1.Insulin resistance of islet cells: the central role of pathogenesis in type 2 diabetes?
Chinese Journal of Endocrinology and Metabolism 1986;0(03):-
Systemic insulin resistance has been well known. Recently, an important question has been raised regarding whether islet cells are resistant to insulin (insulin resistance of ?, ? and ? cells) due to the discovery of insulin receptor and its downstream insulin signaling pathways in islet cells. As a new study field of insulin resistance, the elucidation to this issue is crucial for the new insight into the mechanisms of insulin resistance per se and type 2 diabetes.
2.The Causes of 60 Cases on Post Crown's Failure in Clinical
Jiawei XIE ; Fengxin LIU ; Yunjie LI
Journal of Medical Research 2006;0(08):-
Objecive To evaluate the causes of 60 cases for clinical failure in post crown.Methods Sixty cases with failure in post crown cure were entered the study.The causes of failure were analyzed.Results Among the 60 cases with failure in post crown cure,38 cases were due to the crown'loosing or broken away,12 cases with the broken dental crown,10 cases with periapical periodontitis,6 cases with broken root.Conclusions It was the loosing or broken away of post crown,periapical periodontitis,dental crown and root broken consist of the main causes for clinical failure in post crown.
3.Relationship between polymorphisms of DNA repair gene XRCC1 and susceptibility to lung cancer
Jiawei LI ; Lina MU ; Guorong WEI
China Oncology 1998;0(04):-
Purpose:The current study analyzed the polymorp hisms of DNA repair gene XRCC1 and relationship between genetic variations and s usceptibility to lung cancer Methods:A case-control study of 111 patients with lung cancer a nd 210 normal residents as controls was conducted to detect XRCC1 polymorphisms at Arg399Gln loci . Genotypes were analyzed by PCR-based restriction fragment le ngth polymorphism(RLFP) techniques. Results:XRCC1 codon 399 heterozygous genotype Arg/Gln might hav e weaker protection effect on squamous cell carcinoma and reduce the risk of lun g cancer on smokers. Homozygous genotype Gln/Gln of XRCC1 codon 399 might increa se the risk of lung cancer and have synergistic effect with smoking. Conclusions:The results demonstrated that genetic polymorphism of XRCC1 DNA repair gene might contribute to the susceptibility to lung cancer a nd have synergistic effect with smoking.
4.Effect of periodontal mechanical therapy on periodontal health and interleukin-6 levels in gingival crevicular fluid in type 2 diabetic patients with chronic periodontitis
Jiawei TAN ; Lixin XIANG ; Li LIU
Chinese Journal of Geriatrics 2011;30(6):503-505
Objective To evaluate the effectiveness of periodontal mechanical therapy on periodontal health and interleukin-6 (IL-6) levels in gingival crevicular fluid (GCF) in type 2 diabetic patients with chronic periodontitis. Methods GCF samples were obtained with filter papers in first molar sites from 37 type 2 diabetic patients with chronic periodontitis. The randomized controlled and blinded clinical trial with a duration of six months was designed to compare effects between three groups of professional mechanical tooth cleaning (PMTC), i.e. coronal scaling (group Ⅱ) with periodontal initial therapy (group Ⅰ) and without clinical therapy (control group). The clinical periodontal index such as probing depth (PD), attachment loss (AL), modified bleeding index (mBI) and bacteria plaque index (PLI) were obtained with a Williams type periodontal probe. Laboratory examination including GCF volume, concentrations and total amounts of IL-6 in GCF were detected with ELISA method. Results Significantly decreasing trends of PD, AL, mBI, GCF volume and total amounts of IL-6 were observed in group Ⅰin all test period. The group Ⅱ had a significant reduction of PD at the third month as compared with baseline (⊿=0.36 mm, P<0.05), and the other figures showed descending trends but didn′t present statistical significances. At the end of study, the group Ⅰand Ⅱ had significant reductions of GCF volume compared with increases of control group (0.96 μ1>0.03 μ1mm>-0.20 μ1, P<0.05). Conclusions The sequential periodontal supra- and sub- gingival scaling has definitive effects on periodontal health improvement and on reducing the IL-6 level in GCF in type 2 diabetic patients.
