Abstract
The amyloid precursor protein (APP) and presenilin-1 (PS-1) are not only of importance for the normal functioning of the various neurons, but also play central roles in the pathogenesis of Alzheimer’s disease (AD). Through the use of immunohistochemical and Western blot techniques, the bidirectional axonal transport of these proteins has been demonstrated in the sciatic nerve of adult rat. Double-ligation of the sciatic nerve for 6, 12 or 24 h was observed to cause a progressive accumulation of the 45 kDa presenilin-1 holoprotein and APPs with molecular masses of 116 and 94 kDa on both sites of the ligature. It is concluded that the functions of presenilin-1 and APPs are not restricted to the neuronal perikarya: they may carry information in both directions, from the cell body to the axon terminals and vice versa.
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