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Spatial calcium buffering in saccular hair cells

¹Institute of Neuroscience, University of Oregon, Eugene 97403.

|May 6, 1993

Summary

Intracellular calcium-binding proteins play a crucial role in rapid calcium signaling. This study reveals a mobile calcium buffer in hair cells that significantly impacts synaptic transmission and electrical resonance.

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Area of Science:

Neuroscience
Cell Biology
Biophysics

Background:

Intracellular calcium ions (Ca2+) are vital for cellular processes, including synaptic transmission.
The role of cytoplasmic Ca2+ buffers in fast, localized Ca2+ signaling has been underestimated.
Previous assumptions suggested Ca2+ buffers are unimportant in rapid exocytosis and hair cell electrical resonance.

Purpose of the Study:

To investigate the function of intracellular calcium-binding proteins in rapid Ca2+ signaling.
To challenge the presumption that Ca2+ buffers are insignificant in fast calcium-mediated processes.
To elucidate the impact of cytoplasmic Ca2+ buffering on hair cell function.

Main Methods:

Utilized frog sacculus hair cells to study Ca2+ dynamics.
Investigated the presence and kinetics of mobile cytoplasmic Ca2+ buffers.
Quantified the reduction in presynaptic free Ca2+ and the spatial buffering effect.

Main Results:

Demonstrated millimolar concentrations of a mobile cytoplasmic Ca2+ buffer in frog sacculus hair cells.
Showed this buffer captures Ca2+ within microseconds of entry, reducing free Ca2+ by up to 60%.
Found that the buffer restricts high Ca2+ concentrations to < 250 nm from synaptic sites, influencing electrical resonance and synaptic transmission.

Conclusions:

Mobile cytoplasmic Ca2+ buffers are important in fast synaptic transmission and hair cell electrical resonance.
Calbindin-D28K or similar proteins may function as these mobile Ca2+ buffers.
Spatial buffering by these proteins significantly modulates Ca2+ signaling dynamics at the synapse.

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