摘要：
Cholesterol efflux from lipid-loaded cells is a key athero-protective event that counteracts cholesterol uptake. The imbalance between cholesterol efflux and uptake determines the prevention or development of atherosclerosis. Many proteins and factors participate in the cholesterol efflux event. However, there are currently no systematic models of reverse cholesterol transport (RCT) that include most RCT-related factors and events. On the basis of recent research findings from other and our laboratories, we propose a novel model of one center and four systems with coupling transportation and networking regulation. This model represents a common way of cholesterol efflux; however, the systems in the model consist of different proteins/factors in different cells. In this review, we evaluate the novel model in vascular smooth muscle cells (VSMCs) and macrophages, which are the most important original cells of foam cells. This novel model consists of 1) a caveolae transport center, 2) an intracellular trafficking system of the caveolin-1 complex, 3) a transmembrane transport system of the ABC-A1 complex, 4) a transmembrane transport system of the SR-B1 complex, and 5) an extracelluar trafficking system of HDL/Apo-A1. In brief, the caveolin-1 system transports cholesterol from intracellular compartments to caveolae. Subsequently, both ABC-A1 and SR-B1 complex systems transfer cholesterol from caveolae to extracellular HDL/Apo-A1. The four systems are linked by a regulatory network. This model provides a simple and concise way to understand the dynamic process of atherosclerosis.
摘要：
A new stilbene glycoside, 5-methylresveratrol-3,4'-O-beta-D-diglucopyranoside (1), was isolated from the n-butanol fraction of the rhizomes of Veratrum dahuricum, together with five known stilbenoids: resveratrol-3-O-beta-D-glycoside (2), 4'-methylresveratrol-3-O-beta-D-glycoside (3), oxyresveratrol-4'-O-beta-D-glycoside (4), oxyresveratrol-3-O-beta-D-glycoside (5), and oxyresveratrol-3,4'-O-beta-D-diglycoside (6), and found for the first time in the investigated plant. The structures of six isolates were identified on the basis of 1D and 2D NMR data. Compounds 1-6 showed platelet aggregation inhibition, and compound 1 had an IC50 value of 383.6 mu M against platelet aggregation induced by AA.
作者机构：
[Zhang XueRu; Ren YongShen; Wang JiaBo; Zhao HaiPing; Xiao XiaoHe; Zhou CanPing; Zhao YanLing] 302 Mil Hosp China, China Mil Inst Chinese Meteria Med, Beijing 100039, Peoples R China.;[Zhang XueRu; Xia XinHua; Zhou CanPing] Hunan Univ Chinese Med, Coll Pharmaceut Sci, Changsha 410208, Hunan, Peoples R China.
通讯机构：
[Xiao XiaoHe] 3;302 Mil Hosp China, China Mil Inst Chinese Meteria Med, Beijing 100039, Peoples R China.
关键词：
"Cold" and " Hot" natures of Chinese medicine;evaluation;temperature tropism;ethology;drug process;Coptis chinensis Franch
摘要：
The description and differentiation of the so-called "Cold" and "Hot" natures, the primary "Drug Naure" of Chinese medicine, is the focus of theoretical research. In this study, the divergency between the "Cold" and the "Hot" natures was investigated through examining the temperature tropism of mice affected by Coptis chinensis Franch and its processed materials by using a cold/hot plate differentiating technology. After exposure to C. chinensis Franch, the macroscopic behavioral index of the remaining rate (RR) on a warm pad (40 A degrees C) significantly increased (P < 0.05), suggesting the enhancement of Hot tropism. The internal indexes of adenosine triphosphatase (ATPase) activity and oxygen consuming volume decreased significantly (P < 0.05), suggesting the decapability of energy metabolism. This external behavior of Hot tropism might reflect the internal Cold nature of C. chinensis Franch. However, the processed materials of C. chinensis Franch exhibited a different Cold nature in temperature tropism compared with crude C. chinensis Franch (CC): the Cold nature of bile-processed C. chinensis Franch (BC) enhanced while the ginger-processed C. chinensis Franch (GC) changed inversely. The changing sequence was consistent with the theoretical prognostication. It is indicated that the external Cold & Hot natures of Chinese medicine may possibly reflect in an ethological way for the changes of animal's temperature tropism which might be internally regulated by the body's energy metabolism.
