title: Effect of an antidiabetic extract of Catharanthus roseus on enzymic activities in streptozotocin induced diabetic rats.
abstract: Hypoglycemic activity was detected in dichloromethane:methanol extract (1:1) of leaves and twigs of Catharanthus roseus (family Apocynaceae), a traditionally used medicinal plant, using streptozotocin (STZ) induced diabetic rat model. Extract at dose 500 mg/kg given orally for 7 and 15 days showed 48.6 and 57.6% hypoglycemic activity, respectively. Prior treatment at the same dose for 30 days provided complete protection against STZ challenge (75 mg/kg/i.p.x1). Enzymic activities of glycogen synthase, glucose 6-phosphate-dehydrogenase, succinate dehydrogenase and malate dehydrogenase were decreased in liver of diabetic animals in comparison to normal and were significantly improved after treatment with extract at dose 500 mg/kg p.o. for 7 days. Results indicate increased metabolization of glucose in treated rats. Increased levels of lipid peroxidation measured as 2-thiobarbituric acid reactive substances (TBARS) indicative of oxidative stress in diabetic rats were also normalized by treatment with the extract.
authors.affiliation: Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi 110054, India. shoba72@yahoo.com
authors.forename: S N
authors.initials: SN
authors.lastname: Singh
authors.forename: P
authors.initials: P
authors.lastname: Vats
authors.forename: S
authors.initials: S
authors.lastname: Suri
authors.forename: R
authors.initials: R
authors.lastname: Shyam
authors.forename: M M
authors.initials: MM
authors.lastname: Kumria
authors.forename: S
authors.initials: S
authors.lastname: Ranganathan
authors.forename: K
authors.initials: K
authors.lastname: Sridharan
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000187:drug effects / Q000378:metabolism; D015992:Body Mass Index; D030008:Catharanthus / Q000737:chemistry*; D003921:Diabetes Mellitus, Experimental / Q000188:drug therapy* / Q000201:enzymology; D005978:Glutathione / Q000187:drug effects / Q000378:metabolism; D007004:Hypoglycemic Agents / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000201:enzymology*; D008297:Male; D000432:Methanol / Q000737:chemistry; D008752:Methylene Chloride / Q000737:chemistry; D018384:Oxidative Stress / Q000187:drug effects; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology* / Q000627:therapeutic use; D018520:Plant Shoots; D010946:Plants, Medicinal; D051381:Rats; D017207:Rats, Sprague-Dawley; D013311:Streptozocin
chemical_list: D001786:Blood Glucose; C046419:Catharanthus roseus extract; D007004:Hypoglycemic Agents; D010936:Plant Extracts; D008752:Methylene Chloride; D013311:Streptozocin; D005978:Glutathione; D000432:Methanol