Animals ; Disease Models, Animal ; Hypoglycemia ; chemically induced ; metabolism ; Hypothalamus ; drug effects ; metabolism ; Insulin ; pharmacology ; Intracellular Signaling Peptides and Proteins ; metabolism ; Male ; Neuropeptides ; metabolism ; Orexins ; Rats ; Rats, Sprague-Dawley

Objective:The recombinant human retinal pigment epithelium-derived factor(PEDF)protein to be obtained and the angiogenesis of the rPEDF to be identified.Methods: PEDF gene gene was amplified by PCR and cloned into pET32a,rPEDF protein was expressed in E.coli BL21 and confirmed by SDS-PAGE and Western blot.The rPEDF was purified by Ni-NTA on denature condition.The concentration of the rPEDF was determined by Bradford method.The angiogenesis of the rPEDF was determined by chick chorioallantoic membrane(CAM) method.Results: The expression plasmid pET32a-PEDF was constructed successfully.The rPEDF was expressed with stable efficiency in E.coli BL21.The results of the CAM experiment showed that the rPEDF had notable angiogenesis effect in the concentration 0.4、0.04 ng/ml,but had no effect in 4 ng/ml.Conclusion:The PEDF gene was cloned and expressed efficiently,the angiogenesis of the rPEDF to be identified and the activity was worked in certain range.The results can facilitate studying its function and spreading its application.

Background Retinitis pigmentosa (RP)is a common hereditary blinding eye disease in ophthalmology.Current researches documented that RP may have the common pathophysiologic basis to Alzheimer disease and chronic neurodegenerative disease.Understanding this mechanism will offer a new therapeutic target for RP.Objective The purpose of the present study was to investigate the roles of cyclin-dependent kinase 5 (Cdk5)/P25 activation in the apoptosis of retinal neural cells of RCS rats.Methods Eighteen SPF RCS rats and 18 RCS-rdy+ rats were randomized into 17-,25-and 35-day groups respectively and 6 rats for each.The rats were sacrificed at corresponding time points and retinal hemogenete was prepared.Expressions of CdkS,P35,P25 and tau phosphorylation in the retinas were detected by Western blot,and the kinase activity of Cdk5/P25 was analyzed by quantitative colorimetric assay.Results The expressing level of P35 protein(A340) in the retinas of 17-day-old RCS rats was near that of 17-day-old RCS-rdy+ rats(t =0.52,P＞0.05).In 25-and 35-day-old RCS rats,the expressing levels of P35 protein were 2.20±0.48 and 1.23±0.14,which were higher than those of RCS-rdy+ rats(1.43±0.13 and 0.93±0.10),showing significant differences between them(t =3.78,4.28,P＜0.05).The expression of P25 was undetectable at postnatal 17 days in RCS rats and RCS-rdy+ rats,but it showed significantly higher in RCS rats(0.300±0.003 and 0.230±0.004) than that in RCS-rdy+ rats(0.040±0.004 and 0.070±0.004) at postnatal 25 days and 35 days(t=121.81,77.51,P＜0.01).No significant difference was found in the expression of Cdk5 in RCS rats and RCS-rdy+ rats at different ages (t =-0.60,0.19,1.62,P＞ 0.05).The kinase activity of Cdk5/P25 did not show significantly different between RCS and RCS-rdy+ rats at postnatal 17 days(t =0.19,P＞0.05),but significantly higher kinase activity of Cdk5/P25 was seen in RCS rats (0.0058 ±0.0005 and 0.0056±0.0004) than that in RCS-rdy+ rats(0.0038±0.0003 and 0.0032 ±0.0007) at postnatal 25 days and 35 days (t =8.07,5.97,P＜ 0.01).No expression of tau phosphorylation was detected in RCS rats at postnatal 17 days,but significantly higher tau phosphorylation level was seen in RCS rats at postnatal 25 days and 35 days(1.80±0.22 and 1.23±0.17),which were significant different in comparison with RCS-rdy+ rats at postnatal 25 days and 35 days(1.60 ±0.20 and 1.04 ±0.12)(t=4.71,3.17,P＜0.05).Conclusions The Cdk5/P25 kinase activity shows a consistent trend with theexpressions of P25 and tau phosphorylation in the RCS rats,indicating that the upregulation of P25 induces the enhance of enzyme activity of Cdk5,which phosphorylate its substrates to result in more apoptosis of retinal neural cells.

OBJECTIVETo investigate the protective effects of oxymatrine on chronic heart failure induced by isoproterenol (ISO) and to observe its effects on ADMA metabolism pathway in ISO-induced chronic heart failure in rats.

