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Zdubek A, Maliszewska I. On the Possibility of Using 5-Aminolevulinic Acid in the Light-Induced Destruction of Microorganisms. Int J Mol Sci 2024; 25:3590. [PMID: 38612403 PMCID: PMC11011456 DOI: 10.3390/ijms25073590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 03/15/2024] [Accepted: 03/19/2024] [Indexed: 04/14/2024] Open
Abstract
Antimicrobial photodynamic inactivation (aPDI) is a method that specifically kills target cells by combining a photosensitizer and irradiation with light at the appropriate wavelength. The natural amino acid, 5-aminolevulinic acid (5-ALA), is the precursor of endogenous porphyrins in the heme biosynthesis pathway. This review summarizes the recent progress in understanding the biosynthetic pathways and regulatory mechanisms of 5-ALA synthesis in biological hosts. The effectiveness of 5-ALA-aPDI in destroying various groups of pathogens (viruses, fungi, yeasts, parasites) was presented, but greater attention was focused on the antibacterial activity of this technique. Finally, the clinical applications of 5-ALA in therapies using 5-ALA and visible light (treatment of ulcers and disinfection of dental canals) were described.
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Affiliation(s)
| | - Irena Maliszewska
- Department of Organic and Medicinal Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, 50-370 Wrocław, Poland;
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2
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Ning S, Kang Q, Fan D, Liu J, Xue C, Zhang X, Ding C, Zhang J, Peng Q, Ji Z. Protein 4.1R is Involved in the Transport of 5-Aminolevulinic Acid by Interaction with GATs in MEF Cells. Photochem Photobiol 2017; 94:173-178. [DOI: 10.1111/php.12842] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Accepted: 08/30/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Shuwei Ning
- Institute of Medical and Pharmaceutical Sciences; Zhengzhou University; Zhengzhou China
- School of Life Sciences; Zhengzhou University; Zhengzhou China
| | - Qiaozhen Kang
- School of Life Sciences; Zhengzhou University; Zhengzhou China
| | - Dandan Fan
- Institute of Medical and Pharmaceutical Sciences; Zhengzhou University; Zhengzhou China
| | - Jingjing Liu
- Institute of Medical and Pharmaceutical Sciences; Zhengzhou University; Zhengzhou China
| | - Chaoyue Xue
- Institute of Medical and Pharmaceutical Sciences; Zhengzhou University; Zhengzhou China
- School of Life Sciences; Zhengzhou University; Zhengzhou China
| | - Xiaolin Zhang
- Institute of Medical and Pharmaceutical Sciences; Zhengzhou University; Zhengzhou China
- School of Life Sciences; Zhengzhou University; Zhengzhou China
| | - Cong Ding
- School of Life Sciences; Zhengzhou University; Zhengzhou China
| | - Jianying Zhang
- Institute of Medical and Pharmaceutical Sciences; Zhengzhou University; Zhengzhou China
| | - Qian Peng
- Department of Pathology; The Norwegian Radium Hospital; Oslo University Hospital; University of Oslo; Montebello Oslo Norway
| | - Zhenyu Ji
- Institute of Medical and Pharmaceutical Sciences; Zhengzhou University; Zhengzhou China
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Lee MJ, Hung SH, Huang MC, Tsai T, Chen CT. Doxycycline potentiates antitumor effect of 5-aminolevulinic acid-mediated photodynamic therapy in malignant peripheral nerve sheath tumor cells. PLoS One 2017; 12:e0178493. [PMID: 28558025 PMCID: PMC5448821 DOI: 10.1371/journal.pone.0178493] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 05/14/2017] [Indexed: 11/18/2022] Open
Abstract
Neurofibromatosis type 1 (NF1) is one of the most common neurocutaneous disorders. Some NF1 patients develop benign large plexiform neurofibroma(s) at birth, which can then transform into a malignant peripheral nerve sheath tumor (MPNST). There is no curative treatment for this rapidly progressive and easily metastatic neurofibrosarcoma. Photodynamic therapy (PDT) has been developed as an anti-cancer treatment, and 5-aminolevulinic (ALA) mediated PDT (ALA-PDT) has been used to treat cutaneous skin and oral neoplasms. Doxycycline, a tetracycline derivative, can substantially reduce the tumor burden in human and animal models, in addition to its antimicrobial effects. The purpose of this study was