CP-91149 is a human liver glycogen phosphorylase α (HLGPα) inhibitor with an IC50 of 0.13 μM in the presence of 7.5 mM glucose. CP-91149 suppressed glucagon-triggered glycogenolysis in isolated rat hepatocytes and in primary human hepatocytes. In vivo, oral injection of CP-91149 to diabetic ob/ob mice at 25–50 mg/kg led in rapid (3 h) glucose lowering by 100–120 mg/dl without producing hypoglycemia. In addition, upon treatment with CP-91149, A549 non-small cell lung carcinoma (NSCLC) cells accumulated glycogen with associated growth retardation. Treated normal skin fibroblasts also accumulated glycogen with G1-cell cycle arrest that was associated with inhibition of cyclin E-CDK2 activity. Overall, cells expressing high levels of brain GP were growth prevented by CP-91149 associating with glycogen accumulation whereas cells expressing low levels of brain GP were not affected by the agent.

>98%

Store at -20℃ for one year（Powder）；Store at 2-4℃ for two weeks；Store at -20℃ for six months after dissolution.

CP 91149

白色固体

DMSO ：74 mg/mL (185.1 mM)

Glycogen phosphorylase (GP)

CP-91149 displays 200-fold higher inhibitory activity against human liver glycogen phosphorylase a (HLGPa) than caffeine (IC50 = 26 μM). CP-91149 (10-100 μM) inhibits glucagon-stimulated glycogenolysis in isolated rat hepatocytes in a dose-dependent manner, and in primary human hepatocytes with IC50 of ~2.1 μM. CP-91149 also potently inhibits the activities of human muscle phosphorylase a and b with IC50 of 0.2 μM and ~0.3 μM, respectively. CP-91149 treatment at 2.5 μM induces inactivation of phosphorylase and sequential activation of glycogen synthase in hepatocytes, and increases glycogen synthesis by 7-fold at 5 mM glucose and by 2-fold at 20 mM glucose. CP-91149 can partially counteract the effects of phosphorylase overexpression. CP-91149 also potently inhibits brain GP with IC50 of 0.5 μM in A549 cells. CP-91149 treatment at 10-30 μM causes significant glycogen accumulation in A549 and HSF55 cells. CP-91149 treatment increases G1-phase cells with a significant reduction of the S-phase population in HSF55 cells, correlated with increased expression of p21 and p27. CP-91149 also promotes the dephosphorylation and activation of GS (glycogen synthase) in non-engineered or GP-overexpressing cultured human muscle cells, but exclusively in glucose-deprived cells.

Oral administration of CP-91149 to diabetic ob/ob mice at 25-50 mg/kg causes rapid (3 hours) glucose lowering by 100-120 mg/dl without producing hypoglycemia, resulting from inhibition of glycogenolysis in vivo. CP-91149 treatment does not lower glucose levels in normoglycemic, nondiabetic mice. In the non-fasted Goto-Kakizaki (GK) rats, administration of CP-91149 in combination with CS-917 suppresses hepatic glycogen reduction by CS-917 and decreases plasma glucose more than single administration of CS-917.