title: 15-Deoxy-delta 12,14-prostaglandin J2 biphasically regulates the proliferation of mouse hippocampal neural progenitor cells by modulating the redox state.
abstract: The activity of neural progenitor cells (NPCs) is regulated by various humoral factors. Although prostaglandin (PG) D(2) is known to mediate various physiological brain functions such as sleep, its actions on NPCs have not been fully understood. In the process of investigating the effects of PGD(2) on NPCs, we found that 15-deoxy-Delta(12,14)-prostaglandin J(2) (15d-PGJ(2)), an endogenous metabolite of PGD(2), exhibits a novel regulation of the proliferation of NPCs derived from mouse hippocampus. 15d-PGJ(2) showed biphasic effects on epidermal growth factor-induced proliferation of NPCs; facilitation at low concentrations ( approximately 0.3 muM) and suppression at higher concentrations (0.5-10 microM) in vitro. 2-Chloro-5-nitrobenzanilide (GW9662), an inhibitor of peroxisome proliferator-activated receptor gamma, known to be a molecular target for 15d-PGJ(2), failed to abolish the effects of 15d-PGJ(2). 9,10-dihydro-15d-PGJ(2) (CAY10410), a structural analog of 15d-PGJ(2) lacking the electrophilic carbon in the cyclopentenone ring, did not show 15d-PGJ(2)-like actions. Treatment with 15d-PGJ(2) increased the levels of reactive oxygen species and decreased endogenous GSH levels. Furthermore, supplementation with a membrane-permeable analog of glutathione, GSH ethyl ester (2 mM), diminished the biphasic effects of 15d-PGJ(2). Finally, cell division in the dentate gyrus of postnatal mice was increased by injection of low-dose (1 ng i.c.v.) 15d-PGJ(2) and suppressed by high-dose (30 ng) 15d-PGJ(2). These results suggest that 15d-PGJ(2) regulates the proliferation of NPCs via its electrophilic nature, which enables covalent binding to molecules such as GSH.
authors.affiliation: Department of Cellular Signaling, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Katura
authors.forename: Takahiro
authors.initials: T
authors.lastname: Moriya
authors.forename: Norimichi
authors.initials: N
authors.lastname: Nakahata
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D004815:Epidermal Growth Factor / Q000494:pharmacology; D005260:Female; D005978:Glutathione / Q000032:analysis; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D006624:Hippocampus / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D010084:Oxidation-Reduction; D047495:PPAR gamma / Q000037:antagonists & inhibitors; D015230:Prostaglandin D2 / Q000031:analogs & derivatives* / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism*
chemical_list: C097240:15-deoxy-delta(12,14)-prostaglandin J2; D047495:PPAR gamma; D017382:Reactive Oxygen Species; D004815:Epidermal Growth Factor; D005978:Glutathione; D015230:Prostaglandin D2