to evaluate the effect and to investigate the mechanism of action of combined doxycycline and ALA-PDT treatment of MPNST cells. An 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay showed that the combination of ALA-PDT and doxycycline significantly reduce MPNST survival rate, compared to cells treated with each therapy alone. Isobologram analysis showed that the combined treatment had a synergistic effect. The increased cytotoxic activity could be seen by an increase in cellular protoporphyrin IX (PpIX) accumulation. Furthermore, we found that the higher retention of PpIX was mainly due to increasing ALA uptake, rather than activity changes of the enzymes porphobilinogen deaminase and ferrochelatase. The combined treatment inhibited tumor growth in different tumor cell lines, but not in normal human Schwann cells or fibroblasts. Similarly, a synergistic interaction was also found in cells treated with ALA-PDT combined with minocycline, but not tetracycline. In summary, doxycycline can potentiate the effect of ALA-PDT to kill tumor cells. This increased potency allows for a dose reduction of doxycycline and photodynamic radiation, reducing the occurrence of toxic side effects in vivo.
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Affiliation(s)
- Ming-Jen Lee
- Department of Neurology, National Taiwan University Hospital, Taipei, Taiwan
- Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Shih-Hsuan Hung
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Mu-Ching Huang
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan
| | - Tsuimin Tsai
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chin-Tin Chen
- Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan
- * E-mail:
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4
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Casas A, Di Venosa G, Hasan T, Al Batlle. Mechanisms of resistance to photodynamic therapy. Curr Med Chem 2011; 18:2486-515. [PMID: 21568910 PMCID: PMC3780570 DOI: 10.2174/092986711795843272] [Citation(s) in RCA: 211] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Accepted: 05/11/2011] [Indexed: 01/25/2023]
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, Vanzulli S, Perotti C, Mamome L, Rodriguez L, Simian M, Juarranz A, Pontiggia O, Hasan T, Batlle A. Decreased metastatic phenotype in cells resistant to aminolevulinic acid-photodynamic therapy. Cancer Lett 2008; 271:342-51. [PMID: 18662847 DOI: 10.1016/j.canlet.2008.06.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Revised: 04/30/2008] [Accepted: 06/23/2008] [Indexed: 10/21/2022]
Abstract
Photodynamic therapy (PDT) is a novel cancer treatment utilising a photosensitiser, visible light and oxygen. PDT often leaves a significant number of surviving tumour cells. In a previous work, we isolated and studied two PDT resistant clones derived from the mammary adenocarcinoma LM3 line (Int. J. Oncol. 29 (2006) 397-405). The isolated Clon 4 and Clon 8 exhibited a more fibroblastic, dendritic pattern and were larger than the parentals. In the present work we studied the metastatic potential of the two clones in comparison with LM3. We found that 100% of LM3 invaded Matrigel, whereas only 19+/-6% and 24+/-7% of Clon 4 and Clon 8 cells invaded. In addition, 100% of LM3 cells migrated towards a chemotactic stimulus whereas 38+/-8% and 73+/-10% of Clones 4 and 8, respectively, were able to migrate. In vivo, 100% of the LM3 injected mice developed spontaneous lung metastasis, whereas none of the Clon 8 did, and only one of the mice injected with Clon 4 did. No differences were found in the proteolytic enzyme profiles among the cells. Anchorage-dependent adhesion was also impaired in vivo in the resistant clones, evidenced by the lower tumour take, latency time and growth rates, although both clones showed in vitro higher binding to collagen I without overexpression of beta1 integrin. This is the first work where the metastatic potential of cells surviving to PDT has been studied. PDT strongly affects the invasive phenotype of these cells, probably related to a higher binding to collagen. These findings may be crucial for the outcome of ALA-PDT of metastatic tumours, although further studies are needed to extrapolate the results to the clinic employing another photosensitisers and cell types.
