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Pis Diez CM, Fernandez JF, Di Venosa G, Casas A, Pis Diez R, Palermo JA. One-step preparation of novel 1-( N-indolyl)-1,3-butadienes by base-catalysed isomerization of alkynes as an access to 5-( N-indolyl)-naphthoquinones. RSC Adv 2018; 8:35998-36006. [PMID: 35558441 PMCID: PMC9088550 DOI: 10.1039/c8ra05208e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 10/15/2018] [Indexed: 01/31/2023] Open
Abstract
A series of novel 1-(N-indolyl)-1,3-butadienes, as (1 : 1) mixtures of the (E) and (Z) dienes, was prepared in one step by base-catalysed isomerization of N-alkylindoles with a terminal butyne chain. The reaction conditions are mild, and in all cases the yields were very high (>90%). The (E) and (Z) dienes were separable by preparative TLC and could be fully characterized. This isomerization proceeded readily in the case of a butynyl chain, but didn't take place with a pentynyl chain. A mechanism was proposed for this reaction, based on previous studies on the isomerization of alkynes in basic media, and a key intermediate that supports the proposed mechanism could be isolated and fully characterized. A theoretical study of the proposed mechanism was performed by computational methods and the results validated the proposal. The reactivity of the synthesized dienes was studied in Diels–Alder reactions with p-benzoquinone, to obtain a small library of new 5-(N-indolyl)-1,4-naphthoquinones.The lack of reactivity in the case of the (Z) isomers was explained by calculation of the rotational curves of the central bond of the (Z) and (E) dienes. Finally, the cytotoxicity of the new 5-(N-indolyl)-1,4-naphthoquinones was tested against a panel of three cell lines. A series of novel 1-(N-indolyl)-1,3-butadienes, was easily prepared in one step and used for the synthesis of 5-(N-indolyl) naphthoquinones.![]()
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Affiliation(s)
- C. M. Pis Diez
- Universidad de Buenos Aires
- Departamento de Química Orgánica
- Facultad de Ciencias Exactas y Naturales
- Ciudad Universitaria
- Buenos Aires
| | - J. F. Fernandez
- Universidad de Buenos Aires
- Departamento de Química Orgánica
- Facultad de Ciencias Exactas y Naturales
- Ciudad Universitaria
- Buenos Aires
| | - G. Di Venosa
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP) CONICET and Hospital de Clínicas José de San Martin
- Universidad de Buenos Aires
- Ciudad de Buenos Aires, 1120AAF Buenos Aires
- Argentina
| | - A. Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP) CONICET and Hospital de Clínicas José de San Martin
- Universidad de Buenos Aires
- Ciudad de Buenos Aires, 1120AAF Buenos Aires
- Argentina
| | - R. Pis Diez
- CEQUINOR (CONICET-CCT-La Plata, UNLP)
- 1900 La Plata
- Argentina
| | - J. A. Palermo
- Universidad de Buenos Aires
- Departamento de Química Orgánica
- Facultad de Ciencias Exactas y Naturales
- Ciudad Universitaria
- Buenos Aires
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Mamone L, Ferreyra DD, Gándara L, Di Venosa G, Vallecorsa P, Sáenz D, Calvo G, Batlle A, Buzzola F, Durantini EN, Casas A. Photodynamic inactivation of planktonic and biofilm growing bacteria mediated by a meso-substituted porphyrin bearing four basic amino groups. J Photochem Photobiol B 2016; 161:222-9. [PMID: 27285813 DOI: 10.1016/j.jphotobiol.2016.05.026] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 05/15/2016] [Accepted: 05/30/2016] [Indexed: 01/02/2023]
Affiliation(s)
- L Mamone
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - D D Ferreyra
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, X5804BYA Río Cuarto, Córdoba, Argentina
| | - L Gándara
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - G Di Venosa
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - P Vallecorsa
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - D Sáenz
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - Gustavo Calvo
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - A Batlle
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - F Buzzola
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM), CONICET-UBA, Argentina
| | - E N Durantini
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, X5804BYA Río Cuarto, Córdoba, Argentina
| | - A Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina.