作者机构：
[Wu Yan-shu; Zhang Qian; Jin Cheng; Xiao Xiao-he; Yan Dan] 302 Mil Hosp China, PLA Inst Chinese Mat Med, Beijing 100039, Peoples R China.;[Wu Yan-shu; Zhang Qian; Wang Jian] Chengdu Univ Tradit Chinese Med, Coll Pharm, Chengdu 611137, Peoples R China.;[Jiao Yi] Hunan Univ Tradit Chinese Med, Coll Pharm, Changsha 410002, Hunan, Peoples R China.;[Du Xiao-xi] State Food & Drug Adm, Ctr Drug Evaluat, Beijing 100038, Peoples R China.
通讯机构：
[Xiao Xiao-he] 3;302 Mil Hosp China, PLA Inst Chinese Mat Med, Beijing 100039, Peoples R China.
摘要：
Aim of the study: The inhibitive effect of BuYang HuanWu Decoction (BYHWD) and its major components on vascular intimal hyperplasia and the expressions of cell cycle protein and extracellular matrix protein. Materials and methods: Sprague-Dawley rats were randomly divided into sham-operated, control, alkaloid, glycoside, BYHWD and atorvastatin groups. Rat aorta intima in all groups were injured by insesion of domestic balloon catheter into the aortae except sham-operated rats. Drugs were administrated orally from the second day after vascular injury and continued for 14 days. The injured segments of aortae were collected on the sixteenth day after operation to observe the morphological changes of vascular structure and to examine the expressions of proteins in vascular cells associated with cell cycle including proliferating cell nuclear antigen(PCNA), cyclinD(1) and cyclinE, and extracellular matrix(ECM) proteins including collagen I (Col-1) and fibronectin (FN), further to discover the involved biologically active substances and the potential mechanisms. Results: Alkaloid and glycosid isolated from BYHWD were more effective than BYHVVD in the inhibition of intimal hyperplasia and the expressions of PCNA, cyclinD(1), cychnE, Col-I and FN, suggesting that alkaloid and glycoside may be the main components of BYHWD responsible for the observed inhibition of excessive hyperplasia of vascular intima. Conclusions: The mechanism associated with the anti-hyperplasia activity of BYHVVD and its effective components may be related to the blockage of cell cycles of VSMC, and the inhibition of the ECM protein synthesis, even the increased degradation of ECM proteins. (C) 2009 Elsevier Ireland Ltd. All rights reserved.
关键词：
Adult-onset type II citrullinemia (CTLN2);Aspartate-glutamate carrier (AGC);Citrin;Malate-aspartate shuttle;Neonatal intrahepatic cholestatic hepatitis (NICCD);Retrotransposal insertion;SLC25A13
摘要：
Deficiency of citrin, liver-type mitochondrial aspartate-glutamate carrier, is an autosomal recessive disorder caused by mutations of the SLC25A13 gene on chromosome 7q21.3 and has two phenotypes: neonatal intrahepatic cholestatic hepatitis (NICCD) and adult-onset type II citrullinemia (CTLN2). So far, we have described 19 SLC25A13 mutations. Here, we report 13 novel SLC25A13 mutations (one insertion, two deletion, three splice site, two nonsense, and five missense) in patients with citrin deficiency from Japan, Israel, UK, and Czech Republic. Only R360X was detected in both Japanese and Caucasian. IVS16ins3kb identified in a Japanese CTLN2 family seems to be a retrotransposal insertion, as the inserted sequence (2,667-nt) showed an antisense strand of processed complementary DNA (cDNA) from a gene on chromosome 6 (C6orf68), and the repetitive sequence (17-nt) derived from SLC25A13 was found at both ends of the insert. All together, 30 different mutations found in 334 Japanese, 47 Chinese, 11 Korean, four Vietnamese and seven non-East Asian families have been summarized. In Japan, IVS16ins3kb was relatively frequent in 22 families, in addition to known mutations IVS11 + 1G > A, 851del4, IVS13 + 1G > A, and S225X in 189, 173, 48 and 30 families, respectively; 851del4 and IVS16ins3kb were found in all East Asian patients tested, suggesting that these mutations may have occurred very early in some area of East Asia.
期刊：
JOURNAL OF PHYSICAL CHEMISTRY A,2008年112(2):305-311 ISSN：1089-5639
通讯作者：
Xiao, Xiaoming
作者机构：
[Rong, Chunying; Xiao, Xiaoming; Liu, Shubin; Huang, Ying] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.;[Huang, Ying] Hunan Univ Tradit Chinese Med, Sch Pharm, Changsha 410007, Hunan, Peoples R China.;[Zhong, Aiguo] Taizhou Coll, Dept Chem, Linhai 317000, Zhejiang, Peoples R China.;[Liu, Shubin] Univ N Carolina, Renaissance Comp Inst, Chapel Hill, NC 27599 USA.
