Autophagy Function and Regulation in Kidney Disease.

Area of Science:

• Cell Biology
• Renal Physiology
• Molecular Medicine

Background:

• Autophagy is a fundamental cellular process for degrading and recycling damaged components, essential for maintaining kidney homeostasis.
• Basal autophagy functions as a critical quality control mechanism in the kidney.
• While generally protective, autophagy's role in renal injury can be complex and sometimes insufficient, particularly in dysregulated conditions.

Purpose of the Study:

• To review the current understanding of autophagy regulation in the kidney.
• To elucidate the role of autophagy in the pathogenesis of renal injury and disease.
• To summarize the impact of autophagy on various forms of cell death in renal pathophysiology.

Main Methods:

• Literature review focusing on autophagy mechanisms and renal injury.
• Analysis of studies on kidney-specific gene deletions (e.g., Atg genes) in mouse models of acute kidney injury (AKI).
• Examination of signaling pathways regulating autophagy, including mammalian target of rapamycin (mTOR)-dependent and -independent pathways.

Main Results:

• Kidney-specific deletion of autophagy-related (Atg) genes exacerbates acute kidney injury (AKI), supporting autophagy's pro-survival role.
• Autophagy is implicated in the progression of chronic kidney disease and subsequent fibrosis.
• Autophagy influences tubular cell death, including apoptosis and regulated necrosis, in the context of renal injury.

Conclusions:

• Autophagy plays a significant role in the pathophysiology of renal injury, influencing cellular adaptation, survival, and death.
• Understanding the intricate regulatory mechanisms of autophagy is key to developing novel therapeutic strategies for kidney diseases.
• Targeting autophagy pathways may offer promising avenues for treating various renal pathologies.