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Rodriguez L, Vallecorsa P, Battah S, Di Venosa G, Calvo G, Mamone L, Sáenz D, Gonzalez MC, Batlle A, MacRobert AJ, Casas A. Aminolevulinic acid dendrimers in photodynamic treatment of cancer and atheromatous disease. Photochem Photobiol Sci 2015; 14:1617-27. [DOI: 10.1039/c5pp00126a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ALA dendrimers are taken up by caveolae-mediated endocytosis in macrophages. Intracellular ALA release gives rise to PpIX synthesis and subsequent photosensitization of key cells in atheromas and tumour diseases.
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Affiliation(s)
- L. Rodriguez
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP). CONICET-Htal de Clínicas Gral. José de San Martín
- Ciudad de Buenos Aires
- Argentina
| | - P. Vallecorsa
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP). CONICET-Htal de Clínicas Gral. José de San Martín
- Ciudad de Buenos Aires
- Argentina
| | - S. Battah
- School of Biological Sciences
- University of Essex
- Wivenhoe Park CO4 3SQ
- UK
- Division of Surgery and Interventional Sciences and UCL Institute of Biomedical Engineering
| | - G. Di Venosa
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP). CONICET-Htal de Clínicas Gral. José de San Martín
- Ciudad de Buenos Aires
- Argentina
| | - G. Calvo
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP). CONICET-Htal de Clínicas Gral. José de San Martín
- Ciudad de Buenos Aires
- Argentina
| | - L. Mamone
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP). CONICET-Htal de Clínicas Gral. José de San Martín
- Ciudad de Buenos Aires
- Argentina
| | - D. Sáenz
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP). CONICET-Htal de Clínicas Gral. José de San Martín
- Ciudad de Buenos Aires
- Argentina
| | - M. C. Gonzalez
- Facultad de Ciencias Médicas
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP)
- CONICET-UNLP
- Argentina
| | - A. Batlle
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP). CONICET-Htal de Clínicas Gral. José de San Martín
- Ciudad de Buenos Aires
- Argentina
| | - A. J. MacRobert
- Division of Surgery and Interventional Sciences and UCL Institute of Biomedical Engineering
- University College London
- London W1W 7EJ
- UK
| | - A. Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP). CONICET-Htal de Clínicas Gral. José de San Martín
- Ciudad de Buenos Aires
- Argentina
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Gándara L, Sandes E, Di Venosa G, Prack Mc Cormick B, Rodriguez L, Mamone L, Batlle A, Eiján AM, Casas A. The natural flavonoid silybin improves the response to Photodynamic Therapy of bladder cancer cells. J Photochem Photobiol B 2014; 133:55-64. [PMID: 24705371 DOI: 10.1016/j.jphotobiol.2014.03.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 03/07/2014] [Accepted: 03/10/2014] [Indexed: 11/27/2022]
Abstract
Photodynamic Therapy (PDT) is an anticancer treatment based on photosensitisation of malignant cells. The precursor of the photosensitiser Protoporphyrin IX, 5-aminolevulinic acid (ALA), has been used for PDT of bladder cancer. Silybin is a flavonoid extracted from Silybum marianum, and it has been reported to increase the efficacy of several anticancer treatments. In the present work, we evaluated the cytotoxicity of the combination of ALA-PDT and silybin in the T24 and MB49 bladder cancer cell lines. MB49 cells were more sensitive to PDT damage, which was correlated with a higher Protoporphyrin IX production from ALA. Employing lethal light doses 50% (LD50) and 75% (LD75) and additional silybin treatment, there was a further increase of toxicity driven by PDT in both cell lines. Using the Chou-Talalay model for drug combination derived from the mass-action law principle, it was possible to identify the effect of the combination as synergic when using LD75, whilst the use of LD50 led to an additive effect on MB49 cells. On the other hand, the drug combination turned out to be nearly additive on T24 cells. Apoptotic cell death is involved both in silybin and PDT cytotoxicity in the MB49 line but there is no apparent correlation with the additive or synergic effect observed on cell viability. On the other hand, we found an enhancement of the PDT-driven impairment of cell migration on both cell lines as a consequence of silybin treatment. Overall, our results suggest that the combination of silybin and ALA-PDT would increase PDT outcome, leading to additive or synergistic effects and possibly impairing the occurrence of metastases.
