Guiyang Medical University
Guiyang, China

Guiyang Medical University is a public university based in Guiyang, capital of Guizhou province in China. Wikipedia.

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Zhou W.,Guiyang Medical University | Zhang X.-Y.,Hubei University of Medicine
American Journal of Chinese Medicine | Year: 2013

Radix isatidis (R. isatidis) (Banlangen) is a traditional Chinese medicine (TCM) famous for its broad antiviral activity. Its clinical medical history spans several thousands of years in China. Many scientists and scholars have conducted systematic research on this herb from its pharmacognosy to pharmaceuticals, especially in China. Through our research and literature reports, we inferred that the antiviral activity of R. isatidis mostly depended on the water-soluble part, including amino acids, IRPS, nucleosides, and sulfur-containing alkaloids. By playing a role in directly killing pathogenic viruses or regulating the immune system to enhance anti-virus ability, R. isatidis's biological activities mostly depend on the synergistic effect of its multiple components. This article aims to expand understanding of R. isatidis in the following aspects including medicinal resources, chemical constituents, pharmacological activities, clinical applications, and separation and analytical technologies. © 2013 World Scientific Publishing Company Institute for Advanced Research in Asian Science and Medicine.

Yan Z.,Columbia University | Yan H.,Zhejiang University | Ou H.,Guiyang Medical University
Gene | Year: 2012

The liver performs a vital role in metabolic process, which makes it an attractive target organ for gene therapy. To improve the effects of gene therapy in disorders caused by metabolic disturbance, we quantitatively evaluated six promoters, CMV, EF1α, PGK, apoE, thyroxine binding globulin (TBG), and cytochrome P450 2E1 (CYP2E1) by measuring the expression of α1-antitrypsin, which is controlled by these promoters and introduced via a lentivirus-mediated delivery system in the liver. The results showed that the TBG promoter presents as highly active though in general it is slightly lower than the ubiquitous CMV and EF1α. The expression of exogenous genes driven by the TBG promoter demonstrates to be much higher than by PGK, apoE, and CYP2E1 promoters, and the fragment of -. 435. bp to -. 26. bp from transcription start site (TSS) in the TBG promoter region is identified as the optimum region to direct transgene expression at a higher level. In addition, we further confirmed that the TBG promoter confers transgene persistent and specific expression within the liver up to several months after integration. The data suggests that the TBG promoter is a valuable tool and will greatly facilitate the optimization of vector design in hepatic gene therapy. © 2012 Elsevier B.V.

Yao M.,Guiyang Medical University
Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine] | Year: 2013