METHODMale Sprague-Dawley rats were given oxymatrine (100,50 mg kg-1) orally for 14 days. Heart failure was induced in rats by subcutaneous injection of isoproterenol (5 mg kg-1 d-1 ) at the 8th day for 1 week. Serum parameters, haemodynamic parameters, Heart weight, and histopathological variables were analysed. Expression of protein levels were measured by Western blot.

RESULTOxymatrine (100,50 mg kg-1) significantly attenuated serum content of cTn I, improved left ventricle systolic and diastolic function and left ventricular remodeling, reduced the ISO-induced myocardial pathological changes compared with ISO group. In addition, oxymatrine (100,50 mg kg-1) significantly reduced serum level of ADMA (P <0. 01), normalize the reduced dimethylarginine dimethylaminohydrolase 2 (DDAH2) expression (P <0. 01) , but had no effect on the isoproterenol-induced upregulated protein arginine methyltransferases 1 expression.

CONCLUSIONOxymatrine could ameliorate the experimental ventricular remodeling in ISO-induced chronic heart failure in rats and the mechanism involved in reducing serum content of ADMA and increased DDAH2 expression.

Alkaloids ; pharmacology ; therapeutic use ; Amidohydrolases ; metabolism ; Animals ; Arginine ; analogs & derivatives ; blood ; metabolism ; Chronic Disease ; Gene Expression Regulation, Enzymologic ; drug effects ; Heart Failure ; drug therapy ; metabolism ; pathology ; physiopathology ; Hemodynamics ; drug effects ; Isoproterenol ; adverse effects ; Male ; Organ Size ; drug effects ; Quinolizines ; pharmacology ; therapeutic use ; Rats ; Rats, Sprague-Dawley ; Troponin I ; metabolism

OBJECTIVETo study whether N, N'-di-(m-methylphenyi)-3,6-dimethyl-1,4-dihydro-1,2,4,5-tetrazine-1,4-dicarboamide (ZGDHu-1) inhibits proliferation and induces apoptosis in human lung carcinoma cell line EBC-1 cells and its molecular mechanism.

METHODSDifferent concentrations of ZGDHu-1 and different times of culture were used to treat EBC-1 cells in vitro. The inhibition of proliferation was measured by BrdU-ELISA. Cell apoptosis was detected by Annexin V/PI staining and cellular DNA fragmentation ELISA. Phosphorylated p38MAPK and STAT3 were examined by flow cytometry. The protein expressions of bcl-2, bax, p53, Fas, and caspase-3 were detected by Western blot analysis.

RESULTSZGDHu-1 inhibited EBC-1 cell proliferation within a certain range of treating times and does, with a 24 h IC(50) of (295 ± 25) ng/ml, 48 h of (112 ± 8) ng/ml and 72 h of (23 ± 2) ng/ml. The EBC-1 cell apoptosis was confirmed by Annexin V/PI labeling and cellular DNA fragmentation ELISA in a dose-related manner. When EBC-1 cells were treated with 50, 200, and 500 ng/ml ZGDHu-1 for 48 h, the expression rates of phosphor-p38MAPK protein were 67.4%, 88.2%, 91.1%, respectively, and that of the control was 10.6%. That of STAT3 protein were 56.5%, 43.6% and 34.6%, respectively, and that of the control was 89.1%. The expression of bax, p53 and Fas protein was significantly increased, that of bcl-2 was not changed, and that of caspase-3 was significantly decreased by the ZGDHu-1 treatment.

CONCLUSIONZGDHu-1 can inhibit proliferation and induce apoptosis in EBC-1 cells. The mitochondrial pathway mediated by Fas may be one of its mechanisms. The apoptosis of EBC-1 cells may associate with up-regulation of phosphor-p38MAPK and down-regulation of phosphor-STAT3 in the cells.

Apoptosis ; drug effects ; Carcinoma, Squamous Cell ; metabolism ; pathology ; Caspase 3 ; metabolism ; Cell Line, Tumor ; Cell Proliferation ; drug effects ; DNA Fragmentation ; Heterocyclic Compounds, 1-Ring ; administration & dosage ; pharmacology ; Humans ; Lung Neoplasms ; metabolism ; pathology ; Proto-Oncogene Proteins c-bcl-2 ; metabolism ; STAT3 Transcription Factor ; metabolism ; Tumor Suppressor Protein p53 ; metabolism ; bcl-2-Associated X Protein ; metabolism ; fas Receptor ; metabolism ; p38 Mitogen-Activated Protein Kinases ; metabolism

