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PDGF‐A and PDGFR‐α regulate tooth formation via autocrine mechanism during mandibular morphogenesis in vitro
Author(s) -
Chai Yang,
Bringas Pablo,
Mogharei Ali,
Shuler Charles F.,
Slavkin Harold C.
Publication year - 1998
Publication title -
developmental dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.634
H-Index - 141
eISSN - 1097-0177
pISSN - 1058-8388
DOI - 10.1002/(sici)1097-0177(199812)213:4<500::aid-aja14>3.0.co;2-a
Subject(s) - autocrine signalling , biology , platelet derived growth factor receptor , microbiology and biotechnology , morphogenesis , platelet derived growth factor , growth factor , receptor , medicine , endocrinology , genetics , gene
Platelet‐derived growth factor A (PDGF‐A) binding to the PDGF receptor alpha (PDGFR‐α) mediates signal transduction processes related to DNA synthesis, cell migrations, cytodifferentiation, and wound healing. Recent studies indicate that PDGFR‐α functions during cranial neural crest cell migrations and first branchial arch morphogenesis (Stephenson et al. [1991] Proc. Natl. Acad. Sci. USA 88:6–10; Morrison‐Graham et al. [1992] Development 115:133–142; Hu et al. [1995] Int. J. Dev. Biol. 39:939–945; Soriano [1997] Development 124:2691–2700). The present studies were designed to test the hypothesis that PDGF‐A, interacts with its cognate receptor PDGFR‐α via an autocrine mechanism that regulates the timing, rates, and size of embryonic mouse tooth morphogenesis. Both PDGF‐A and PDGFR‐α transcripts were coordinately expressed in mandibular prominences prior to and during tooth formation using reverse transcriptase‐polymerase chain reaction (RT‐PCR). During the dental lamina stage, ligand and receptor were present in both enamel organ epithelium and adjacent mesenchymal cells. During the bud stage, ligand and receptor were localized mainly to the enamel organ epithelium. Exogenous PDGF‐A at 20 ng/ml enhanced tooth development to reach the cap stage with increased tooth size ( P < 0.05) using embryonic day (E)10 mandibular explants cultured in serumless, chemically defined medium. A significant increase in DNA synthesis was observed within enamel organ epithelium at E10+4 when the mandibular explants were treated with PDGF‐A at 20 ng/ml. These data suggest that PDGF‐A and its cognate receptor (PDGFR‐α) regulate the size and stage of tooth development via an autocrine mechanism during odontogenesis in vitro. Dev. Dyn. 1998;213:500–511. © 1998 Wiley‐Liss, Inc.