title: Bioactive diels-alder type adducts from the stem bark of Morus macroura.
abstract: Five new compounds, named guangsangons A (1), B (5), C (6), D (7), and E (8), along with four known compounds, albafuran C (2), kuwanon X (3), kuwanon P (4), and kuwanon Y (9) were isolated from Morus macroura Miq.. Their structures were determined by means of spectroscopic analyses and chemical methods. These compounds were regarded biogenetically as Diels-Al-der type adducts, and 1H-NMR variable temperature experience suggested that they all existed as an equilibrium mixture of conformational isomers in solution. Compounds 1-3 and 5-9 showed good anti-oxidation activity, with the inhibitory rate of malondialdehyde being from 90.1% to 102.7% at a concentration of 10(-4) mol/L and from 70.9% to 88.1% at a concentration of 10(-5) mol/L. Compounds 1, 5, and 7 showed anti-inflammation activity, with the inhibitory rates of release of lysosome enzyme from polymorphonuclear leukocytes of rats being 19.0% (P > 0.05), 57.3% (P < 0.001) and 24.3% (P < 0.05) at concentrations of 10(-5) mol/L, respectively.
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, P.R. China.
authors.forename: Sheng-Jun
authors.initials: SJ
authors.lastname: Dai
authors.forename: Zhong-Mao
authors.initials: ZM
authors.lastname: Mi
authors.forename: Zhi-Bo
authors.initials: ZB
authors.lastname: Ma
authors.forename: Shuai
authors.initials: S
authors.lastname: Li
authors.forename: Ruo-Yun
authors.initials: RY
authors.lastname: Chen
authors.forename: De-Quan
authors.initials: DQ
authors.lastname: Yu
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D000975:Antioxidants / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D005966:Glucuronidase / Q000096:biosynthesis; D008315:Malondialdehyde / Q000378:metabolism; D031625:Morus; D009504:Neutrophils / Q000187:drug effects* / Q000201:enzymology; D008517:Phytotherapy; D024301:Plant Bark; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000975:Antioxidants; D010936:Plant Extracts; D008315:Malondialdehyde; D005966:Glucuronidase