Summary
Lysosomal activity at nodes of Ranvier of feline hindlimb alpha-motor neurons was examined by light and electron microscopical acid phosphatase (AcPase) histochemistry during retrograde axonal transport of intramuscularly injected horseradish peroxidase (HRP). Several nodes along the PNS parts of the alpha-motor axons of the HRP-injected side showed accumulations of AcPase-positive bodies in the constricted nodal axon segment and the adjacent paranodal axoplasm. Such lysosomal accumulations were most prominent in the ventral root and differed in number and intensity depending on survival time after the HRP injection. At nodes showing high AcPase activity the axoplasm proximal to the nodal midlevel was occupied by many small, AcPase-positive, vesiculotubular profiles. Larger AcPase-positive bodies were mainly situated distal to the nodal midlevel. Double incubation for demonstration of both HRP and AcPase activity showed similar accumulations of AcPase-positive bodies at some of the HRP-transporting nodes. The AcPase activity differed considerably between nodes exhibiting comparable levels of HRP-positivity. Many of the AcPase-positive bodies also contained HRP reaction product. At some HRP-positive nodes the number of AcPase-positive bodies situated in the paranodal axon-Schwann cell network was elevated when compared to nodes of the contralateral, control side. In contrast to the PNS nodes, the nodal occurrence and distribution of lysosomes in the CNS part of alpha-motor axons seemed not to be affected by HRP transport.
These observations support our previous proposal that nodes of Ranvier in the PNS parts of alpha-motor axons, in contrast to their CNS nodes, possess an ability to control passage of and initiate lysosomal degradation of axonally transported substances. Such an ability may provide a protective function to the motor neuron by restricting the intraneuronal transport of materials imbibed by the axon terminals outside the CNS.
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Gatzinsky, K.P., Berthold, C.H. Lysosomal activity at nodes of Ranvier during retrograde axonal transport of horseradish peroxidase in alpha-motor neurons of the cat. J Neurocytol 19, 989–1002 (1990). https://doi.org/10.1007/BF01186826
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DOI: https://doi.org/10.1007/BF01186826