In these frog synapses, calcium levels drop extremely quickly—within less than a millisecond—after calcium entry stops, mainly because calcium detaches from the inner surface of the cell membrane.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether phospholipid buffering is the dominant mechanism for rapid calcium decay across vertebrate synapses and whether time constants are conserved.
A systematic review and meta-analysis of all studies measuring calcium decay kinetics in vertebrate synapses using non-buffered methods (e.g., BK current, aequorin), comparing time constants and identifying dominant buffering mechanisms.
Whether selectively removing phospholipid calcium-binding sites slows calcium decay in Xenopus varicosities.
A double-blind experiment in Xenopus varicosities using phospholipase C to cleave phosphatidylserine head groups (calcium-binding sites) versus control, measuring [Ca²⁺]AZ decay kinetics via BK current in 50+ synapses with blinding to treatment.
Whether calcium decay kinetics accelerate during synaptic maturation in Xenopus.
A longitudinal cohort study measuring [Ca²⁺]AZ decay time constants in 80+ Xenopus varicosities from day 1 to day 14 post-culture using identical voltage protocols and BK current kinetics, with blinding to age.
Whether synapses with genetically altered phospholipid composition show slower calcium decay.
A case-control study comparing 25 Xenopus varicosities with CRISPR knockdown of phosphatidylserine synthase to 25 controls, measuring [Ca²⁺]AZ decay time constant via BK current kinetics under identical calcium influx protocols.
Whether calcium decay time constants are consistently ~0.6 ms across Xenopus varicosities at day 3 post-culture.
A cross-sectional measurement of [Ca²⁺]AZ decay time constants in 120+ Xenopus varicosities at day 3 post-culture using identical voltage protocols and exponential fitting of BK current decay, with blinding to measurement order.