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pubmed-article:4805010pubmed:abstractTextLight and electron microscope studies were conducted on the nature of the degenerative changes in amputated nerve fibers of cultured rat sensory ganglia and on the effects of media with differing calcium concentrations upon these changes. With glucose-enriched Eagle's media (MEM) containing 1.6 mM calcium, the amputated myelinated and unmyelinated axons undergo a progressive granular disintegration of their axoplasm with collapse and fragmentation of myelin sheaths between 6 and 24 h after transection. With MEM containing only 25-50 microM calcium, the granular axoplasmic degeneration does not occur in transected fibers and they retain their longitudinal continuity and segmental myelin ensheathment for at least 48 h. Addition of 6 mM EGTA to MEM (reducing the estimated Ca(++) below 0.3 microM) results in the structural preservation of both microtubules and neurofilaments within transected axons. A transient focal swelling of amputated axons occurs, however, in cultures with normal and reduced calcium. These observations suggest that an alteration in the permeability of the axolemma is a crucial initiating event leading to axonal degenerative changes distal to nerve transection. The loss of microtubules and neurofilaments and the associated granular alterations of the axoplasm in transected fibers appears to result from the influx of calcium into the axoplasm.lld:pubmed
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