Association of small ubiquitin-like modifer 4 gene A/G163 polymorphism with genetic susceptibility in Chinese children with type 1 diabetesZONG Wei, SANG Yan-mei, LIU Min, YAN Jie
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.007
ObjectiveTo investigate the association of small ubiquitin-like modifer 4 (SUMO4) gene polymorphism in Chinese children with type 1 diabetes.
MethodsA total of 165 Chinese children with type 1 diabetes were selected from Beijing Children′s Hospital, all meeting with 1999 WHO diagnostic criteria.One hundred sixty healthy adult blood donors were selected as normal controls. Saturated salting-out method technique was used to extract genomic DNA from peripheral white blood cells, then PCR-RFLP techniques were used to determine SUMO4 A/G163 polymorphism in patients and controls.
ResultThe frequency of SUMO4 G163 allele was significantly increased in type 1 diabetes patients (38.2% vs healthy control subjects 28.7%, P<0.05,OR=1.51, 95%CI 1.03-2.13), the differences of SUMO4 A/G163 genotypes GG in patients and controls had statistical significance (17% vs healthy control subjects 8%, P<0.05). According to different clinical status such as residual islet function, onset age, gender of patients, course of disease onset, ketosis-onset-situations, and so on, the patients were divided into different groups and the difference of SUMO4 A/G163 alleles in different groups showed no statistical significance (P>0.05).
ConclusionsSUMO4 gene A/G163 polymorphism is related to genetic susceptibility of type 1 diabetes in Chinese children. But it has no relationship with different clinical status on diagnosis of type 1 diabetes.
Cloning, expression and diagnostic application for type 1 diabetes mellitus of human glutamic acid decarboxylase 65 geneSONG Xiao-guo, ZHANG He-qiu, WANG Guo-hua, CHU Xiao-yan, LIU Xi-ming, CHEN Kun, ZHU Cui-xia, DAI Zhen-hua, FANG Ping, FENG Xiao-yan
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.008
ObjectiveTo obtain different fragments of human glutamic acid decarboxylase 65 and to evaluate the diagnostic application for type 1 diabetes mellitus of the recombination human glutamic acid decarboxylase 65.
MethodsThe coding gene of the glutamic acid decarboxylase 65 was obtained by RT-PCR. The corresponding prokaryotic expression vectors pBVIL1/GAD65 were constructed and transformed into E. coli HB101 to inducing the expression of the recombination human glutamic acid decarboxylase 65. Using these antigen fragments as the coating antigens, the enzyme-linked immunosorbent assay (ELISA) was established for the detection of the glutamic acid decarboxylase autoantibody.
ResultsThe obtained four fragments of human glutamic acid decarboxylase 65 could react with the serum of type 1 diabetes mellitus patients. Because the specificity of the fragment of GAD65(180-585) was the highest and the detection rate of this fragment was 55.3%, the fragment of GAD65(180-585) became the preferred antigen.
ConclusionBecause of the favourable antigenicity of the selected recombination human GAD65(180-585), the GAD65(180-585) could be the candidate antigen for developing the diagnostic reagent for type 1 diabetes mellitus.
Genetic variations of miR-541 exist in type 1 diabetes childrenHAN Bei, SHI Xing, SUN Wen, PENG Quan, GAO Wen-tao
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.009
ObjectiveTo screen whether microRNA miR-541 has T1DM associated genetic variation.
MethodsFrom January 2006 to August 2009, sixty-nine type 1 diabetes children (T1DM group) and 46 healthy volunteers (control group) were selected in Nanjing Children Hospital of Nanjing Medical University. PCR amplification and direct sequencing were used to screen genetic variations within -1084~+ 167 region of pre-miR-541 gene. RFLP and RNA fold were used for the candidate genetic variation.
ResultsOne SNP database reported SNP (rs12893725) and three unreported genetic variation were found. Two of them (-284 heterogeneous C→T and -569 heterogeneous G→A) were found in both diabetes patients and healthy volunteers, there were no significant difference for their genetic frequency and clinical parameters between T1DM and control group. But 1 genetic variation (-404 heterogeneous G→T) was found only in 3 diabetes children. Then RFLP was used in additional 105 healthy volunteers. The genetic frequency was significant different between T1DM(3/69)and healthy volunteers 1/(105+ 46). In addition, -404G→T variation was found by the second structure analyzing webserver RNAfold could alter the second structure of pre-miR-541 significantly, which may influence its processing and transcription.
ConclusionThere are genetic variations in microRNA miR-541 and -404 G→T is potential T1DM associated genetic variation.
