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Brenes-Alvarado A, Farias-da-Silva FF, Soto-Montero JR, Benine-Warlet J, Groppo FC, Steiner-Oliveira C. Reduction of microorganisms in carious dentin by photodynamic therapy mediated by potassium iodide added to methylene blue and red laser. Arch Oral Biol 2024; 164:105978. [PMID: 38718465 DOI: 10.1016/j.archoralbio.2024.105978] [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: 10/10/2023] [Revised: 04/16/2024] [Accepted: 04/19/2024] [Indexed: 06/06/2024]
Abstract
OBJECTIVE To evaluate the effect of the association of potassium iodide to antimicrobial photodynamic therapy on human carious dentin produced with a microcosm biofilm model. METHODS A microcosm biofilm model was used to generate a caries lesion on human dentin. Pooled human saliva diluted with glycerol was used as an inoculum on specimens immersed on McBain artificial saliva enriched with 1 % sucrose (24 h at 37 °C in 5 % CO2). After refreshing culture media for 7 days, the dentin specimens were divided in 5 groups (3 specimens per group, in triplicate; n = 9): C (NaCl 0.9 %), CX (2 % chlorhexidine), PKI (0.01 % methylene blue photosensitizer+50 mM KI), L (laser at 15 J, 180 s, 22.7 J/cm2), and PKIL (methylene blue + KI + Laser). After the treatments, dentin was collected, and a 10-fold serial dilution was performed. The number of total microorganisms, total lactobacilli, total streptococci, and Streptococcus mutans was analyzed by microbial counts (CFU/mL). After normality and homoscedasticity analysis, the Welch's ANOVA and Dunnett's tests were used for CFU. All tests used a 5 % significance level. RESULTS CX and PKIL groups showed significant bacterial decontamination of dentin, compared to group C (p < 0.05) reaching reductions up to 3.8 log10 for CX for all microorganisms' groups and PKIL showed 0.93, 1.30, 1.45, and 1.22 log10 for total microorganisms, total lactobacilli, total streptococci, and S. mutans, respectively. CONCLUSION aPDT mediated by the association of KI and methylene blue with red laser reduced the viability of microorganisms from carious dentin and could be a promising option for cavity decontamination.
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Affiliation(s)
- Alejandra Brenes-Alvarado
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Universidad de Costa Rica, Montes de Oca, SJ, Costa Rica
| | - Felipe Fabrício Farias-da-Silva
- Department of Health Sciences and Pediatric Dentistry, Faculdade de Odontologia de Piracicaba (FOP), Universidade Estadual de Campinas (UNICAMP), Piracicaba, SP, Brazil
| | - Jorge Rodrigo Soto-Montero
- Department of Restorative Dentistry, School of Dentistry, Universidad de Costa Rica, Montes de Oca, SJ, Costa Rica
| | - Juliana Benine-Warlet
- Department of Health Sciences and Pediatric Dentistry, Faculdade de Odontologia de Piracicaba (FOP), Universidade Estadual de Campinas (UNICAMP), Piracicaba, SP, Brazil
| | - Francisco Carlos Groppo
- Department of Biosciences, Faculdade de Odontologia de Piracicaba (FOP), Universidade Estadual de Campinas (UNICAMP), Piracicaba, SP, Brazil
| | - Carolina Steiner-Oliveira
- Department of Health Sciences and Pediatric Dentistry, Faculdade de Odontologia de Piracicaba (FOP), Universidade Estadual de Campinas (UNICAMP), Piracicaba, SP, Brazil.
