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Articles by Jie Tian
Total Records ( 2 ) for Jie Tian
  Na Li , Jia-Bo Wang , Yan-Ling Zhao , Lin Zhang , Xi-Bo Ma , Xiao-Fei Li , Jie Song , Xin Yang , Xiao-He Xiao , Jie Tian and Ting-Guo Kang
  Background: Hepatocytes damage is sometimes closely related to oxidative stress and reactive oxygen species which are the major contributors to lipopolysaccharide-induced liver injury. Emodin, the active natural product in rhubarb of hydroxyanthraquinone skeleton, has been reported of protective activity to liver tissue, whose mechanism is generally thought of antioxidation based on chemical reaction or indirect evidence. There is no visualized evidence proved the reactive oxygen species scavenging effect of emodin in vivo. Materials and Methods: The dynamic reactive oxygen species luminescent signal in mice injured by bacillus calmette guerin and lipopolysaccharide was monitored by using the optical molecular imaging approach. Results: The elevations of serum alanine aminotransferase and aspartate transaminase activities in bacillus calmette guerin/lipopolysaccharide-injured mice were reversed by emodin, indicating the protection of emodin to hepatocytes. And emodin significantly and dose-dependently attenuated the reactive oxygen species luminescent signal elicited by bacillus calmette guerin/lipopolysaccharide, indicating visually the in vivo reactive oxygen species scavenging effect of emodin. In addition, emodin significantly and dose-dependently elevated the activity of superoxide dismutase, content of reduced glutathione and total antioxidant capacity and meanwhile decreased the contents of hydrogen peroxide, lipid peroxides and malondialdehyde in livers of bacillus calmette guerin/lipopolysaccharide-injured mice. It could be attributed to the anti-oxidative effect of emodin which helps to maintain the reactive oxygen species balance in vivo. Conclusion: Emodin can protect liver against bacillus calmette guerin/lipopolysaccharide-induced injury and the mechanism includes reactive oxygen species scavenging effect and anti-lipid peroxidation at least.
  Zhili Xu , Jie Tian , Jeffrey S. Smith and Andrew P. Byrnes
  Kupffer cells (KCs) rapidly remove intravenously injected adenovirus (Ad) vectors from the circulation. A better understanding of the mechanisms involved could suggest strategies to improve Ad gene delivery by suppressing or evading KC uptake. We recently showed that clearance of Ad type 5 vectors by KCs does not involve the interaction of Ad with the well-established Ad receptors, namely, integrins or the coxsackievirus and Ad receptor (J. S. Smith, Z. Xu, J. Tian, S. C. Stevenson, and A. P. Byrnes, Hum. Gene Ther. 19:547-554, 2008). In the current study, we systematically quantified the contributions of various receptors and plasma proteins to the clearance of Ad by KCs. We found that scavenger receptors are a predominant mechanism for the clearance of Ad by KCs. In addition, we found that Ad is opsonized by natural immunoglobulin M antibodies and complement and that these opsonins play a contributory role in the clearance of Ad by KCs. We also examined additional mechanisms that have been postulated to be involved in the clearance of Ad, including the binding of Ad to platelets and vitamin K-dependent coagulation factors, but we found that neither of these were required for the clearance of Ad by KCs.
 
 
 
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