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Statins Perturb Gβγ Signaling and Cell Behavior in a Gγ Subtype Dependent Manner
Mithila Tennakoon1, Dinesh Kankanamge1, Kanishka Senarath1
1Department of Chemistry and Biochemistry, The University of Toledo, Toledo, Ohio.
Molecular Pharmacology
|February 16, 2019
Summary
Statins disrupt G protein signaling by inhibiting prenylation, affecting cell behavior and GPCRs. This prenylation inhibition is Gγ subtype-dependent, offering insights into statin
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- Guanine nucleotide-binding proteins (G proteins) are key signal transducers regulating eukaryotic cell functions.
- G proteins are anchored to the plasma membrane via lipid prenylation, a process dependent on the mevalonate pathway.
- The mevalonate pathway is also targeted by cholesterol-lowering drugs (statins), but their precise effects on G protein signaling are unclear.
Purpose of the Study:
- To investigate how statins affect the subcellular distribution and signaling of G protein subunits (Gβγ dimer and Gαβγ heterotrimer).
- To determine the influence of statins on G protein-coupled receptor (GPCR)-mediated signaling and associated cellular behaviors.
- To assess the subtype-specific efficacy of statins in inhibiting G protein prenylation.
Main Methods:
- Utilized clinically used statins to inhibit the mevalonate pathway.
- Examined the impact of statins on the plasma membrane localization of Gβγ dimers and Gαβγ heterotrimers.
- Assessed alterations in GPCR-G protein signaling and cell behaviors in response to statin treatment.
- Evaluated the Gγ subtype-specific efficiency of statin-induced prenylation inhibition.
Main Results:
- Statins significantly disrupt the plasma membrane localization of the Gβγ dimer.
- GPCR-G protein signaling and related cell behaviors are perturbed by statin treatment.
- Statin efficacy in inhibiting prenylation is dependent on the Gγ subtype, with greater effect on farnesylated types.
- Gγ subtype distribution varies across cells and tissues, influencing statin effectiveness.
Conclusions:
- Statins interfere with G protein localization and signaling, impacting cell functions.
- Statin-induced prenylation inhibition is subtype-specific, offering a mechanism for their clinical effects.
- This study highlights the potential of statins to modulate specific GPCR-G protein signaling pathways.
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