title: Large defects of type I allergic response in telomerase reverse transcriptase knockout mice.
abstract: 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.
authors: Department of Basic Gerontology, National Institute for Longevity Sciences, Obu, Japan.
authors: Azusa
authors: A
authors: Ujike-Asai
authors: Aki
authors: A
authors: Okada
authors: Yuchen
authors: Y
authors: Du
authors: Mitsuo
authors: M
authors: Maruyama
authors: Xunmei
authors: X
authors: Yuan
authors: Fuyuki
authors: F
authors: Ishikawa
authors: Yoshiharu
authors: Y
authors: Motoo
authors: Kenichi
authors: K
authors: Isobe
authors: Hideo
authors: H
authors: Nakajima
mesh_terms: D000707:Anaphylaxis / Q000235:genetics* / Q000276:immunology* / Q000473:pathology; D000818:Animals; D005260:Female; D017353:Gene Deletion; D006632:Histamine / Q000097:blood; D006651:Histocytochemistry; D008297:Male; D008407:Mast Cells / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D019098:Telomerase / Q000032:analysis / Q000235:genetics*
chemical_list: D006632:Histamine; D019098:Telomerase; C509187:Tert protein, mouse