Cell swelling enhances ligand-driven β-adrenergic signaling

Alexei Sirbu, Marc Bathe-Peters, Jothi L. M. Kumar, Asuka Inoue, Martin J. Lohse and Paolo Annibale ()
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Alexei Sirbu: Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC)
Marc Bathe-Peters: Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC)
Jothi L. M. Kumar: University of St Andrews
Asuka Inoue: Tohoku University
Martin J. Lohse: Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC)
Paolo Annibale: Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC)

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract G protein-coupled receptors’ conformational landscape can be affected by their local, microscopic interactions within the cell plasma membrane. We employ here a pleiotropic stimulus, namely osmotic swelling, to alter the cortical environment within intact cells and monitor the response in terms of receptor function and downstream signaling. We observe that in osmotically swollen cells the β2-adrenergic receptor, a prototypical GPCR, favors an active conformation, resulting in cAMP transient responses to adrenergic stimulation that have increased amplitude. The results are validated in primary cell types such as adult cardiomyocytes, a model system where swelling occurs upon ischemia-reperfusion injury. Our results suggest that receptors’ function is finely modulated by their biophysical context, and specifically that osmotic swelling acts as a potentiator of downstream signaling, not only for the β2-adrenergic receptor, but also for other receptors, hinting at a more general regulatory mechanism.

Date: 2024
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DOI: 10.1038/s41467-024-52191-y

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