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QRAR models for cardiovascular system drugs using biopartitioning micellar chromatography 总被引:1,自引:0,他引:1
Wang S Yang G Zhang H Liu H Li Z 《Journal of chromatography. B, Analytical technologies in the biomedical and life sciences》2007,846(1-2):329-333
The capability of biopartitioning micellar chromatography (BMC) to describe and estimate pharmacological parameters of cardiovascular system drugs has been studied. The retention of cardiovascular system drugs was studied using different pH of Brij-35 as micellar mobile phase in modified C(18) stationary phase. Quantitative retention-activity relationships (QRAR) in BMC were investigated for these compounds. An adequate correlation between the retention factors (log k) and the toxicity (LD(50)) of cardiovascular system drugs was obtained. 相似文献
33.
Bone osteoblasts and osteocytes express large amounts of connexin (Cx) 43, the component of gap junctions and hemichannels. Previous studies have shown that these channels play important roles in regulating biological functions in response to mechanical loading. Here, we characterized the distribution of mRNA and protein of Cx43 in mechanical loading model of tooth movement. The locations of bone formation and resorption have been well defined in this model, which provides unique experimental systems for better understanding of potential roles of Cx43 in bone formation and remodeling under mechanical stimulation. We found that mechanical loading increased Cx43 mRNA expression in osteoblasts and bone lining cells, but not in osteocytes, at both formation and resorption sites. Cx43 protein, however, increased in both osteoblasts and osteocytes in response to loading. Interestingly, the upregulation of Cx43 protein by loading was even more pronounced in osteocytes compared to other bone cells, with an appearance of punctate staining on the cell body and dendritic process. Cx45 was reported to be expressed in several bone cell lines, but here we did not detect the Cx45 protein in the alveolar bone cells. These results further suggest the potential involvement of Cx43-forming gap junctions and hemichannels in the process of mechanically induced bone formation and resorption. 相似文献
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Qu Wenchuan Xue Bin Dickman M. D. Wang Sumin Fan Chengxin Wu Ruijin Zhang Pingzhong Chen Jianfa Wu Yanhong 《Hydrobiologia》2000,430(1-3):113-120
Effect of leaf extract of Ocimum sanctum on (i) the specific and non-specific immune responses and (ii) disease resistance against Aeromonas hydrophila was investigated in Oreochromis mossambicus. Sheep red blood cells (SRBC) and Heat aggregated bovine serum albumin (HA-BSA) were used as antigens for specific and non-specific immune response studies, respectively. Antigens were administered through intraperitoneal route. Anti-SRBC antibody titres were determined by direct haemagglutination and anti-bacterial antibodies were determined by bacterial agglutination. Nitroblue tetrazolium (NBT) assay was used to determine neutrophil activity. Disease resistance was measured in terms of relative percent survival (RPS). The immunostimulatory effect of the leaf extract of O. sanctum, when administered through intraperitoneal and oral routes was obvious. Leaf extract of O. sanctum, when administered intraperitoneally, stimulated both antibody response and neutrophil activity. Dietary intake of O. sanctum also enhanced the antibody response and disease resistance against A. hydrophila. Possibility of using O. sanctum as immunostimulant in the maintenance of finfish health in intensive freshwater aquaculture is suggested. 相似文献
36.
DANIEL TRAN TAKASHI KADONO MARIA LIA MOLAS RAFIK ERRAKHI JOËL BRIAND BERNADETTE BILIGUI TOMONORI KAWANO FRANÇOIS BOUTEAU 《Plant, cell & environment》2013,36(3):569-578
Ozone (O3) is an air pollutant with an impact increasingly important in our industrialized world. It affects human health and productivity in various crops. We provide the evidences that treatment of Arabidopsis thaliana with O3 results in ascorbate‐derived oxalic acid production. Using cultured cells of A. thaliana as a model, here we further showed that oxalic acid induces activation of anion channels that trigger depolarization of the cell, increase in cytosolic Ca2+ concentration, generation of reactive oxygen species and cell death. We confirmed that O3 reacts with ascorbate in the culture, thus resulting in production of oxalic acid and this could be part of the O3‐induced signalling pathways that trigger programmed cell death. 相似文献
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Removal of estrogenic activity from endocrine-disrupting chemicals by purified laccase of Phlebia tremellosa 总被引:2,自引:0,他引:2
A white-rot basidiomycete, Phlebia tremellosa, produced a laccase that showed increased activity during degradation of phthalates. A laccase was purified through the ion exchange chromatography and preparative gel electrophoresis, and the estimated molecular weight was 75 kDa. The optimum pH and temperature of the purified laccase was pH 4.0 and 20 degrees C, respectively. The K(m) value of the enzyme was 55.7 microM, and the V(max) was 0.0541 OD min(-1) U(-1) for o-tolidine. Purified laccase reduced the estrogenic activity of four different endocrine-disrupting chemicals. However, this effect was reduced by a laccase inhibitor, kojic acid, which confirmed that the laccase was involved in the removal of estrogenic activity. 相似文献
39.
Allen C. Chen Sumin Kim Nina Shepardson Sarvagna Patel Soyon Hong Dennis J. Selkoe 《The Journal of cell biology》2015,211(6):1157-1176
Many single-transmembrane proteins are sequentially cleaved by ectodomain-shedding α-secretases and the γ-secretase complex, a process called regulated intramembrane proteolysis (RIP). These cleavages are thought to be spatially and temporally separate. In contrast, we provide evidence for a hitherto unrecognized multiprotease complex containing both α- and γ-secretase. ADAM10 (A10), the principal neuronal α-secretase, interacted and cofractionated with γ-secretase endogenously in cells and mouse brain. A10 immunoprecipitation yielded γ-secretase proteolytic activity and vice versa. In agreement, superresolution microscopy showed that portions of A10 and γ-secretase colocalize. Moreover, multiple γ-secretase inhibitors significantly increased α-secretase processing (r = −0.86) and decreased β-secretase processing of β-amyloid precursor protein. Select members of the tetraspanin web were important both in the association between A10 and γ-secretase and the γ→α feedback mechanism. Portions of endogenous BACE1 coimmunoprecipitated with γ-secretase but not A10, suggesting that β- and α-secretases can form distinct complexes with γ-secretase. Thus, cells possess large multiprotease complexes capable of sequentially and efficiently processing transmembrane substrates through a spatially coordinated RIP mechanism. 相似文献
40.
An increasing progress on the role of Hedgehog (Hh) signaling for carcinogenesis has been achieved since the link of Hh pathway to human cancer was firstly established. In particular, the critical role of Hh signaling in the development of Basal cell carcinoma (BCC) has been convincingly demonstrated by genetic mutation analyses, mouse models of BCCs, and successful clinical trials of BCCs using Hh signaling inhibitors. In addition, the Hh pathway activity is also reported to be involved in the pathogenesis of Squamous Cell Carcinoma (SCC), melanoma and Merkel Cell Carcinoma. These findings have significant new paradigm on Hh signaling transduction, its mechanisms in skin cancer and even therapeutic approaches for BCC. In this review, we will summarize the major advances in the understanding of Hh signaling transduction, the roles of Hh signaling in skin cancer development, and the current implications of “mechanism-based” therapeutic strategies. 相似文献