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Tumors continue to be a major challenge in human survival that we have yet to overcome. Despite the variety of treatment options available, we have not yet found an effective method. As more and more research is conducted, attention has been turned to a new field for tumor treatment—the tumor microenvironment (TME). This is a dynamic and complex environment consisting of various matrix cells surrounding cancer cells, including surrounding immune cells, blood vessels, extracellular matrix, fibroblasts, bone marrow-derived inflammatory cells, signaling molecules, and some specific cell types. Firstly, endothelial cells play a key role in tumor development and the immune system’s protection of tumor cells. Secondly, immune cells, such as macrophages, Treg cells, Th17 cells, are widely involved in various immune responses and activities in the human body, such as inflammation responses promoting survival carefully orchestrated by the tumor. Even though many studies have extensively researched the TME and found many research schemes, so far, no key effective method has been found to treat tumors by affecting the TME. The TME is a key interaction area between the host immune system and the tumor. Cells within the TME influence each other and interact with cancer cells to affect cancer cell invasion, tumor growth, and metastasis. This is a new direction for cancer treatment. In the complex environment of the TME, post-translational modifications (PTMs) of proteins have been proven to play an important role in the TME. PTMs are dynamic, strictly regulated changes to proteins that control their function by regulating their structure, spatial location, and interaction. Among PTMs, a reversible post-translational modification called SUMOylation is a common regulatory mechanism in cellular processes. It is a post-translational modification that targets lysine residues with a small ubiquitin-like modifier (SUMO) in a reversible post-translational modification manner. SUMOylation is widely involved in carcinogenesis, DNA damage response, cancer cell proliferation, metastasis, and apoptosis, playing a pivotal role in the TME, such as DNA damage repair, tumor metastasis, and also participates in immune cell differentiation, activation, and inhibition of immune cells. On the other hand, SUMO or sentrin-specific protease (SENP) inhibitors can interfere with the SUMOylation process, thereby affecting many biological processes, including immune response, carcinogenesis, cell cycle progression, and cell apoptosis, etc. In summary, this review aims to introduce the dynamic modification of protein SUMOylation on various immune cells and the application of various inhibitors, thereby exploring its role in the TME. This is a challenging but hopeful field, and we look forward to future research that can bring more breakthroughs. In conclusion, the TME is a complex and dynamic environment that plays a crucial role in the development and progression of tumors. Understanding the intricate interactions within the TME and the role of PTMs, particularly SUMOylation, could provide valuable insights into the mechanisms of tumor development and potentially lead to the development of novel therapeutic strategies. The study of SUMOylation and its effects on various immune cells in the TME is an exciting and promising area of research that could significantly advance our understanding of tumor biology and potentially lead to the development of more effective treatments for cancer. This is a challenging but hopeful field, and we look forward to future research that can bring more breakthroughs.
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OBJECTIVE：To compare the eff icacy and safety of rivaroxaban versus enoxaparin in the treatment of malignant tumor complicated with venous thromboembolism （VTE），and to provide evidence-based reference to the clinic. METHODS ： Retrieved from PubMed ，Embase，Cochrane Library ，Clinical Trials ，CNKI，CBM and VIP ，clinical trials or observational studies about rivaroxaban versus enoxaparin were collected during the inception to Apr. 2020. After literature screening and data extraction ， the quality of included literatures were evaluated by Newcastle Ottawa scale ；Stata 15.0 software was used to conduct Meta-analysis，sensitivity analysis and publication bias analysis. RESULTS ：A total of 5 observational clinical cohort studies were retrieved，including 4 retrospective cohort studies and one prospective cohort study. Totally 997 patients were included ，among which 625 patients received enoxaparin and 372 patients received rivaroxaban. Results of Meta-analysis showed that there was no statistical significance in recurrence rate of VTE at 3 months follow-up [RR ＝0.91，95％CI（0.50，1.66），P＝0.760] and 6 months follow-up [RR ＝0.53，95％CI（0.24，1.15），P＝0.106] as well as the incidence of massive hemorrhage at 3 months follow-up [RR ＝ 1.22 ，95％CI（0.66，2.25），P＝0.530] and 6 months follow-up [RR ＝1.30，95％CI（0.73，2.33），P＝0.368]. The results of sensitivity analysis showed that the results of above Meta-analysis were stable ；the results of publication bias analysis showed that there was less possibility of publication bias in this study. CONCLUSIONS ：Rivaroxaban is as effective and safe as enoxaparin in the treatment of malignant tumor with VTE.
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OBJECTIVE: To establish an HPLC method for simultaneous determination of vitamin B2 and folic acid in Multivitamin with Multimineral Tablets. METHODS: The samples were extracted with 0.5% (V/V) ammonia solution. An Alltima C18 column (4.6 mm × 250 mm, 5 μm) was used for the separation with 50 mmol · L-1 ammonium dihydrogen phosphate (adjusted pH to 3.0 with H3PO4) and acetonitrile (85-15) as the mobile phase at the flow rate of 0.5 mL · min-1. The detection wavelength was 282 nm. RESULTS: The method showed good linearity for vitamin B2 and folic acid with both correlation coefficients (r) greater than 0.9999 in the ranges of 11.52-34.56 and 2.952-8.856 mg · L-1, respectively; the specificity study showed satisfactory resolutions between vitamin B2, folic acid, other ingredients and forced degradation products; the precisions were satisfactory with both relative standard deviations (RSD) lower than 2.0%; the spiked recoveriesy at three levels ranged from 97.95% to 102.3% for both compounds; the stability at ambient temperature was acceptable within 8 h for both compounds in combined standard solutions and analytical solutions. Method comparison indicated coincident results between this method and the USP method. CONCLUSION: This method is an accurate, fast and simple method for the simultaneous determination of vitamin B2 and folic acid in Multivitamin with Multimineral Tablets. Copyright 2012 by the Chinese Pharmaceutical Association.
