Diabetes & Metabolism Journal

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Polymeric Gene Delivery for Diabetic Treatment: Sung Wan Kim; Diabetes Metab J. 2011;35(4):317-326. Published online August 31, 2011; DOI: https://doi.org/10.4093/dmj.2011.35.4.317

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Several polymers were used to delivery genes to diabetic animals. Polyaminobutyl glycolic acid was utilized to deliver IL-10 plasmid DNA to prevent autoimmune insulitis of non-obese diabetic (NOD) mouse. Polyethylene glycol grafted polylysine was combined with antisense glutamic acid decarboxylase (GAD) MRNA to represent GAD autoantigene expression. GLP1 and TSTA (SP-EX4) were delivered by bioreducible polymer to stop diabetic progression. Fas siRNA delivery was carried out to treat diabetic NOD mice animal.

Citations

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Original Article

The Stimulatory Effect of IL-1on The Insulin Secretion and Its Relating Factors.: In Kyung Jeong, Seung Hoon Oh, Tong Mook Kang, Jae Hoon Jeong, Yong Ki Min, Myung Shik Lee, Moon Kyu Lee, Kwang Won Kim; Korean Diabetes J. 2000;24(4):431-443. Published online January 1, 2001

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Abstract PDF: BACKGROUND
The inhibitory effect of IL-1 on the insulin secretion has been validated in pathogenesis of type 1 diabetes, but complex results about the stimulatory effect of IL-1 have been reported. The aims of this study are to clarify the effects of IL-1 on insulin secretion of pancreatic islets and to investigate the mechanisms in terms of preproinsulin synthesis, inducible NOS expression, and calcium channel activity. METHODS: Islets were isolated from male Sprague-Dawley (SD) rat by modified Lacy-Kostianovsky's method. After islets were treated with different concentrations (0, 0.5, 5, 50, 500 pmol/L) and exposure time (2, 6, 24 hours) of IL-1 , morphology, viability, static stimulation of insulin to glucose, insulin content, preproinsulin mRNA expression, iNOS mRNA expression and calcium channel activity were measured. RESULTS: 1) Viability of islets was reduced in high concentrations of long term exposure of IL-1 . 2) Insulin secretion was stimulated in islets treated with 5, 50, and 500 pmol/L of IL-1 for 2 hours and 0.5 pmol/L for 6 hours. It was inhibited in 5, 50, and 500 pmol/L for 6 and 24 hours. 3) Insulin content was not significantly different regardless of concentration and exposure time of IL-1 . 4) Preproinsulin mRNA expression increased in islets treated with 50, 500 pmol/L of IL-1 for 2 hours. After 24 hours, it decreased in dose dependent manner. 5) iNOS mRNA expression was detectable after 2 hours in the presence of IL-1 , peaks at 6 hour and decreased after 24hours. It was increased above 5 pmol/L of IL-1 in dose dependent manner. 6) Activities of the voltage-dependent Ca2+ channels were not different among groups. CONCLUSION: IL-1 plays a positive role in terms of insulin secretion and insulin synthesis in high concentration of short term or low concentration of long term. These effects of IL-1 might be neither dependent of iNOS pathway nor Ca2+ channel activity.

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