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Brenes-Alvarado A, Soto-Montero J, Farias-da-Silva FF, Benine-Warlet J, Ribeiro AF, Groppo FC, Steiner-Oliveira C. Does potassium iodide help in the microbial reduction of oral microcosm biofilms after photodynamic therapy with methylene blue and red laser? Photodiagnosis Photodyn Ther 2022; 40:103123. [PMID: 36115559 DOI: 10.1016/j.pdpdt.2022.103123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 08/13/2022] [Accepted: 09/13/2022] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To evaluate the efficacy of methylene blue (MB)-mediated antimicrobial photodynamic therapy (aPDT) doped with potassium iodide (KI) against oral microcosms biofilms cultured in dentin. METHODS A saliva-glycerol stock formed from pooled human saliva was diluted in McBain artificial saliva with 1% sucrose (1:1), inoculated on bovine dentin blocks, and refreshed daily for 5 days. The biofilms were divided (n = 9/group) and treated with 0.9% NaCl (C), 0.2% chlorhexidine (CX), 0.01% MB + low-power laser 15 J, 88 mW, 180 s (PL), and 0.01% MB + 50 mM KI + laser (PKIL). Serial dilution was performed, and cellular viability (CFU/mL) was evaluated for total microorganisms, total lactobacilli, total streptococci, and S. mutans. Additional biofilms were cultured and treated (n = 4) for biomass determination (%BMR). The microscopic structure of the biofilms was observed by SEM. One-way ANOVA and Tukey tests were conducted (α=5%). RESULTS Total microorganisms and total streptococci significantly reduced in biofilms treated with CX and PKIL when compared to C, but the CX, PKIL, and PL treatments did not differ from each other. Total lactobacilli and S. mutans showed a significant reduction in the CX, PL, and PKIL groups when compared to C, but with no difference between them. Biomass analysis showed a significantly reduction for CX and PKIL compared to C. SEM micrographs showed noticeable changes in bacterial membrane integrity for the PKIL and CX groups. CONCLUSION The addition of KI to methylene blue-mediated aPDT in microcosm biofilms was effective in reducing oral microorganisms, but the effect was group dependent.
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Affiliation(s)
- Alejandra Brenes-Alvarado
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, University of Campinas - UNICAMP, Av. Limeira, 901 - Areião, Piracicaba, SP 13414-903, Brazil; Department of Pediatric Dentistry and Orthodontics, School of Dentistry, University of Costa Rica, Instalaciones Deportivas, Montes de Oca, San José 11501-2060, Costa Rica
| | - Jorge Soto-Montero
- Department of Restorative Dentistry, School of Dentistry, University of Costa Rica, Instalaciones Deportivas, Montes de Oca, San José 11501-2060, Costa Rica
| | - Felipe Fabrício Farias-da-Silva
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, University of Campinas - UNICAMP, Av. Limeira, 901 - Areião, Piracicaba, SP 13414-903, Brazil
| | - Juliana Benine-Warlet
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, University of Campinas - UNICAMP, Av. Limeira, 901 - Areião, Piracicaba, SP 13414-903, Brazil
| | - Andreza Ferraz Ribeiro
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, University of Campinas - UNICAMP, Av. Limeira, 901 - Areião, Piracicaba, SP 13414-903, Brazil
| | - Francisco Carlos Groppo
- Department of Biosciences, Piracicaba Dental School, University of Campinas - UNICAMP, Av. Limeira, 901 - Areião, Piracicaba, SP 3414-903, Brazil
| | - Carolina Steiner-Oliveira
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, University of Campinas - UNICAMP, Av. Limeira, 901 - Areião, Piracicaba, SP 13414-903, Brazil.
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Bongaerts GPA, Williams RM, van der Wielen MWJ, Feiters MC. (Photo-)chemical roadmap to strategic antimicrobial photodynamic and photothermal therapies. J PORPHYR PHTHALOCYA 2022. [DOI: 10.1142/s1088424622500493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Cheng Z, Shi C, Gao X, Wang X, Kan G. Biochemical and Metabolomic Responses of Antarctic Bacterium Planococcus sp. O5 Induced by Copper Ion. TOXICS 2022; 10:toxics10060302. [PMID: 35736910 PMCID: PMC9230899 DOI: 10.3390/toxics10060302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 05/29/2022] [Accepted: 05/30/2022] [Indexed: 01/27/2023]
Abstract
Heavy metal pollution in the Antarctic has gone beyond our imagination. Copper toxicity is a selective pressure on Planococcus sp. O5. We observed relatively broad tolerance in the polar bacterium. The heavy metal resistance pattern is Pb2+ > Cu2+ > Cd2+ > Hg2+ > Zn2+. In the study, we combined biochemical and metabolomics approaches to investigate the Cu2+ adaptation mechanisms of the Antarctic bacterium. Biochemical analysis revealed that copper treatment elevated the activity of antioxidants and enzymes, maintaining the bacterial redox state balance and normal cell division and growth. Metabolomics analysis demonstrated that fatty acids, amino acids, and carbohydrates played dominant roles in copper stress adaptation. The findings suggested that the adaptive mechanisms of strain O5 to copper stress included protein synthesis and repair, accumulation of organic permeable substances, up-regulation of energy metabolism, and the formation of fatty acids.