OBJECTIVE: To establish coal arsenic poisoning rat model by feeding the rats with the corn powder baked by high arsenic coal as the main raw material.METHODS: Fifty Wistar rats, healthy, were randomly divided into 5 groups according to the figures of their weights, including control group, drinking arsenic poisoning water group, low, medium and high arsenic contaminated grain group, 10 rats for each.Rats in control group and drinking arsenic poisoning water group were fed with standard feed without any arsenic containing. Rats in water group would drink 100 mg/L As2O3 solution and the rats in arsenic grain groups would be fed with the arsenic contaminated grain at the dose of 25, 50 and 100 mg/kg, respectively. The duration would last for 3 months.General situation and weight were observed. At the same time, the arsenic contents of urine, hair, liver and kidney of the rats in each group were detected, as well as the histopathology changes of liver and kidney, and the ultra structure of liver was observed.RESULTS: The arsenic contents of urine (median(min-max)) of the rats in the arsenic water group, low, medium and high arsenic grain groups were separately 3055.59 (722.43-6389.05), 635.96(367.85-1551.31), 1453.84 (593.27-5302.94) and 3101.11 (666.64-6858.61) µg/g Cr; while the arsenic contents of hair of the rats in the above groups were separately (23.07 ± 10.38), (8.87 ± 3.31), (12.43 ± 6.65) and (25.68 ± 7.16) µg/g; the arsenic contents of liver of the rats in the above groups were separately (5.68 ± 3.13), (2.64 ± 1.52), (3.89 ± 1.76) and (5.34 ± 2.78) µg/g; and the arsenic contents of kidney were separately (6.90 ± 1.94), (3.48 ± 1.96), (5.03 ± 2.08) and (7.02 ± 1.62) µg/g; which were all significantly higher than those in the control group (86.70 (49.71-106.104) µg/g Cr,(1.28 ± 0.37) µg/g, (1.01 ± 0.34) µg/g and (1.82 ± 1.09) µg/g, respectively). The difference showed significance (P < 0.05). Under electron microscope detection, we observed the reduction of mitochondrial, the blurred mitochondrial cristae, some disappeared ridges, the reduced rough endoplasmic reticulum, and irregular uneven nuclear in the liver cells of rats in arsenic contaminated grain group. The contents of aspartate transaminase (AST) and total bile acid (TBA) in medium and high arsenic contaminated grain group were respectively (196.17 ± 46.18), (212.40 ± 35.14) U/L and (11.74 ± 4.07), (19.19 ± 4.68)µmol/L, which were higher than it in the control group (separately (143.10 ± 29.13) U/L and (6.23 ± 2.95)µmol/L). The contents of glutathione-S-transferases(GST), γ-glutamyltranspeptidase (GGT)and blood urea nitrogen (BUN)in high arsenic contaminated grain group were separately (196.21 ± 47.38)U/L, (1.71 ± 0.66)U/L, (9.54 ± 1.95)mmol/L, which were higher than that in the control group ((134.93 ± 24.80 )U/L, (0.75 ± 0.36)U/L, (7.67 ± 1.02)mmol/L, respectively). The contents of cholinesterase (CHE) in low, medium and high arsenic contaminated grain group were separately (259.90 ± 52.71)U/L, (263.44 ± 66.06)U/L and (244.90 ± 36.14)U/L, the contents of total protein(TP) in rats of high arsenic contaminated grain group were (62.64 ± 5.50)g/L, which was all lower than that in the control group ((448.33 ± 59.67)U/L, (69.38 ± 4.24)g/L, respectively). The contents of TBA in high arsenic contaminated grain group ( (19.19 ± 4.68) µmol/L) was higher than that in drinking water arsenic poisoning group ((15.15 ± 2.64)µmol/L). The differences of the above indexes were all significant (P < 0.05).CONCLUSION: The results showed the arsenic poisoning rat model produced by coal-burning were successfully established.

Hong F.,Guiyang Medical University
Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine] | Year: 2013

OBJECTIVE: To observe the chronic combined effects of sodium fluoride and sodium arsenite on the Runx2 and downstream related factors of bone metabolism in SD rats.METHODS: SD rats were divided randomly into nine groups of 6 each by factorial experimental design (half female and half male) , and supplied with the different doses of fluoride, arsenite and fluoride plus arsenite containing in deionized water (untreated control containing 0 mg/kg fluoride and 0 mg/kg arsenite, and low-fluoride and high supplemented with 5 and 20 mg/kg fluoride, and low-arsenite and high supplemented with 2.5 and 10 mg/kg arsenite, and low-fluoride plus low-arsenite, and low-fluoride plus high-arsenite, and high-fluoride plus low-arsenite, and high-fluoride plus high-arsenite, respectively) . After 6 months exposure, the concentration of Runx2, matrix metallopeptidase 9 (MMP-9) ,Osterix, Receptor activator for nuclear factor-κ β ligand (RANKL) were detected by enzyme-linked immunosorbent assay method, respectively.RESULTS: There were no dental fluorosis found in the control group, low-arsenic group and high-arsenic group. There were significant differences in the constituent ratio of dental fluorosis among the rats from low-fluoride and high-fluoride (that is 5 rats out of 6 and 6 rats out of 6) compared with the control group (0 rat out of 6) (χ(2) = 8.57, 12.00, P < 0.05). The bone fluorine level increased with the increase of fluoride dose, the groups without fluoride supply (control group, low-arsenite and high-arsenite group's geometric mean (minimum-maximum) were 0.005 (0.003-0.009), 0.006 (0.003-0.021), 0.003 (0.002-0.100) mg/g, respectively), low-fluorine groups (low-fluoride group, low-fluoride plus low-arsenite, and low-fluoride plus high-arsenite group were 3.395 (2.416-5.871), 3.809 (1.471-7.799), 1.471 (1.473-6.732)mg/g, respectively) , the high-fluorine groups (high-fluoride, high-fluoride plus low-arsenite, and high-fluoride plus high-arsenite group were 70.086 (46.183-131.927), 69.925 (40.503-96.183), 40.503 (52.622-89.487) mg/g, respectively) and the differences between groups was significant (P < 0.05). The bone arsenic level increased with the increase of arsenite dose. The low-arsenic groups (low-arsenite group, low-arsenite plus low-fluoride, and low-arsenite plus high-fluoride group were 7.195 (5.060-9.860), 6.518 (2.960-12.130), 6.970 (3.400-9.730) µg/g, respectively), the high-arsenic groups (high-arsenite, high-arsenite plus low-fluoride, and high-fluoride plus high-arsenite group's geometric mean(minimum-maximum) were 8.823 (5.760-10.840), 9.470 (7.230-12.860), 8.321 (2.420-17.540) µg/g, respectively) were significantly higher than that in the groups without arsenic supply (control group, low-fluoride and high-fluoride group were 1.785 (0.300-3.750), 2.226 (1.410-3.980), 2.030 (1.040-3.850)µg/g, respectively) (P < 0.05). There was no significant difference of the bone arsenic concentration between low-arsenic and high arsenic group. There was significant positive correlation between fluoride concentration and Runx2, MMP-9, Osterix, RANKL level (the correlation coefficient was 0.647, 0.354, 0.582, 0.613 between fluorine gavage concentration and protein level, the correlation coefficient was 0.559,0.387, 0.487, 0.525 between bone fluorine concentration and protein level, respectively, P < 0.01). There was negative correlation between arsenite gavage concentration with Runx2 level (r = -0.527, P < 0.05) and was no correlation between arsenite gavage concentration with MMP-9, RANKL,Osterix level (P > 0.05). There was interaction between fluoride and arsenite to Runx2, MMP-9, RANKL,Osterix (F = 3.88, 15.66, 2.92, 6.42, respectively, P = 0.01, <0.01, 0.031, <0.01, respectively).CONCLUSION: The combined effects of fluoride and arsenic on the Runx2, MMP-9, RANKL, Osterix of bone metabolism showed antagonistic effects.