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Affiliation(s)
- Adriana Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias, CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, 1056 Ciudad de Buenos Aires, Córdoba 2351 1er subsuelo, CP 1120AAF, Buenos Aires, Argentina.
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Rodriguez L, Divenosa G, Batlle A, Macrobert A, Casas A. Response to ALA-based PDT in an immortalised normal breast cell line and its counterpart transformed with the Ras oncogene. Photochem Photobiol Sci 2007; 6:1306-10. [PMID: 18046486 DOI: 10.1039/b704235c] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aminolevulinic acid (ALA)-based photodynamic therapy (PDT) has been successfully employed in the treatment of certain tumours. Porphyrins endogenously generated from ALA induce tumour regression after illumination with light of an appropriate wavelength. The aim of this work was to compare porphyrin production from ALA and sensitivity to photodynamic treatment in a tumour/normal cell line pair. We employed the HB4a cell line from normal mammary luminal epithelium and its counterpart transfected with the oncogen H-Ras (VAL/12 Ras). After 3 h of exposure to ALA, HB4a-Ras cells produce a maximum of 150 ng porphyrins per 10(5) cells whereas HB4a produce 95 ng porphyrins per 10(5) cells. In addition, HB4a-Ras cells show a plateau of porphyrin synthesis at 1 mM whereas HB4a porphyrins peak at the same concentration, and then decrease quickly. This higher porphyrin synthesis in the tumorigenic cell line does not lead to a higher response to the photodynamic treatment upon illumination. Lethal doses 50, LD(50), determined by MTT assay were 0.015 J cm(-2) and 0.039 J cm(-2) for HB4a and HB4a-Ras respectively after 3 h exposure to 1 mM ALA. The conclusion of this work is that a tumour cell line obtained by transfection of the Ras oncogene, although producing higher porphyrin synthesis from ALA, is more resistant to ALA-PDT than the parental non-tumour line, however the mechanism is not related to photosensitiser accumulation, but very likely to cell survival responses.
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Affiliation(s)
- Lorena Rodriguez
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET and Hospital de Clínicas José de San Martín, University of Buenos Aires, Viamonte 1881 10A, 1056 Buenos Aires, Argentina
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Casas A, Batlle A. Photodynamic therapy in Argentina. Photodiagnosis Photodyn Ther 2006; 3:205-13. [DOI: 10.1016/j.pdpdt.2006.06.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2006] [Accepted: 06/14/2006] [Indexed: 10/24/2022]
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Rodriguez L, Batlle A, Di Venosa G, Battah S, Dobbin P, MacRobert AJ, Casas A. Mechanisms of 5-aminolevulinic acid ester uptake in mammalian cells. Br J Pharmacol 2006; 147:825-33. [PMID: 16432502 PMCID: PMC1751507 DOI: 10.1038/sj.bjp.0706668] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The porphyrin precursor 5-aminolevulinic acid (ALA) is being widely used in photodynamic therapy of cancer. Improvement in ALA delivery has been sought through the use of ALA derivatives, in particular the esterification of ALA with aliphatic alcohols, which in certain cases can improve cellular penetration and selectivity. ALA uptake systems appear to be distinctive for each cell type. The LM3 mammary adenocarcinoma cell line takes ALA up by BETA transporters. In this work, we investigated ALA derivative transport systems through the inhibition of radiolabelled ALA uptake in the LM3 cells. We also performed inhibition studies of gamma-aminobutyric acid (GABA) uptake. The more lipohilic ALA derivatives hexyl-ALA and undecanoyl-ALA inhibit ALA uptake, whereas methyl-ALA, R, S-ALA-2-(hydroxymethyl)tetrahydropyranyl ester and the dendron aminomethane tris methyl 5-ALA does not inhibit ALA uptake. A similar pattern was found for GABA, except that the dendron inhibited GABA uptake. However, hexyl-ALA and undecanoyl-ALA are not taken up by BETA transporters, but by simple diffusion, although they still inhibit ALA uptake by binding to the cell membrane. These results show that different modifications to the ALA molecule lead to different uptake mechanisms. Whereas ALA is taken up by BETA transporters, none of the ALA derivatives shares the same mechanism. Knowledge of the mechanisms of ALA derivatives entry into the cells is essential to understand and improve ALA-mediated PDT and to the design of new ALA derivatives that may be taken up at a higher rate than ALA.
