[Urine cardiac specific microRNA-1 level in patients with ST segment elevation acute myocardial infarction].

Objective: To observe the change of urine level of cardiac specific microRNA-1 (miR-1) in patients with ST segment elevation acute myocardial infarction (STEAMI) and investigate its potential applications.

Methods: Urine samples were collected from 20 STEAMI patients within 12 hours after STEAMI and from 20 healthy volunteers as control. Urine miR-1 concentrations were measured with real-time quantity reverse transcription-polymerase chain reaction (qRT-PCR), at the same time serum cardiac troponin I (cTnI) and MB isoenzyme of creatine kinase (CK-MB) concentrations were measured.

Results: Serum level of cTnI, CK-MB and urine level of miR-1 in STEAMI patients were obviously higher than those in healthy control group [cTnI in blood: 19.27±7.53 μg/L vs. 0.02±0.01 μg/L, CK-MB in blood: 93.82±12.30 μg/L vs. 0.86±0.63 μg/L, miR-1 in urine (Ct value): 45.50±4.21 vs. 52.63±4.41, P<0.05 or P<0.01]. The urine miR-1 level in patients with STEAMI had a strong correlation with serum CK-MB or cTnI when CK-MB < 300 μg/L and cTnI <50 μg/L (Ct value of urine miR-1 with blood CK-MB: r=-0.81, P<0.01; Ct value of urine miR-1 with blood cTnI: r=-0.63, P<0.05).

Conclusions: The results suggest that urine miR-1 could be a novel sensitive biomarker the early diagnosis of SETAMI.