Zhou J.J.,Guiyang Medical University
Nan fang yi ke da xue xue bao = Journal of Southern Medical University | Year: 2011

To study the effects of neuron specific enolase (NSE) gene silencing on the cell proliferation and apoptosis of lung cancer cells in vitro. NSE protein expression was detected in human small cell lung cancer cell line NCI-H446 and non-small cell lung cancer cell line A549 by immunocytochemistry, and a small interference RNA (siRNA) was transfected into the cells to inhibit NSE gene expression. The changes in the cell cycle, apoptosis, Ki67 protein and caspase-3 activity in the transfected cells were observed by flow cytometry, Western blotting and colorimetric assay, respectively. Both A549 and NCI-H446 cells expressed NSE protein. Transfection of siRNA for NSE gene significantly inhibited the expression of NSE gene in the cells, resulting in an inhibition rate exceeding 90%. NSE gene silencing caused significantly decreased cell percentage in S phase and the expression of Ki67 protein, and increased the cell apoptotic rate and caspase-3 activity. NSE gene expression promotes the cell proliferation and inhibits the cell apoptosis in lung cancer cells with neuroendocrine differentiation, which might be a causative factor contributing to increased malignancy of the cells.

Wang Q.,Guiyang Medical University
Zhonghua wei chang wai ke za zhi = Chinese journal of gastrointestinal surgery | Year: 2012

To compare surgical efficacy after three different reconstruction techniques after radical resection of distal gastric cancer. Clinical data of 169 cases of distal gastric cancer operated in our hospital from 2007 to 2010 were retrospectively analyzed. The reconstruction techniques included Billroth I (anastomosis (n=60), Billroth II (anastomosis (n=41), and Roux-en-Y anastomosis (n=68). Efficacy among 3 groups was compared. Specific symptoms scale was used to evaluate the quality of life in three methods after three months. Compared to Billroth I(anastomosis and Billroth II (anastomosis, Roux-en-Y anastomosis had longer operative time [(266.3±70.4) min vs. (196.2±54.3) min, and (228.5±67.7) min], more blood loss [(220.9±67.6) ml vs. (170.5±61.5) ml and (188.5±76.7) ml], and shorter time to gastric tube removal [(2.6±1.5) d vs. (3.1±1.3) d and (3.6±1.2) d], milder postoperative reflux and heartburn sensation(specific symptoms scale, 1.8±0.4 vs. 1.9±0.6 and 2.6±0.4, P<0.05). Although Roux-en-Y anastomosis is not consistent with physiological route and the procedure is more complex to perform, it can effectively prevent reflux complications. Roux-en-Y anastomosis is a better reconstruction technique after radical resection of distal gastric cancer.

