Summary
Structural changes in neurons in the cervical anterior horn of ageing mice have been studied. The main age-related neurocytological change observed during this study is progressive accumulation of lipofuscin. The pigment was present in some nerve cells as early as six weeks after birth. Various types of membrane-bound granules encountered in the anterior horn cells were characterized on the basis of their shape, size and fine structure into primary lysosome-like (L1) granules (dense bodies), autophagic vacuole-like (L2) granules and mature (L3) pigment granules of complex substructure and irregular configuration.L1,L3 andL3 types of granules appear to represent respectively early, intermediate and mature stages in a developmental continuum of lipofuscin pigment granules. Transitional stages suggest that matureL3 pigment granules evolve by gradual alteration of lysosome-likeL1 andL2 granules. A probable sequence of morphologic events accompanying the transformation of lysosome-like granules into mature lipofuscin pigment granules is suggested.
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Sekhon, S.S., Maxwell, D.S. Ultrastructural changes in neurons of the spinal anterior horn of ageing mice with particular reference to the accumulation of lipofuscin pigment. J Neurocytol 3, 59–72 (1974). https://doi.org/10.1007/BF01111932
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DOI: https://doi.org/10.1007/BF01111932