PROTEIN SYNTHESIS IN NEURONS AND GLIAL CELLS OF THE DEVELOPING RAT BRAIN: AN IN VIVO STUDY 1
dc.contributor.author | Johnson, D. E. | en_US |
dc.contributor.author | Sellinger, Otto Z. | en_US |
dc.date.accessioned | 2010-04-01T15:29:13Z | |
dc.date.available | 2010-04-01T15:29:13Z | |
dc.date.issued | 1971-08 | en_US |
dc.identifier.citation | Johnson, D. E.; Sellinger, O. Z. (1971). "PROTEIN SYNTHESIS IN NEURONS AND GLIAL CELLS OF THE DEVELOPING RAT BRAIN: AN IN VIVO STUDY 1 ." Journal of Neurochemistry 18(8): 1445-1460. <http://hdl.handle.net/2027.42/65968> | en_US |
dc.identifier.issn | 0022-3042 | en_US |
dc.identifier.issn | 1471-4159 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/65968 | |
dc.identifier.uri | http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=4937302&dopt=citation | en_US |
dc.description.abstract | A technique for the isolation of pure neuronal perikarya and intact glial cells from cerebral cortex has been developed for routine use. The yield of neuronal perikarya and glial cells was greater from highly immature (5–10 days) rat cerebral cortex than from the cortex of older rats (18–43 days). The perikarya/glia yield ratio decreased with age indicating that, as the glial population matured, the procedure succeeded in isolating a gradually smaller proportion of the existing neurons. The perikarya/glia ratio was highest for the 5-day-old cortex in which no mature glial cells could be identified. After a 10-min pulse in vivo of intrathecally injected [ 14 C]phenylalanine, the specific radioactivity of the neuronal proteins was higher than that of the glial proteins in the 5-, 10- and 18-day-old rat but was lower in the 43-day-old rat. The values for absolute specific radioactivity of the 14 C-labelled proteins in both cell types were greater, the younger the brain. The 14 C-labelling of neuronal and glial proteins in the 18-day-old rat was assessed in vivo as a function of time by determining the incorporation of [ 14 C]phenylalanine into such proteins at 5, 10, 20 and 45 min after administration of the amino acid. The rate of incorporation of [ 14 C]phenylalanine into the glial cells was faster than into the neurons since higher specific radioactivities of the glial proteins could be achieved at earlier times. Also, a biphasic pattern of 14 C-labelling of the glial proteins was noted, suggesting, perhaps, a sequential involvement of the oligodendrocytes and astrocytes. Homogenates of prelabelled neuronal perikarya were fractionated into the nuclear, mitochondrial microsomal and soluble cell sap fractions. In the 18-day-old cerebral cortex, the proteins of the microsomal fraction exhibited the highest specific radioactivity at the end of 10 min, whereas by 20 min proteins of the mitochondrial fraction were most highly labelled. The specific radioactivity of the nuclear proteins increased over the entire 45-min experimental period. On the contrary, the proteins of the soluble cell sap, in which the specific radioactivity was at all times by far the lowest, were maximally labelled by 5 min. Examination of the labelling of the neuronal subcellular fractions as a function of age revealed that at 10 min after administration of [ 14 C]phenylalanine, the specific radioactivities of all 14 C-labelled proteins were highest in the youngest (5-day-old) neurons. The proteins of the microsomal fraction were most rapidly labelled at all ages. During this interval the proteins of the soluble cell sap were only moderately labelled in the 5-day-old neurons and were totally unlabelled in the 43-day-old neurons, indicating age-dependent differences in the rate of utilization of the amino acid precursor by the neurons. | en_US |
dc.format.extent | 2823679 bytes | |
dc.format.extent | 3110 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Blackwell Publishing Ltd | en_US |
dc.rights | 1971 International Society for Neurochemistry Ltd. | en_US |
dc.title | PROTEIN SYNTHESIS IN NEURONS AND GLIAL CELLS OF THE DEVELOPING RAT BRAIN: AN IN VIVO STUDY 1 | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Neurosciences | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Mental Health Research Institute, The University of Michigan Medical Center, Ann Arbor, Michigan | en_US |
dc.identifier.pmid | 4937302 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/65968/1/j.1471-4159.1971.tb00007.x.pdf | |
dc.identifier.doi | 10.1111/j.1471-4159.1971.tb00007.x | en_US |
dc.identifier.source | Journal of Neurochemistry | en_US |
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dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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