Basic characteristics of human lung mast cell desensitization

D. MacGlashan, L. M. Lichtenstein

Research output: Contribution to journalArticlepeer-review


Human lung parenchymal mast cells displayed both specific and nonspecific desensitization. The kinetics of both release and desensitization were ~3 times faster than human basophils, but a similar relationship between release and desensitization suggests similar biochemistries in basophils and mast cells. Arachidonic acid metabolite (PGD2 and LTC4) release was slower to desensitize (t( 1/2 ) of 8 min) than histamine release (t( 1/2 ) of 3 min), the ratio of which is similar to the ratio observed in basophils. Ionophore A23187-induced release was unaffected by desensitization to anti-IgE antibody, and calcium-45 uptake was inhibited by desensitization, suggesting that desensitization inhibits the early post-cross-linking 'influx' of calcium that is necessary for mediator release in mast cells. In contrast to the above similarities in basophil and mast cell desensitization, mast cell desensitization, unlike that of basophils, was not inhibited by diisopropylfluorophosphate.

Original languageEnglish (US)
Pages (from-to)501-505
Number of pages5
JournalJournal of Immunology
Issue number2
StatePublished - 1987

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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