Document Detail

Chain-dependent photocytotoxicity of tricationic porphyrin conjugates and related mechanisms of cell death in proliferating human skin keratinocytes.
MedLine Citation:
PMID:  20691164     Owner:  NLM     Status:  MEDLINE    
Photodynamic therapy (PDT) is a poor treatment option for nodular basal cell carcinomas and squamous cell carcinomas. As a result, the search for new photosensitizers with better effectiveness is of current interest. The photocytotoxicity of conjugates (P-R) of a water-soluble tri-cationic porphyrin (P-H) having similar efficiency of production of singlet oxygen, the PDT cytotoxin, has been assessed in vitro. Links between uptake, intracellular localization, photooxidative stress, photocytotoxicity and ability to induce programmed cell death are established. Conjugates bearing methyl (P-Me), Di-O-isopropylidene-(-d-galactopyranosyl (P-OGal) or N,N'-dicyclohexylureidooxycarbonyl (P-DDC) chains are efficiently taken-up by proliferating NCTC 2544 keratinocytes. The relative order of photocytotoxicity is P-OGal >P-DDC=P-Me≫P-H. The photocytotoxic potential of P-Me, P-OGal and P-DDC equals that of endogenous protoporphyrin IX induced by δ-aminolevulinic acid or its esters, the pro-drugs currently employed for PDT of skin lesions. Microfluorometry shows that P-Me, P-OGal, and P-DDC localize in endocytotic or pinocytotic vesicles but not in mitochondria or nucleus. Absence of annexin V binding, caspase activation or chromatin condensation suggests that cell photosensitization by P-R does not induce apoptosis. On the other hand, P-OGal photocytotoxicity correlates with appearance of multiple vesicles that have hallmarks of autophagy compartments, being decorated with the marker LC3 in cells transfected with an expression vector encoding GFP-LC3. p38 and JNK phosphorylation and inhibition of ERK1/2 phosphorylation suggest close relationship between mortality of NCTC 2544 keratinocytes and MAPK pathway impairment. Given their potentially easy formulation, water-soluble P-R are promising powerful photosensitizers for PDT of skin lesions.
João Nuno Silva; Antoine Galmiche; João P C Tomé; Agnès Boullier; Maria G P M S Neves; Eduarda M P Silva; Jean-Claude Capiod; José A S Cavaleiro; René Santus; Jean-Claude Mazière; Paulo Filipe; Patrice Morlière
Related Documents :
18463114 - Microglial cell death induced by glycated bovine serum albumin: nitric oxide involvement.
18801924 - Caveolin-1 regulates the secretion and cytoprotection of cyr61 in hyperoxic cell death.
12063564 - Cell death: apoptosis versus necrosis (review).
9202394 - Pathogen-induced programmed cell death in tobacco.
8920824 - Efficient rgd-independent entry process of coxsackievirus a9.
3092814 - Single step isolation of immunofluorescence-stained, viable lymphocytes by fluorescence...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-04
Journal Detail:
Title:  Biochemical pharmacology     Volume:  80     ISSN:  1873-2968     ISO Abbreviation:  Biochem. Pharmacol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-09-20     Completed Date:  2010-10-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0101032     Medline TA:  Biochem Pharmacol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1373-85     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Inc. All rights reserved.
Hospital de Santa Maria, Clinica Universitária de Dermatologia, Lisboa, Portugal.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Annexin A5 / analysis
Apoptosis / drug effects*
Autophagy / drug effects
Caspases / metabolism
Cells, Cultured
Keratinocytes / drug effects*
Microscopy, Fluorescence
Mitogen-Activated Protein Kinases / physiology
Oxidative Stress
Porphyrins / pharmacology*
Reg. No./Substance:
0/Annexin A5; 0/Porphyrins; EC Protein Kinases; EC 3.4.22.-/Caspases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  The Ski protein negatively regulates Siah2-mediated HDAC3 degradation.
Next Document:  Eicosapentaenoic acid improves hepatic steatosis independent of PPARalpha activation through inhibit...