Role of Cytoglobin in Ferroptosis Regulation / 中国生物化学与分子生物学报

Ferroptosis is a recently reported iron-dependent cell death, which is induced by the broken of cellular redox homeostasis and characterized by high level of lipid peroxide. More and more studies have indicated the importance of ferroptosis during disease development and prevention. As a member of globin family, cytoglobin (CYGB), also known as stellate cell activating protein (STAP), can bind to oxygen for its transportation. Moreover, CYGB contains two cysteins within its amino acid sequence and could form the S-S bond when there has change of cellular redox which will result in downstream signaling alternation. Furthermore, CYGB has nitric oxygen dioxygenase activity to scavenge excessive nitric oxygen and prevent the production of ONOO

Effect of cytoglobin overexpression on extracellular matrix component synthesis in human tenon fibroblasts

BACKGROUND: Conjunctival filtering bleb scar formation is the main reason for the failure of glaucoma filtration surgery. Cytoglobin (Cygb) has been reported to play an important role in extracellular matrix (ECM) remodeling, fibrosis and tissue damage repairing. This study aimed to investigate the role of Cygb in anti-scarring during excessive conjunctival wound healing after glaucoma filtration surgery. METHODS: Cygb was overexpressed in human tenon fibroblasts (hTFs) by transfecting hTFs with lentiviral particles encoding pLenti6.2-FLAG-Cygb. Changes in the mRNA and protein levels of fibronectin, collagen I, collagen III, TGF-ß1, and HIF1α were determined by RT-PCR and western blotting respectively. RESULTS: After Cygb overexpression, hTFs displayed no significant changes in visual appearance and cell counts compared to controls. Whereas, Cygb overexpression significantly decreased the mRNA and protein expression levels of collagen I, collagen III and fibronectin compared with control (p < 0.01). There was also a statistically significant decrease in the mRNA and protein levels of TGF-ß1 and HIF-1α in hTFs with overexpressed Cygb compared with control group (p < 0.05). CONCLUSION: Our study provided evidence that overexpression of Cygb decreased the expression levels of fibronectin, collagen I, collagen III, TGF-ß1 and HIF-1α in hTFs. Therefore, therapies targeting Cygb expression in hTFs may pave a new way for clinicians to solve the problem of post-glaucoma surgery scarring.

Protective effect of cytoglobin under hypoxia:An update / 医学研究生学报

As the fourth member of the globin family, cytoglobin ( CYGB) is a hypoxia-induced gene, and its expression is upregulated under hypoxia.CYGB is widely distributed in the living body and has a variety of physiological functions, such as anti-oxi-dative stress, anti-fibrosis, and neuroprotection.It also plays a protective role in cardiovascular disease, cancer, and other hypoxia-re-lated diseases.This article presents an overview on the structure and distribution of CYGB, its physiological functions of anti-fibrosis, anti-cancer and muscle regeneration, and the regulation and the mechanism of its expression under hypoxia.

Expression of cytoglobin gene in hypoxic-ischemic brain damage of newborn rat / 国际儿科学杂志

Objective To investigate the expression and change of cytoglobin(Cygb)gene on hypoxicischemic brain damage(HIBD).Methods Fifty SD rats of 7days old were divided into four study groups and one control group.The brain tissues were taken at 4hours,12hours,24hours and 48hours after the onset of HIBD.Cygb mRNA was determined by the reverse transcription PCR.One-way method of GraphPad Prism was used for statistics.Results The fragment length of PCR products was identical with experimental design.The expression level of Cygb gene increased at 4h after ischemia,and peaked at 24h.48h after HIBD,the Cygb gene level began to decrease.Conclusion The expression of Cygb in brain tissue increased rapidly after HIBD of newborn rats,suggesting that Cygb may have important function in the protection process of HIBD.