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Affiliation(s)
- Lorena 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, CP – 1120AAF, Argentina
| | - Alcira 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, CP – 1120AAF, Argentina
| | - Gabriela 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, CP – 1120AAF, Argentina
| | - Sinan Battah
- National Medical Laser Centre, Royal Free and University College Medical School, London
| | - Paul Dobbin
- School of Biological Sciences, University of Essex, Colchester
| | - Alexander J MacRobert
- National Medical Laser Centre, Royal Free and University College Medical School, London
| | - Adriana 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, CP – 1120AAF, Argentina
- Author for correspondence:
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Correa García S, Casas A, Perotti C, Batlle A, Bermúdez Moretti M. Mechanistic studies on delta-aminolevulinic acid uptake and efflux in a mammary adenocarcinoma cell line. Br J Cancer 2003; 89:173-7. [PMID: 12838320 PMCID: PMC2394206 DOI: 10.1038/sj.bjc.6601066] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Delta-aminolevulinic acid (ALA) is the precursor in the biosynthesis of porphyrins. The knowledge of both the regulation of ALA entrance and efflux from the cells and the control of porphyrin biosynthesis is essential to improve ALA-mediated photodynamic therapy. In this work, we studied the regulation of ALA uptake and efflux by endogenously accumulated ALA and/or porphyrins in murine mammary adenocarcinoma cells. Under our set of conditions, the haem synthesis inhibitor succinyl acetone completely prevented porphobilinogen and porphyrin synthesis from ALA, and led to an increase in the intracellular ALA pool. However, neither intracellular ALA nor porphyrin pools regulate ALA uptake or efflux during the first 15 min of the process. Based on temperature dependence data, ALA but not gamma-aminobutyric acid (GABA) efflux is mediated by a diffusion mechanism. Moreover, the addition of extracellular GABA not only did not influence the rate of ALA efflux but on the contrary it affected ALA uptake, showing the contribution of a saturable mechanism for the uptake, but not for the efflux of ALA from the cells.
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Affiliation(s)
- S Correa García
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), FCEN, University of Buenos Aires, Argentina; CONICET, Ciudad Universitaria, Pabellón II, 2° Piso, Buenos Aires, 1428 Argentina
| | - A Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), FCEN, University of Buenos Aires, Argentina; CONICET, Ciudad Universitaria, Pabellón II, 2° Piso, Buenos Aires, 1428 Argentina
| | - C Perotti
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), FCEN, University of Buenos Aires, Argentina; CONICET, Ciudad Universitaria, Pabellón II, 2° Piso, Buenos Aires, 1428 Argentina
| | - A Batlle
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), FCEN, University of Buenos Aires, Argentina; CONICET, Ciudad Universitaria, Pabellón II, 2° Piso, Buenos Aires, 1428 Argentina
- Viamonte 1881, 10A, C1056ABA, Buenos Aires, Argentina. E-mail:
| | - M Bermúdez Moretti
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), FCEN, University of Buenos Aires, Argentina; CONICET, Ciudad Universitaria, Pabellón II, 2° Piso, Buenos Aires, 1428 Argentina
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Bermúdez Moretti M, Correa García S, Perotti C, Batlle A, Casas A. Delta-Aminolevulinic acid transport in murine mammary adenocarcinoma cells is mediated by beta transporters. Br J Cancer 2002; 87:471-4. [PMID: 12177786 PMCID: PMC2376128 DOI: 10.1038/sj.bjc.6600481] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2002] [Revised: 05/09/2002] [Accepted: 05/10/2002] [Indexed: 11/09/2022] Open
Abstract
Delta-aminolevulinic acid, the precursor of porphyrin biosynthesis has been used to induce the endogenous synthesis of the photosensitiser protoporphyrin IX for photodynamic therapy in the treatment of various tumours. The aim of this work was to characterise the delta-aminolevulinic acid transport system in the murine mammary adenocarcinoma cell line LM3 using (14)C-delta-aminolevulinic acid, to finally improve delta-aminolevulinic acid incorporation in mammalian cells. Our results showed that delta-aminolevulinic acid is incorporated into these cells by two different mechanisms, passive diffusion which is important at the beginning of the incubation, and active transport. Specificity assays suggested that the transporter involved in delta-aminolevulinic acid incorporation is a BETA transporter, probably GAT-2.
