title: Internally perfused Myxicola giant axons showing long-term survival.
abstract: An improved method for internally perfusing the Myxicola giant axon based on removing the axoplasm by dispersing it in KCl-KF salt solutions is described. Proteolytic enzymes are not introduced. With this improved method perfused preparations show long-term stability of their electrical properties and the ability to generate action potentials for many hours. Mean initial values for resting membrane potential, action potential amplitude, and peak inward current were -68 mV, 118 mV, and 3.62 mA/cm2, respectively. Mean resting membrane resistance was 75% of that in intact axons. In one series of voltage clamp experiments, perfused preparations remained excitable for a mean period of 5 1/2 h, but this period could exceed 10 h. 4 min are needed for exchange of internal solutions. At least 50 mM KF is required both in the axoplasm liquefying solution and in the standard perfusate to obtain stable preparations.
mesh_terms: D000200:Action Potentials; D000818:Animals; D001369:Axons / Q000502:physiology*; D002470:Cell Survival; D007700:Kinetics; D008564:Membrane Potentials; D010477:Perfusion; D011077:Polychaeta
references.citation: Biophys J. 1975 May;15(5):495-9
references.pmid: 19211020
references.citation: J Physiol. 1978 May;278:309-24
references.pmid: 671305
references.citation: J Physiol. 1978 Mar;276:103-25
references.pmid: 650429
references.citation: J Physiol. 1974 Oct;242(2):471-87
references.pmid: 4455829
references.citation: J Physiol. 1975 Dec;253(1):303-19
references.pmid: 1260
references.citation: J Gen Physiol. 1976 Sep;68(3):327-40
references.pmid: 956090
references.citation: J Gen Physiol. 1969 Dec;54(6):730-40
references.pmid: 5357190