miR-30c-5p Reduces Renal Ischemia-Reperfusion Involving Macrophage

Area of Science:

• Nephrology
• Immunology
• Molecular Biology

Background:

• Ischemia-reperfusion (I/R) injury is a significant cause of acute kidney injury and complications in kidney transplantation.
• MicroRNAs, specifically miR-30, have emerged as potential regulators of immune responses and inflammation in renal I/R.
• The precise role of miR-30c-5p in modulating renal I/R and its interaction with macrophage polarization requires further investigation.

Purpose of the Study:

• To investigate the therapeutic effects of miR-30c-5p on renal ischemia-reperfusion (I/R) injury.
• To elucidate the relationship between miR-30c-5p, renal I/R, and macrophage polarization (M1 vs. M2).

Main Methods:

• A renal I/R rat model was established, and animals were treated with miR-30c-5p agomir.
• Serum creatinine (Cr) and neutrophil gelatinase-associated lipocalin (NGAL) levels were measured.
• Renal tissue injury was assessed using hematoxylin and eosin staining.
• THP-1 cells were treated with miR-30c-5p agomir/antagomir, and macrophage polarization markers (CD86, iNOS, CD206) and cytokines (TNF-alpha, IL-4, IL-10) were analyzed via qPCR and Western blot.

Main Results:

• Administration of miR-30c-5p agomir significantly reduced serum Cr, serum NGAL, and overall renal I/R injury.
• In vivo and in vitro studies showed that miR-30c-5p agomir inhibited M1 macrophage markers (CD86, iNOS) and pro-inflammatory cytokines (TNF-alpha).
• Conversely, miR-30c-5p agomir promoted M2 macrophage markers (CD206) and anti-inflammatory cytokines (IL-4, IL-10), indicating a shift towards an anti-inflammatory phenotype.

Conclusions:

• MiR-30c-5p agomir demonstrates a protective effect against renal I/R injury.
• The mechanism involves the transformation of M1 macrophages to M2 macrophages, leading to modulation of inflammatory cytokine profiles.
• These findings suggest miR-30c-5p as a potential therapeutic target for mitigating renal I/R damage.