title: Recombinant adenoviral expression of IL-10 protects beta cell from impairment induced by pro-inflammatory cytokine.
abstract: Interleukin-10 (IL-10) is a pleiotropic immunosuppressive and immunostimulatory cytokine. In autoimmune diabetes of the nonobese diabetic (NOD) mouse, IL-10 has exhibited paradoxical effects. Systemic IL-10 expression prevented or delayed diabetes onset in NOD mice while local expression of IL-10 did not. As antigen-presenting cells (APCs) play a central role in the generation of primary T cell responses, the direct role of this gene in pancreatic beta (β) cell is not clear. The effects of IL-10 on the protection of β cells in vitro were examined. In the present study, we examined the effects of adenovirus vector-mediated murine IL-10 (mIL-10) gene transfer to islet cell line RINm5F cells in vitro and to explore if IL-10 overexpression may prevent cytokine-mediated cytotoxicity. We had established the recombinant adenovirus vector containing mIL-10 genes (Ad-mIL-10) successfully. After infection of Ad-mIL-10, both mRNA and protein were expressed in RINm5F cells. Moreover, RINm5F cells secreted IL-10 protein into culture medium. Ad-mIL-10 prevented IL-1β-mediated nitric oxide production from β cells in vitro as well as the suppression of β cells function as determined by glucose-stimulated insulin production. Furthermore, Ad-mIL-10 gene transfer led to a profound reduction of Fas-expressing β cells and caspase-3 activity which were induced by IL-1β and the apoptotic rates of Ad-mIL-10 group were decreased. These findings show that IL-10 gene transfer to β cells may be beneficial in maintaining cells function, protecting islet cells from apoptosis-mediated by factors, which showed the potential therapy for type 1 diabetes mellitus.
authors.affiliation: Department of Pediatrics, Affiliated Hospital of Qingdao Medical College, Qingdao University, Qingdao, China.
authors.forename: Ai-Jing
authors.initials: AJ
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Zhu
authors.forename: Fei
authors.initials: F
authors.lastname: Tian
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Yan
authors.forename: Tang
authors.initials: T
authors.lastname: Li
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D001483:Base Sequence; D015153:Blotting, Western; D002460:Cell Line; D016207:Cytokines / Q000502:physiology*; D017931:DNA Primers; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D006801:Humans; D018836:Inflammation Mediators / Q000502:physiology*; D016753:Interleukin-10 / Q000235:genetics / Q000502:physiology*; D007515:Islets of Langerhans / Q000378:metabolism / Q000473:pathology*; D011994:Recombinant Proteins / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014161:Transduction, Genetic
chemical_list: D016207:Cytokines; D017931:DNA Primers; D018836:Inflammation Mediators; D011994:Recombinant Proteins; D016753:Interleukin-10