201011Quu(3).pdf 氧气是需氧生物不可缺少的物质,但氧气本身也有毒性,最典型的就是呼吸纯氧可以引起肺损伤。这种肺损伤是对肺功能障碍患者急救吸氧时遇到的严重问题,不吸氧会缺氧,吸氧会导致肺功能进一步恶化,一旦患者遇到这种进退不得的局面,往往无法挽救生命。氢气作为一种治疗性气体,最近发现呼吸氢气对移植肺损伤有很好的保护作用,这种作用和血红素加氧酶 heme oxygenase (HO)-1 被诱导有关系,为证明呼吸氢气是否可以保护高氧诱导的肺损伤以及机制,本研究将大鼠随机分成 4 组,分别将不同混合气体处理动物 60 小时, 98% 氧气 2% 氮, 98% 氧气 2% 氢, 98% 空气 2% 氮, 98% 空气 2% 氢。然后用血液气体分析检测肺功能,肺损伤程度和 HO-1 表达情况。同时检测 Nrf 2 ,以及氢气对 Nrf 2 基因缺乏动物肺损伤的作用。结果发现,氢气可以显著提高血氧饱和度,减少炎症反应,诱导 HO-1 表达,但在 Nrf 2 基因缺乏动物,氢气无法产生保护作用,也无法诱导 HO-1 表达。这些结果说明,氢气可以对抗高氧引起的肺损伤,这种保护作用和 Nrf 2 以来的抗氧化基因表达有关。实验结束后,没有经过治疗的动物64小时内几乎全部死亡,而治疗组动物平均存活时间72小时。 这一研究提示氢气可以作为治疗高氧肺损伤,对临床上挽救这些患者的生命提供一种潜在手段,这种保护作用的分子机制和氢气诱导内源性抗氧化系统有关。 这是第一次比较明确的分子机制研究,说明氢气的许多抗氧化作用并不是自己的抗氧化作用,而是通过提高细胞自身的抗氧化能力实现的。将来的研究应该分析氢气为什么具有诱导NRF2的作用。是直接调节,还是通过其他分子间接发挥作用。毕竟现在找到一个比较重要的分子靶点。本研究值得关注。 Am J Physiol Lung Cell Mol Physiol. 2013 Mar 8. Hydrogen gas reduces hyperoxic lung injury via the Nrf2 pathway in vivo. Kawamura T, Wakabayashi N, Shigemura N, Huang CS, Masutani K, Tanaka Y, Noda K, Peng X, Takahashi T, Billiar TR, Okumura M, Toyoda Y, Kensler TW, Nakao A. 1University of Pittsburgh Medical Center. Hyperoxic lung injury is a major concern in critically ill patients who receive high concentrations of oxygen to treat lung diseases. Successful abrogation of hyperoxic lung injury would have a huge impact on respiratory and critical care medicine. Hydrogen can be administered as a therapeutic medical gas. We recently demonstrated that inhaled hydrogen reduced transplant-induced lung injury and induced heme oxygenase (HO)-1. To determine whether hydrogen could reduce hyperoxic lung injury and investigate the underlying mechanisms, we randomly assigned rats to 4 experimental groups and administered the following gas mixtures for 60 hours: 98% oxygen (hyperoxia), 2% nitrogen; 98% oxygen (hyperoxia), 2% hydrogen; 98% balanced air (normoxia), 2% nitrogen; and 98% balanced air (normoxia), 2% hydrogen. We examined lung function by blood gas analysis, extent of lung injury, and expression of HO-1. We also investigated the role of NF-E2-related factor (Nrf) 2, which regulates HO-1 expression, by examining the expression of Nrf2-dependent genes and the ability of hydrogen to reduce hyperoxic lung injury in Nrf2-deficient mice. Hydrogen treatment during exposure to hyperoxia significantly improved blood oxygenation, reduced inflammatory events, and induced HO-1 expression. Hydrogen did not mitigate hyperoxic lung injury or induce HO-1 in Nrf2-deficient mice. These findings indicate that hydrogen gas can ameliorate hyperoxic lung injury through induction of Nrf2-dependent genes, such as HO-1. The findings suggest a potentially novel and applicable solution to hyperoxic lung injury, and provide new insight into the molecular mechanisms and actions of hydrogen. PMID: 23475767
Ratiometric optical oxygen sensing: a review in respect of material design Analyst, 2012, 137, 4885–4901. Yan Feng, Jinghui Cheng, Li Zhou, Xiangge Zhou and Haifeng Xiang * Overview of the latest developments in the field of ratiometric optical oxygen sensing . The quantitative determination of oxygen concentration is essential for a variety of applications ranging from life sciences to environmental sciences. Optical oxygen sensing allows noninvasive measurements with biological objects, parallel monitoring of multiple samples, and imaging. In general, r atiometric optical oxygen sensing is more desired, due to its advantages of the selectivity, insensitivity to ambient or scattered light, and elimination of instrumental fluctuation. Moreover, it can provide the perceived colo u r change, which would be useful not only for the ratiometric method of detection but also for rapid visual sensing. Mainly focusing on material design for ratiometric measurement, this review describes the overall progress made in the past ten years on ratiometric optical ground-state triplet oxygen sensing and offers a critical comparison of various methods reported in the literature. It also provides a development blueprint for ratiometric optical oxygen sensing.
