By Dorothy Eve Oorschot, David Gareth Jones (auth.)
This cutting-edge overview hyperlinks the experimental facts right into a cohesive and demanding account of CNS regeneration. study findings are mentioned when it comes to their relevance to 1 (or extra) of 13 hypotheses focused on regeneration within the mammalian CNS. study findings reviewed contain: regeneration in constructing mammals and in submammalian vertebrates, using transplants and/or pharmacological remedies, in vitro experiences on neurotrophic and neurite selling components and their capability relevance to CNS regeneration in vivo, and in vitro stories at the different types of glial cells which may be answerable for bettering or suppressing axonal re-growth.
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Extra info for Axonal Regeneration in the Mammalian Central Nervous System: A Critique of Hypotheses
7) have relevance to a number of the hypotheses reviewed in Sect. l. It is not the aim of this section, however, to give a comprehensive review of the voluminous classical and modern literature dealing with regeneration and transplantation in the CNS. For this, the reader is directed to some of the important review articles (Clemente 1964; Kiernan 1979; Kromer 1983; Reier 1985). e. tropic) substances (Reinoso-Smirez 1983). Since peripheral nerve grafts inserted into the brain may attract regenerating central fibres, Tello, a co-worker of Cajal's, implanted degenerated pieces of sciatic nerve into the cerebrum and noted extensive growth of central fibres into the graft after 2 weeks (Clemente 1964).
1981). It is unlikely to reflect early synaptogenesis, since the transplanted optic nerve segments contain no neurons (Aguayo et al. 1981). Schwartz et al. (1985) argue that mammalian grafts are more restrictive than amphibian grafts, since regenerating fish optic nerve grafts or implants of substances originating from regenerating fish optic nerve induce synthesis of selective polypeptides by adult rabbit optic nerves. Protein synthesis by these latter nerves usually declines following injury (Schwartz et al.
Another finding of potential use is that intraventricular transplantation of SCG produces a subtle, focal gliosis (Rosenstein and Brightman 1979), while the 42 Fig. 19. Micrograph illustrating permeability of SCG transplants. HRP fills the SCG transplant (T) and exudes into the subjacent medulla. The vibratome sections passes obliquely through the central canal (*), which is surrounded by reaction product; 30 min circulation. TM B reaction; 3 months post-operative. x 40. Inset: 111m plastic section from an adjacent section shows HRP permeation in medulla neuropil.