Asynchronous transmitter release: control of exocytosis and endocytosis at the salamander rod synapse.
AUTOR(ES)
Rieke, F
RESUMO
1. We have studied exocytosis and endocytosis in the synaptic terminal of salamander rods using a combination of Ca2+ imaging, capacitance measurement and the photolysis of Ca2+ buffers. 2. The average cytoplasmic Ca2+ concentration at the dark resting potential was 2-4 microM. 3. An average cytoplasmic Ca2+ concentration of 2-4 microM maintained a high rate of continuous exocytosis and endocytosis. 4. Changes in the rate of exocytosis were followed in less than 0.7 s by compensatory changes in the rate of endocytosis. 5. Vesicle cycling in the rod synapse is specialized for graded transmission and differs from that previously described for synapses that release synchronized bursts of transmitter.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1158946Documentos Relacionados
- Rate of quantal transmitter release at the mammalian rod synapse.
- Two components of transmitter release at a central synapse.
- Divalent cations differentially support transmitter release at the squid giant synapse.
- Inhibitors of calcium buffering depress evoked transmitter release at the squid giant synapse.
- Role of calcium-activated potassium channels in transmitter release at the squid giant synapse.
