title: [Recombination of RegIII-proinsulin-pBudCE4.1 plasmid and its therapeutic effect on STZ-induced type 1 diabetes mellitus].
abstract: The aim of this study is to investigate the therapeutic effect of RegIII-proinsulin-pBudCE4.1 plasmid on streptozotocin (STZ)-induced type 1 diabetes mellitus and its underlying mechanisms. The model of type 1 diabetes mellitus was established by intraperitoneal injections of STZ (40 mg kg(-1)) to Balb/c mice for five consecutive days. Then, ten type 1 diabetic mice were intramuscularly injected with 100 microg RegIII-proinsulin-pBudCE4.1 plasmid for 4 weeks (one time/week) and the blood glucose levels were monitored every week; whereas another ten diabetic mice served as negative control group were injected with pBudCE4.1 vector at the same dose. Normal control and model control mice were treated with normal saline at identical volume under the same way. Western blotting, MTT assay, ELISA, HE staining and Tunel assay were applied to explore the underlying mechanisms. Results showed that RegIII-proinsulin-pBudCE4.1 plasmid ameliorated the hyperglycemia symptoms in diabetic mouse remarkably. It induced an immunological tolerance state in type 1 diabetic mice by inhibiting the proliferation of splenic lymphocytes and recovering Th1/Th2 balance evidenced by MTT and ELISA analysis. Furthermore, it elevated insulin concentration in the serum of type 1 diabetic mice and promoted the regeneration of beta cells supported by the results of HE staining and Tunel assay. In conclusion, RegIII-proinsulin-pBudCE4.1 plasmid possesses powerful anti-diabetic ability, which may be involved in the inducing of immunological tolerance and enhancing beta cells recovery.
authors.affiliation: Department of Pharmacology, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Wen-rui
authors.initials: WR
authors.lastname: Hou
authors.forename: Sheng-nan
authors.initials: SN
authors.lastname: Xie
authors.forename: Jing-li
authors.initials: JL
authors.lastname: Lu
authors.forename: Wei
authors.initials: W
authors.lastname: Xi
authors.forename: Xiang
authors.initials: X
authors.lastname: Luo
authors.forename: Ming
authors.initials: M
authors.lastname: Xiang
mesh_terms: D000818:Animals; D017209:Apoptosis; D001786:Blood Glucose / Q000378:metabolism; D049109:Cell Proliferation; D003921:Diabetes Mellitus, Experimental / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D003922:Diabetes Mellitus, Type 1 / Q000139:chemically induced / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D015316:Genetic Therapy; D006943:Hyperglycemia / Q000628:therapy; D007273:Injections, Intramuscular; D007328:Insulin / Q000097:blood; D007515:Islets of Langerhans / Q000166:cytology; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010957:Plasmids; D011384:Proinsulin / Q000235:genetics* / Q000378:metabolism / Q000627:therapeutic use; D011506:Proteins / Q000235:genetics* / Q000378:metabolism / Q000627:therapeutic use; D013311:Streptozocin; D013601:T-Lymphocytes / Q000166:cytology; D058408:Th1-Th2 Balance
chemical_list: D001786:Blood Glucose; D007328:Insulin; D011506:Proteins; C088549:RegIII protein, mouse; D013311:Streptozocin; D011384:Proinsulin