title: Effects of RNA interference-induced tryptase down-regulation in P815 cells on IL-6 and TNF-alpha release of endothelial cells.
abstract: OBJECTIVE
  To explore the effects of down-regulated tryptase expression in mast cells on the synthesis and release of interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-alpha) of vascular endothelial cells.
  
  
  METHODS
  Tryptase-siRNA (small-interfering RNA) vector was constructed to inhibit tryptase expression in P815 cells. The medium of P815 cells treated by the tryptase-siRNA (RNAi-P815 group) or pure vector (P815 group) was collected and used to culture bEnd.3 cells. The messenger RNAs (mRNAs) of IL-6 and TNF-alpha in bEnd.3 cells and their protein levels in the medium were measured by reverse transcription polymerase chain reaction (RT-PCR) and enzyme-linked immunosorbent assay (ELISA), respectively.
  
  
  RESULTS
  IL-6 and TNF-alpha mRNAs in bEnd.3 cells cultured in RNAi-P815-conditioned medium decreased significantly compared to those in P815-conditioned medium. Consistently, IL-6 and TNF-alpha protein levels in the medium of bEnd.3 of RNAi-P815 group were lower than those of P815 group.
  
  
  CONCLUSIONS
  Reduced tryptase expression significantly inhibited the synthesis and release of IL-6 and TNF-alpha in vascular endothelial cells. RNA interference targeting tryptase expression may be a new anti-inflammatory strategy for vascular diseases.
authors.affiliation: Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai 200032, China.
authors.forename: Yi-feng
authors.initials: YF
authors.lastname: Jiang
authors.forename: Feng-di
authors.initials: FD
authors.lastname: Zhao
authors.forename: Xiao-bo
authors.initials: XB
authors.lastname: Li
authors.forename: Yan-xia
authors.initials: YX
authors.lastname: Ning
authors.forename: Xiu-ling
authors.initials: XL
authors.lastname: Zhi
authors.forename: Rui-zhe
authors.initials: RZ
authors.lastname: Qian
authors.forename: Lian-hua
authors.initials: LH
authors.lastname: Yin