Regulation of Autophagy by the Cdk1/p53/p21 Feedback Loop in an Interstitial Cystitis/Bladder Pain Syndrome Cell Model: Implications for Inflammatory Response.

IF 1.8 3区 医学 Q3 OBSTETRICS & GYNECOLOGY
Kun Wang, Jian Shi, Zhen Chen, Yibo Zhuang, Dong Xue
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Abstract

Introduction and hypothesis: The Cdk1/p53/p21 feedback loop could play an important role in maintaining a consistently high urinary tract epithelial permeability. This study is aimed at elucidating whether this feedback loop is associated with the inadequate autophagic response and the heightened inflammatory response in interstitial cystitis/bladder pain syndrome (IC/BPS).

Methods: To construct the IC/BPS cell model, HTB4 cells were first treated with 1% H2O2 for 1 h, followed by a 24-h exposure to TNFα (10 ng/ml). The protein expression levels of LC3-I/II and Beclin 1 were assessed using Western blot analysis. Autophagosome formation was visualized using monodansylcadaverine (MDC) staining. The secretion levels of inflammatory cytokines, including IL-6, IL-8, and TNFα, were quantified using enzyme-linked immunosorbent assay. Additionally, malondialdehyde (MDA) levels and the activities of antioxidant enzymes (GSH and SOD2) were measured.

Results: Compared with normal urothelial HTB4 cells, the number of autophagosomes and the levels of LC3-I/II and Beclin 1 are significantly increased in IC/BPS cells. These cells also exhibit markedly higher levels of inflammatory markers (TNFα, IL-6, IL-8) and MDA, alongside notably reduced levels of the antioxidants GSH and SOD2. Compared with IC/BPS cells or IC/BPS cells co-transfected with p21 siRNA and Cdk1 control, the IC/BPS cells co-transfected with p21 siRNA and Cdk1 inhibitor exhibit a significant increase in terms of autophagosome numbers and the LC3-I/II level. Additionally, the levels of inflammatory factors are significantly decreased in the IC/BPS cells co-transfected with p21 siRNA and Cdk1 inhibitor.

Conclusion: In IC/BPS, the Cdk1/p53/p21 feedback loop could regulate the level of autophagy and inflammatory response. This discovery identifies promising new therapeutic targets for IC/BPS, which may pave the way for innovative clinical approaches to this complex disorder.

间质性膀胱炎/膀胱痛综合征细胞模型中Cdk1/p53/p21反馈回路对自噬的调节:对炎症反应的影响
介绍和假设:Cdk1/p53/p21反馈回路可能在维持尿路上皮持续高通透性中发挥重要作用。本研究旨在阐明这种反馈回路是否与间质性膀胱炎/膀胱痛综合征(IC/BPS)中自噬反应不足和炎症反应增强有关。方法:HTB4细胞先用1% H2O2处理1 h,再用TNFα (10 ng/ml)处理24 h,构建IC/BPS细胞模型。Western blot检测LC3-I/II和Beclin 1蛋白表达水平。自噬体形成用单胺尸胺(MDC)染色。采用酶联免疫吸附法测定炎性细胞因子IL-6、IL-8、tnf - α的分泌水平。此外,测定丙二醛(MDA)水平和抗氧化酶(GSH和SOD2)活性。结果:与正常尿路上皮HTB4细胞相比,IC/BPS细胞自噬体数量、LC3-I/II和Beclin 1水平均显著升高。这些细胞还表现出明显较高的炎症标志物(TNFα、IL-6、IL-8)和MDA水平,同时抗氧化剂GSH和SOD2水平显著降低。与IC/BPS细胞或共转染p21 siRNA和Cdk1对照的IC/BPS细胞相比,共转染p21 siRNA和Cdk1抑制剂的IC/BPS细胞在自噬体数量和LC3-I/II水平方面显著增加。此外,在共转染p21 siRNA和Cdk1抑制剂的IC/BPS细胞中,炎症因子水平显著降低。结论:在IC/BPS中,Cdk1/p53/p21反馈回路可调节自噬水平和炎症反应。这一发现确定了IC/BPS有希望的新治疗靶点,这可能为这种复杂疾病的创新临床方法铺平道路。
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来源期刊
CiteScore
3.80
自引率
22.20%
发文量
406
审稿时长
3-6 weeks
期刊介绍: The International Urogynecology Journal is the official journal of the International Urogynecological Association (IUGA).The International Urogynecology Journal has evolved in response to a perceived need amongst the clinicians, scientists, and researchers active in the field of urogynecology and pelvic floor disorders. Gynecologists, urologists, physiotherapists, nurses and basic scientists require regular means of communication within this field of pelvic floor dysfunction to express new ideas and research, and to review clinical practice in the diagnosis and treatment of women with disorders of the pelvic floor. This Journal has adopted the peer review process for all original contributions and will maintain high standards with regard to the research published therein. The clinical approach to urogynecology and pelvic floor disorders will be emphasized with each issue containing clinically relevant material that will be immediately applicable for clinical medicine. This publication covers all aspects of the field in an interdisciplinary fashion
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