Blocking Periostin Prevented Development of Inflammation in Rhabdomyolysis-Induced Acute Kidney Injury Mice Model.

Area of Science:

• Nephrology
• Molecular Biology
• Pathology

Background:

• Rhabdomyolysis causes acute kidney injury (AKI) by releasing muscle contents into circulation.
• The nuclear factor kappa beta (NF-kB) pathway is implicated in AKI pathogenesis.
• Periostin (POSTN), an extracellular matrix protein, modulates inflammation via NF-kB, but its role in rhabdomyolysis-induced AKI is unclear.

Purpose of the Study:

• To investigate the role of POSTN in a mouse model of rhabdomyolysis-induced AKI.
• To determine if POSTN influences renal inflammation and injury progression.

Main Methods:

• Induced rhabdomyolysis-AKI in C57BL/6J wildtype (WT) and periostin-null mice using glycerol injection.
• Assessed POSTN expression levels at 72 hours post-injection.
• Evaluated kidney injury and inflammation markers (MCP-1, TNF-a, IL-6) in WT and POSTN-null mice.
• Conducted in vitro experiments using NIH-3T3 fibroblast cells with hemin administration.

Main Results:

• Periostin expression significantly increased, peaking at 72 hours after glycerol-induced rhabdomyolysis.
• POSTN-null mice exhibited reduced expression of inflammation markers (MCP-1, TNF-a, IL-6) and lower tubular injury scores compared to WT mice.
• In vitro studies examined POSTN's influence on the NF-kB pathway.

Conclusions:

• Periostin is highly expressed in the kidney during rhabdomyolysis-induced AKI.
• POSTN acts as a positive regulator of AKI, promoting renal inflammation and injury.
• Targeting POSTN presents a potential therapeutic strategy for preventing acute renal failure.