T. Balasubramanian

Antihyperglycemic and Antioxidant Activities of Medicinal Plant Stereospermum suaveolens in Streptozotocin-induced Diabetic Rats

The ethanol extract of Stereospermum suaveolens (EESS) bark was evaluated for its antihyperglycemic in addition to antioxidant effects in streptozotocin (STZ)-induced diabetic rats by acute and subacute models at dose levels of 200 and 400 mg/kg body weight, given orally. The ethanol extract showed a significant reduction in fasting blood glucose levels when compared to the standard drug, oral Glibenclamide (0.5 mg/kg body weight). The serum of rats treated with ethanol extract showed decreased levels of serum glutamate oxaloacetate transaminase, serum glutamate pyruvate transaminase, serum alkaline phosphatase, bilirubin, creatinine, urea, total cholesterol, triglycerides, and increased level of total proteins. EESS showed reduction in thiobarbituric acid reactive substances level and significantly increased the body weight (P < .001), glycogen, reduced glutathione, superoxide dismutase, and catalase activities, compared with STZ diabetic control in a dose-dependent manner. This finding shows that the ethanol extract of Stereospermum suaveolens exhibits potent antihyperglycemic and antioxidant properties.

Protective Effect of Ethyl Acetate Fraction of Stereospermum Suaveolens Against Hepatic Oxidative Stress in STZ Diabetic Rats.

Stereospermum suaveolens is a folk remedy for the treatment of diabetes and liver disorders in southern parts of India. In the present study, the protective effect of the ethyl acetate fraction of ethanol extract from S. suaveolens against hepatic oxidative stress was evaluated in streptozotocin (STZ)-induced diabetic rats for 14 days. The ethyl acetate fraction was administered orally to the STZ diabetic rats at the doses of 200 and 400 mg/kg. Blood glucose level was measured according to glucose oxidase method. In order to determine hepatoprotective activity, changes in the levels of serum biomarker enzymes such as aspartate transaminase (AST), alanine transaminase (ALT), and serum alkaline phosphatase (SALP) were assessed in the ethyl acetate fraction treated diabetic rats and were compared with the levels in diabetic control rats. In addition, the antioxidant activity of ethyl acetate fraction was evaluated using various hepatic parameters such as thiobarbituric acid reactive substances (TBARS), reduced glutathione (GSH), superoxide dismutase (SOD), and catalase (CAT). It was found that administration of ethyl acetate fraction (200 and 400 mg/kg) produced a significant (P < 0.001) fall in fasting blood glucose level, TBARS, bilirubin, AST, ALT, and SALP, while elevating the GSH levels, and SOD and CAT activities in diabetic rats. Histopathologic studies also revealed the protective effect of ethyl acetate fraction on the liver tissues of diabetic rats. It was concluded from this study that the ethyl acetate fraction from ethanol extract of S. suaveolens modulates the activity of enzymatic and nonenzymatic antioxidants and enhances the defense against hepatic oxidative stress in STZ-induced diabetic rats.

Effect of Potent Ethyl Acetate Fraction of Stereospermum suaveolens Extract in Streptozotocin-Induced Diabetic Rats

To evaluate the antihyperglycemic effect of ethyl acetate fraction of ethanol extract of Stereospermum suaveolens in streptozotocin-(STZ-) induced diabetic rats by acute and subacute models. In this paper, various fractions of ethanol extract of Stereospermum suaveolens were prepared and their effects on blood glucose levels in STZ-induced diabetic rats were studied after a single oral administration (200 mg/kg). Administration of the ethyl acetate fraction at 200 mg/kg once daily for 14 days to STZ-induced diabetic rats was also carried out. The parameters such as the fasting blood glucose, hepatic glycogen content, and pancreatic antioxidant levels were monitored. In the acute study, the ethyl acetate fraction is the most potent in reducing the fasting serum glucose levels of the STZ-induced diabetic rats. The 14-day repeated oral administration of the ethyl acetate fraction significantly reduced the fasting blood glucose and pancreatic TBARS level and significantly increased the liver glycogen, pancreatic superoxide dismutase, and catalase activities as well as reduced glutathione levels. The histopathological studies during the subacute treatment have been shown to ameliorate the STZ-induced histological damage of pancreas. This paper concludes that the ethyl acetate fraction from ethanol extract of Stereospermum suaveolens possesses potent antihyperglycemic and antioxidant properties, thereby substantiating the use of plant in the indigenous system of medicine.

Anti-inflammatory effect of Stereospermum suaveolens ethanol extract in rats

The anti-inflammatory effect of the ethanol extract of Stereospermum suaveolens (Roxb.) DC (Bignoniaceae) bark given orally at the dose of 200 and 400 mg/kg body weight was studied in rats using the carrageenan-, dextran-, and histamine-induced hind paw edema, and cotton pellet-induced granuloma formation models. Indomethcin at the dose of 10 mg/kg body weight was used as a standard drug. The extract (400 mg/kg body weight per os) showed maximum inhibition of edema 64.6, 53.48, and 50.06% at the end of 3 h with carrageenan-, dextran-, and histamine-induced rat paw edema, respectively. The extract (400 mg/kg) exhibited significant reduction (34.77%) in granuloma weight in the cotton pellet-induced granuloma model. From these results it could be concluded that, the ethanol extract of Stereospermum suaveolens possesses maximum anti-inflammatory activity in a dose-dependent manner, in various experimental models.

