Time filter

Source Type

Tang N.,Shaanxi Institute for Food and Drug Control
Zhonghua nan ke xue = National journal of andrology | Year: 2013

To evaluate the safety of intracytoplasmic sperm injection (ICSI) in the mouse model. We simulated clinical ICSI technology and comprehensively evaluated it by parthenogenetic activation, immunofluorescence, embryo transplantation, examination of early implantation, and measurement of the crown-rump length (CRL). ICSI significantly reduced the ability of preimplantation embryo development of the mouse, especially after the 8-cell stage (P < 0.01). The fluorescence of H3K9 dimethylation was abnormal at the male pronuclei of the embryos derived from ICSI. Further examination of the development of the transferred ICSI embryos indicated no significant difference in the rate of early implantation at E5. 5 days as compared with normal fertilization (P = 0.6), but the percentage of "normal embryos" was decreased significantly at E9.5 days (P < 0.01). Obvious growth retardation phenotype was observed even in the normal ICSI embryos at E9.5 days. ICSI might result in growth retardation of embryos by affecting H3K9 dimethylation in the male pronuclei.

Feng B.,Xian Jiaotong University | Jin J.,Xian Jiaotong University | Wang C.,Shaanxi Institute for Food and Drug Control | Song J.,Xian Jiaotong University | And 2 more authors.
Journal of Separation Science | Year: 2012

In order to determine isoflavone glycosides (calycosin-7-O-β-d- glucoside and formononetin-7-O-β-d-glucoside) and aglycones (calycosin and formononetin), a simple HPLC method with isocratic elution employing hydroxypropyl-β-cyclodextrin (HP-β-CD) as a mobile phase additive was developed. Various factors affecting the retention of isoflavone glycosides and aglycones in the C18 reversed-phase column, such as the nature of cyclodextrins, HP-β-CD concentration, and methanol concentration, were systematically studied. The results show that HP-β-CD, as a very effective mobile phase additive, can markedly reduce the retention of isoflavone glycosides and aglycones, and the decrease magnitudes of isoflavone aglycones are more than those of their glycosides. The role of HP-β-CD in the developed HPLC method is attributed to the formation of the inclusion complexes between isoflavone glycosides (or aglycones) and HP-β-CD. So, the apparent formation constants of the isoflavone glycosides (or aglycones)/HP-β-CD inclusion complexes also were investigated. Isoflavone glycosides (and aglycones) form the 1:1 inclusion complexes with HP-β-CD, and the isoflavone aglycones/HP-β-CD complexes are more stable than the isoflavone glycosides/HP-β-CD complexes. Finally, the optimized method was successfully applied for the determination of isoflavone glycosides and aglycones in Radix Astragali samples. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zeng A.,Xian Jiaotong University | Wang C.,Shaanxi Institute for Food and Drug Control | Yuan B.,Xian Jiaotong University | Yang G.,Xian Jiaotong University | Fu Q.,Xian Jiaotong University
Drug Development and Industrial Pharmacy | Year: 2010

Purpose: This study was aimed at investigating the possible relationship between the physical properties and the permeation of S-amlodipine and RS-amlodipine and studying the possible enantioselectivity of permeation of amlodipine in the presence and absence of enhancers, such as terpene enhancers and ethanol. Method: The solubility of S-amlodipine and RS-amlodipine was measured using the shake-flask method. The thermodynamic properties were investigated by differential scanning calorimetry (DSC). The type of racemate amlodipine was investigated by DSC and Fourier transform infrared spectroscopy (FTIR). The permeability of racemate and enantiomers of amlodipine through rat epidermis in vitro was investigated using the modified Franz diffusion cell. Results: The aqueous solubility of S-amlodipine was higher than that of RS-amlodipine. The melting temperature and enthalpy of fusion of S-amlodipine were lower than those of RS-amlodipine. RS-amlodipine was a racemic compound. The permeation of the enantiomers of amlodipine from RS-amlodipine reservoir showed no significant differences in the presence and absence of enhancers, but the permeation of S-amlodipine from S-amlodipine reservoir was significantly higher than that of RS-amlodipine from RS-amlodipine reservoir 30 ethanol, 50 ethanol, and terpene enhancers could not influence the difference in permeation between S-amlodipine and RS-amlodipine, but 75 ethanol could reduce the difference. Conclusion: These results suggested that there was no enantioselectivity of the enantiomers of amlodipine from RS-amlodipine reservoir in the presence and absence of enhancers, but the differences in physical properties between S-amlodipine and RS-amlodipine led to the difference in permeation across rat skins. © Informa UK, Ltd.

