中国实验动物学报2025，Vol.33Issue(6)：823-835,13.DOI:10.3969/j.issn.1005-4847.2025.06.005
D-半乳糖诱导的衰老大鼠肾S100A8/9及介导的NLRP3/Caspase-1/IL-1β通路的变化
Changes in S100A8/9 and NLRP3/Caspase-1/interleukin-1β pathway in kidney-aging rats induced by D-galactose
摘要
Abstract
Objective To investigate changes in the pro-inflammatory mediator S100A8/9 and NLRP3/Caspase-1/IL-1β pathway in a rat kidney-aging model induced by D-galactose.Methods Twelve SD rats were divided into control and D-galactose groups,and injected subcutaneously in the back of the neck with D-galactose(150 mg/kg)to establish a rat model of kidney aging.Kidney samples were collected under anesthesia after 8 weeks.Kidneys were stained for senescence-associated beta-galactosidase(SA-β-Gal),mRNA expression levels of the aging-related genes p21,p16,and p53 were detected by quantitative reverse transcription-polymerase chain reaction(qRT-PCR),and histopathological changes were observed by hematoxylin-eosin(HE)and Masson staining.Serum urea nitrogen and creatinine,and catalase(CAT),glutathione peroxidase(GSH-PX),superoxide dismutase(SOD),and malondialdehyde(MDA)levels in the kidney tissues were detected.Reactive oxygen species(ROS)were detected by dihydroethdium staining and protein expression levels of collagen Ⅲ,α-smooth muscle actin(α-SMA),Protein expression of S100A8/9 was detected by immunofluorescence,and transforming growth factor(TGF)-β1 levels in kidney tissues and key factors in the NLRP3/Caspase-1/IL-1β inflammatory pathway were detected by Western Blot.A renal senescence model using HK-2 cells was constructed using H2O2 in vitro,and expression levels of the senescence proteins p21 and p16 and mRNA expression levels of the inflammatory factors IL-18 and tumor necrosis factor-α(TNF-α)were detected.Cell senescence was observed by SA-β-Gal staining.The effects of the S100A8/9 inhibitor paquinimod on expression levels of S100A8/9 and NLRP3/Caspase-1/IL-1β pathway-related proteins in the aging model were also detected.Results mRNA levels of the aging genes p21,p16,and p53 in kidney tissues were significantly increased in rats in the D-galactose group compared with the control group(P＜0.01),and SA-β-Gal staining showed a significant increase in senescent cells(P＜0.01).Serum blood urea nitrogen and creatinine levels increased(P＜0.05),CAT,GSH-PX,and SOD activities decreased(P＜0.01),while MDA activity increased in the D-galactose group(P＜0.01).Collagen Ⅲ,α-SMA,and TGFβ1 expression and the ROS content in tissues increased(P＜0.05).Glomeruli were atrophied or absent in the D-galactose group,the lumens of the renal sacs and renal tubules were enlarged,the nuclei were deeply stained and constricted,and numerous collagen fibers were deposited.Levels of S100A8 and S100A9 protein(P＜0.01),as well as NLRP3,Caspase-1,and IL-1β increased(P＜0.05).Paquinimod alleviated HK-2 cell senescence and decreased expression levels of the senescence proteins p21 and p16,and mRNA levels of the inflammatory factors IL-18 and TNF-α(P＜0.05,P＜0.01).The number of senile cells was also decreased,shown by SA-β-Gal staining(P＜0.01).Paquinimod also inhibited the protein expression of S100A8 and S100A9(P＜0.01)and NLRP3,Caspase-1,and IL-1β(P＜0.05 or P＜0.01).Conclusions S100A8/9 participates in the chronic inflammatory response by activating the NLRP3/Caspase-1/IL-1β pathway,thereby promoting D-galactose-induced renal aging.关键词
肾衰老/S100钙结合蛋白A8/9/NLRP3/Caspase-1/IL-1β通路/慢性炎症Key words
kidney senescence/S100A8/9/NLRP3/Caspase-1/IL-1β pathway/chronic inflammation分类
生物科学引用本文复制引用
冯丹丹,周荧,庞子瑶,蔡月琴,陈楚,张建友,王德军..D-半乳糖诱导的衰老大鼠肾S100A8/9及介导的NLRP3/Caspase-1/IL-1β通路的变化[J].中国实验动物学报,2025,33(6):823-835,13.基金项目
浙江省自然科学基金项目(LTGY24H290004),浙江省药物安全性评价与研究重点实验室开放项目(ZJDSE202202).Funded by Zhejiang Provincial Natural Science Foundation of China(LTGY24H290004),Open Project of Key Laboratory of Drug Safety Evaluation and Research of Zhejiang Province(ZJDSE202202). （LTGY24H290004）
