title: Reduced allergic lung inflammation by root extracts from two species of Peucedanum through inhibition of Th2 cell activation.
abstract: BACKGROUND
  Peucedani Radix (PR), the root of Peucedanum praeruptorum Dunn (PPD) or Peucedanum decursivum (Miq.) Maxim. (PDM), has long been used in Korea to eliminate sputum, relieve cough, and reduce bronchus contraction. Furthermore, these therapeutic strategies are recognized as general and effective methods in western medicine as well as traditional Korean medicine.
  
  
  OBJECTIVE
  To determine and compare the anti-inflammatory effects of PPD extracts (PPDE) and PDM extracts (PDME) on allergic lung inflammation, using in vivo OVA-induced airway inflammation in mice and in vitro primary cell culture systems.
  
  
  METHODS
  Eight-week-old female C57BL/6 mice were placed into four groups (n=4 per group): saline control, OVA-induced allergic lung inflammation with vehicle, or PPDE (200mg/kg) or PDME (200mg/kg) treatment. PR extracts (PRE) were administered from 1 week before 1st OVA sensitization to the day before sacrifice. Mice were sacrificed 18h after last OVA intra-nasal challenge followed by histological and biochemical analyses.
  
  
  RESULTS
  Inflammatory phenotypes were alleviated with oral administration of PRE. PRE treatment decreased mucus production in airway epithelium, inflammatory cell number, eosinophilia, type 2 cytokines, and histamine in bronchoalveolar lavage fluid (BALF). Mice with PRE administration showed diminished activated CD4 T cell (CD4+CD25+cell) and GATA-3 level in the lung. In addition, PRE treatment reduced Th2 cell activation in vitro, using Th2 polarization system.
  
  
  CONCLUSIONS
  Our findings indicate that the anti-inflammatory effects of PRE arise from reduced Th2 cell activation and validate the clinical use of PR in traditional Korean medicine.
authors.affiliation: K-herb Research Center, Korea Institute of Oriental Medicine (KIOM), Daejeon 34054, Republic of Korea.
authors.forename: A-Reum
authors.initials: AR
authors.lastname: Lee
authors.affiliation: K-herb Research Center, Korea Institute of Oriental Medicine (KIOM), Daejeon 34054, Republic of Korea.
authors.forename: Jin Mi
authors.initials: JM
authors.lastname: Chun
authors.affiliation: K-herb Research Center, Korea Institute of Oriental Medicine (KIOM), Daejeon 34054, Republic of Korea.
authors.forename: A Yeong
authors.initials: AY
authors.lastname: Lee
authors.affiliation: K-herb Research Center, Korea Institute of Oriental Medicine (KIOM), Daejeon 34054, Republic of Korea.
authors.forename: Hyo Seon
authors.initials: HS
authors.lastname: Kim
authors.affiliation: K-herb Research Center, Korea Institute of Oriental Medicine (KIOM), Daejeon 34054, Republic of Korea.
authors.forename: Gyo Jeong
authors.initials: GJ
authors.lastname: Gu
authors.affiliation: K-herb Research Center, Korea Institute of Oriental Medicine (KIOM), Daejeon 34054, Republic of Korea. Electronic address: kbi3481@kiom.re.kr.
authors.forename: Bo-In
authors.initials: BI
authors.lastname: Kwon
mesh_terms: D000485:Allergens / Q000276:immunology; D000818:Animals; D018927:Anti-Asthmatic Agents / Q000494:pharmacology / Q000627:therapeutic use*; D019661:Apiaceae; D001249:Asthma / Q000188:drug therapy* / Q000276:immunology / Q000473:pathology; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry / Q000166:cytology / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D002452:Cell Count; D016207:Cytokines / Q000276:immunology; D004802:Eosinophilia / Q000188:drug therapy / Q000276:immunology / Q000473:pathology; D005260:Female; D050990:GATA3 Transcription Factor / Q000276:immunology; D006632:Histamine / Q000276:immunology; D007073:Immunoglobulin E / Q000097:blood; D008168:Lung / Q000187:drug effects / Q000276:immunology / Q000473:pathology; D008810:Mice, Inbred C57BL; D009093:Mucus / Q000378:metabolism; D010047:Ovalbumin / Q000276:immunology; D010936:Plant Extracts / Q000494:pharmacology / Q000627:therapeutic use*; D018517:Plant Roots
chemical_list: D000485:Allergens; D018927:Anti-Asthmatic Agents; D016207:Cytokines; D050990:GATA3 Transcription Factor; C494748:Gata3 protein, mouse; D010936:Plant Extracts; D007073:Immunoglobulin E; D006632:Histamine; D010047:Ovalbumin
keywords: Allergic lung inflammation; Histamine; Peucedanum decursivum (Miq.) Maxim (PDM); Peucedanum praeruptorum Dunn (PPD); Th2 cell activation; Type2 cytokines