Anaphylaxis Research Today is a free monthly online journal that collates and summarizes the latest research about Anaphylaxis, including details on food allergies, diagnosis, treatment, causes.

Large defects of type I allergic response in telomerase reverse transcriptase knockout mice.

Ujike-Asai A, Okada A, Du Y, Maruyama M, Yuan X, Ishikawa F, Motoo Y, Isobe K, Nakajima H

Department of Basic Gerontology, National Institute for Longevity Sciences, Obu, Japan.

Telomerase is critically important for the maintenance of a constant telomere length, which in turn, is related to the concepts of longevity and oncogenesis. In addition, it has been well documented that telomerase activity is expressed in immune cells in a highly regulated manner. We have studied systemic anaphylaxis in mouse telomerase reverse transcriptase knockout (mTERT(-/-)) mice to understand the significance of telomerase activity and telomere stability in mast cells, which induce a type I allergic response. Compared with wild-type mice, mTERT(-/-) mice displayed largely attenuated, IgE-mediated, passive anaphylactic responses, which were observed even in the early generations of mTERT(-/-) mice, and had decreased numbers of mast cells in vivo and impaired development of bone marrow-derived mast cells (BMMCs) induced by IL-3 or stem cell factor in vitro. Moreover, in mTERT(-/-) mice, BMMCs exhibited a large morphology and low proliferation rate, while they possessed a comparable degranulation capacity and cell surface expression level of c-kit and FcepsilonRI. These findings imply that telomerase activity has a definitive impact on the type I allergic response by altering the character of effecter mast cells.

Published 30 July 2007 in J Leukoc Biol, 82(2): 429-35.
Full-text of this article is available online (may require subscription).

© 2005-2008 Anaphylaxis Research Today. All Rights Reserved.