Summary
Although a number of studies have been carried out on alkaline phosphatase (Al-P), this enzyme has not definitely been detected in synapses at the electron-microscopic level. Recently, we have successfully demonstrated, by perfusing specimens with 1% glutaraldehyde for fixation for as short a time as 8–10 min, that Al-P activity is localized on the presynaptic and postsynaptic membranes of the rat central nervous system (CNS). There were four types of presynaptic membrane: (1) those with the activity only on the membrane, (2) those with the activity only on the synaptic vesicle membrane, (3) those with the activity on both the presynaptic membrane and the synaptic vesicle membrane, and (4) those entirely free of the activity. The postsynaptic membranes were classified into two varieties: (1) those with the activity in the postsynaptic membrane and the postsynaptic thickening, and (2) those entirely without the activity. Thus, the occurrence of the enzyme activity assumed various combinations of presynaptic and postsynaptic involvement. The incidence of synapses either with presynaptic or postsynaptic activity varied distinctly from site to site.
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Sugimura, K., Mizutani, A. Histochemical and cytochemical studies of alkaline phosphatase activity in the synapses of rat brain. Histochemistry 61, 123–129 (1979). https://doi.org/10.1007/BF00496524
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DOI: https://doi.org/10.1007/BF00496524