BACKGROUND: With the development of 3D printing technology, organ and tissue construction can be achieved by constructing a three-dimensional scaffold that is conducive to cell growth. OBJECTIVE: To solve the scaffold over-accumulation during 3D printing.METHODS: Fluent, a finite element analysis software developed by ANSYS Company in the United States, was used to analyze the extrusion process of print heads and to obtain suitable viscosity and extrusion pressure of materials for the 3D printing of cellulose gel composites. We then compared simulation results with experimental results. RESULTS AND CONCLUSION: The error between simulation results and experimental results was less than 5%. The simulated values at a kinetic viscosity of 45 and a pressure of 0.10-0.12 MPa solved the phenomenon of over-accumulation of cellulose gel composites during the 3D printing process, ensuring enough space for the 3D printed scaffold.

Background Keratoconus is a bilateral,noninflammatory,gradually progressive corneal disorder characterized by progressive thinning and steepening of the central cornea.It is significant to investigate keratoconusrelated pathogenic gene for elaborating the pathogenesis and establishing early diagnosis standard and taking clinical measurement.Objective The aim of the study was to explore the relationship of visual system homeobox gene (VSX1) polymorphism and the risk of sporadic keratoconus.Methods This study was approved by Ethic Commission of First Hospital of Xi' an.Written informed consent was obtained from each subject prior to enrollment.A case-controlled study was conducted.One hundred and one Han nationality patients with sporadic keratoconus were included in this study.These keratoconus patients were clinically diagnosed by slit lamp examination and corneal tomography.Single nucleolide polymorphism (SNP) of VSX1 gene was assayed and classified using the MassARRAY SNP technique.Demography and relevant risk factors were collected from each subject by questionnaire.Eighty healthy volunteers served as controls.Chi-square test and Binary logistic regression were used to evaluate the difference in the distribution of allele frequency and genotype frequency and to analyze the association with keratoconus risks.Results SNP of two genes was found in the Chinese Han population (rs743018 (c.843+140 C＞T) and rs6138482(R217H C＞T)).There were no significant differences in the genotype frequency and allele frequency of the SNP of two genes in the keratoconus group in comparison with the normal control group (P＞0.05).After adjustment by age and sex,SNP of two genes was not significantly associated with the risk of keratoconus (regression model:rs743018 (C＞T) adjusted:P=0.35,OR=0.72,95％ CI:0.37-1.43 ;rs6138482 (C＞T) adjusted:P =0.48,OR=0.76,95％ CI:0.35-1.64).Conclusions Gene polymorphisms of rs743018(c.843+140 C＞T) and rs6138482(R217H C＞T) in the Chinese Han population is not associated with the risk of keratoconus.Due to the racial difference in genotype and allele frequency,the role of the VSX1 gene in the pathogenesis of keratoconus still remains controversial,and further study needs to be developed.

Background Retinitis pigmentosa (RP) is a monogenic inheritance and blinding disease of fundus oculi.There is not an effective therapeutic method now.Objective This work was to identify the mutations of RP1 gene in Chinese RP patients in Ningxia area and to explore the potential interactions in the pathogenesis of RP.Methods The periphery blood of 3-5 ml was collected from 110 individuals with RP(35 ADRP and 75SRP)and 100 normal controls in Ningxia area.Polymerase chain reaction (PCR) and direct DNA sequencing were used to screening the sequence alterations in the entire coding region and splice sites of RP1 gene.Multivariate analysis and two web-based programs( PolyPhen and SIFT) were used to analyze the results.Results Eleven mutation locus were detected in the exon 4 of RP1 gene including two novel sequence variants:p.Lys1152Lys without a higher mutation rate in comparison with normal control group(x2 =9.12 P＜0.01 ),but c.* 247A＞C with a higher mutation rate in comparison with normal control group(x2 =12.77,P＜0.01 ) and c.* 247A＞C mutation was thought to be correlated with RP( r=1.11,P＜0.05 ).The other ten mutation locus were reported as single nucleotide polymorphisms (SNP).The mutation rate of p.Gln1725Gln was found to be higher in the RP patients than the normal controls (x2 =42.09,P＜0.01 ),but no the significant correlation was seen between the pathogenesis of RP and mutation of p.Gln1725Gln(r=1.74,P＞0.05).p.Lys1152Lys mutation was found in only 1 patient.Three SNPs( p.Arg872His,Ala1670Thr,Ser1691Pro) were always occurred in the same 83 RP patient and the relevance ratio was higher than controls ( P＜0.01 ).The age of night blindness on patients with concurrent three mutations was (30.54± 13.68 ) years,and the best corrected visual acuity (BCVA) was 0.50 ± 0.38.The age of night blindness on patients without concurrent three mutations was(21.06± 16.24) years,and the BCVA was 0.40 ±0.33 and were higher than controls ( t =2.11,P ＜ 0.05 ).Conclusions In this study,the prevalence of RP1 mutations among the RP patients in Ningxia population was lower than other populations (＜ 1％ ).The alliance of SNPs (p.Arg872His、p.Ala1670Thr、p.Ser1691Pro) may play a protective role on RP patients and reduce the frequency of mutatiaon in RP1 gene.

