Linked Life Data

10482348

Source:http://linkedlifedata.com/resource/pubmed/id/10482348

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1999-10-18
pubmed:abstractText
The subcellular redistribution of protein kinase C family members (alpha, beta, gamma, delta, epsilon and zeta isoforms) was examined in response to treatment with 12-O-tetradecanoyl-phorbol-13 acetate (TPA) or nerve growth factor (NGF) in a synaptosomal-enriched P2 fraction from rat brain. Treatment with TPA affected members of the classical-PKC family (alpha, beta and gamma), resulting in a final loss of total protein of each isoenzyme. The kinetics of changes of members of the novel-PKC family are different, the delta isoform being translocated, but not down-regulated, while the epsilon isoform showing only a slight diminishing of immunoreactivity in the soluble and particulate fractions. The atypical-PKC zeta isoform was not translocated in response to TPA. Incubation with NGF induced a loss of immunoreactivity of the cytosolic alpha, beta and epsilon isoforms, but the membrane fractions of these isoforms were not appreciably affected. In contrast, a marked translocation from cytosol to membrane was observed in the case of the gamma and delta isoforms. The zeta isoform presented a slight translocation from the particulate fraction to the soluble fraction. Thus, the results show that the effects of TPA and NGF on PKC isoforms are not coincident in synaptosomes, the 6 isoform being activated and not down-regulated by both treatments, whereas the gamma isoform is only down-regulated in the case of TPA, but presents sustained translocation with NGF, indicating that PKC isoform-specific degradation pathways exist in synaptic terminals. The effects of NGF on PKC isoforms coexist with an increase in NGF-induced polyphosphoinositide hydrolysis, suggesting the participation of phospholipases.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0197-0186
pubmed:author
pubmed:issnType
Print
pubmed:volume
35
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
281-91
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
Differential action of nerve growth factor and phorbol ester TPA on rat synaptosomal PKC isoenzymes.
pubmed:affiliation
Departament de Bioquímica i de Biologia Molecular, Facultat de Medicina, Universitat Autònoma de Barcelona, Spain.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't