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Int J Radiat Biol. 2007 Aug;83(8):535-41.

Ionizing radiation induces degranulation of human mast cells and release of tryptase.

Author information

1
Anatomisches Institut am Biederstein, Ludwig-Maximilians-Universität, Munich, Germany.

Abstract

PURPOSE:

Skin fibrosis is a hallmark of ionizing radiation-induced tissue injury and we hypothesized that mast cells via their products (especially tryptase) are involved in this event. We therefore investigated whether: (i) irradiation with 5 Gray (Gy) is able to induce the release of the typical mast cell mediator tryptase from human mast cells (HMC-1) in vitro, (ii) this effect can be influenced by application of clinically relevant mast cell blockers, and (iii) irradiation leads to mast cell degranulation in ex vivo skin culture models.

MATERIALS AND METHODS:

The human mast cell line (HMC)-1, as well as ex vivo skin tissue served as experimental models. Fluorescence activated cell sorting (FACS), Enzyme linked immunosorbent assays (ELISA), mast cell degranulation assays and immunohistochemistry were applied.

RESULTS:

Ionizing radiation induces a time-dependent, statistically significant increase in the release of tryptase by HMC-1 cultured in vitro. Mast cell degranulation and secretion of tryptase was partially, but not significantly, inhibited by pre-incubation with the histamine-1 receptor (H1) blocker cetirizine. Mast cell degranulation was also clearly evident after irradiation using an ex vivo skin culture model of mastocytoma tissue.

CONCLUSIONS:

We propose that ionizing radiation leads to a degranulation of dermal mast cells, an event which is accompanied by the release of tryptase.

PMID:
17613126
DOI:
10.1080/09553000701444657
[Indexed for MEDLINE]

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