Calcitonin gene-related peptide gene therapy suppresses reactive oxygen species in the pancreas and prevents mice from autoimmune diabetes

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Journal Title:
ACTA PHYSIOLOGICA SINICA
Issue:
Volume 55, Issue 06, 2003
DOI:
Key Word:
insulin-dependent diabetes mellitus;calcitonin gene-related peptide;gene therapy;reactive oxygen species

Abstract: Reactive oxygen species (ROS) is involved in autoimmune destruction of islet β cells, which has been proven to be an important underlying pathogenesis for insulin dependent diabetes mellitus (IDDM). Calcitonin gene-related peptide (CGRP) is a widely distributed neuropeptide, which has been found to play an important role in protecting myocytes from ROS. We hypothesized that exogenous CGRP gene administration before the pathogenic stage of insulitis might suppress the production of ROS and provide a hopeful therapeutic intervention for autoimmune diabetes. We performed CGRP gene transfer by injecting naked plasmid directly into skeletal muscles of mice with electroporation enhancement to achieve a continuous expression of CGRP in skeletal muscles, and thereby its secretion into the circulation. The effect of CGRP gene transfer on the pathogenesis of diabetes was studied in autoimmune diabetic mice induced by multiple low dose streptozotocin (MLDS). The CGRP gene therapy decreased morbidity of autoimmune diabetes, and significantly ameliorated hyperglycemia in these mice. CGRP gene transfer inhibited the production of ROS and malondialdehyde (MDA). In addition, it enhanced the activity of catalase (CAT) and superoxide dismutase (SOD) significantly. The data suggest that intramuscular CGRP gene transfer ameliorates autoimmune destruction of islet β cells, resulting in significant reduction in diabetes incidence of MLDS diabetes mice. CGRP benefits might be mediated at least in part by inhibiting the oxidative stress in islet β cells of these mice.

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