Linked Life Data

7638255

Source:http://linkedlifedata.com/resource/pubmed/id/7638255

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1995-9-11
pubmed:abstractText
The subcellular localization of protoporphyrin (PP) has been studied by microspectrofluorometric techniques in NCTC 2544 keratinocytes incubated with 5-aminolevulinic acid (ALA) for times up to 42 h. Whereas the plasma membrane shows strong staining, fluorescent spots are observed within the cytoplasm especially in the perinuclear region. Although the topographic pattern of the PP distribution does not change much with the incubation time with ALA, the fluorescence spectra suggest that the PP microenvironments are quite different at short and long incubation times. Addition of 18 microM desferrioxamine almost doubles the ALA-induced PP concentration. Colocalization experiments with rhodamine 123, a mitochondrial probe, and lucifer yellow (LY) or neutral red (NR), two lysosome probes, demonstrate that at least some of these spots are of lysosomal origin. Study of the time evolution of the NR fluorescence under irradiation with visible light in the presence and absence of ALA demonstrates that lysosomes are damaged cells that have synthesized PP. No PP fluorescence can be detected in mitochondria after incubation with ALA. However, photosensitization of mitochondria occurs under irradiation with visible light. Very little formation of lipofuscins by photosensitization with exogenous PP or ALA-induced PP is observed with the NCTC 2544 keratinocytes, as compared to normal human fibroblasts.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0031-8655
pubmed:author
pubmed:issnType
Print
pubmed:volume
62
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
114-22
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Subcellular localization of and photosensitization by protoporphyrin IXhuman keratinocytes and fibroblasts cultivated with 5-aminolevulinic acid.
pubmed:affiliation
Muséum National d'Histoire Naturelle, Laboratoire de Physico-Chimie de l'Adaptation Biologique (INSERM U 312), Paris, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't