PT - JOURNAL ARTICLE AU - HJ Whittington AU - HA Lake AU - C Antoniades AU - S Neubauer AU - CA Lygate AU - S Zervou TI - P3 Crosstalk between glucose and creatine in the heart AID - 10.1136/heartjnl-2018-BSCR.8 DP - 2018 Mar 01 TA - Heart PG - A3--A3 VI - 104 IP - Suppl 3 4099 - http://heart.bmj.com/content/104/Suppl_3/A3.2.short 4100 - http://heart.bmj.com/content/104/Suppl_3/A3.2.full SO - Heart2018 Mar 01; 104 AB - Background Diabetic cardiomyopathy is characterised by metabolic remodelling, impaired glucose and high-energy phosphate metabolism. Transgenic mice overexpressing the creatine transporter in the heart (CrT-OE) have high intracellular creatine and elevated glucose, suggesting changes in substrate utilisation.Objective We aimed at investigating the unexplored glucose-creatine link, in addition to the involvement of shared molecules in glucose and creatine metabolism.Methods and results The correlation between myocardial creatine and glucose (r2=0.67; p=0.002) is accompanied by increased Glucose transporter 4 (Glut4) (p<0.05) and sodium-glucose co-transporter SGLT1 gene expression. Thioredoxin interacting protein (Txnip), that inhibits glucose and creatine transport (via Glut4 and CrT, respectively) is elevated in CrT-OE (p<0.05), indicating activation of both metabolic pathways.To test if modulating creatine in vivo alters glucose uptake, we measured 3H-2-deoxyglucose incorporation in isolated cardiomyocytes from CrT-OE and WT hearts. In WT, insulin caused a 2-fold increase (p<0.05) in glucose uptake, unaffected by exogenous creatine pre-exposure. CrT-OE cells showed blunted glucose uptake vs WT in response to insulin (p>0.05) and responded to creatine (p<0.01).In a cohort of samples taken during coronary artery by-pass surgery from diabetic and non-diabetic patients (n=8 each; blood glucose 90±7.1 and 138±16.5, respectively), there was a negative correlation between CrT and Glut4 transcript (r2=−0.5; p=0.028) further supporting the glucose-creatine relationship in the clinical setting.Conclusion Our observations suggest that changing myocardial creatine can regulate glucose uptake. Further studies will explore the potential use of creatine as a biochemical ‘switch’ to correct impaired glucose uptake and potentially insulin resistance.