title: In vitro and in vivo protective effect of Ganoderma lucidum polysaccharides on alloxan-induced pancreatic islets damage.
abstract: This study was undertaken to investigate the protective effect against alloxan-induced pancreatic islets damage by Ganoderma lucidum Polysaccharides (Gl-PS) isolated from the fruiting body of Ganoderma lucidum (Leyss. ex Fr.) Karst. In vitro, alloxan caused dose-dependent toxicity on the isolated pancreatic islets. Pre-treatment of islets with Gl-PS for 12 h and 24 h significantly reversed alloxan-induced islets viability loss. Gl-PS was also found to inhibit the free radicals production induced by alloxan in the isolated pancreatic islets using confocal microscopy. Gl-PS dose-dependently increased serum insulin and reduced serum glucose levels when pretreated intragastrically for 10 days in alloxan-induced diabetic mice. It was found that the pancreas homogenates had higher lipid peroxidation products in alloxan-treated mice than in the Gl-PS-treated animals. Aldehyde fuchsin staining revealed that alloxan caused nearly all the beta cells disappearing from the pancreatic islets, while Gl-PS partly protected the beta cells from necrosis. Alloxan (60 mg/kg) induced NF-kappa B activation in the pancreas at 30 min after injection, pretreatment with Gl-PS inhibited alloxan-induced activation of NF-kappa B. These results suggest that Gl-PS was useful in protecting against alloxan-induced pancreatic islets damage in vitro and in vivo; one of the mechanisms is through its scavenging ability to protect the pancreatic islets from free radicals-damage induced by alloxan.
authors.affiliation: Department of Pharmacology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Beijing 100083, PR China.
authors.forename: Hui-Na
authors.initials: HN
authors.lastname: Zhang
authors.forename: Jing-Hua
authors.initials: JH
authors.lastname: He
authors.forename: Lan
authors.initials: L
authors.lastname: Yuan
authors.forename: Zhi-Bin
authors.initials: ZB
authors.lastname: Lin
mesh_terms: D000496:Alloxan / Q000633:toxicity*; D000818:Animals; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D003921:Diabetes Mellitus, Experimental / Q000517:prevention & control; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D004365:Drugs, Chinese Herbal / Q000494:pharmacology* / Q000627:therapeutic use; D016166:Free Radical Scavengers / Q000494:pharmacology / Q000627:therapeutic use; D006943:Hyperglycemia / Q000517:prevention & control; D007515:Islets of Langerhans / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D051379:Mice; D016328:NF-kappa B / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D010936:Plant Extracts / Q000494:pharmacology* / Q000627:therapeutic use; D011134:Polysaccharides / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats; D017208:Rats, Wistar
chemical_list: D004338:Drug Combinations; D004365:Drugs, Chinese Herbal; D016166:Free Radical Scavengers; D016328:NF-kappa B; D010936:Plant Extracts; D011134:Polysaccharides; D000496:Alloxan