Abstract
In streptozotocin (STZ)-induced diabetic rats, pyrazinoylguanidine (PZG) markedly reduced elevated fasting concentrations of plasma glucose, triglycerides, and cholesterol. In contrast, these parameters were unaffected by a sulfonylurea, glyburide, or by a biguanide, metformin. PZG's glucose- and lipid-lowering effects were dose-dependent. These metabolic effects were also investigated after: (a) pyrazinoic acid (PZA), a metabolite of PZG; (b) 3-amino-PZG, an analog of PZG, and (c) 3-amino-PZA, a hydrolytic product of 3-amino-PZG. PZA moderately reduced elevated fasting glucose and lipid concentrations in STZ-diabetic rats, suggesting partial medication of PZG's antidiabetic actions by PZA. Neither 3-amino-PZG nor 3-amino-PZA exerted any glucose- or lipid-lowering effect in STZ-diabetic rats.
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