title: Effects of retinol on the temporal expression of transforming growth factor-alpha mRNA in the embryonic mouse mandible.
abstract: Development of the mouse embryonic mandible from days 9 to 14 involves tissue interactions in the formation of bone, cartilage, salivary glands and teeth. Growth factors may play an important role in these interactions. Epidermal growth factor (EGF) mRNA expression has been characterized and its presence has been shown to be necessary for odontogenesis. In addition, retinol alters the pattern of dental lamina formation; this effect is correlated with an alteration of the expression of the mRNA for this mitogen (EGF). Transforming growth factor-alpha (TGF alpha) mRNA expression has now been characterized by polymerase chain reaction for this entire period of development (days 9-14). Although the mRNA is present at the same time as EGF (days 9 and 10 only), retinol does not alter the expression of this mitogen as it does EGF. This suggests that retinoids may act to control the proliferative pattern of the dental lamina through EGF expression and not TGF alpha expression, although mRNAs for both mitogens are present at the same time.
authors: Department of BioStructure and Function, University of Connecticut Health Center, Farmington 06032.
authors: J E
authors: JE
authors: Kronmiller
authors: W B
authors: WB
authors: Upholt
authors: E J
authors: EJ
authors: Kollar
mesh_terms: D000818:Animals; D004622:Embryo, Mammalian; D004848:Epithelium / Q000187:drug effects / Q000473:pathology; D015870:Gene Expression / Q000187:drug effects*; D008334:Mandible / Q000187:drug effects / Q000196:embryology; D051379:Mice; D009805:Odontogenesis / Q000187:drug effects / Q000235:genetics; D009924:Organ Culture Techniques; D012333:RNA, Messenger / Q000187:drug effects* / Q000235:genetics; D013997:Time Factors; D014158:Transcription, Genetic; D016211:Transforming Growth Factor alpha / Q000235:genetics* / Q000378:metabolism; D014801:Vitamin A / Q000494:pharmacology*
chemical_list: D012333:RNA, Messenger; D016211:Transforming Growth Factor alpha; D014801:Vitamin A