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Affiliation(s)
- M Bermúdez Moretti
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), FCEN, University of Buenos Aires, CONICET. Ciudad Universitaria, Pabellón II, 2 degrees Piso, 1428, Buenos Aires, Argentina
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Casas A, Fukuda H, Batlle AM. Tissue distribution and kinetics of endogenous porphyrins synthesized after topical application of ALA in different vehicles. Br J Cancer 1999; 81:13-8. [PMID: 10487606 PMCID: PMC2374280 DOI: 10.1038/sj.bjc.6690644] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The use of 5-aminolaevulinic acid (ALA) is gaining increasing attention for photosensitization in photodynamic therapy of superficially localized tumours. The aim of this work was to determine the kinetics of porphyrin generation in tissues after topical application of ALA delivered in different vehicles on the skin overlying the tumour and normal skin of mice. Maximal accumulation was found in tumour 3 h after ALA application in both cream and lotion preparations. Normal and overlying tumour skin tissues showed different kinetic patterns, reflecting histological changes when the latter is invaded by tumour cells. Liver, kidney, spleen and blood porphyrins also raised from basal levels, showing that ALA and/or ALA-induced porphyrins reach all tissues after topical application. During the first 24 h of ALA topical application, precursors and porphyrins are excreted by both urine and faeces. ALA lotion applied on the skin overlying the tumour induced higher accumulation of tumoural porphyrins than cream, and lotion applied on normal skin appeared to be the most efficient upon inducing total body porphyrins. This work has demonstrated the great influence of the formulation of ALA vehicle on penetration through the skin. Knowledge of the kinetics of porphyrin generation after different conditions of ALA application is needed for the optimization of diagnosis and phototherapy in human tumours.
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Affiliation(s)
- A Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias, FCEyN (University of Buenos Aires) and CONICET; Ciudad Universitaria, Capital Federal, Argentina
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Batlle AM. Porphyrins, porphyrias, cancer and photodynamic therapy--a model for carcinogenesis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 1993; 20:5-22. [PMID: 8229469 DOI: 10.1016/1011-1344(93)80127-u] [Citation(s) in RCA: 142] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Porphyrins are the only and most powerful photosensitizers synthesized internally. To understand better the involvement of porphyrins in photosensitization reactions, the heme biosynthetic pathway is first described, as well as the main features of its regulation in both erythroid and hepatic cells. Most disorders of porphyrin metabolism, known as porphyrias, are characterized by porphyrin accumulation. A full discussion of these diseases, their classification and relevant biochemical and clinical signs are presented. Abnormalities in heme biosynthesis in disorders other than porphyrias, such as iron-deficient and sideroblastic anemias, lead poisoning, hereditary tyrosinemia, chronic renal disease and alcoholism, are briefly considered. A complete survey of the experimental research on the biosynthesis of porphyrins in tumors and of the important association between cancer and porphyrias is dealt with. The link to photodynamic therapy (PDT) emerges naturally and this is treated from the point of view of using porphyrins endogenously formed by the tumors for their localization and PDT. Finally, considering the nature of the alterations occurring in heme metabolism in tumors, and porphyrias and their ubiquity, a model is discussed where the abnormality of heme synthesis is involved in the initiating lesion of carcinogenesis. The model strongly predicts that the incidence of cancer will be high in cells with abnormal heme metabolism, suggesting that porphyric patients may be at greater risk of the development of cancer.
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Affiliation(s)
- A M Batlle
- Centro de Investigaciones sobre Porfirinas y Porfirias-CIPYP, CONICET-FCEN, UBA, Buenos Aires, Argentina
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