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Airway Inflammation Induced By Recombinant Guinea Pig Tumor Necrosis Factor-Alpha

  1. Author:
    White, A. M.
    Yoshimura, T.
    Smith, A. W.
    Westwick, J.
    Watson, M. L.

  2. Author Address

    Watson ML UNIV BATH SCH PHARM & PHARMACOL BATH BA2 7AY AVON ENGLAND UNIV BATH SCH PHARM & PHARMACOL BATH BA2 7AY AVON ENGLAND NCI FREDERICK CANC RES & DEV CTR FREDERICK, MD 21702 USA
    1. Year: 1997
  2. Journal: American Journal of Physiology - Lung Cellular & Molecular Physiology
    1. 17
    2. 3
    3. Pages: L 524-L 530
  4. Type of Article: Article
  1. Abstract:

    We have cloned and expressed recombinant guinea pig tumor necrosis factor-alpha (gpTNF-alpha) and examined its inflammatory activities after tracheal instillation in guinea pigs. A 1,071-bp cDNA, including the region encoding the full-length 234-amino acid gpTNF-alpha protein, was cloned from concanavalin A-stimulated guinea pig splenocytes. The 154-amino acid protein corresponding to secreted gpTNF-alpha was expressed as a fusion protein in Escherichia coli, purified by affinity chromatography, and cleaved to yield a 17-kDa protein. gpTNF-alpha had a cytotoxic effect on WEHI 164 cells and was detected by goat anti-murine tumor necrosis factor-alpha (TNF-alpha) antibody in Western blots. Intratracheal instillation of gpTNF-alpha (50-150 ng) caused pronounced and dose-dependent airway eosinophilia. Incubation of gpTNF-alpha with rabbit anti-murine TNF-alpha sera or heating the gpTNF-alpha before instillation reduced bronchoalveolar lavage (BAL) eosinophils to near control levels. Maximum BAL eosinophilia was observed at 24 h, but eosinophil numbers remained significantly above vehicle-treated animals for 72 h. Hence, gpTNF-alpha elicits a pronounced and protracted eosinophil accumulation in the guinea pig lung. [References: 31]

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