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Baigorria E, Durantini JE, Martínez SR, Milanesio ME, Palacios YB, Durantini AM. Potentiation Effect of Iodine Species on the Antimicrobial Capability of Surfaces Coated with Electroactive Phthalocyanines. ACS APPLIED BIO MATERIALS 2021; 4:8559-8570. [PMID: 35005911 DOI: 10.1021/acsabm.1c01029] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The spreading of different infections can occur through direct contact with glass surfaces in commonly used areas. Incorporating the use of alternative therapies in these materials seems essential to reduce and also avoid bacterial resistance. In this work, the capability to kill microbes of glass surfaces coated with two electroactive metalated phthalocyanines (ZnPc-EDOT and CuPc-EDOT) is assessed. The results show that both of these materials are capable of producing reactive oxygen species; however, the polymer with Zn(II) (ZnPc-PEDOT) has a singlet oxygen quantum yield 8-fold higher than that of the Cu(II) containing analogue. This was reflected in the in vitro experiments where the effectiveness of the surfaces was tested in bacterial suspensions, monitoring single microbe inactivation upon attachment to the polymers, and eliminating mature biofilms. Furthermore, we evaluated the use of an inorganic salt (KI) to potentiate the photodynamic inactivation mediated by an electropolymerized surface. The addition of the salt improved the efficiency of phototherapy at least two times for both polymers; nevertheless, the material coated with ZnPc-PEDOT was the only one capable of eliminating >99.98% of the initial microbes loading under different circumstances.
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Affiliation(s)
- Estefanía Baigorria
- IDAS-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional 36 Km 601, X5804BYA Río Cuarto, Córdoba, Argentina
| | - Javier E Durantini
- IITEMA-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional 36 Km 601, X5804BYA Río Cuarto, Córdoba, Argentina
| | - Sol R Martínez
- IITEMA-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional 36 Km 601, X5804BYA Río Cuarto, Córdoba, Argentina
| | - María E Milanesio
- IDAS-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional 36 Km 601, X5804BYA Río Cuarto, Córdoba, Argentina
| | - Yohana B Palacios
- IDAS-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional 36 Km 601, X5804BYA Río Cuarto, Córdoba, Argentina
| | - Andrés M Durantini
- IDAS-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional 36 Km 601, X5804BYA Río Cuarto, Córdoba, Argentina
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Wang T, Wu L, Wang Y, Song J, Zhang F, Zhu X. Hexyl-aminolevulinate ethosome-mediated photodynamic therapy against acne: in vitro and in vivo analyses. Drug Deliv Transl Res 2021; 12:325-332. [PMID: 33730323 DOI: 10.1007/s13346-021-00942-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/08/2021] [Indexed: 12/20/2022]
Abstract
Biofilm formation by Propionibacterium acnes is known to cause failure of anti-acne treatment. Conventional therapies for acne are typically inadequate. Accordingly, in this study, we evaluated the therapeutic potential of photodynamic therapy (PDT) using hexyl-aminolevulinate (HAL)-loaded ethosomes (ESs) against the biofilms of P. acnes in vitro and P. acnes-induced inflammatory acne model in vivo. The antibacterial effects of HAL ESs were evaluated using XTT colorimetric assays and scanning electron microscopic observations of morphological changes. P. acnes was intradermally injected into the ears of Sprague-Dawley rats, and the anti-inflammatory effects of HAL ESs were measured by determining changes in appearance, histology, and the antibacterial effects by P. acnes abundance in ear tissues compared with blank control ESs, HAL alone, and 5-aminolevulinic acid (ALA) alone. The highest reduction in viability in P. acnes biofilms was observed after treatment with 5 mg/mL HAL ESs. Notably, blank control ESs also showed significant inhibitory effects. Furthermore, HAL ESs had superior therapeutic effects in the rat model compared with HAL or ALA solutions. The observed therapeutic effects of HAL ESs against P. acnes biofilms and P. acnes-induced inflammation suggest that PDT with HAL-loaded ESs may have potential applications in the treatment of acne.
