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Subcellular fractionation and distribution of cholinergic binding sites in fetal human brain

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Abstract

Conventional subcellular fractionation techniques have been applied to human fetal brain (13–15 weeks gestation) and the fractions have been characterized by assaying for marker enzymes, cholinergic binding sites and electron microscopy. Fractionation of the homogenate resulted in a nuclear pellet (P1), a crude mitochrondrial pellet (P2) and a supernatant (S2). Further resolution of the P2 fraction by density gradient centrifugation resulted in two bands at the gradient interfaces and a pellet. The P2 and subsequently the P2B fraction contained intact plasma membrane profiles as judged by the predominance of adenylate cyclase activity and the presence of occluded lactate dehydrogenase which constituted over 70% of the total activity in these fractions. Morphological examination of the gradient fractions revealed that the P2B fraction contains membrane bound structures which resembie synaptosomes prepared from neonatal rat brain. These structures have a granular matrix in which mitochondria and frequently, neurofilaments were observed. Very few synaptic vesicles were present and there was no evidence for post synaptic attachments. The cholinergic markers choline acetyltransferase, acetylcholinesterase and receptor sites defined by quinuclidinyl benzilate and α-bungarotoxin binding were enriched in fractions P2 and P2B which contained the bulk of nerve ending particles. This enriched preparation of fetal synaptosomes may be valuable for functional studies on pre-synaptic terminals in developing brain.

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Authors and Affiliations

  1. Department of Biochemistry, University of Bath, Claverton Down, BA2 7AY, Bath, Avon, England

    Jean Whyte, Roger Harrison, George G. Lunt & Susan Wonnacott

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  1. Jean Whyte
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  2. Roger Harrison
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  3. George G. Lunt
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  4. Susan Wonnacott
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Special Issue dedicated to Prof. Eduardo De Robertis.

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Whyte, J., Harrison, R., Lunt, G.G. et al. Subcellular fractionation and distribution of cholinergic binding sites in fetal human brain. Neurochem Res 11, 1011–1023 (1986). https://doi.org/10.1007/BF00965590

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