Objective To investigate the protective mechanism of insulin on paraquat-induced PC12 cells. Methods Based on the Part (insulin can protect the paraquat-induced PC12 cells), immunoprecipitation and Western blotting were employed to observe the protein expressions of INR Tyr~(1162/1163) and AktSer~(473) in the group of normal PC12 cells, group of insulin interfered PC12 cells, group of PQ-induced PC12 cells and group of PQ combined with insulin interfered PC12 cells, respectively. Results Group of insulin interfered PCI2 cells and group of PQ combined with insulin interfered PC12 cells showed expression of phosphorylation protein INR Tyr~(1162/1163), while the other groups without insulin intervention did not show the expression of that. The expression of phosphorylation protein INR Tyr~(1162/1163) in the group of insulin interfered PC12 cells was higher than that in the group of PQ combined with insulin interfered PC12 cells, but statistical analysis showed no significant difference between the 2 groups (P>0.05). Meanwhile, the expression of phosphorylation protein AktSer~(473) in the group of insulin interfered PC 12 cells was obviously higher than that in the group of PQ combined with insulin interfered PC12 cells (P<0.05). Conclusion The increased expression of phosphorylation protein INR Tyr~(1162/1163) and AktSer~(473) might be one of the clues in proving that insulin may have the protective effect on PC12 cells.

The present study was aimed to analyze the immunogenicity of recombinant human zona pellucida-3 peptides (r-huZP3a(22 approximately 176) and r-huZP3b(177 approximately 348)) expressed in E. coli through immunizing rabbits, and to evaluate the efficacy of their polyclonal antisera against r-huZP3a(22 approximately 176) and r-huZP3b(177 approximately 348) to inhibit in vitro human sperm-egg binding respectively. Male New Zealand rabbits were immunized using r-huZP3a(22 approximately 176) or r-huZP3b(177 approximately 348) as antigen respectively, which was purified through an improved method of preparative gel polyacryulamide gel electrophoresis. The antibody response level of r-huZP3a(22 approximately 176) or r-huZP3b(177 approximately 348) immunogen in rabbits was determined by ELISA using mouse ZP3-5 (amino acid sequence(137 approximately 150) being completely conserved with huZP3(138 approximately 151) sequence) and specific huZP3-14 (amino acid sequence(327 approximately 340)) synthetic peptides as coating antigens respectively. The immunoreactivity and specificity of the anti-r-huZP3a(22 approximately 176) and anti-r-huZP3b(177 approximately 348) antisera with each r-huZP3 peptides, were tested by immunoblot and immunohistochemistry (using native huZP and human ovary section) respectively. A competitive hemizona assay (HZA) was used to evaluate the efficacy of the antisera against r-huZP3a(22 approximately 176) and r-huZP3b(177 approximately 348) to inhibit in vitro human sperm-egg binding. Both r-huZP3 peptides were able to induce higher antibody titers in rabbits. Each antiserum could specifically recognize or bind to each target r-huZP3 peptide expressed in E. coli and native human ZP in vitro. The antisera also inhibited sperm-egg binding in the HZA. These results show that r-huZP3a(22 approximately 176) and r-huZP3b(177 approximately 348) are of strong immunogenicity. They can be used to develop a kit for detecting whether there are autoantibodies to zona pellucida in unexplained infertile women, and their antisera might be useful tools for determining minimal B-cell epitope sequences of several known huZP3 epitope peptides.
Animals ; Egg Proteins ; biosynthesis ; genetics ; immunology ; Escherichia coli ; genetics ; metabolism ; Female ; Humans ; Immune Sera ; immunology ; Immunization ; Male ; Membrane Glycoproteins ; biosynthesis ; genetics ; immunology ; Rabbits ; Receptors, Cell Surface ; biosynthesis ; genetics ; immunology ; Recombinant Proteins ; biosynthesis ; genetics ; immunology ; Sperm-Ovum Interactions ; immunology ; Zona Pellucida Glycoproteins