通讯机构：
[Xiao, Xiaoming] H;Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
摘要：
Porphyrin and pincer complexes are both important categories of compounds in biological and catalytic systems. The idea to combine them is computationally investigated in this work. By employment of density functional theory (DFT), conceptual DFT, and time-dependent DFT approaches, structure, spectroscopy, and reactivity properties of porphyrin pincers are systematically studied for a selection of divalent metal ions. We found that the porphyrin pincers are structurally and spectroscopically different from their precursors and are more reactive in electrophilic and nucleophilic reactions. A few quantitative linear/exponential relationships have been discovered between bonding interactions, charge distributions, and DFT chemical reactivity indices. These results are implicative in chemical modification of hemoproteins and understanding chemical reactivity in heme-containing and other biologically important complexes and cofactors.
作者机构：
[Liu, Hao-Ran; Zeng, Chun-Jiao; Liu, Ying-Lin; Li, Yan-Lai] Hunan Univ, Dept Pharmacol, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[He, Hai-Bo] Zhejiang Univ, Inst Chinese Herb Med, Coll Pharmaceut Sci, Hangzhou 310058, Zhejiang, Peoples R China.;[Peng, Xiang-Dong] Cent S Univ, Xiangya Hosp 3, Dept Pharm, Changsha, Hunan, Peoples R China.;[He, Gui-Xia] Hunan Univ TCM, Coll Pharm, Dept Nat Pharmaceut Chem, Changsha, Hunan, Peoples R China.
通讯机构：
[He, Hai-Bo] Z;Zhejiang Univ, Inst Chinese Herb Med, Coll Pharmaceut Sci, Hangzhou 310058, Zhejiang, Peoples R China.
摘要：
Total saponin of Solanum lyratum Thunb (TSSLT), a species of natural biologically active substances isolated from Solanum lyratum Thunb, possesses various bioactivities. It has been proposed that the induction of apoptosis may be the basis of its antitumor activity. However, the molecular mechanism underlying the total saponin-induced apoptotic process remains unknown. In the present study, we describe the anti-proliferative effect of TSSLT on human cervical cancer cells (Hela). The TSSLT induced apoptosis of Hela in a time-dependent manner with an IC50 for cell viability of 6 μg/ml. The TSSLT-induced cell death was characterized by changes in cell morphology, DNA fragmentation, activation of caspase-like activities, poly (ADP-ribose) polymerase (PARP) cleavage and release of cytochrome c (cyt c) into cytosol. TSSLT activated various caspases such as caspase-3, -8, and -9 (like) activities but not caspase-1 like activity. The cell death was completely prevented by the pan caspase inhibitor benzyloxy carbonyl-Val-Ala-Asp- fluoromethyl-ketone (Z-VAD-FMK). More than 80% cell survival was observed in the presence of a caspase-3 inhibitor. In addition, treatment with TSSLT induced the increase of Bax:Bcl-2 ratio in Hela cells. These results suggest that the induction of apoptosis by TSSLT involves multiple pathways antigen including death receptor and mitochondrial pathway and strongly suggest that the mitochondrial pathway was mediated by low expression of Bcl-2 and upregulation of Bax, release of cyt c and subsequent activation of caspase-3 followed by down stream events leading to apoptotic cell death.
摘要：
A dye intermediate, 1-amino-8-naphthol-3,6-disulfonic acid sodium (ANDS) was first used to selectively recognize Hg(II) in aqueous solutions with its fluorescence being strong quenched. The fluorescence quenching of ANDS was attributed to the formation of an inclusion complex between Hg(II) and ANDS by 2:1 complex ratio (K= 6.2 x 10(9)), which has been utilized as the basis of the fabrication of the Hg(II)-sensitive fluorescent chemosensor. The analytical performance characteristics of the proposed chemosensor were investigated. The sensor shows a linear response toward Hg(II) in the concentration range 2.9 x 10(-6) to 5.5 x 10(-5) M with a limit of detection of 5.3 x 10(-7) M, and a working pH range from 5.0 to 9.0. It shows excellent selectivity for Hg(II) over a large number of cations such as alkali, alkaline earth and transitional metal ions. The proposed method was utilized successfully for the detection of Hg2+ in water samples. (C) 2007 Elsevier B.V. All rights reserved.
摘要：
A novel flavanone glycoside has been isolated from the Chinese crude drug ''mu tong'' which is used in Hunan province, China. The structure of this new natural product is identified as 5,4'-dihydroxy-3'-methoxyflavanone-7-(6''-O-beta-L-rhamnopyranosyl)-beta-D-glucopyranoside by H-1, C-13 NMR, COSY, H-1, C-13 HETCOR, LOCOR and 1D NOE-difference spectra.
