Prevention of diet-induced hepatic steatosis and hepatic insulin resistance by second generation antisense oligonucleotides targeted to the longevity gene mIndy (Slc13a5).
Reducing the expression of the Indy (I'm Not Dead Yet) gene in lower organisms extends life span by mechanisms resembling caloric restriction. Similarly, deletion of the mammalian homolog, mIndy (Slc13a5), encoding for a plasma membrane tricarboxylate transporter, protects from aging- and diet-induced adiposity and insulin resistance in mice. The organ specific contribution to this phenotype is unknown. We examined the impact of selective inducible hepatic knockdown of mIndy on whole body lipid and glucose metabolism using 2'-O-methoxyethyl chimeric anti-sense oligonucleotides (ASOs) in high-fat fed rats. 4-week treatment with 2'-O-methoxyethyl chimeric ASO reduced mIndy mRNA expression by 91% (P=0.001) compared to control ASO. Besides similar body weights between both groups, mIndy-ASO treatment lead to a 74% reduction in fasting plasma insulin concentrations as well as a 35% reduction in plasma triglycerides. Moreover, hepatic triglyceride content was significantly reduced by the knockdown of mIndy, likely mediating a trend to decreased basal rates of endogenous glucose production as well as an increased suppression of hepatic glucose production by 25% during a hyperinsulinemic-euglycemic clamp. Together, these data suggest that inducible liver-selective reduction of mIndy in rats is able to ameliorate hepatic steatosis and insulin resistance, conditions occurring with high calorie diets and during aging.
['Pesta|Dominik H|DH|', 'Perry|Rachel J|RJ|', 'Guebre-Egziabher|Fitsum|F|', 'Zhang|Dongyan|D|', 'Jurczak|Michael|M|', 'Fischer-Rosinsky|Antje|A|', 'Daniels|Martin A|MA|', 'Willmes|Diana M|DM|', 'Bhanot|Sanjay|S|', 'Bornstein|Stefan R|SR|', 'Knauf|Felix|F|', 'Samuel|Varman T|VT|', 'Shulman|Gerald I|GI|', 'Birkenfeld|Andreas L|AL|']
D000818:Animals D004041:Dietary Fats D005234:Fatty Liver D020868:Gene Silencing D005947:Glucose D015309:Glucose Clamp Technique D007333:Insulin Resistance D050356:Lipid Metabolism D008099:Liver D008136:Longevity D016376:Oligonucleotides, Antisense D051381:Rats D027981:Symporters
hepatic insulin resistance Slc13a5 Indy aging type 2 diabetes