TW68, Cryptochromes stabilizer, regulates fasting blood glucose level in ob/ob and fat-induced diabetic mice

Cryptochromes (CRYs), transcriptional repressors of the circadian clock in mammals, inhibit cAMP production when glucagon activates G-protein coupled receptors. Therefore, molecules that modulate CRYs have the potential to regulate gluconeogenesis. In this study, we discovered a new molecule called TW68 that interacts with the primary pockets of mammalian CRY1/2, leading to reduced ubiquitination levels and increased stability. In cell-based circadian rhythm assays using U2OS: Bmal1 -d Luc cells, TW68 extended the period length of the circadian rhythm. Additionally, TW68 decreased the transcriptional levels of two genes, Phosphoenolpyruvate carboxykinase 1 ( PCK1 ) and Glucose-6-phosphatase ( G6PC ), which play crucial roles in glucose biosynthesis during glucagon-induced gluconeogenesis in HepG2 cells. Oral administration of TW68 in mice showed good tolerance, a good pharmacokinetic profile, and remarkable bioavailability. Finally, when administered to fasting ob/ob and fat-induced diabetic animals, TW68 reduced blood glucose levels by enhancing CRY stabilization and subsequently decreasing the transcriptional levels of Pck1 and G6pc . These findings collectively demonstrate the antidiabetic efficacy of TW68 in vivo , suggesting its therapeutic potential for controlling fasting glucose levels in the treatment of type 2 diabetes mellitus . ### Competing Interest Statement The authors have declared no competing interest.