SQSTM1/p62: A Key Player in Autophagy and Inflammation

The protein SQSTM1, also known as p62, is increasingly recognized for its multifunctional role in cellular processes such as autophagy, inflammation, and proteostasis. Understanding its mechanisms is vital for metabolic health, particularly in conditions like sepsis, where inflammation and metabolic dysregulation are prominent. This review highlights how SQSTM1 acts as a signaling adaptor that bridges these processes, influencing immune responses and tissue injury across various organs including the liver, kidney, and heart. Recent findings indicate that SQSTM1 modulates selective autophagy and immune signaling pathways, particularly during sepsis. It transitions from a protective role within cells to a pathological role as a damage-associated molecular pattern (DAMP) in the extracellular space. This shift is crucial as it may exacerbate inflammation and metabolic dysfunction in the later stages of sepsis. For instance, extracellular SQSTM1 has been linked to increased production of pro-inflammatory cytokines, which can further impair metabolic health by promoting insulin resistance and altering lipid metabolism. For individuals concerned about metabolic health, understanding the role of SQSTM1 provides actionable insights. By focusing on reducing inflammation through dietary interventions, such as adopting a low-carb or ketogenic diet, individuals may help modulate SQSTM1 levels and improve their metabolic profile. Additionally, engaging in regular physical activity can enhance autophagy and reduce inflammation, potentially mitigating the adverse effects associated with elevated SQSTM1 levels. In relation to specific biomarkers, SQSTM1's involvement in inflammation connects to markers such as hsCRP (high-sensitivity C-reactive protein) and uric acid, both of which are critical in assessing metabolic health. Elevated hsCRP levels indicate systemic inflammation, while high uric acid levels can be associated with metabolic syndrome. Monitoring these biomarkers can provide insights into how well the body is managing inflammation and metabolic processes. In conclusion, SQSTM1/p62 serves as a pivotal player in the intersection of autophagy and inflammation, particularly in the context of sepsis. Its dual role as both a protective mediator and a pathological DAMP underscores the importance of maintaining immune balance for metabolic health. By understanding and potentially targeting SQSTM1 through lifestyle changes and therapeutic interventions, individuals can take proactive steps toward enhancing their metabolic health.