Tumor hypoxia is the Achilles heel of oxygen-dependent photodynamic therapy (PDT), and tremendous challenges are confronted to reverse the tumor hypoxia. In this work, an oxidative phosphorylation inhibitor of atovaquone (ATO) and a photosensitizer of chlorine e6 (Ce6)-based self-delivery nanomedicine (designated as ACSN) were prepared via π–π stacking and hydrophobic interaction for O2-economized PDT against hypoxic tumors. Specifically, carrier-free ACSN exhibited an extremely high drug loading rate and avoided the excipient-induced systemic toxicity. Moreover, ACSN not only dramatically improved the solubility and stability of ATO and Ce6 but also enhanced the cellular internalization and intratumoral permeability. Abundant investigations confirmed that ACSN effectively suppressed the oxygen consumption to reverse the tumor hypoxia by inhibiting mitochondrial respiration. Benefiting from the synergistic mechanism, an enhanced PDT effect of ACSN was observed on the inhibition of tumor growth. This self-delivery system for oxygen-economized PDT might be a potential appealing clinical strategy for tumor eradication.
Purpose: To systematically review the clinical efficacy and adverse reactions of Paclitaxel for the treatment of mammary cancer. Math: We searched Web of knowledge, PubMed, VIP information and CNKI (to October 2013) on randomised controlled trial about Paclitaxel for the treatment of mammary cancer and retrieved relevant reference and research material by hand. Two authors independently screened document, extracted data and assessed the quality according to inclusion and exclusion criteria, we finally used the software RevMan 5.2 from Cochrane for Meta-analysis. Result: 18 randomized controlled clinical study were brought into our study according to inclusion and exclusion criteria, including 10712 patients. The result of meta-analysis showed that the odds ratios of Paclitaxel for adjunctive therapy [OR = 1.64, 95% CI (1.40, 1.92), P <0.00001] was better than conventional drugs, while the overall survival was no significant difference between Paclitaxel and conventional drugs. The further Subgroup analysis showed that the efficacy of Paclitaxel for adjunctive therapy was better than cyclophosphamide [OR = 1.41, 95%C I (1. 07, 1.85), P =0. 01] and NVB [OR = 2.10, 95% CI (1.33, 3.30), P =0.001]. The adverse reactions analysis results showed the ratio of myelosuppression and alopecia by treated with Paclitaxel was improved, while the occurrence of gastrointestinal reaction rate was decreased. Conclusion: The current evidence showed Paclitaxel was effective for the adjuvant treatment of breast cancer, but the above conclusions still need future expansion of more samples, high quality RCT verify. Keyword: Paclitaxel, Breast cancer, efficacy, adverse reactions, systematically review, Meta-analysis, randomized controlled trial.
Microplastics (MPs) are widely distributed in the environment. MP pollution has been found in the environment globally, which directly threatens human health. It is of great importance to study the influencing factors and mechanism of MP migration in the vadose zone to evaluate its distribution and environmental risk accurately. Through a literature review, the source, migration, and transformation of MPs in the vadose zone were summarized, and the influencing factors of MP migration in the vadose zone were systematically expounded. The mechanism of MP migration was analyzed, and future research was suggested. The factors affecting the migration of MPs can be divided into chemical, physical, and biological categories. At present, research on the migration of MPs in the vadose zone is in its infancy. In a further study, the migration of MPs at the field scale, the synergistic migration and transformation of MPs with other pollutants and the mutual feedback mechanism, and the use of the properties and biological functions of the vadose zone to study the role and mechanism of MPs in global carbon neutralization are worthy of attention.
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