The ankle-brachial index and its association with diabetic foot in type 2 diabetic outpatients with positive lower extremity symptomsLIU Fang, ZENG Hui, SHEN Juan, ZHAO Jun-gong, ZHAO Jun, BAO Yu-qian, JIA Wei-ping
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.010
ObjectiveTo screen the prevalence of lower extremity artery disease (LEAD) in diabetic outpatients through examining the ankle-brachial index(ABI), and investigate its relationship with diabetic foot.
MethodsABI was determined by Nicolet ultrasonography and quantitative sensation tester in 1010 type 2 diabetic outpatients with positive symptom of lower extremity, and clinical characterristics such as BMI, plasma glucose, HbA1c, glycolated albumin(GA) and blood pressure were collected. Patients were divided into five groups based on ABI, ABI >1.3 as group A( n=35), 0.91-1.3 as group B(n=708), 0.71-0.9 as group C(n=118), 0.41-0.7 as group D(n=115), and ≤0.4 as group E(n=34), their clinical features were compared, and the correlation and Logistic regression analysis of ABI were performed.
ResultsTotal ABI of these 1010 diabetics were 0.95±0.23(0.01-2.08), and the prevalence of LEAD was 26.44%(267/1010) diagnosed by ABI<0.9, and another 3.5%(35/1010)with ABI>1.3. Eighty three cases (8.02%) were diagnosed as foot disease including 50 cases of ulcer(4.95%), 13 cases of gangrene (1.29%), 20 cases of infection(1.98%). The correlation analysis inolicated that ABI was associated negatively with age, SBP, duration, HbA1c and GA, and ther value was -0.201, -0.113, -0.171, -0.160, -0.137, respectively. The Logistic regression analysis revealed that ABI was independent risk factors of foot problem (t=6.805, P=0.00).
ConclusionsThe prevalence of lower extremity artery disease and diabetic foot is 26.4% and 8.02% in type 2 diabetes outpatients with symptoms, respectively. Age, diabetic duration, and glucose control are key risk factors of ABI. The reduction of ABI is associated nearly with the onset of diabetic foot.
Correlation of glycosylated hemoglobin and blood glucose levels of impaired glucose regulationMENG Zuo-long, LI Kun-shan, FANG Ying, ZHOU Ying, ZHAO Yan, HAN Yue-xiang, WANG Xiao-min
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.011
ObjectiveTo investigate the correlation of glycosylated hemoglobin (HbA1c) and impaired glucose regulation(IGR).
MethodsSeventy-five g oral glucose tolerance test(OGTT)and HbA1c levels were carried out among our hospital staffs. The subjects were determined fasting plasma glucose(FPG), oral glucose 2 h plasma glucose(2 h PG)and HbA1c, plasma glucose levels and HbA1c levels were determined by glucose oxidase method and high performance liquid chromatogram(HPLC). The inclusion criteria of subjects was FPG<7.0 mmol/L and 2 h PG<11.1 mmol/L, without diabetes, hemoglobin disease, hepatopathy and renopathy. The selected object contained 726 subjects (197 male, 529 female, mean age (39±10)), including NGT 636 subjects(87.6%), IGR 90 subjects(12.4%). The diagnostic criteria of IGR selected 1999 WHO diagnostic criteria for diabetes.χ2 test was used for rate comparison. Pearson correlation analysis was used for bivariate analysis selected.
Results(1)2.3% occurred IGR among HbA1c≤5.7% subjects, while 89.3% occurred IGR among HbA1c≥5.8% subjects. When HbA1c ≥ 5.8%, the sensibility, specificity, PV+ , and PV-were 83%, 99%, 0.89, 0.98, respectively. (2)Between HbA1c level 5.8% group and HbA1c 5.7% group, the difference of prevalence of the OGTT diagnosed IFG, IGT, IGR had statistically significance(χ2 value was 10.077, 22.219 and 27.780, P<0.01 orP<0.001), (3)HbA1c levels was significant positive correlation with the prevalence of IFG, IGT, IGR(r ralue was 0.957, 0.928 and 0.936, all P<0.01).
Conclusions(1)Compared with OGTT, HbA1c had consistency for predicting IGR, and the optimal critical value of HbA1c with OGTT diagnosed IGR was 5.8%.(2)HbA1c levels was significant positive correlation with the blood sugar level of the OGTT diagnosed IFG, IGT, IGR, and when HbA1c=5.8%, its relevance is most closely. The present study suggests that the HbA1c≥5.8% patients should be examined OGTT in order to identify whether the IGR.
