title: A subcellular distribution of estrogen receptor-alpha is changed during artificially induced senescence of PC12 pheochromocytoma cells.
abstract: Although estrogen has been considered as a sex hormone for decades, recent reports suggest that estrogen might modulate the development and physiological function of the brain. In addition, the subcellular localization of estrogen receptors (ERs) has shown their presence within both the perinuclear cytoplasm and nuclei, suggesting that these ERs may differ functionally. We, therefore, assayed changes in the subcellular localization of ER-alpha immunoreactivity (IR) in rat pheochromocytoma PC12 cells during the artificial senescence induced by the telomerase inhibitor, 3'-azido-3'-deoxythymidine (AZT). After 2 months of culture with AZT, PC12 cells showed morphological and biochemical characteristics of cellular senescence. In the cells showing artificial senescence, the ER-alpha IR was mainly localized within the cytoplasm, whereas in control cells, ER-alpha IR was found only in the nuclei. Since senescence was induced by AZT, which inhibits the action of telomerase whenever the cells divide, the change in subcellular distribution of ER-alpha IR may be correlated with the length of the telomere.
authors.affiliation: Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Poongnap-dong, Songpa-gu, Seoul, South Korea.
authors.forename: Eunju
authors.initials: E
authors.lastname: Lee
authors.forename: Ga Hee
authors.initials: GH
authors.lastname: Mun
authors.forename: Chang Seok
authors.initials: CS
authors.lastname: Oh
authors.forename: Yoon Hee
authors.initials: YH
authors.lastname: Chung
authors.forename: Choong Lk
authors.initials: CL
authors.lastname: Cha
authors.forename: Young Soo
authors.initials: YS
authors.lastname: Lee
authors.forename: Dong Hoon
authors.initials: DH
authors.lastname: Shin
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000737:chemistry* / Q000187:drug effects / Q000502:physiology; D016922:Cellular Senescence / Q000187:drug effects / Q000502:physiology*; D003593:Cytoplasm / Q000737:chemistry* / Q000187:drug effects / Q000502:physiology; D047628:Estrogen Receptor alpha / Q000032:analysis* / Q000502:physiology; D016716:PC12 Cells; D051381:Rats; D013347:Subcellular Fractions / Q000737:chemistry / Q000187:drug effects / Q000502:physiology; D015215:Zidovudine / Q000633:toxicity
chemical_list: D047628:Estrogen Receptor alpha; D015215:Zidovudine