The insulin receptor and the kidney

Area of Science:

• Nephrology
• Endocrinology
• Molecular Biology

Background:

• The insulin receptor (INSR) plays a critical role in various renal cell types.
• Insulin and insulin-like growth factor hormones bind to the INSR, influencing cellular functions.
• Understanding INSR's role in the kidney is crucial for metabolic and renal health.

Purpose of the Study:

• To review recent advancements in understanding the insulin receptor and insulin signaling pathways in the kidney.
• To highlight the INSR's function in glomerular and tubular renal compartments.
• To connect INSR dysfunction to renal complications.

Main Methods:

• Literature review of recent studies on insulin receptor function in the kidney.
• Analysis of research on podocyte and tubular cell biology.
• Synthesis of findings related to insulin signaling and renal pathologies.

Main Results:

• The insulin receptor is essential for podocyte function, and its loss mimics features of diabetic nephropathy.
• Mammalian target of rapamycin (mTOR) in podocytes, involved in nutrient sensing and protein synthesis, may be regulated by the insulin receptor.
• The insulin receptor regulates sodium excretion and blood pressure in the distal renal tubules.

Conclusions:

• The insulin receptor is indispensable for maintaining glomerular and tubular renal function.
• Diminished insulin signaling, as seen in insulin resistance, contributes to albuminuric glomerular disease and hypertension.
• Targeting insulin receptor pathways may offer therapeutic strategies for renal complications.