Hypoglycemic effect of rosmarinic acid-rich infusion (RosCE) from Origanum vulgare in alloxan-induced diabetic rats.

Origanum vulgare, known for its medicinal value, is officially accepted in many countries. The flowers and leaves are used globally in homeopathy. In Brazilian folk medicine, O. vulgare has been used to treat diabetes mellitus. This study evaluated the hypoglycemic activity of an infusion extract (RosCE) of commercially available O. vulgare leaves in alloxan-induced diabetic rats. Oral administration of RosCE resulted in the reduction of blood glucose levels after the first day of treatment, compared to the diabetic control group. These results showed that RosCE displays hypoglycemic activity, which may be due to the combined effect of rosmarinic acid, and other minor compounds. Reversed phase-high performance liquid chromatography-diode array detection was used to identify and quantify the major constituents of RosCE. This study presents evidence that supports the folkloric use of O. vulgare for the treatment of hyperglycemia, confirming the use of its infusion as an antidiabetic herbal medicine.

Pancreatic beta-cell regeneration

Cephalendra indica (41//v/v alcoholic extract of the wild variety of Cephalendra indica Naud.), on regular administration in doses ranging from 25uml to 75uml/100g of body weight (gbw) by the oral or intraperitoneal (ip) route produced a significant fall in blood sugar level in alloxan-induced diabetic rats. Biochemical studies showed stabilization of blood sugar level in 70//of cases at fourteen to twenty days after withdrawal of the drug. Histopathological studies revealed regeneration of pancreatic B cells. The hypothesis is that the drug acts through the hypothalamo-hypophysial-pancreatic axis, producing selective regeneration of B cells. The drug may indirectly release inhibitory factors from hypothalamic neurons, inhibiting the secretion of growth hormone and triggering insulin secretions from B cells. The therapeutic action of the drug on pancreatic B cells and lack of acute and subacute toxicity may open up new prospects in the treatment of diabetes mellitus