Renal tubule injury: a driving force toward chronic kidney disease

Area of Science:

• Nephrology
• Cell Biology
• Immunology

Background:

• Renal tubules are vital kidney components susceptible to various injuries.
• Traditionally viewed as passive victims of kidney injury.
• This review reframes renal tubules as active drivers of kidney disease.

Purpose of the Study:

• To challenge the traditional view of renal tubules in kidney injury.
• To highlight the active role of tubular epithelial cells in disease progression.
• To emphasize the need for understanding tubular injury mechanisms for therapeutic development.

Main Methods:

• Review of existing literature on renal tubule injury and kidney disease.
• Analysis of cellular and molecular mechanisms involved in tubular response to injury.
• Synthesis of evidence on the role of tubular cells in inflammation and fibrosis.

Main Results:

• Tubular epithelial cells transform into inflammatory and fibrogenic cells post-injury.
• Bioactive molecules produced by injured tubules promote interstitial inflammation and fibrosis.
• Innate immune receptors on tubules exacerbate immune responses.
• Necroinflammation, a loop of cell death and inflammation, worsens kidney injury.
• Emerging mechanisms like partial epithelial-mesenchymal transition, cell-cycle arrest, and metabolic dysfunction contribute to progressive injury.

Conclusions:

• Renal tubules are active participants, not just victims, in kidney disease.
• Understanding tubular injury mechanisms is crucial for halting chronic kidney disease progression.
• Targeting tubular cell-driven inflammation and fibrosis offers therapeutic potential.