IL-6-Mediated Liver Regeneration: Exploring Key Signaling Pathways and Cellular Mechanisms

The liver is a vital organ responsible for a variety of essential functions in the human body, and the growing prevalence of liver damage and disease highlights the need to understand the liver's inherent regenerative capacity. Research into liver regeneration has shown that, among the numerous cytokines involved, interleukin-6 (IL-6) plays a critical and irreplaceable role. Without IL-6, the liver cannot effectively regenerate, underscoring its significance. This review examines IL-6 in detail, including its interaction with its receptor and its involvement in three distinct signaling modes: classical, trans-signaling, and cluster signaling. Additionally, it explores two key pathways activated by IL-6 that drive liver regeneration: the JAK/STAT and Ras/MAPK pathways, both of which are crucial for promoting hepatocyte proliferation and tissue repair. Understanding the precise mechanisms through which IL-6 regulates these signaling pathways, as well as its role in liver regeneration under varying degrees of injury, offers valuable insights that have broad implications for treating liver diseases and improving human health.