Luo W.,Guiyang Medical University
Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery | Year: 2012

To construct a new type of self-assembling peptide nanofiber scaffolds-RGDmx, and to study the cell compatibility of the new scaffolds and the proliferation and chondrogenic differentiation of precartilaginous stem cells (PSCs) in scaffolds. PSCs were separated and purified from newborn Sprague Dawley rats by magnetic activated cell sorting and indentified by immunohistochemistry and immunofluorescent staining. The RGDmx were constructed by mixing KLD-12 and KLD-12-PRG at volume ratio of 1:1. PSCs at passage 3 were seeded into the KLD-12 scaffold (control group) and RGDmx scaffold (experimental group). The proliferation of PSCs in 2 groups were observed with the method of cell counting kit (CCK)-8 after 1, 3, 7, and 14 days after culture. The RGDmx were constructed by mixing KLD-12-PRG and KLD-12 at different volume ratios of 0, 20%, 40%, 60%, 80%, and 100% and the proliferation of PSCs was also observed. The complete chondrogenic medium (CCM) was used to induce chondrogenic differentiation of PSCs in different scaffolds. The differentiation of PSCs was observed by toluidine blue staining and RT-PCR assay. PSCs were separated and purified successfully, which were identified by immunohistochemistry and immunofluorescent staining methods. The results of CCK-8 showed that the absorbance (A) value in the experimental group increased gradually and reached the highest at 7 days; the A value in the experimental group was significantly higher than that in the control group at 7 days and 14 days (P < 0.05). Meanwhile, the A value in the RGDmx scaffold with a volume ratio of 40% was significantly higher than those in others (P < 0.05). After 14 days of induction culture with CCM, the toluidine blue staining results were positive in 2 groups; the results of RT-PCR showed that the expression levels of collagen type II and the aggrecan in the experimental group were significantly higher than those in the control group (P < 0.05). The self-assembling peptide nanofiber scaffold-RGDmx is an ideal scaffold for tissue engineer because it has good cell compatibility and more effective properties of promoting the differentiation of PSCs to chondrocytes.

Chen J.,Guiyang Medical University
Ceramics International | Year: 2015

As one of the most potential negative electrode materials, Na2Ti6O13 is expected to play an important role in the area of high-performance battery. In this work, we have developed an easy, efficient and controllable method to prepare rod-shaped Na2Ti6O13 crystals. This approach utilized a single-source molten salt strategy and only needed to sinter a special precursor synthesized from an aqueous solution containing H3BO3 and (NH4)2TiF6 in presence of sodium salts. The component and shape of precursor crystals can be tuned by adjusting the reagent concentration and reaction temperature. By sintering precursor crystals in air at 900 °C for 30 min, Na2Ti6O13 with high crystallinity and purity can be obtained. X-ray diffraction and scanning electron micrographs results of different sintering times show that the sintering process can be divided into two steps. Firstly, the precursor crystals are converted to TiO2 (anatase) nano-particles and amorphous sodium salts. Subsequently, molten salt reaction occurs between amorphous sodium salts and TiO2 and forms rod-shaped Na2Ti6O13 crystals. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Zhang K.-L.,Guiyang Medical University | Lou D.-D.,Guiyang Medical University | Guan Z.-Z.,Guiyang Medical University
Neurotoxicology and Teratology | Year: 2015

To explore the mechanisms by which chronic fluorosis damages the brain, we determined the levels of the advanced glycation end-products (AGEs), the receptor for AGE (RAGE), NADPH oxidase-2 (NOX2), reactive oxygen species (ROS) and malondialdehyde (MDA) in the brains of rats and/or SH-SY5Y cells exposed to different levels of sodium fluoride (5 or 50ppm in the drinking water for 3 or 6months and in the incubation medium for as long as 48h, respectively). The levels of AGEs, RAGE and NOX2 protein and mRNA were measured by an Elisa assay, Western blotting and real-time PCR, respectively. The ROS content was assessed by fluorescein staining and MDA by thiobarbituric acid-reactive substance assay. In comparison to the unexposed controls, the protein and mRNA levels of AGEs, RAGE and NOX2 in the brains of rats after 6months of exposure and in SH-SY5Y cells following high-dose exposure to fluoride were elevated. In contrast, no significant changes in these parameters were detected in the rats exposed for 3months. In addition, the levels of ROS and MDA in the SH-SY5Y cells exposed to high-dose of fluoride were elevated in a manner that correlated positively with the levels of AGE/RAGE. In conclusion, our present results indicate that excessive fluoride can activate the AGE/RAGE pathway, which might in turn enhance oxidative stress. © 2015 Elsevier Inc.

