Objective To explore the expressions and significance of miRNA - 101,enhancer of ZESTE homo-log 2(EZH2)and transforming growth factor(TGF)- β1 in the kidneys with complete uniateral ureteral obstruction (CUUO). Methods Thirty male SD rats,(6 ± 1)weeks old,weighted(150 ± 10)g,were divided into sham group, 7 - day group with CUUO and 14 - day group with CUUO by using random number table method,10 rats in each group. The obstructed kidney samples were collected in 7 and 14 days,respectively,for detecting the expression of miRNA -101 by real time - polymerase chain reaction(RT - PCR)and TGF - β1 and EZH2 protein by Western blot,immuno-histochemistry and hematoxylin - eosin staining. Their correlated expressions were analyzed. Results RT - PCR results showed that the expressions of miRNA - 101 in sham group and 7 - day group with CUUO were(12. 69 ± 1. 60)times and(3. 74 ± 1. 24)times which were higher than those of 14 - day group with CUUO,respectively,there was a signifi-cant difference among these 3 groups(P ﹤ 0. 05). The expressions of TGF - β1 and EZH2 proteins were 1. 14 ± 0. 12, 1. 04 ± 0. 14,0. 76 ± 0. 18 and 1. 04 ± 0. 04,0. 89 ± 0. 03,0. 73 ± 0. 02 in 14 - day group with CUUO,7 - day group with CUUO and sham group,respectively. There was a negative correlation between miRNA - 101 with EZH2( r =- 0. 92,P ﹤ 0. 05),and negative correlation with TGF - β1(r = - 0. 63,P ﹤ 0. 05),and positive correlation between EZH2 and TGF - β1(r = 0. 67,P ﹤ 0. 05);the expressions of miRNA - 101,EZH2 and TGF - β1 were associated with each other in obstruction renal in different time periods. Conclusions With the extension of obstruction time, miRNA - 101 expression decreased,EZH2 and TGF - β1 expression increased,evidently,which indicates that the de-velopment of renal interstitial fibrosis may be affected through regulating EZH2 expression of renal obstruction through miRNA - 101 in the young rats.

Objective To evaluate the efficacy and safety of external ureteral catheterization of tubeless mini-percutaneous nephrolithotomy(mini-PCNL)in the treatment of single urinary calculus.Methods Clinical data of 21 patients with single renal or upper ureteral calculi treated with tubeless mini-PCNL from June 2021 to December 2022 were retrospectively analyzed.Among them,there were16 cases of kidney stones and5 cases of upper ureteral stones.The length of stones was1.5-3.5 cm(mean,2.07±0.56 cm).The ureteral catheter was indwelled by cystoscope and retained for catheterization,and the ureteral catheter and catheterization were fixed.If there were no residual stones after mini-PCNL,the Peel-away sheath was removed and the incision was sutured.Results All the operations were successfully completed,and the catheterization and ureteral catheter were removed 3-5 days after operation.There were slight gross hematuria in all the cases,fever in 3 cases,perirenal hematoma in 4 cases,and no urinary extravasation postoperatively.One month after discharge,B-ultrasonography or CT scanning showed no lithiasis,urinary cyst or hematoma formation around the kidney.Conclusion In selected cases(single and non-staghorn stones,without intraoperative stone residue or ureteral stenosis),external ureteral catheterization of tubeless mini-PCNL is safe and effective.