Endoplasmic reticulum sequesters calcium in the squid giant axon

See allHide authors and affiliations

Science  22 Dec 1978:
Vol. 202, Issue 4374, pp. 1300-1303
DOI: 10.1126/science.725607


Axons were loaded with calcium, rapidly frozen, and freeze-substituted. The endoplasmic reticulum, in addition to mitochondria, contained calcium deposits, as indicated by electron probe x-ray microanalysis. Oxalate injected into living axons helped to preserve calcium-containing deposits during preparation for microscopy. It is concluded that the endoplasmic reticulum is a calcium-sequestering compartment in the squid giant axon.