title: [Effect of progesterone on high mobility group Box-1 protein-induced interleukin-6 release by human umbilic vein endothelial cells].
abstract: OBJECTIVE
  To study the effect of progesterone on interleukin-6 (IL-6) release from human umbilic vein endothelial cells (HUVECs) induced by high mobility group box-1 protein (HMGB1).
  
  
  METHODS
  The recombinant expression plasmid pET14b-HMGB1 was constructed and transformed into competent E.coli BL21 cells to obtain HMGB1 protein, which was purified with chromatography on Ni-NTA Sepharose column. Cultured HUVECs were treated with purified HMGB1 protein alone at the concentrations 0, 10, 100, 500, and 1000 ng/ml, progesterone alone at the concentrations of 0, 0.1, 1, 10, 100 mmol/L, or with both HMGB1 protein (500 ng/ml) and progesterone at the terminal concentrations of 0, 0.1, 1, 10, and 100 mmol/L. Twenty-four hours later, the supernatant of the cell culture medium was collected to detect the levels of IL-6 using enzyme-linked immunosorbent assay (ELISA).
  
  
  RESULTS
  The IL-6 levels in HUVEC culture medium was slightly decreased after treatment with low-concentration HMGB1 but increased obviously following treatment with high-concentration HMGB1, and these effects could be dose-dependently inhibited by progesterone. Progesterone alone did not result in any noticeable changes of IL-6 levels in the cell culture medium.
  
  
  CONCLUSIONS
  Progesterone can dose-dependently inhibit HMGB1-induced IL-6 release from HUVECs, suggesting the protective role of progesterone in endotoxemia.
authors.affiliation: Department of Gynecology and Obstetrics, Xiaolan People's Hospital, Zhongshan 528415, China. zhangying196707@126.cim
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.forename: Wei-dong
authors.initials: WD
authors.lastname: Li
authors.forename: Chun-xin
authors.initials: CX
authors.lastname: Chi
mesh_terms: D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D042783:Endothelial Cells / Q000166:cytology / Q000378:metabolism*; D024742:HMG-Box Domains; D024243:HMGB1 Protein / Q000494:pharmacology*; D006801:Humans; D015850:Interleukin-6 / Q000096:biosynthesis*; D011374:Progesterone / Q000494:pharmacology*; D014471:Umbilical Veins / Q000166:cytology* / Q000378:metabolism
chemical_list: D024243:HMGB1 Protein; D015850:Interleukin-6; D011374:Progesterone