Effects of early insulin therapy on sterol regulatory element binding protein-1c in skeletal muscle of diabetic ratsBI Yan, SUN Wei-ping, CAI Meng-yin, LIANG Hua, ZHU Yan-hua, CHEN Xiang, LI Ming, WENG Jian-ping
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.012
ObjectiveTo investigate the effect of early insulin treatment on sterol regulatory elementbinding protein-1c (SREBP-1c) in skeletal muscle of diabetic rats.
Methods24 male Sprague-Dawley rats were randomly assigned into 4 groups of 6 animals each: normal control, untreated diabetic rats, diabetic rats treated with NPH insulin, or diabetic rats treated with gliclazide. Sterol regulatory element-binding protein 1c (SREBP-1c) messenger RNA (mRNA) expression, protein expressions of SREBP-1c, tumor necrosis factor-α (TNF-α), Tyr705 phosphorylation of signal transducer and activator of transcription 3 (p-STAT3) in skeletal muscle of diabetic rats were assayed by Western blot and real time PCR.
ResultsCompared to normal rats, untreated diabetic rats had higher SREBP-1c mRNA (7.3±2.6) and nuclear protein expressions(3.3±0.4), tumor necrosis factor α (TNF-α) (0.44±0.03), and Tyr705 phosphorylation of signal transducer and activator of transcription 3 (STAT3) (0.50±0.08), which all were downregulated following insulin treatment (SREBP-1c mRNA: 4.1±1.8, SREBP-1c nuclear protein: 2.7±0.3, TNF-α: 0.19±0.22, p-STAT3: 0.29±0.03, P<0.05 for all).
ConclusionEarly insulin exerts its anti-lipotoxicity effect in skeletal muscle of diabetic rats potentially through amelioration of inhibition of lipogenesis.
Effects of combined treatment with panax notoginseng saponins and aminoguanidine on oxidative stress in kidney of diabetic ratsXU Gang, LIU Mao-lin, FU Zhen-chun, FAN Chao-ming, HUANG Miao-zhen, LAI Deng-pan, NING Li, ZHANG Qiu-ling
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.013
ObjectiveTo investigate the effect of combined treatment with panax notoginseng saponins (PNS) and aminoguanidine (AG) on oxidative stress in kidney of diabetic rats as well as possible mechanism.
MethodsThe rat diabetic model was induced by intraperitoneal injection of STZ in the left lower abdomen of the rats. A total of 48 model rats were randomly divided into diabetic group (n=12), PNS treatment group (n=12), AG treatment group (n=12), and PNS+ AG treatment group (n=12). Another 12 rats were used as normal controls. Serum and renal cortex superoxide dismutase (SOD) and malondialdehyde (MDA) were measured by colorimetric assay. Advanced glycation end products (AGEs) were determined by spectrum law of fluorescence in the 4 and 8 weeks. The mean glomerular area (MGA) and mean glomerular volume (MGV) were measured by image analysis system. The changes of the blood glucose levels, urine amount, urine albumen, the renal function, body weight (BW), kidney weight (KW) and KW to BW ratio were observed.
ResultsIn comparison with the diabetic group, AGEs(F=36.017, P<0.01;F=8.213, P<0.01) and MDA(F=8.683, P<0.01;F=14.615, P<0.01) in serum and renal cortex, creatinine clearance rate (F=7.233, P<0.01), MGA(F=24.317, P<0.01), MGV(F=26.145, P<0.01), urinary excretion of protein(F=17.108, P<0.05), KW(F=5.182, P<0.05) and KW to BW ratio(F=50.169, P<0.01) were decreased significantly in the PNS+ AG treatment group , and SOD(F=6.260, P<0.01;F=7.666, P<0.01)in serum and renal cortex and BW were increased significantly (F=10.449, P<0.05). Decreased serum MDA was observed in PNS+ AG treatment group compared with AG treatment group(F=8.683, P<0.05), although renal cortex MDA was significantly lower than that of PNS treatment group and AG treatment group(F=14.615, P<0.05). Serum AGEs was decreased significantly in PNS+ AG treatment group compared with AG or PNS treatment group (F=36.017, P<0.01 or ﹤0.05), and renal cortex AGEs was significantly lower than that of AG or PNS treatment group(F=8.213, P<0.05). At 8 weeks, lower MGA(F=24.317, P<0.05)and MGV(F=26.145, P<0.05)were found in the PNS+ AG treatment group.
ConclusionCombined treatment with PNS and AG may possess renoprotective effect on STZ-induced diabetic rats, and the possible mechanism could be associated with reduced oxidative stress and inhibited overproduction of AGEs in renal tissue.