“ Tunable fluorescent/phosphorescent platinum(II) porphyrin-fluorene copolymers for ratiometric dual emissive oxygen sensing ”, Inorg. Chem. , 2012 , 51, 5208 - 5212 . H. F. Xiang ,* L. Zhou, Y. Feng, J. H. Cheng, D. Wu, and Xiangge Zhou,* Full text (PDF) A series of new platinum(II) 5,15-bis(pentafluorophenyl)-10,20-bisphenylporphyrin-9,9-dioctyl-fluorene copolymers, in which the relative intensities of the blue fluorescence and red phosphorescence are tunable, have been designed and prepared for the application in ratiometric dual emissive oxygen sensing.
水是地球上比较丰富的资源,是真正的“水星”。H 2 O中的氧是负二价,如何简便、高效地将负二价的氧变成零价的氧,也是化学家们非常感兴趣的课题。 最近,瑞典的科学家在 Nature Chemistry 上发表了一篇研究论文,报道了一种新型分子催化剂,它可以快速地将H 2 O氧化成O 2 (同时生成H 2 )。在石油、天然气和煤等化石能源日益紧缺的情况下,这一研究成果对未来太阳能和其它可再生能源的利用具有重要价值。 这支来自斯德哥尔摩KTH皇家技术研究所( the Royal Institute of Technology )的由Licheng Sun教授领衔的研究团队,首次实现了可与自然界光合作用的速度媲美的氧化过程,创造了一项“世界纪录”。此前,欧洲、日本和美国等地的科学家已经对人造光合作用研究了30多年,但没有一支团队成功地实现如此快速的太阳能驱动的水氧化转化。 Sun教授认为,在模拟光合作用研究中,速度是个难题,也是技术应用的瓶颈。而如今,他们所开发的这项新技术,可以实现超越每秒300次的转化,就算是自然界的光合作用也只有100至400次/秒的转化速度。这个成果,完全可以说是一项突破性的进展。未来,人们如果能在诸如撒哈拉大沙漠这样的阳光充足的地方建造规模化的装置,就可以充分利用太阳能来制备氢气,或者使其与传统的太阳能电池结合,就可以将太阳能高效地转化为电能。 参考文献: Duan, L. et al. 'A molecular ruthenium catalyst with water-oxidation activity comparable to that of photosystem II', Nature Chemistry , 2012. doi:10.1038/nchem.1301
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Anti-inflammatory effect of hydrogen-rich saline in a rat model of regional myocardial ischemia and reperfusion. International Journal of Cardiology.2010; in press pdf 43. Sun Q, Cai JM, Liu SL, Liu Y, Xu WG, Tao HY, Sun XJ. Hydrogen-rich saline provides protection against hyperoxic lung injury. J Surg Res. 2011 ;165:e43e49 pdf offprint 44. Chen X, et al. Lactulose: an indirect antioxidant ameliorating inflammatory bowel disease by increasing hydrogen production. Medical Hypotheses 2010 pdf1 45. Sun H, Chen L, Zhou W, Hu L, Li L, Tu Q, Chang Y, Liu Q, Sun X, Wu M, Wang H.The Protective Role of Hydrogen -Rich Saline in Experimental Liver Injury in Mice. J Hepatology. 2010; in press 46. Sun Q, Cai JM,Zhou JR,Tao HY,Zhang JH,Zhang W,Sun XJ.Hydrogen-rich saline reduces delayed neurologic sequelae in experimental carbon monoxide toxicity. Critical Care medicine. 2010 in press 47. Wang F, Yu G, Liu SY, Li JB, Wang JF, Bo LL, Sun XJ, Deng XM. . Hydrogen-rich saline protects against renal ischemia/reperfusion injury in rats. J Surg Res.2010; in press pdf 48. Fang Y. Fu XJ, Gu C, Xu P, Wang Y, Yu WR, Sun Q, Sun XJ, Yao M. Hydrogen-Rich Saline Protects against Acute Lung Injury Induced by Extensive Burn in Rat Model. J Burn Care Res.in press 49. Liu Y, Xue F, Liu GK, Wang X, Liu Y, Liu WW, Xu L, Sun XJ. Helium preconditioning attenuates hypoxia/ischemia-induced injury in the developing brain. Brain res. 2011. in press 50 . Liu SL, Liu K, Sun Q, Liu WW, Xu WG, Denoble P, Tao HY, Sun XJ. Consumption of hydrogen water reduces paraquat-induced acute lung injury in rats. J Biomed Biotechnol. 2011; Medline 论文目录 Sun Xuejun in Scopus SMMU sudf Caoxt Wumc 前这些论文的引用情况不太理想 , 但 08 和 09 年的文章我们充满自信 , 估计部分论文的引用在 1 年内能超过 10 次 . 请各位老师监督 . 我随时汇报。 * 为通讯作者