Objective: To investigate DNA methylation in the promoter region, mRNA transcription and protein expression of glutathione-S-transferases-P1 (GSTP1) gene and their relation with arsenism. Methods: In endemic coal-pollution-borne arsenism area, Jiaole village of Xinren county, Guizhou province, according to the diagnostic criteria of endemic arsenism(WS/T 211-2001), 123 cases with endemic arsenism were selected and divided into three groups (mild arsenism group: 42 cases, moderate arsenism group: 41 cases and severe arsenism group: 40 cases). Forty seven residents were selected as controls in a village about 12 km away from the endemic arsenism area. With the informed consent principle, peripheral blood of all respondents was collected in order to analyze DNA methylation and check mRNA. DNA methylation of GSTP1 gene promoter region in peripheral blood was assayed by PCR, and GSTP1 mRNA expression was assayed using real-time quantitative PCR. In addition, other cutaneous specimens originated from 53 cases with arsenism that accepted surgical treatment voluntarily were taken. Of these specimens, general pathological changes were 28 cases, precancerous 20 cases and cancerous 5 cases. Skin tissues of 15 cases of non-tumor surgery patients without abnormal pathological changes were as control group. GSTP1 protein expression in the skin tissue was detected using immunohistochemistry (IHC). Results: Among different groups of arsenic poisoning, the positive rate of DNA methylation of GSTP1 gene was 28.57%(12/42) in the mild group, 57.10%(23/41) in the moderate group and 65.00%(26/40) in the severe group. Compared with the control group (6.38%,3/47), the difference was statistically significant (χ2 = 7.792, 26.000, 33.412, all P < 0.01). Among different groups of arsenic poisoning diagnosed by dermapathology, the positive rate of DNA methylation of GSTP1 gene was 21.43%(6/28) in the general pathological change group, 50.00%(10/20) in the precancerous group and 80.00%(4/5) in the cancerous group. Compared with the control group(6.67%,1/15), the difference was statistically significant (χ2 = 3.562, 7.468, 10.756, all P < 0.05). It showed that the positive rate of DNA methylation of GSTP1 gene increased with aggravation of the disease and dermatic lesion of arsenism(tendency χ2 = 38.239, χ2.= 13.659, all P < 0.01). Compared with the control group(0.184 26), the expressions of GSTP1 mRNA in peripheral blood in moderate (0.087 77) and severe arsenic poisoning groups(0.056 93) were significantly reduced(all P < 0.01), and that of severe group was significantly lower than that of the moderate group (P < 0.01); compared with the control group (0.338 45) and the general lesion group (0.276 74), GSTP1 mRNA expression was significantly reduced in precancerous lesion group(0.104 81) and cancerous group(0.043 70), in which the cancerous group was significantly lower than that of the precancerous lesions. The difference of skin tissue GSTP1 protein expression rate between groups was statistically significant (χ2 = 20.948, P < 0.05), in which the difference between the precancerous lesion group(65.00%, 13/20), the cancer group (40.00%, 2/5) and the control group (100.00%, 15/15) was statistically significant (χ2 = 12.183, 11.778, P < 0.01). Spearman correlation analysis showed that the degree of skin lesion and the level of GSTP1 protein expression was negatively correlated(r = - 0.520, P < 0.05). Groups were divided according to DNA methylation of GSTP1 gene, and the mRNA and protein expression of GSTP1 in methylation group(0.038 40, 57.14%) was significantly lower compared with that of unmethylated group(0.187 07, 95.74%; Z = 9.032, χ2 = 23.134, all P < 0.01). Conclusions: Arsenism may lead to DNA methylation of human GSTP1 gene promoter region, thereby inhibiting expression of mRNA and protein. GSTP1 gene plays an important role in arsenism or carcinogenic process.

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