Overlap in signaling between Smoothened and the α subunit of the heterotrimeric G protein G13

PloS One
Xueshui GuoDavid R Manning

Abstract

The Hedgehog family of morphogens has long been known to utilize, through the 7-transmembrane protein Smoothened (Smo), the heterotrimeric G protein Gi in both canonical and noncanonical forms of signaling. Other G proteins, while not specifically utilized by Smo, may nonetheless provide access to some of the events controlled by it. We reported several years ago that the G protein G13 activates one or more forms of the Gli family of transcription factors. While the Gli transcription factors are well known targets for Smo, the uncertain mechanism of activation by G13 and the identity of the targeted Gli(s) limited predictions as to the extent to which G13 might mimic Smo's actions. We evaluate here the potential for overlap in G13 and Smo signaling using C3H10T1/2 and 3T3-L1 cells as models of osteogenesis and adipogenesis, respectively. We find in C3H10T1/2 cells that a constitutively active form of Gα13 (Gα13QL) increases Gli1 mRNA, as does a constitutively active form of Smo (SmoA1). We find as well that Gα13QL induces alkaline phosphatase activity, a marker of osteogenesis, albeit the induction is far less substantial than that achieved by SmoA1. In 3T3-L1 cells both Gα13QL and SmoA1 markedly suppress adipogenic differentia...Continue Reading

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Citations

Mar 30, 2019·Basic & Clinical Pharmacology & Toxicology·Gunnar Schulte, Paweł Kozielewicz
Oct 9, 2019·Molecular Pharmacology·Pawel KozielewiczGunnar Schulte

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Datasets Mentioned

BETA
GSE98841
GSE111669

Methods Mentioned

BETA
PCR
RNA-seq
transfect
fluorescence microscopy

Software Mentioned

BLAST
Limma
Smo

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