrenal, and sex hormone pathways. ⁵
• Liver-Musculoskeletal Axis: Regulates vitamin D activation, calcium balance, and IGF-1 production, all of which are crucial for bone density, muscle maintenance, and physical resilience. ⁶
• Liver–Skin, Hair & Nails Axis: Supports plasma protein synthesis and influences vitamin/micronutrient status essential to dermal and follicular health. ⁷
• Liver-Pancreas Axis: Insulin and glucagon, two pancreatic hormones, work with the liver to maintain glucose balance by storing extra glucose as glycogen and releasing it through glycogenolysis and gluconeogenesis when levels drop. ⁸
• Liver- Immune Axis: Modulates immunity and helps maintain systemic inflammatory homeostasis. ⁹
  
  

REFERENCES: 

¹ Albillos A, de Gottardi A, Rescigno M. The gut-liver axis in liver disease: Pathophysiological basis for therapy. J Hepatol. 2020;72(3):558-577. doi:10.1016/j.jhep.2019.10.003

² Sun T, Feng M, Manyande A, Xiang H, Xiong J, He Z. Regulation of mild cognitive impairment associated with liver disease by humoral factors derived from the gastrointestinal tract and MRI research progress: a literature review. Front Neurosci. 2023;17:1206417. Published 2023 Jun 16. doi:10.3389/fnins.2023.1206417

³ Bogdan RG, Boicean A, Anderco P, et al. From Liver to Kidney: The Overlooked Burden of Nonalcoholic Fatty Liver Disease in Chronic Kidney Disease. J Clin Med. 2025;14(7):2486. Published 2025 Apr 5. doi:10.3390/jcm14072486

⁴ Nakashima M, Nakamura K, Nishihara T, et al. Association between Cardiovascular Disease and Liver Disease, from a Clinically Pragmatic Perspective as a Cardiologist. Nutrients. 2023;15(3):748. Published 2023 Feb 1. doi:10.3390/nu15030748

⁵ Rhyu J, Yu R. Newly discovered endocrine functions of the liver. World J Hepatol. 2021;13(11):1611-1628. doi:10.4254/wjh.v13.i11.1611

⁶ Yang YJ, Kim DJ. An Overview of the Molecular Mechanisms Contributing to Musculoskeletal Disorders in Chronic Liver Disease: Osteoporosis, Sarcopenia, and Osteoporotic Sarcopenia. Int J Mol Sci. 2021;22(5):2604. Published 2021 Mar 5. doi:10.3390/ijms22052604

⁷ Bhandari A, Mahajan R. Skin Changes in Cirrhosis. J Clin Exp Hepatol. 2022;12(4):1215-1224. doi:10.1016/j.jceh.2021.12.013

⁸ Habegger KM. Cross Talk Between Insulin and Glucagon Receptor Signaling in the Hepatocyte. Diabetes. 2022;71(9):1842-1851. doi:10.2337/dbi22-0002

⁹ Robinson MW, Harmon C, O'Farrelly C. Liver immunology and its role in inflammation and homeostasis. Cell Mol Immunol. 2016;13(3):267-276. doi:10.1038/cmi.2016.3