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Affiliation(s)
- L Gándara
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - E Sandes
- Area Investigaciones, Instituto de Oncología Ángel H. Roffo, Argentina
| | - G Di Venosa
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | | | - L Rodriguez
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - L Mamone
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - A Batlle
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina
| | - A M Eiján
- Area Investigaciones, Instituto de Oncología Ángel H. Roffo, Argentina
| | - A Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Córdoba 2351 1er subsuelo, Ciudad de Buenos Aires CP1120AAF, Argentina.
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Mamone L, Di Venosa G, Gándara L, Sáenz D, Vallecorsa P, Schickinger S, Rossetti M, Batlle A, Buzzola F, Casas A. Photodynamic inactivation of Gram-positive bacteria employing natural resources. Journal of Photochemistry and Photobiology B: Biology 2014; 133:80-9. [DOI: 10.1016/j.jphotobiol.2014.03.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 02/26/2014] [Accepted: 03/06/2014] [Indexed: 10/25/2022]
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Di Venosa G, Rodriguez L, Mamone L, Gándara L, Rossetti M, Batlle A, Casas A. Changes in actin and E-cadherin expression induced by 5-aminolevulinic acid photodynamic therapy in normal and Ras-transfected human mammary cell lines. Journal of Photochemistry and Photobiology B: Biology 2012; 106:47-52. [DOI: 10.1016/j.jphotobiol.2011.10.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 10/06/2011] [Accepted: 10/08/2011] [Indexed: 10/16/2022]
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Mamone L, Di Venosa G, Valla JJ, Rodriguez L, Gándara L, Batlle A, Heinrich M, Juarranz A, Sanz-Rodriguez F, Casas A. Cytotoxic effects of Argentinean plant extracts on tumour and normal cell lines. Cell Mol Biol (Noisy-le-grand) 2011; 57 Suppl:OL1487-OL1499. [PMID: 21624335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2011] [Accepted: 05/12/2011] [Indexed: 05/30/2023]
Abstract
In the search for possible new anti-cancer agents, we investigated the effects of 75 aqueous and methanol extracts from 41 Argentinean plant species. The effect in cell growth was evaluated in the LM2 mammary adenocarcinoma cells. In a second stage, the highly active selected extracts were assayed in 3 other tumour cell lines: melanoma B16, bladder MB49 and lung A549; and 3 normal cell lines: mammary Hb4a and keratinocytes PAM212 and HaCat. Eight methanol extracts were found to be highly cytotoxic: Collaea argentina leaf, Iochroma australe leaf, Ipomoea bonariensis flower, Jacaranda mimosifolia flower, Solanum amygdalifolium flower, Solanum chacoense leaf, Solanum sisymbriifolium flower and Solanum verbascifolium flower. However, extract inhibition on cell growth was highly dependent on cell type. In general, except for the highly resistant cell lines, the inhibitory concentrations 50% were in the range of 10-150 μg/ml The eight extracts highly inhibited cell growth in a concentration-dependent manner, and in general the methanol extracts were always more active than the aqueous. Murine cells appear to be more sensitive than human cells to the cytotoxic action of the plant extracts. The human melanoma B16 line was the most resistant to four of the extracts. In terms of selectivity, S. verbascifolium was the species which showed most selectivity for tumour cells. Overall, this is one of the first studies focusing on southern South American native plants and their biological effects. Since some species of 5 genera analyzed have been reported to possess different degrees of alkaloid content, we examined microtubule structures after extract treatments. The eight extracts induced destabilization, condensation and aggregation of microtubules in LM2 cells, although no depolarization, typical of Vinca alkaloids damage was observed. In a near future, antitumour activity of purified fractions of the extracts administered at non-toxic doses will be assayed in transplantable murine tumour models.
