Abstract
In a range of [Ca 2+] similar to cytosolic transient, a drastic reduction from about 20 dyn/cm to almost zero was observed in the membrane elastic modulus of bovine chromaffin granules, isolated in a solution containing 0.3 M sucrose and 5 mM Hepes at pH 7.0, and measured by combination of osmotic swelling and dynamic light-scattering (DLS) methods. This result suggests that the granule membrane becomes extremely flexible as a prelude to exocytosis.
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