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Knockout of the Trpc1 gene reveals that TRPC1 can promote recovery from anaphylaxis by negatively regulating mast cell TNF-α production.

Abstract：

:Antigen-mediated mast cell (MC) degranulation is the critical early event in the induction of allergic reactions. Transient receptor potential channels (TRPC), particularly TRPC1, are thought to contribute to such MC activation. To explore the contribution of TRPC1 in MC-driven allergic reactions, we examined antigen-mediated anaphylaxis in Trpc1⁻/⁻ and WT mice, and TRPC1 involvement in the activation of MCs derived from the bone marrow (BMMCs) of these mice. In vivo, we observed a similar induction of passive systemic anaphylaxis in the Trpc1⁻/⁻ mice compared to WT controls. Nevertheless, there was delayed recovery from this response in Trpc1⁻/⁻ mice. Furthermore, contrary to expectations, Trpc1⁻/⁻ BMMCs responded to antigen with enhanced calcium signaling but with little defect in degranulation or associated signaling. In contrast, antigen-mediated production of TNF-α, and other cytokines, was enhanced in the Trpc1⁻/⁻ BMMCs, as were calcium-dependent events required for these responses. Additionally, circulating levels of TNF-α in response to antigen were preferentially elevated in the Trpc1⁻/⁻ mice, and administration of an anti-TNF-α antibody blocked the delay in recovery from anaphylaxis in these mice. These data thus provide evidence that, in this model, TRPC1 promotes recovery from the anaphylactic response by repressing antigen-mediated TNF-α release from MCs.

journal_name

Cell Calcium

journal_title

Cell calcium

authors

Medic N,Desai A,Olivera A,Abramowitz J,Birnbaumer L,Beaven MA,Gilfillan AM,Metcalfe DD

doi

10.1016/j.ceca.2013.02.001

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

315-26

issue

5-6

eissn

0143-4160

issn

1532-1991

pii

S0143-4160(13)00027-4

journal_volume

53

pub_type

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