By Dr. David Gareth Jones (auth.)
ISBN-10: 3540090118
ISBN-13: 9783540090113
ISBN-10: 3642670695
ISBN-13: 9783642670695
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Extra resources for Some Current Concepts of Synaptic Organization
Sample text
Perhaps more likely is the possibility that the microtubules themselves are artefacts, representing fused vesicles. , 1975; Walters and Matus, 1975b), may have some bearing on this issue. Alternatively, if tubulin does exist in the presynaptic terminal, it may be in the form of free or membrane-associated subunits (Blitz and Fine, 1974). , 1971; Twomey and Samson, 1972). A synaptosomal location for tubulin does not by itself point to localization in the presynaptic terminal, as synaptosomes consist of a postsynaptic component in addition to the obvious presynaptic one (Jones, 1972, 1975).
Nevertheless, whatever concepts are utilized need to be as broad as possible. Secondly, the presynaptic terminal, including all its components and constituents, is a highly labile entity. Unfortunately, many ultrastructural approaches are ill-equipped to tackle such a system. More attention should be devoted to those approaches that can, even if in a limited fashion, take due account of dynamic events. What flows from these principles, therefore, is the need for caution in the techniques adopted for elucidating synaptic dynamics, as well as care in elaborating the inter-relationships of synaptic profIles.
A limitation of these fractionation techniques is their inability at present to isolate the presynaptic membrane, with its dense projections, from the remainder of the presynaptic terminal membrane on the one hand and from the cleft and postsynaptic thickening on the other. In the absence of such an approach, reliance has to be placed on a number of allied techniques. , 1971; Lagnado and Lyons, 1972). , 1974). In similar fashion, digestion of the synaptosomal lipid unit membrane by sodium deoxycholate also results in isolated postsynaptic junctional lattices with a major 53,000 molecular weight protein constituent (Matus and Walters, 1975; Walters and Matus, 1975a).
Some Current Concepts of Synaptic Organization by Dr. David Gareth Jones (auth.)
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