Latar Belakang: Penyakit ginjal diabetik (PGD) merupakan komplikasi mikrovaskular yang paling sering terjadi pada diabetes melitus. Podositopati merupakan kunci utama dari kerusakan glomerular pada PGD. miRNA-21 merupakan regulator epigenetik yang mempunyai peran dalam kerusakan podosit pada PGD, namun hasil dari penelitian yang sudah ada sebelumnya masih menyisakan kontroversi tentang peran miRNA-21 pada patogenesis PGD. Tujuan: Mengetahui korelasi antara kadar miRNA-21 dengan kadar nefrin urin, podosin urin, dan rasio albumin kreatinin urin pada pasien PGD. Metode: Studi potong lintang terhadap 42  pasien PGD di RSUPN Cipto Mangunkusumo Jakarta selama periode April sampai Juli 2023. Uji korelasi dilakukan untuk menilai hubungan miRNA-21 dengan nefrin, podosin, dan rasio albumin kreatinin urin. Regresi linier dilakukan untuk menilai variabel perancu terhadap hubungan tersebut. Hasil: Didapatkan hasil rerata ekspresi relatif miRNA-21 0,069 (0,024) , median nefrin 35,5 (15,75 – 51,25)ng/ml, median podosin 0,501 (0,442– 0,545) ng/mL, dan rasio albumin kreatinin urin 150 (94,56 – 335,75) ng/ml.Ditemukan korelasi antara miRNA-21 dengan nefrin (r = 0,598; p = <0,0001). Ditemukan korelasi antara miRNA-21 dengan rasio albumin kreatinin urin (r = 0,604; p = <0,0001). Tidak didapatkan korelasi antara miRNA-21 dengan podosin. Simpulan: Terdapat korelasi positif antara miRNA-21 dengan nefrin dan rasio albumin kreatinin urin namun tidak didapatkan korelasi yang bermakna antara miRNA-21 dengan podosin urin.

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Diabetic kidney disease (DKD) is the most common microvascular complication in diabetes mellitus. Podocytopathy is a key component of glomerular damage in DKD. miRNA-21 is an epigenetic regulator that plays a role in podocyte damage in DKD, however, the results of previous studies have not resolved the controversy about the role of miRNA-21 in the pathogenesis of DKD. Objective: The aim is to investigate the correlation between miRNA-21 levels and the urinary nephrin, urinary podosin, and urinary albumin-creatinine ratio (uACR) in patients with DKD.  Methods: A cross-sectional study of 42 patients with DKD was conducted at Cipto Mangunkusumo Hospital Jakarta from April to June 2023. A correlation test was performed to assess the association of miRNA-21 with the nephrin, podosin, and uACR. A linear regression test was performed to assess the confounding variables in these relationships. Results: The mean relative expression of miRNA-21 was 0.069 (0.024), the median nephrin was 35.5 (15.75 - 51.25) ng/ml, the median podocin was 0.516 (0.047 - 0.620) ng/ml, and the uACR was 150 (94.56 - 335.75) ng/ml. There was a correlation between miRNA-21 and nephrin (r = 0.598; p = <0.0001). There was a correlation between miRNA-21 and the uACR (r = 0.604; p = <0.0001). No correlation was found between miRNA-21 and podocin. Conclusions: There was a positive correlation between miRNA-21 and nephrin and urinary albumin-creatinine ratio, but no significant correlation between miRNA-21 and urinary podocin.