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Affiliation(s)
- Tai Wang
- Department of Dermatology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou Guangdong, 510515, China
| | - Lifang Wu
- Department of Dermatology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou Guangdong, 510515, China
| | - Yingzhe Wang
- Department of Dermatology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou Guangdong, 510515, China
| | - Jinru Song
- Department of Dermatology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou Guangdong, 510515, China
| | - Feiyin Zhang
- Department of Dermatology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou Guangdong, 510515, China
| | - Xiaoliang Zhu
- Department of Dermatology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou Guangdong, 510515, China.
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Ndemueda A, Pereira I, Faustino MAF, Cunha Â. Photodynamic inactivation of the phytopathogenic bacterium Xanthomonas citri subsp. citri. Lett Appl Microbiol 2020; 71:420-427. [PMID: 32628776 DOI: 10.1111/lam.13350] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 06/13/2020] [Accepted: 06/29/2020] [Indexed: 12/12/2022]
Abstract
The present work intended to evaluate the applicability of photodynamic inactivation (PDI) of Xanthomonas citri subsp. citri with toluidine blue O (TBO), a commercial photosensitizer, as a strategy to control citrus canker. Assays were conducted with cell suspensions and biofilms, constructed either on polypropylene microtubes (in vitro assays) or on the surface of orange leaves (ex vivo assays), in the presence of TBO and under irradiation with artificial white light or natural sunlight. PDI assays using TBO alone caused a maximum 5·8 log10 reduction of X. citri viable cells in suspensions, and a much smaller inactivation (1·5 log10) in biofilms. However, concomitant use of KI potentiated the TBO photosensitization. Biofilms were inactivated down to the detection limit (>6 log10 reduction) with 5·0 µmol l-1 TBO + 10 mmol l-1 KI (in vitro) or 5·0 µmol l-1 TBO + 100 mmol l-1 KI (ex vivo) after artificial white light irradiation. Under natural sunlight, a reduction down to the detection limit of the Miles-Misra method was achieved with 50 µmol l-1 TBO and 100 mmol l-1 KI. PDI has potential to be applied in the control of citrus canker in field conditions although further studies are needed to show that there are no risks to plant physiology or fruit quality. SIGNIFICANCE AND IMPACT OF THE STUDY: Xanthomonas citri subsp. citri is a major cause of disease in citrus orchards. Because of the low efficacy and high environmental toxicity of copper-based treatments, there is growing interest on more sustainable phytosanitary approaches. Photodynamic inactivation (PDI) is being successfully used to control infectious agents and literature reports indicate that it is effective against some fungi and bacteria attacking fruit crops. The results of the present work open the perspective of using a low-cost photosensitizer and sunlight, as energy source, to control of the causative agent of citrus canker.
