Antidiabetic effects of Salvia triloba and Thymus praecox subsp. skorpilii var. skorpilii in a rat model of streptozotocin/nicotinamide-induced diabetes

Abstract

Some Salvia and Thymus species of Lamiaceae family come into

prominence with strong antidiabetic effects. Compared to the

other species, there are limited studies on antidiabetic activity

of Salvia triloba (ST) and Thymus praecox subsp. skorpilii var.

skorpilii (TPS). The aim of this study was to adjust the dosage

and to determine the antidiabetic effects of methanol extracts

of ST and TPS in streptozotocin/nicotinamide-induced diabetic

rats. Type II diabetes mellitus (T2DM) was induced by a

single intraperitoneal (i.p.) injection of streptozotocin (STZ)

dissolved in 0.1 M cold citrate buffer (pH 4.5) at a dose of 55

mg/kg/body weight (b.w.) and nicotinamide (100 mg/kg/b.w.)

was given prior to STZ injection. For adjusting dosage, oral

glucose tolerance test (OGTT) was used while insulin tolerance

test (ITT), OGTT, blood glucose levels and animal weights

were used to evaluate the antidiabetic effects of ST and TPS.

According to the OGTT, the most effective doses for ST and

TPS were 200 mg/kg and 100 mg/kg, respectively. At the end

of three weeks, blood glucose levels of control goup reached

to 462.50 mg/dl, whereas ST and TPS-treated groups blood

glucose levels decreased less than 200.00 mg/dl. In conclusion,

the present study suggests that both of ST and TPS methanolic

extracts may be of therapeutic benefit in diabetes and thus need

to further studies.

Keywords

• Type II diabetes mellitus ; Salvia triloba ; Thymus praecox ; Streptozotocin-Nicotinamide ; herbal medicines ; antidiabetic

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