Effect of histone methyltransferase SMYD2 on macrophage-myofibro-blast transition-promoted renal fibrosis in diabetic kidney disease
10.3969/j.issn.1000-4718.2025.02.004
- VernacularTitle:组蛋白甲基转移酶SMYD2对巨噬细胞-肌成纤维细胞转化促进糖尿病肾病肾纤维化的影响
- Author:
Yuan YANG
1
;
Rui PENG
;
Zeying LIU
;
Xue ZOU
;
Xia LI
;
Huixiong YUAN
;
Hehua LONG
;
Teng WANG
;
Mingjie CEN
;
Bing GUO
;
Liying ZHU
;
Lirong LIU
Author Information
1. 贵州医科大学附属医院临床检验中心,贵州 贵阳 550004;贵州医科大学医学检验学院,贵州 贵阳 550004
- Publication Type:Journal Article
- Keywords:
methyltransferases;
SMYD2 protein;
diabetic kidney disease;
renal fibrosis;
macrophages;
myo-fibroblasts
- From:
Chinese Journal of Pathophysiology
2025;41(2):239-249
- CountryChina
- Language:Chinese
-
Abstract:
AIM:This study aims to investigate the role of histone methyltransferase SET and MYND domain containing 2(SMYD2)in facilitating renal fibrosis through the macrophage-myofibroblast transition in diabetic kidney dis-ease(DKD).METHODS:(1)C57BL/6J mice were intraperitoneally administered 55 mg/kg of streptozotocin to induce diabetes mellitus(DM).The experimental groups were categorized as follows:normal control,DM(20 weeks),DM(28 weeks),and DM(36 weeks).Blood glucose(BG),serum creatinine(SCr)and blood urea nitrogen(BUN)levels were determined using a biochemical analyzer.Hematoxylin-eosin(HE)staining and Masson staining were performed to assess morphological and fibrotic changes in renal tissues.Western blot analysis was used to measure the protein levels of SMYD2,histone H3 lysine 4 trimethylation(H3K4me3),arginase-1,matrix metalloproteinase 9(MMP9),collagen type Ⅰ(Col Ⅰ)and α-smooth muscle actin(α-SMA).Immunofluorescence staining was conducted to examine the localization and expression of F4/80,α-SMA,SMYD2,CD86,CD206 and CD163.(2)Mouse monocyte/macrophage RAW264.7 cells were cultured in vitro and assigned to groups as follows:normal glucose(NG)+negative control siRNA(siNC),high glucose(HG)+siNC,NG+SMYD2 siRNA(siSMYD2),and HG+siSMYD2.Western blot analysis was used to assess the expression of relevant proteins.RESULTS:(1)Compared with normal control group,the levels of BG,SCr and BUN were significantly elevated in DM(28 weeks)and DM(36 weeks)groups(P＜0.05).Renal tissue exhibited tubular atro-phy,dilation,and collagen fiber deposition.The levels of H3K4me3,arginase-1,MMP9,Col Ⅰ and α-SMA proteins were up-regulated(P＜0.05).The CD86,CD206,CD163 and F4/80 were primarily localized in the interstitial macrophages of the renal tubules,α-SMA was predominantly detected in the renal interstitium,and SMYD2 was mainly expressed in renal tubular epithelial cells and the renal interstitium.(2)Compared with NG+siNC group,the protein levels of SMYD2,H3K4me3,arginase-1,CD163,Col Ⅰ,α-SMA,transforming growth factor-β1(TGF-β1)and p-Smad3 in the cells of HG+siNC group were significantly increased(P＜0.05).Knockdown of SMYD2 resulted in a reduction of these indicators(P＜0.05).CONCLUSION:The SMYD2 protein appears to facilitate renal fibrosis in DKD by promoting the macrophage-myofibroblast transition,potentially through the modulation of TGF-β1/Smad3 signaling pathway.
