Biological Activity:Harmine is a potent, selective and orally bioavailable DYRK1A inhibitor with IC50 of 80 nM. It inhibits phosphorylation of tau directly by DYRK1A (IC50 ~700 nM). It has >10-fold selectivity over DYRK3 and DYRK2 (IC50 ~800 nM and 900 nM respectively. Harmine is also a unique regulator of PPARγ expression that acts by inhibiting the Wnt signalling pathway in a cell-specific manner. It attenuates inflammatory gene expression (TNFα, IL-1β, iNOS) and macrophage accumulation in adipose tissue. Administration of harmine (30 mg/kg) to obese db/db mice resulted in reduced blood glucose, free fatty acids, and triglyceride levels, delayed hyperglycemia, and improved insulin sensitivity. Being function as a new class of human beta cell mitogenic compound, by using three different mouse and human islet in vivo-based models, harmine is able to induce beta cell proliferation, increase islet mass and improve glycemic control. The nuclear factors of activated T cells (NFAT) family of transcription factors are defined as likely mediators of human beta cell proliferation and differentiation.How to Use:In vitro: Harmine was used at 10 µM final concentration in various in vitro assays.In vivo: Harmine was dosed orally to obese db/db mice at 30 mg/kg. Harmine was dosed by intraperitoneal injection at 10 mg/kg in mouse partial pancreatectomy model (PPX), Euglycemic human islet transplantation model and diabetic marginal mass human islet transplantation model.Reference:
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