ABSTRACT
Ferroptosis is a new form of regulated cell death discovered in recent years, which is iron-dependent cell death characterized by peroxidation of polyunsaturated fatty acid phospholipids. Recent studies have shown that radiotherapy can induce ferroptosis in cancer cells via ionizing radiation. Targeting ferroptosis plays a synergistic role in tumor suppression with radiation, which not only further deepens the connotation of radiobiology, but also provides a new perspective for tumor radiosensitization. This review systematically summarizes the occurrence and defense of ferroptosis, focusing on the key role of ferroptosis in the radiobiological effects of tumor cells and the potential application of ferroptosis in radiosensitization.
ABSTRACT
Objective to measure the percentage of th22 cells and evaluate the levels of plasma interlukin-22(IL-22)in human peripheral blood, so as to determine their clinical significance in primary Sj?gren′s syndrome(pSS). Methods Patients with pSS were divided into three subgroups based on severity of labial gland involvement:mild,moderate and severe. Healthy people served as controls. the percentage of th22 cells and the lev-els of IL-22 in human peripheral blood from pSS patients and healthy controls were measured and compared. Results Compared to healthy con-trols,pSS patients had significantly higher percentage of th22 cells and higher plasma IL-22 levels(P < 0.05). Among pSS patients,the more seri-ous illness they had,the higher percentage of th22 cell and levels of IL-22 were observed. Severe patients had higher percentage of th22 cells and IL-22 levels than moderate patients(P < 0.05),and moderate patients had higher percentage of th22 cells and IL-22 levels than mild patients(P <0.05). Conclusion Increased peripheral IL-22-secreting th22 cells are detected in primary Sj?gren′s syndrome,which have a close association with disease severity. these data suggest that th22 and its released cytokine IL-22 may be considered as potential valuable biomarkers for severity of pSS,which may provide a novel therapeutic target for treatment.
ABSTRACT
BACKGROUND: In the tooth regeneration and dental tissue engineering study, finding suitable stem cells are the central issues.OBJECTIVE: To isolate and culture child exfoliated deciduous tooth pulp stromal cells, and compare difference in dentin sialophosphoproteln expression prior to and following mineralization.DESIGN, TIME AND SETTING: The cell observational experiment was performed at the Central Laboratory of Daqing Oil Field General Hospital from December 2006 to December 2007.PARTICIPANTS: Dental pulp were obtained from exfoliated deciduous molar tooth of eight children aged from eight to ten, four males, four females. The possibility of infectious diseases, endocrine disease, dental caries and periodontal disease was excluded.METHODS: Deciduous teeth pulp stromal cells were obtained by tissue block adhesion method, and then cultured in DMEM with 10% fetal bovine serum for 14 days. Following digestion and passage, cells were incubated in DMEM/F12 supplemented with 50 pmol/L laevo-ascorbic acid, 10 nmol/L vitamin D3. 10 mmol/L Na β-glycerophosphate and 10-8 mol/L dexamethasone for another 14 days. Cells cultured in complete DMEM served as controls.MAIN OUTCOME MEASURES: Cell morphology and growth rule were observed under a microscope. Difference in dentin sialophesphoproteln expression was determined prior to and following mineralization using immunocytochemical staining.RESULTS: Dental pulp stromal cells from human exfoliated deciduous tooth, adhered to the wall, were polygon-shaped and characterized by large cell size and a relatively large nucleus and plenty cytoplasm after mineralization for 14 days. Over 80% cells were positive for dentin sialophosphoprotein. Non-induced cells were spindle, and only 2% cells were positive for dentin sialophosphoprotein.CONCLUSION: Odontogenic inductive culture might improve odontoblastic differentiation. It seems that human exfoliatod deciduous tooth pulp represents an new reservoir of adult stem cells with odontogenic potential.