title: Effect of pollen from Typha angustata on hydrogen peroxide induced toxicity in osteoblastic MC3T3-E1 cells.
abstract: BACKGROUND
  Typha angustata is a traditional Chinese medicine, commonly used for a variety of clinical disorders, including atherosclerosis and wound healing. In the present study, the protective effects of T. angustata pollen extract (TE) on the response of osteoblast to oxidative stress were evaluated.
  
  
  METHODS
  Osteoblastic MC3T3-E1 cells were incubated with H(2)O(2) and/or TE, and markers of osteoblast function and oxidative damage were examined.
  
  
  RESULTS
  TE treatment significantly (P < 0.05) reversed the cytotoxic effect of H(2)O(2) and this effect was blocked by ICI182780, suggesting that TE's effect might be partly involved in estrogen action. TE significantly (P < 0.05) increased collagen content, alkaline phosphatase activity, calcium deposition of osteoblasts in the presence of H(2)O(2) and these effects were blocked by rottlerin and PD98059, suggesting that the induction of differentiation by TE is associated with increased activation of protein kinase C and ERK. Moreover, H(2)O(2)-induced reduction of osteocalcin was significantly recovered in the presence of TE. Pretreatment with TE also decreased the increase in receptor activator of nuclear factor-kB ligand, malondialdehyde, and protein carbonyl induced by H(2)O(2).
  
  
  CONCLUSIONS
  These results suggest that the pollen of T. angustata may be useful for the protection of H(2)O(2)-induced oxidative damage and dysfunction in osteoblasts.
authors.affiliation: Department of Food & Nutrition, Education Graduate School, Kyung Hee University, 1, Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Korea.
authors.forename: Young Soon
authors.initials: YS
authors.lastname: Lee
authors.forename: Eun Mi
authors.initials: EM
authors.lastname: Choi
mesh_terms: D016475:3T3 Cells; D000098:Acetophenones / Q000494:pharmacology; D000469:Alkaline Phosphatase / Q000187:drug effects; D000818:Animals; D001578:Benzopyrans / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000037:antagonists & inhibitors; D018929:Cell Culture Techniques; D002454:Cell Differentiation / Q000187:drug effects; D003094:Collagen / Q000187:drug effects; D004789:Enzyme Activation / Q000187:drug effects; D004958:Estradiol / Q000031:analogs & derivatives / Q000494:pharmacology; D004965:Estrogen Antagonists / Q000494:pharmacology; D048049:Extracellular Signal-Regulated MAP Kinases / Q000187:drug effects; D005419:Flavonoids / Q000494:pharmacology; D000077267:Fulvestrant; D006861:Hydrogen Peroxide / Q000633:toxicity*; D015227:Lipid Peroxidation / Q000187:drug effects; D008315:Malondialdehyde / Q000032:analysis; D051379:Mice; D010006:Osteoblasts / Q000187:drug effects*; D015675:Osteocalcin / Q000187:drug effects; D016877:Oxidants / Q000633:toxicity*; D018384:Oxidative Stress / Q000187:drug effects; D010936:Plant Extracts / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D011058:Pollen; D050050:Protein Carbonylation / Q000187:drug effects; D011493:Protein Kinase C / Q000187:drug effects; D053245:RANK Ligand / Q000187:drug effects; D032401:Typhaceae
chemical_list: D000098:Acetophenones; D001578:Benzopyrans; D004965:Estrogen Antagonists; D005419:Flavonoids; D016877:Oxidants; D010936:Plant Extracts; D053245:RANK Ligand; D015675:Osteocalcin; D000077267:Fulvestrant; D004958:Estradiol; D008315:Malondialdehyde; D003094:Collagen; D006861:Hydrogen Peroxide; C085746:rottlerin; D011493:Protein Kinase C; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D048049:Extracellular Signal-Regulated MAP Kinases; D000469:Alkaline Phosphatase; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one; D002118:Calcium