Novel role for RbAp48 in tissue-specific, estrogen deficiency-dependent apoptosis in the exocrine glands |
| |
| Authors: | Ishimaru Naozumi Arakaki Rieko Omotehara Fumie Yamada Koichi Mishima Kenji Saito Ichiro Hayashi Yoshio |
| |
| Affiliation: | Department of Oral Molecular Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, 3 Kuramotocho, Tokushima 770-8504, Japan. |
| |
| Abstract: | Although tissue-specific apoptosis in the exocrine glands in estrogen-deficient mice may contribute to the development of autoimmune exocrinopathy, the molecular mechanism responsible for tissue-specific apoptosis remains obscure. Here we show that RbAp48 overexpression induces p53-mediated apoptosis in the exocrine glands caused by estrogen deficiency. RbAp48-inducible transfectant results in rapid apoptosis with p53 phosphorylation (Ser9) and alpha-fodrin cleavage. Reducing the expression of RbAp48 through small interfering RNA inhibits the apoptosis. Prominent RbAp48 expression with apoptosis was observed in the exocrine glands of C57BL/6 ovariectomized (OVX) mice but not in OVX estrogen receptor alpha(-/-), p53(-/-), and E2F-1(-/-) mice. Indeed, transgenic expression of the RbAp48 gene induced apoptosis in the exocrine glands but not in other organs. These findings indicate that estrogen deficiency initiates p53-mediated apoptosis in the exocrine gland cells through RbAp48 overexpression and exerts a possible gender-based risk of autoimmune exocrinopathy in postmenopausal women. |
| |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ |
|
