title: Age-induced reprogramming of mast cell degranulation.
abstract: Mast cell degranulation can initiate an acute inflammatory response and contribute to the progression of chronic diseases. Alteration in the cellular programs that determine the requirement for mast cell degranulation would therefore have the potential to dramatically impact disease severity. Mast cells are exposed to increased levels of PGE2 during inflammation. We show that although PGE2 does not trigger the degranulation of dermal mast cells of young animals, in older mice, PGE2 is a potent mast cell stimulator. Intradermal administration of PGE2 leads to an EP3 receptor-dependent degranulation of mast cells, with the number of degranulated cells approaching levels observed in IgE- and Ag-treated controls. Taken together, these studies suggest that the ability of PGE2 to initiate mast cell degranulation changes in the aging animal. Therefore, elevated PGE2 levels might provide an important pathway by which mast cells are engaged to participate in inflammatory responses in the elderly patient.
authors.affiliation: Department of Genetics, University of North Carolina, Chapel Hill, NC 27599, USA.
authors.forename: Mytrang
authors.initials: M
authors.lastname: Nguyen
authors.forename: Amy J
authors.initials: AJ
authors.lastname: Pace
authors.forename: Beverly H
authors.initials: BH
authors.lastname: Koller
mesh_terms: D000367:Age Factors; D000527:Alprostadil / Q000494:pharmacology; D000818:Animals; D015550:Cell Degranulation; D003872:Dermatitis / Q000209:etiology; D004487:Edema / Q000209:etiology; D007073:Immunoglobulin E / Q000276:immunology; D008407:Mast Cells / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D010323:Passive Cutaneous Anaphylaxis / Q000276:immunology; D018078:Receptors, Prostaglandin E / Q000502:physiology; D058306:Receptors, Prostaglandin E, EP1 Subtype; D058308:Receptors, Prostaglandin E, EP3 Subtype
chemical_list: C545636:Ptger1 protein, mouse; C545648:Ptger3 protein, mouse; D018078:Receptors, Prostaglandin E; D058306:Receptors, Prostaglandin E, EP1 Subtype; D058308:Receptors, Prostaglandin E, EP3 Subtype; D007073:Immunoglobulin E; D000527:Alprostadil