Linked Life Data

8951389

Source:http://linkedlifedata.com/resource/pubmed/id/8951389

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1997-3-11
pubmed:abstractText
Thalamic neuronal degeneration after neocortical lesions involve both anterograde and retrograde components. This study deals with the thalamic microglial response after neocortical aspiration lesions, using fluorogold fluorescent prelabeling, to identify retrogradely degenerating thalamocortical neurons, combined with histochemical or immunohistochemical staining of microglial cells. Adult male Wistar rats were injected with the retrograde fluorescent tracer fluorogold, in the right sensorimotor cortex (forepaw area) in order to retrogradely label thalamic neurons projecting to this area. After 1 week, the fluorogold injection site was removed by aspiration, axotomizing at the same time the thalamic projection neurons now retrogradely labeled with fluorogold. After 3, 7, 14, and 28 days the animals were killed and processed for nucleoside diphosphatase histochemistry or complement type 3 receptor immuno-histochemistry and class I and II major histocompatibility complex immunohistochemistry using OX42, OX18, and OX6 antibodies. The histological analysis showed a prominent and progressive nucleoside diphosphatase-, OX42-, and OX6-positive microglial cell response in the ventrolateral, posterior, and ventrobasal thalamic nuclei with ongoing retrograde and anterograde neuronal degeneration. Initially the reactive microglia had a bushy morphology and were succeeded by ameboid microglia and microglial cluster cells as the reaction progressed. However, in the reticular thalamic nucleus, which suffered exclusively anterograde neuronal degeneration, a different picture was seen with only bushy microglia. The neurons undergoing retrograde degeneration in the ventrolateral, posterior, and ventrobasal thalamic nuclei were retrogradely labeled by the fluorogold tracer. Individual nucleoside diphosphatase-, OX42-, or OX6-positive microglial cells extended long cytoplasmic processes surrounding fluorogold-labeled neurons and had in some cases apparently phagocytized these. Several microglial cells were thus double-labeled with nucleoside diphosphatase or OX42 and fluorogold. In addition, small nucleoside diphosphatase-positive, fluorogold-labeled perivascular cells were observed in the neocortex near the fluorogold-injected and ablated neocortical areas and in the ipsilateral thalamus. This study demonstrates: (1) that the microglial response to thalamic degeneration after neocortical lesion is graded with a limited reaction to the well-known massive anterograde axonal degeneration and a more extended reaction to the axotomy-induced retrograde cell death; and (2) that also perivascular cells and possibly macrophages may contribute to this reaction, as seen by uptake of fluorogold from axotomized neurons in the degenerating thalamic nuclei.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0014-4819
pubmed:author
pubmed:issnType
Print
pubmed:volume
112
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
203-12
pubmed:dateRevised
2009-11-11
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Microglial reactions to retrograde degeneration of tracer-identified thalamic neurons after frontal sensorimotor cortex lesions in adult rats.
pubmed:affiliation
Department of Neurobiology, Institute of Anatomy, University of Aarhus, Denmark.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't