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Affiliation(s)
- L Mamone
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Ciudad de Buenos Aires, Argentina
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Abstract
Photodynamic therapy (PDT) involves the administration of a photosensitizer (PS) followed by illumination with visible light, leading to generation of reactive oxygen species. The mechanisms of resistance to PDT ascribed to the PS may be shared with the general mechanisms of drug resistance, and are related to altered drug uptake and efflux rates or altered intracellular trafficking. As a second step, an increased inactivation of oxygen reactive species is also associated to PDT resistance via antioxidant detoxifying enzymes and activation of heat shock proteins. Induction of stress response genes also occurs after PDT, resulting in modulation of proliferation, cell detachment and inducing survival pathways among other multiple extracellular signalling events. In addition, an increased repair of induced damage to proteins, membranes and occasionally to DNA may happen. PDT-induced tissue hypoxia as a result of vascular damage and photochemical oxygen consumption may also contribute to the appearance of resistant cells. The structure of the PS is believed to be a key point in the development of resistance, being probably related to its particular subcellular localization. Although most of the features have already been described for chemoresistance, in many cases, no cross-resistance between PDT and chemotherapy has been reported. These findings are in line with the enhancement of PDT efficacy by combination with chemotherapy. The study of cross resistance in cells with developed resistance against a particular PS challenged against other PS is also highly complex and comprises different mechanisms. In this review we will classify the different features observed in PDT resistance, leading to a comparison with the mechanisms most commonly found in chemo resistant cells.
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Affiliation(s)
- A Casas
- Centro de Invesigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clinicas José de San Martin, University of Buenos Aires Córdoba 2351 ler subsuelo, Argentina.
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Casas A, Di Venosa G, Batlle A, Fukuda H. In vitro photosensitisation of a murine mammary adenocarcinoma cell line with Verteporfin. Cell Mol Biol (Noisy-le-grand) 2002; 48:931-7. [PMID: 12699253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Benzoporphyrin derivative monoacid ring A (BPD-MA) is a second generation hydrophobic photosensitiser for PDT that has been approved for ocular disease treatment. In the present paper we report the results of in vitro studies on the photosensitising activity of Verteporfin (liposomally formulated BPD-MA) using an adenocarcinoma derived cell line. Our findings show a quick and efficient uptake of Verteporfin by LM3 cells, reaching maxima concentrations after 5 hr exposure to 18 microg Verteporfin/ml. Independently on the concentration, plateau levels are attained 5 hr after exposure to Verteporfin. Exposure of the cells to the photosensitiser appears to be safe in the darkness within a broad range of concentrations. The hydroxyl radical scavenger mannitol afforded the highest protection against PDT, while L-tryptophan, a well known and efficient singlet oxygen quencher was not an effective protector at all, showing scavenging activity only when it was supplemented at concentration as high as 10 mM and when 50% of the cells were affected, showing that in addition to singlet oxygen, which is considered the primary cytotoxic agent in PDT, other interconvertible reactive oxygen specie (ROS), in particular HO are also generated. Verteporfin-PDT also induced morphological features typical of apoptotic cells. Results of the present work show that the LM3 adenocarcinoma cell can be effectively sensitised with Verteporfin-PDT.
