Regulation of Autophagy by the Cdk1/p53/p21 Feedback Loop in an Interstitial Cystitis/Bladder Pain Syndrome Cell Model: Implications for Inflammatory Response.
Kun Wang, Jian Shi, Zhen Chen, Yibo Zhuang, Dong Xue
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引用次数: 0
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.
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