Submembrane geography dictates GPCR signalling compartmentation and physiological function

Beta1-adrenergic receptors in cardiomyocyte T-tubular versus outer non-tubular membranes are strongly linked to distinct cAMP nanodomains, regulating contractility versus hypertrophy.

• Why it matters: GPCR signaling is known to be compartmentalized, but how the same receptor subtype at the same general location yields different functional outputs is unclear.
• What they did: Using nanoscale scanning ion conductance microscopy with local receptor activation and live-cell FRET imaging of the cAMP pathway, the study mapped receptor–cAMP nanodomain communication in cardiomyocytes.
• The result: The spatial coupling persisted in failing rodent and human hearts, and submembrane-specific beta-blockers targeting outer non-tubular membrane improved hypertrophy and remodeling without reducing contractility in vitro and in vivo.

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