Virchows Archiv B

, 46:83 | Cite as

On the role of arachidonic acid metabolites in mast-cell mediated mitogenesis in the rat

  • Klas Norrby
  • Rolf G. G. Andersson


We investigated whether the mitogenic response induced by local mast-cell secretion in the rat mesentery was affected by suppression of phospholipase A2, lipoxygenase, or cyclooxygenase in arachidonic acid metabolism. Enzyme inhibitor was given in a single intravenous dose 5 min before intraperitoneal injection of the mast-cell secretagogue 48/80. Mepacrine, a phospholipase A2 inhibitor, suppressed the generation of both leukotrienes (SRS) and prostaglandins (PG), whereas the lipoxygenase inhibitor BW 755C reduced the generation of SRS, and the cyclooxygenase inhibitor indomethacin significantly suppressed the generation of PG. None of the enzyme inhibitors affected the basal mesenteric histamine content or histamine release in the mesentery after exposure to 48/80, and none of them affected mast-cell-mediated mitogenesis in the mesentery as judged by specific DNA activity and mitosis counting.

The stimulation of DNA synthesis and mitosis initiated by secreting mast cells is apparently not mediated or modulated by synthesis of leukotrienes, prostaglandins, or other known arachidonic acid metabolites.

Key words

Mast cells Mesentery Mitogenesis Arachidonate metabolites 


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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Klas Norrby
    • 1
  • Rolf G. G. Andersson
    • 1
  1. 1.Department of Pathology IIUniversity of LinköpingLinköpingSweden

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