5.Astragalus and angelica mixture inhibits the renal tubular epithelial cell injury induced by aristolochic-acid Ⅰ
Biao LI ; Jiawei TANG ; Shaoqing CAI ; Xiaomei LI
Journal of Peking University(Health Sciences) 2003;0(04):-
0.05).AA-I could induce the TGF-?1 secretion by HK-2 cells(18.26?5.98 ?g/L,vs.control,P
6.Effect of Acupoint Thread-embedding Therapy on Electrogastrogram and Gastrointestinal Hormones in Patients with Chronic Gastritis
Hong LI ; Suhe LI ; Chunzhi TANG ; Jiawei ZHANG
Journal of Guangzhou University of Traditional Chinese Medicine 1999;0(02):-
[ Objective ] To observe the therapeutic effect of acupoint thread-embedding therapy for chronic gastritis. [Methods] Seventy cases of chronic gastritis were randomized into group A ( n = 36, treated with acupoint thread-embedding therapy) and group B (n = 34, treated with acupuncture); the changes of electrogastrogram (ECG) and plasma contents of gastrin (Gas) and substance P (SP) were compared before and after treatment. [Results] The effective rate was 88.89% in group A and 76.47% in group B, the difference being significant ( P 0.05 ) while postprandial ECG frequency differed from that before treatment ( P 0.05). [Conclusion] Acupoint thread-embedding therapy exerts certain effect for the treatment of chronic gastritis; its therapeutic mechanism may be related to the regulation of gastrointestinal function by regulating gastrointestinal hormone levels and by increasing ECG amplitude and frequency.
7.Expressions, clinicopathological features and prognostic significance of HIF-1?, JNK1, P-gp, MRP1 and LRP proteins in human gastric carcinoma
Zhaorui YANG ; Qing WU ; Jiawei CHEN ; Dawei LI ; Shuxia LI
Journal of Third Military Medical University 2003;0(18):-
Objective To investigate the expressions, clinical pathological features and prognostic significance of HIF-1?, JNK1 and multidrug resistance proteins: P-gp, MRP1 and LRP in human gastric carcinoma. Methods The tissue microarray technique and immunohistochemical EnVision method were used to detect HIF-1?, JNK1, P-gp, MRP1 and LRP proteins in 135 specimens of gastric carcinoma and 27 gastric mucosa tissues. Results In gastric carcinoma, the positive expression rate of HIF-1?, JNK1, P-gp, MRP1and LRP was higher than that in gastric mucosa tissues (P
8.Fracture resistance ability of severe wedge-shaped premolar defects restored with fiber reinforced composite post by different methods
Qingyi SHEN ; Guoqiang LI ; Qiang ZHANG ; Beijun WENG ; Jiawei WENG
Chinese Journal of Tissue Engineering Research 2014;(25):4004-4008
BACKGROUND:Previous studies show that the fracture resistant force of endodonticaly treated teeth can be improved by post. But this idea has been controversial in recent years. Many scholars believe that the root canal preparation might weaken dental root the post increases the risk of tooth fracture. OBJECTIVE: To evaluate the fracture resistance ability of severe wedge-shaped-defect premolar to oblique loading, which was restored with fiber reinforced composite posts by different therapy methods. METHODS:A total of 50 human maxilary premolars were randomly divided into five groups, with ten teeth in each group. They were given folowing treatments: Group A: 10 untreated premolars; Rest 40 premolars of Groups B, C, D and E were prepared 1/3 bucco-lingual distance for artificial severe wedge-shaped defects at the buccal cervix. Group B: untreated severe wedge-shaped defects premolars; Group C: severe wedge-shaped defects premolars were endodonticaly treated, remaining dentin over hang above the wedge shaped defect, LuxaPost posts reinforced in buccal canal and lingual canal, LuxaCore composite resin restored dentin defect; Group D: severe wedge-shaped defects premolars were endodonticaly treated, LuxaPost posts reinforced in buccal canal and lingual canal, LuxaCore composite resin restored dentin defect, and then covered with ful metal crown; Group E: severe wedge-shaped defects premolars were endodonticaly treated, removing dentin over hang above the wedge shaped defect, LuxaPost posts reinforced in buccal canal and lingual canal, restored with LuxaCore composite resin, and then covered with ful metal crown. Fracture resistance of each specimen was measured in each group. RESULTS AND CONCLUSION: The fracture strength of each group were Group A (1 002.69±147.62) N, Group B (439.28±66.34) N, Group C (958.30±101.23) N, Group D (1 207.09±143.48) N, and Group E (1 056.44±139.30) N. Group D had the highest fracture strength (P < 0.01), while Group B had the lowest fracture strength (P < 0.01). There were no significant difference among the fracture strength of Group A, Group C and Group E. Our findings indicated that the fracture resistance of the severe wedge-shaped defected premolar can be improved by fiber reinforced composite post and dentin above wedge shaped defect remained.