Mao J.,Xian Jiaotong University | Mao J.,Affiliated Hospital of xiAn Medical College | Liu J.,Xian Jiaotong University | Pang X.,Xian Jiaotong University | And 5 more authors.
Molecules and Cells | Year: 2012

Atherosclerosis is an inflammatory disease in the vessel wall. Nicotine, a major component of cigarette smoke, is an independent risk factor for cardiovascular diseases including atherosclerosis. As an inflammatory molecule, C- reactive protein (CRP) participates in atherogenesis. Although it has been confirmed that CRP level in smoking patient is significantly higher than non-smokers and cigarette withdrawal,it is unknown whether nicotine induces CRP expression in macrophages. The present study was to observe effect of nicotine on CRP production and the related signal pathway in U937 macrophages. The results showed that nicotine significantly increased mRNA and protein expression of CRP in U937 macrophages in timeand concentration-dependent ways. Nicotinic acetylcholine receptor (nAChR) blocker hexamethonium, MEK1/2 inhibitor PD98059, p38 MAPK inhibitor SB203580 and NF- ?B inhibitor PDTC almost completely abolished nicotineinduced CRP expression in mRNA and protein levels in U937 macrophages. The further study indicated that hexamethonium, PD98059, and SB203580 significantly inhibited ERK1/2 and p38 MAPK phosphorylation. These demonstrate that nicotine has ability to induce CRP expression in macrophages through nAChR-ERK1/2/p38 MAPK-NF-kB signal pathway, which contributes to better understanding of the pro-inflammatory and pro-atherosclerotic effects of nicotine in cigarette smokers. © The Korean Society for Molecular and Cellular Biology.

Pang X.,Xian Jiaotong University | Liu J.,Xian Jiaotong University | Zhao J.,Xian Jiaotong University | Mao J.,The Affiliated Hospital of Xian Medical College | And 6 more authors.
Atherosclerosis | Year: 2014

Objective: Homocysteine (Hcy) is known as an independent risk factor for atherosclerosis. C-reactive protein (CRP) directly participates in initiation and progression of atherosclerosis. However, there is no direct evidence to demonstrate pro-inflammatory effect of Hcy on vascular smooth muscle cells (VSMCs) through CRP. In the present study, we examined the effect of Hcy on CRP expression and investigated the related mechanism in VSMCs. Methods and results: Protein expression and secretion were detected by Western blot and ELISA, respectively. mRNA expression was detected by RT-PCR. Superoxide anion was detected by lucigenin chemiluminometry and the immunofluorescence staining was observed by a fluorescence microscope. The results revealed that Hcy significantly induced mRNA and protein expressions of CRP in VSMCs both invitro and invivo, and anti-IL-1β or anti-IL-6 neutralizing antibody alone or in combination partially reduced Hcy-induced CRP expression. Hcy increased the expression of NR1 subunit of N-methyl- d-aspartate receptor (NMDAr), and MK-801 alleviated Hcy-induced CRP expression in VSMCs. Further studies showed that Hcy-stimulated superoxide anion generation in VSMCs. Nevertheless, pretreatment of the cells with MK-801, TTFA and DPI significantly reduced Hcy-stimulated superoxide anion generation, and antioxidant NAC decreased Hcy-induced CRP expression in VSMCs. Additionally, PD98059, SB205380 or PDTC antagonized Hcy-induced CRP expression, and MK-801, NAC, PD98059 or SB205380 inhibited Hcy-activated phosphorylations of ERK1/2 and p38. Conclusion: The present study demonstrates that Hcy is able to initiate an inflammatory response in VSMCs by stimulating CRP production, which is mediated through NMDAr-ROS-ERK1/2/p38-NF-κB signal pathway. These findings provide new evidence for a role of Hcy in pathogenesis of atherosclerosis. © 2014 Elsevier Ireland Ltd.

Discover hidden collaborations