Therapeutic Effect of Stereospermum suavelolens on Diabetic Nephropathy

Objective: In Indian traditional medicine, decoctions from different parts of Stereospermum suavelolens are used for the treatment of various human diseases including diabetes mellitus. The present study was aimed to evaluate ethyl acetate fraction of ethanol extract from Stereospermum suavelolens for nephroprotective effects in Streptozotocin (STZ)-induced diabetic rats by sub acute model. Methods: The STZ induced diabetic rats were treated once daily, orally with ethyl acetate fraction of Stereospermum suavelolens for 14 days at the doses of 200 and 400 mg/kg. The serum and urine renal function parameters-creatinine, urea, uric acid, albumin and total proteins were measured on 15 th day. The in vivo antioxidant activity of Stereospermum suavelolens was also evaluated in diabetic rats. Effects of the fraction treatments on the kidney histological profile in STZ nephrotoxic rats were also evaluated. Results: The present study investigation showed that the ethyl acetate fraction of Stereospermum suavelolens significantly (P<0.001) attenuated elevations in the serum levels of creatinine, urea, uric acid and total proteins in diabetic treated rats as compared with diabetic control rats. Significant (P<0.001) increase in Superoxide Dismutase (SOD), reduced Glutathione (GSH) and Catalase (CAT) levels and reduction in Thiobarbituric Acid Reactive Substances (TBARS) levels were also observed in ethyl acetate fraction treated rats kidney. The histopathological study of kidney in drug treated rats shows significant protective effect against STZ oxidative stress. Conclusion: Our study concludes that the ethyl acetate fractions of Stereospermum suavelolens possess potent nephroprotective effect against oxidative stress in STZ induced diabetic rats.

Analgesic and Antipyretic Activities of Ethanol Extract of Stereospermum Suaveolens

ABSTRACT. Ethanol extract from the stem bark of Stereospermum suaveolens (Roxb.) DC (Bignoniaceae), given orally at the doses of 200 and 400 mg/kg body weight, was assessed for analgesic and antipyretic properties on different experimental animal models. Administration of ethanol extract of Stereospermum suaveolens (EESS) produced significant (p < .05, p < .001) dose-dependent analgesic effect in the tail flick, hot plate, and tail clip (central) as well as in acetic acid-induced writhing (peripheral) nociceptive tests in mice, suggesting the involvement of both central and peripheral mechanisms in alleviating the pain response. In the current study, indomethacin, aspirin, and morphine were used as the standard analgesic drugs. In addition, EESS also exhibited a significant (p < .05, p < .001) dose-dependent antipyretic response in Brewers yeast-induced pyrexia in rats and the results were comparable with that of paracetamol, a standard antipyretic agent. These results showed that the EESS possesses potent analgesic and antipyretic activity by dose-dependent manner, in various experimental animal models.

Hepatoprotective and antioxidant effects of Stereospermum suaveolens on carbon tetrachloride-induced hepatic damage in rats.

The ethanol extract of Stereospermum suaveolens (EESS) bark was evaluated for its hepatoprotective and antioxidant activities against carbon tetrachloride (CCl4)-induced liver damage, in wistar albino rats. The ethanol extract of Sterespermum suaveolens (EESS) bark (200 and 400 mg/kg body weight, p.o.) was administered to the experimental rats for 14 days. Silymarin (50 mg/kg body weight (b.w.) was given as the standard drug. The hepatoprotective activity was assessed using various serum biochemical parameters as glutamate oxaloacetate transaminase (SGOT), glutamate pyruvate transaminase (SGPT), alkaline phosphatase (ALP), bilirubin, and total proteins. Malondialdehyde (MDA) level as well as the activities of superoxide dismutase (SOD), reduced glutathione (GSH) and catalase (CAT) were determined to explain the possible mechanism of activity. The hepatoprotective activity was also supported by histopathological studies of liver tissue. The substantially elevated levels of serum GOT, GPT, ALP and total bilirubin, due to CCl4 treatment, were restored towards near normal by EESS, in a dose dependent manner. EESS also increased the serum total proteins of CCl4-intoxicated rats. Reduced enzymatic and non-enzymatic antioxidant levels and elevated lipid peroxide levels were restored towards near normal, by administration of EESS. A histological study showed a reduction of fatty degeneration and liver necrosis in EESS-treated rats. The results revealed that, the ethanol extract of Sterespermum suaveolens afforded significant dose dependent hepatoprotective and antioxidant effects in CCl4-induced hepatic damage.