Correlation Engine 2.0
Clear Search sequence regions


  • alkaloids (2)
  • carbazoles (2)
  • cell (1)
  • il 6 (7)
  • ileum (1)
  • ileus (7)
  • k252a (9)
  • male (1)
  • mast cell (7)
  • mcpt6 protein, rat (1)
  • NGF (11)
  • NGF receptor (1)
  • peritoneal mast cells (5)
  • protein rat (1)
  • rat (7)
  • receptor factor (2)
  • transit (3)
  • TrkA (2)
  • vitro (2)
  • Sizes of these terms reflect their relevance to your search.

    Stabilization of mast cell (MC) degranulation has been proposed to prevent postoperative ileus (POI). Nerve growth factor (NGF) mediates MC degranulation. The aim of the study was to evaluate whether NGF receptor antagonist K252a acts as a MC stabilizer in vitro and in vivo model of POI. Peritoneal mast cells (PMCs) were obtained from Sprague-Dawley rats and were incubated with K252a and exposed to NGF or Compound 48/80 (C48/80). MC degranulation was assessed by β-hexosaminidase assay. POI was induced in rats by intestinal manipulation (IM). Rats were pretreated with K252a (100 μg/kg sc) 20 min prior to POI induction. At 20 min after IM, release of rat mast cell protease 6 (RMCP-6) was evaluated in peritoneal lavage. At 24 h, intestinal transit (IT) and gastric emptying (GE) were evaluated. Ileal inflammation was assessed by myeloperoxidase (MPO) activity, expression of IL-6, NGF, TrkA, RMCP-2 and 6, and MC density within the full-thickness ileum. C48/80 and NGF evoked degranulation of PMCs in a dose-dependent manner. K252a prevented NGF-evoked, but not C48/80-evoked, MC degranulation. IM evoked the release of peritoneal RMCP-6 and subsequently delayed IT and GE. IM increased MPO activity and expression of IL-6. In IM rats, K252a prevented upregulation of IL-6 expression and reduced TrkA. IT, GE, and inflammation were not affected by K252a. K252a inhibited NGF-evoked degranulation of PMCs in vitro. In vivo, K252a decreased IL-6 and PMC degranulation. This may be of relevance for the development of new therapeutic targets for POI. Copyright © 2015 the American Physiological Society.

    Citation

    Sergio Berdún, Jakub Rychter, Patri Vergara. Effects of nerve growth factor antagonist K252a on peritoneal mast cell degranulation: implications for rat postoperative ileus. American journal of physiology. Gastrointestinal and liver physiology. 2015 Nov 15;309(10):G801-6

    Expand section icon Mesh Tags

    Expand section icon Substances


    PMID: 26405114

    View Full Text