9.The Preparation Investigation on Human Annexin V Dimmer(diannexin).
Jiong CAI ; Jiawei ZENG ; Fang LI ; Shizhen WANG
Journal of Medical Research 2006;0(02):-
Objective To prepare human annexin V dimmer and make chance for its pharmacological research.Methods Pichia pastoris transformed by human annexin V gene was used in this investigation.The engineered yeast was cultured in BMGY media and induced with methanol media BMMY for secreting expression of human annexin V.The final BMMY media supernatant was adopted for preparation of human annexin V dimmer by ammonium sulfate precipitation,molecular sieve separation and ultra-filtration concentration.The purification process was monitored by SDS-PAGE and coomassie brilliant blue staining.Results Human annexin V was obtained after two days induction of pichia pastoris in BMMY media.The human annexin V dimmer was successfully prepared from culture supernant by serial ammonium sulfate precipitation,molecular sieve separation and ultra-filtration concentration.Conclusion We prepare the human annexin V dimmer(diannexin V)successfully.
10.Preparation and rheological evaluation of ribavirin ophthalmic in situ-gel
Zhidong LIU ; Jiawei LI ; Rui LIU ; Xinhua ZHANG ; Zheng ZHAO
Chinese Journal of Tissue Engineering Research 2008;12(27):5374-5376
BACKGROUND: Ribavirin is easily diluted by lacrimal fluid and has low bioavailability. In situ ophthalmic gel changes from liquid drug to gel phase upon exposure to physiological conditions, resulting in an increase in the precorneal residence time of drugs. OBJECTIVE: To prepare ribavirin in situ ophthalmic gel and valuate its theological feature. DESIGN, TIME AND SETTING: In vitro controlled observation, performed at the Engineering Research Center of Modem Chinese Medicine Discovery and Preparation Technique, Ministry of Education, Tianjin University of Traditional Chinese Medicine between September and October 2006. MATERIALS: Sodium alginate, Carbopol, and ribavirin. METHODS: Sodium alginate (1% and 2%) and Carbopol (0.3%, 0.6%, and 2%) were combined at different proportions to prepare in sire ophthalmic gel, then in which ribavirin was added. MAIN OUTCOME MEASURES: Viscosity determinations of prepared different concentrations of formulations were determined using a cone and plate viscometer. RESULTS: Ribavirin in situ ophthalmic gel prepared with 1% sodium alginate and 0.6% Carbopol had the largest viscosity. The viscosity change was not influenced by the addition of ribavirin. The in situ ophthalmic gel prepared with sodium alginate and Carbopol changed to the gel phase upon exposure to lacrimal fluid. CONCLUSION: 1% sodium alginate and 0.6% Carbopol produced the best rheological feature and could prolonge the precorneal residence time of drug than that of conventional ophthalmic solution.