title: [Retinoic acid as a regulator of planarian morphogenesis].
abstract: The effect of retinoic acid on regeneration of two species of asexual planarian races, Girardia tigrina and Schmidtea mediterranea, was studied. It was established that retinoic acids at physiological concentrations (10(-7)-10(-10) M) inhibit the regeneration of the head part of planarians but have no effect on tail blastema growth. It is shown that regeneration of the head part is inhibited as a result of arrest of the cell cycle of neoblasts, proliferating stem cells, during the transition from the G1/G0 to the S phase. Thus, the morphogenetic role of retinoic acids in planarians, primitive bilaterally symmetrical animals, has been demonstrated.
authors.forename: O N
authors.initials: ON
authors.lastname: Ermakova
authors.forename: A M
authors.initials: AM
authors.lastname: Ermakov
authors.forename: Kh P
authors.initials: KhP
authors.lastname: Tiras
authors.forename: V V
authors.initials: VV
authors.lastname: Lednev
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002453:Cell Cycle; D004305:Dose-Response Relationship, Drug; D009024:Morphogenesis / Q000187:drug effects*; D010932:Planarians / Q000378:metabolism*; D012038:Regeneration / Q000187:drug effects*; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D014212:Tretinoin