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Related Concept Videos

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
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Updated: Apr 11, 2026

One-channel Cell-attached Patch-clamp Recording
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Flow-sensitive K + channels link flow to piezo1/PI3K/Akt1 pathway.

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    Endothelial Kir2.1 is crucial for vascular function, linking the glycocalyx to flow signaling. Its loss impairs flow-induced vasodilation in hypertension and aging, but can be restored by Kir2.1 restoration.

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    Area of Science:

    • Vascular biology
    • Endothelial cell physiology
    • Mechanotransduction

    Background:

    • Endothelial response to blood flow is vital for vascular health and disease.
    • Endothelial Kir2.1 is known to be essential for flow-induced signaling and vasodilation.
    • The precise integration of Kir2.1 with other flow-sensing pathways was not fully understood.

    Purpose of the Study:

    • To elucidate the mechanistic role of endothelial Kir2.1 in flow-induced signaling pathways.
    • To investigate the integration of Kir2.1 with calcium influx channels (Piezo1, TRPV4) and the endothelial glycocalyx.
    • To determine the physiological relevance of Kir2.1 in conditions like hypertension and aging.

    Main Methods:

    • Real-time electrophysiological recordings during flow exposure.
    • Calcium (Ca 2+ ) imaging and pressure myography of resistance arteries.
    • Echocardiography and genetic manipulation of endothelial channels.

    Main Results:

    • Kir2.1 is essential for flow-induced PI3K and Akt1/eNOS phosphorylation, with myristoylated Akt1 bypassing this requirement.
    • Kir2.1 mediates flow-induced Ca 2+ influx via Piezo1 and TRPV4, but is not required for channel activation itself.
    • Flow activation of Kir2.1 depends on Syndecan1, linking the glycocalyx to downstream signaling; Kir2.1 is suppressed by Angiotensin-II and aging, impairing flow-induced vasodilation (FIV).

    Conclusions:

    • Kir2.1 acts as a key molecular linker between the endothelial glycocalyx, Piezo1-mediated calcium influx, and downstream signaling in mechanotransduction.
    • Loss of endothelial Kir2.1 function significantly contributes to impaired FIV in Angiotensin-II-induced hypertension and aging.
    • Restoring endothelial Kir2.1 can fully recover FIV in these pathological conditions.