Linked Life Data

1362921

Source:http://linkedlifedata.com/resource/pubmed/id/1362921

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1993-3-5
pubmed:abstractText
Several peptide growth factors can maintain survival or promote recovery of injured central neurons. In the present study, the effects of epidermal growth factor (EGF) and basic fibroblast growth factor (bFGF) on the toxicity produced by the dopaminergic neurotoxin, 1-methyl-4-phenylpyridinium (MPP+), were investigated in rat mesencephalic dopaminergic neurons in culture. High affinity [3H]DA uptake and morphometric analyses of tyrosine hydroxylase immunostained neurons were used to assess the extent of MPP+ toxicity, dopaminergic neuronal survival and growth of neurites. Consistent with previous reports, EGF and bFGF treatments stimulated neuritic outgrowth in dopaminergic neurons, increased DA uptake and enhanced their long-term survival in vitro. These growth factors also stimulated proliferation of astrocytes. The time course of EGF and bFGF effects on dopaminergic neurons coincided with the increase in glial cell density, suggesting that proliferation of glia mediates their trophic effects. Several findings from our study support this possibility. When MPP+ was applied to cultures at 4 days in vitro, before glial cells had proliferated, the damage to dopaminergic neurons was not affected by EGF or bFGF pretreatments. However, when cultures maintained in the presence of the growth factors for 10 days were exposed to MPP+, after they had become confluent with dividing glial cells, the MPP(+)-induced decreases in DA uptake and cell survival were significantly attenuated. Furthermore, when glial cell proliferation was inhibited by 5-fluoro-2'-deoxyuridine, the protective effects of EGF and bFGF against MPP+ toxicity were abolished. Continuous treatment of MPP(+)-exposed cultures with EGF or bFGF resulted in the stimulation of process regrowth of damaged dopaminergic neurons with concomitant recovery of DA uptake, suggesting that the injured neurons are able to respond to the trophic effects of EGF and bFGF. In summary, our study shows that the trophic effects of EGF and bFGF on mesencephalic dopaminergic neurons include protection from the toxicity produced by MPP+ and promotion of recovery of MPP(+)-damaged neurons. Stimulation of glial cell proliferation is necessary for these effects.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
18
pubmed:volume
599
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
83-97
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed-meshheading:1362921-1-Methyl-4-phenylpyridinium, pubmed-meshheading:1362921-Analysis of Variance, pubmed-meshheading:1362921-Animals, pubmed-meshheading:1362921-Biological Transport, pubmed-meshheading:1362921-Cell Survival, pubmed-meshheading:1362921-Cells, Cultured, pubmed-meshheading:1362921-Dopamine, pubmed-meshheading:1362921-Epidermal Growth Factor, pubmed-meshheading:1362921-Fetus, pubmed-meshheading:1362921-Fibroblast Growth Factor 2, pubmed-meshheading:1362921-Kinetics, pubmed-meshheading:1362921-Mesencephalon, pubmed-meshheading:1362921-Nerve Fibers, pubmed-meshheading:1362921-Neurites, pubmed-meshheading:1362921-Neurons, pubmed-meshheading:1362921-Neurotoxins, pubmed-meshheading:1362921-Rats, pubmed-meshheading:1362921-Rats, Sprague-Dawley, pubmed-meshheading:1362921-Time Factors, pubmed-meshheading:1362921-Tyrosine 3-Monooxygenase
pubmed:year
1992
pubmed:articleTitle
Protection from 1-methyl-4-phenylpyridinium (MPP+) toxicity and stimulation of regrowth of MPP(+)-damaged dopaminergic fibers by treatment of mesencephalic cultures with EGF and basic FGF.
pubmed:affiliation
Department of Neurology, Mount Sinai School of Medicine, New York, NY 10029.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't