Biblioteca Virtual en Salud

Objective:

To evaluate the role of cold-inducible RNA-binding protein (CIRP) in acute renal injury in a mouse model of myocardial ischemia-reperfusion (I/R) and the relationship with nuclear factor kappa B (NF-κB) signaling pathway.

Methods:

Twenty-four SPF-grade healthy male C57BL/6 mice, aged 6-8 weeks, with body mass index of 24-28 g, were divided into 3 groups ( n=8 each) using a random number table

method:

sham operation group (Sham group), myocardial I/R group (I/R group) and myocardial I/R + CIRP-derived peptide C23 group (I/R+ C23 group). The model of myocardial I/R was developed by ligation of the left anterior descending coronary artery for 30 min followed by 120-min reperfusion in anesthetized animals. CIRP-derived peptide C23 8 mg/kg was intraperitoneally injected before myocardial ischemia and reperfusion in I/R+ C23 group, while Sham group was only threaded without ligation. Blood samples were collected from the right internal carotid artery at 120 min of reperfusion for determination of the serum creatine kinase isoenzymes (CK-MB), lactic dehydrogenase (LDH), creatinine (Cr) and blood urea nitrogen (BUN) concentrations. Renal tissues were obtained for examination of the pathological changes, and the tubular injury score was assessed. The expression of NF-κB, phosphorylated NF-κB (p-NF-κB), Nod-like receptor protein 3 (NLRP3), interleukin-1beta (IL-1β) and IL-18 in renal tissues was detected by Western blot. The expression of Toll-like receptor 4 (TLR4), NLRP3, IL-1β, TNF-α and IL-6 mRNA was determined by real-time polymerase chain reaction.

Results:

Compared with Sham group, the levels of serum CK-MB, LDH, Cr and BUN and renal tubule injury score were significantly increased, the expression of p-NF-κB, NLRP3, IL-1β and IL-18 was up-regulated, the expression of TLR4, NLRP3, IL-1β, TNF-α and IL-6 mRNA was up-regulated ( P<0.05), and the pathological injury to renal tissues was aggravated in I/R group. Compared with I/R group, the serum CK-MB, LDH, Cr, BUN and renal tubular injury score were significantly decreased, and the expression of p-NF-κB, NLRP3, IL-1β and and IL-18 was down-regulated, the expression of TLR4, NLRP3, IL-1β, TNF-α and IL-6 mRNA was down-regulated ( P<0.05), and the pathological injury to renal tissues was alleviated in I/R+ C23 group.

Conclusions:

CIRP is involved in the process of acute renal injury in a mouse model of myocardial I/R, which is associated with activation of NF-κB signaling pathway and promotion of inflammatory responses.