α-Hederin inhibits G protein-coupled receptor kinase 2-mediated phosphorylation of β2-adrenergic receptors.

Phytomedicine : International Journal of Phytotherapy and Phytopharmacology
Janka Schulte-MichelsHanns Häberlein

Abstract

Recently is has been shown that α- and β-hederin increase the β2-adrenergic responsiveness of alveolar type II cells (A549) and human airway smooth muscle cells (HASM), respectively, by inhibiting the internalization of β2-adrenergic receptors (β2AR) under stimulating conditions. Internalization of β2AR is initiated by phosphorylations of certain serines and threonines by cAMP dependent protein kinase A (PKA) and G protein-coupled receptor kinases (GRK). To evaluate the effect of α-hederin on PKA and GRK2 mediated phosphorylation of GFP-tagged β2AR. To study this process we performed In-Cell Western using isoprenaline stimulated HEK293 cells overexpressing β2AR as GFP fusion protein and specific antibodies against PKA (Ser345/346) and GRK2 (Ser355/356) phosphorylation sites. There was no effect found on the PKA mediated phosphorylation (n = 14) but we could show that α-hederin (1 µM, 12 h) significantly inhibits GRK2 mediated phosphorylation at Ser355/356 by 11 ± 5% (n ≥ 29, p ≤ 0.01) under stimulating conditions compared to the positive control. In Förster resonance energy transfer (FRET) experiments using the isolated kinases in solution α-hederin did not show any influence neither to GRK2 nor to PKA. Taken together, these re...Continue Reading

References

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Citations

May 12, 2018·Inflammopharmacology·Janka Schulte-MichelsSebastian Franken
Jan 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yue YangNing Li
Jul 20, 2021·Phytomedicine : International Journal of Phytotherapy and Phytopharmacology·Fabio MeurerSebastian Franken
Feb 27, 2018·Biomedicine & Pharmacotherapy = Biomédecine & Pharmacothérapie·Dongdong SunHaibo Cheng

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