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Affiliation(s)
- A Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias, FCEyN, University of Buenos Aires and CONICET, Ciudad Universitaria, Pabellón II, 2do piso, 1428 Buenos Aires, Argentina
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Abstract
The use of more lipophilic derivatives of 5-aminolevulinic acid (ALA) is expected to have better diffusing properties, and after conversion into the parent ALA, to reach a higher protoporphyrin IX (PPIX) formation rate, thus improving the efficacy of topical photodynamic therapy (PDT). Here we have analysed the behaviour of 3 ALA derivatives (ALA methyl-ester, hexyl ester and a 2-sided derivative) regarding PPIX formation, efficiency in photosensitizing cells and mechanism of cellular death. The maximum amount of porphyrins synthesized from 0.6 mM ALA was 47 +/- 8 ng/10(5)cells. The same amount was formed by a concentration 60-fold lower of hexyl-ALA and 2-fold higher of methyl-ALA. The 2-sided derivative failed to produce PPIX accumulation. Applying a 0.6 J cm(-2)light dose, cell viability decreased to 50%. With the 1.5 J cm(-2) light dose, less than 20% of the cells survive, and higher light doses produced nearly total cell killing. Comparing the PPIX production and the induced phototoxicity, the more the amount of porphyrins, the greater the cellular killing, and PPIX formed from either ALA or ALA-esters equally sensitize the cells to photoinactivation. ALA-PDT treated cells exhibited features of apoptosis, independently on the pro-photosensitizer employed. ALA-PDT can be improved with the use of ALA derivatives, reducing the amount of ALA necessary to induce efficient photosensitization.
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Affiliation(s)
- A Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP) FCEyN (University of Buenos Aires and CONICET), Argentina
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Casas A, Fukuda H, Di Venosa G, Batlle AM. The influence of the vehicle on the synthesis of porphyrins after topical application of 5-aminolaevulinic acid. Implications in cutaneous photodynamic sensitization. Br J Dermatol 2000; 143:564-72. [PMID: 10971330 DOI: 10.1111/j.1365-2133.2000.03711.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND The optimal vehicle to ensure adequate penetration of 5-aminolaevulinic acid (ALA) for its use in photodynamic therapy (PDT) of skin lesions has not been determined. OBJECTIVES We aimed to study the effects of ALA in various vehicle formulations [saline lotion with and without dimethylsulphoxide (DMSO), cream, liposomes and vaseline] after topical application in a murine subcutaneous adenocarcinoma model. METHODS The effect of DMSO on porphyrin synthesis and ALA penetration through the skin was studied by measuring the uptake of 14C label from ALA, ALA and porphobilinogen accumulation, and some haem enzyme activities. The tissue distribution and kinetics of porphyrin synthesis after topical application of ALA entrapped in large multilamellar liposomes was also determined. RESULTS ALA in saline lotion, alone or with 10% DMSO, proved to be the most efficient vehicle for tumour porphyrin accumulation (mean +/- SD 1.75 +/- 0.25 and 2.09 +/- 0.39 microg g-1, respectively), whereas cream and liposomes induced lower levels and identical porphyrin accumulation (0.60 microg g-1). Using ALA + DMSO saline lotion, a higher porphyrin accumulation was found in skin overlying the tumour tissue and in the first 2 mm of tumour, probably due to increased ALA penetration, or greater interconversion to porphyrins, or greater retention of ALA and/or porphyrins. CONCLUSIONS These findings reinforce the importance of the vehicle in topical ALA-based PDT, and explain the mechanism of action of DMSO in enhancing protoporphyrin IX biosynthesis in superficial lesions.
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Affiliation(s)
- A Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP) FCEyN (University of Buenos Aires and CONICET), Ciudad Universitaria, Pabellón II, 2do piso (1428) Capital Federal, Argentina
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Casas A, Fukuda H, Di Venosa G, Del C.batlle A. The influence of the vehicle on the synthesis of porphyrins after topical application of 5-aminolaevulinic acid. Implications in cutaneous photodynamic sensitization. Br J Dermatol 2000. [DOI: 10.1046/j.1365-2133.2000.03711.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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