Effects of free fatty acids on apoptosis of human umbilical vein endothelial cell by RNA interferenceYOU Ting-ting, CHEN Gang, LIN Xu, QIAO Yu-fang, LIN Li-xiang
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.014
ObjectiveTo study the role of Wnt/β-catenin signal pathway in high free fatty acid (FFA)-induced apoptosis in human umbilical vein endothelial cell (HUVEC) by RNA interference (RNAi).
MethodsA recombinant adenovirus containing an RNAi cassette targeting the GSK-3β gene was produced and its silencing effect on GSK-3β gene was detected by Western blot analysis in HUVECs. The effect of the RNAi on the protein level of β-catenin was explored by transfecting the RNAi adenovirus to inhibit the expression of GSK-3β protein. The subsequent effect on the Wnt/GSK-3β/β-catenin signal pathway and on apoptosis of HUVECs cultured with FFAs was analyzed by the flow cytometer and Hoechst 33258 in order to explore the possible connection between the signaling pathway and FFA-induced apoptosis. The experimental cells were divided into four groups as followed: 0.75 mmol/L FFA group; RNAi adenovirus (Ad-640)+ FFA group; RNAi adenovirus without recombination (Ad-DEST)+ FFA group; normal cell group.
ResultsThe Western blot results showed that the expression of GSK-3β protein in HUVECs was inhibited by the RNAi adenovirus and the protein level of β-catenin was increased by RNAi adenovirus transfection. Apoptosis was observed in HUVECs exposed to 0.75 mmol/L FFAs for 72 h. The apoptotic rate of the Ad-640+ FFA group was significantly reduced with respect to that of the Ad-DEST+ FFA and FFA groups whereas there was no significant difference between the Ad-DEST+ FFA and FFA groups.
ConclusionRNAi adenovirus specific to GSK-3β may partly protect HUVECs from apoptosis induced by FFAs.
G-protein-coupled receptor 40 mediates the effects of free fatty acid on proliferation in mouse islet beta-cell line NIT-1ZHANG Ying, LUO Zhao-fan, ZHAO Hong-li, XU Ming-tong, LIANG Wei-wen, CHENG Hua
Chinese Journal of Diabetes MellitusVol.02,No.012010
DOI: 10.3760/cma.j.issn.1674-5809.2010.01.015
ObjectiveTo investigate whether G-pretein-couple receptor 40 (GPR40) mediates the effects of free fatty acid (FFA) on proliferation of mouse insulin NIT-1cells.
MethodsThe expression of GPR40 in NIT-1 cells was inhibited by siRNA, and the effects of 12 or 48 h incubation with saturated fatty acid (SFA) and unsaturated fatty acid (UFA)on proliferation of NIT-1 cell transfected with GPR40 siRNA were observed. Cell proliferation was detected by cell counting kit-8 and Brdu-ELISA methods. The expression of Egr-1 in NIT-1 cells transfected with GPR40 siRNA or treated with FFAs was examined by Western blot. Analysis of variance was used for data analysis.
ResultsA 12-h exposure to different groups of FFA and 48-h exposure to oleate or linoleic acid stimulated the proliferation of NIT-1 cells, whereas 48-h exposure to palmitate or sterate inhibited the proliferation of NIT-1 cells. After co-incubation with palmitate and oleate for 48 h, the proliferation of NIT-1 cells was significantly increased when compared with that in palmitate or sterate treated cells. The mock-, control siRNA-, and GPR40 siRNA-transfected cells were supplemented with saturated fatty acids (palmitate or sterate), no significant difference in the absorbance values was indicated between the GPR40 siRNA tranfected cells and mock. Incubated with oleate or linoleic acid for 12 and 48 h, the absorbance values of GPR40 siRNA tranfected cells were less than that of the mock. After co-incubation with palmitate and oleate for 12 and 48 h, the absorbance values of GPR40 siRNA tranfected cells were less than that of mock (CCK-8: q was 7.834 and 8.236, P<0.05; Brdu-ELISA:q was 7.981 and 5.376, P<0.05). Western blot showed that Egr-1 was markedly activated by oleate, which was significantly inhibited by transfection with GPR40 siRNA.
ConclusionThe bilateral effects of SFA may be GPR40 independent. UFA promotes islet beta-cell proliferation, and counteracts the negative effects of SFA, which is mediated at least in part through GPR40; the process is accompanied by increased expression of Egr-1. Our data suggest that GPR40 might be implicated in the control of beta-cell compensation and GPR40 probably provide a link between obesity and type 2 diabetes mellitus.