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Affiliation(s)
- A Ndemueda
- CESAM and Department of Biology, University of Aveiro, Aveiro, Portugal
| | - I Pereira
- CESAM and Department of Biology, University of Aveiro, Aveiro, Portugal
| | - M A F Faustino
- LAQV-REQUIMTE and Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Â Cunha
- CESAM and Department of Biology, University of Aveiro, Aveiro, Portugal
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Li R, Yuan L, Jia W, Qin M, Wang Y. Effects of Rose Bengal- and Methylene Blue-Mediated Potassium Iodide-Potentiated Photodynamic Therapy on Enterococcus faecalis: A Comparative Study. Lasers Surg Med 2020; 53:400-410. [PMID: 32662529 DOI: 10.1002/lsm.23299] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 06/25/2020] [Accepted: 06/26/2020] [Indexed: 11/08/2022]
Abstract
BACKGROUND AND OBJECTIVES This study was performed to compare the use of methylene blue (MB) and rose bengal (RB) in antimicrobial photodynamic therapy (PDT) targeting Enterococcus faecalis (E. faecalis) bacteria in planktonic and biofilm forms with potassium iodide (KI) potentiation. STUDY DESIGN/MATERIALS AND METHODS E. faecalis bacteria in planktonic form were exposed to antimicrobial PDT protocols activating MB and RB, with or without KI potentiation, following laser irradiation with different exposure times, 60 mW/cm2 laser power, and different photosensitizer agent (PS)/potentiator concentrations to observe relationships among the variables. Two continuous-wave diode lasers were used for irradiation (red light: λ = 660 nm and green light: λ = 565 nm). The pre-irradiation time was 10 minutes. The vitality of E. faecalis biofilm was assessed by confocal laser scanning microscopy, and the morphology was determined by scanning electron microscopy. The effects on the proliferation of stem cells from the apical papilla (SCAPs) were analyzed by cell counting kit-8 assay. The staining effect of antimicrobial PDT on dentin slices was investigated. Statistical analysis using a one-way analysis of variance was done. RESULTS KI-potentiated RB and MB antimicrobial PDT both effectively eradicated E. faecalis bacteria in planktonic and biofilm forms. The minimum bactericidal concentrations of PSs (±100 mM KI) were obtained through PDT on planktonic E. faecalis, and the optimal light parameters were 60 mW/cm2 , 6 J/cm2 for 100 seconds. KI-potentiated PDT effectively strengthened the ability to inhibit E. faecalis biofilm with 86.50 ± 5.78% for MB (P = 0.0015 < 0.01) and 91.50 ± 1.75% for RB (P = 0.0418 < 0.05) of bactericidal rate, with less toxicity for SCAPs (P < 0.001) and less staining. KI could reduce the staining induced by antimicrobial PDT on dentin slices. CONCLUSION A combination of KI and antimicrobial PDT may be a useful alternative to conventional disinfection methods in endodontic treatment. MB and RB antimicrobial PDT at much lower concentrations with KI could hopefully achieve disinfection effects comparable with those of 1.5% NaClO while causing few adverse effects on SCAPs. KI helps to avoid staining problems associated with high concentrations of photosensitizer agents. Lasers Surg. Med. © 2020 Wiley Periodicals, LLC.
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Affiliation(s)
- Ruijie Li
- Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
| | - Lintian Yuan
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University School and Hospital of Stomatology, Beijing, China.,Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
| | - Weiqian Jia
- Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
| | - Man Qin
- Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
| | - Yuguang Wang
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University School and Hospital of Stomatology, Beijing, China.,Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
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Castro KADF, Brancini GTP, Costa LD, Biazzotto JC, Faustino MAF, Tomé AC, Neves MGPMS, Almeida A, Hamblin MR, da Silva RS, Braga GÚL. Efficient photodynamic inactivation of Candida albicans by porphyrin and potassium iodide co-encapsulation in micelles. Photochem Photobiol Sci 2020; 19:1063-1071. [PMID: 32613213 DOI: 10.1039/d0pp00085j] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photodynamic inactivation of bacterial and fungal pathogens is a promising alternative to the extensive use of conventional single-target antibiotics and antifungal agents. The combination of photosensitizers and adjuvants can improve the photodynamic inactivation efficiency. In this regard, it has been shown that the use of potassium iodide (KI) as adjuvant increases pathogen killing. Following our interest in this topic, we performed the co-encapsulation of a neutral porphyrin photosensitizer (designated as P1) and KI into micelles and tested the obtained nanoformulations against the human pathogenic fungus Candida albicans. The results of this study showed that the micelles containing P1 and KI displayed a better photodynamic performance towards C. albicans than P1 and KI in solution. It is noteworthy that higher concentrations of KI within the micelles resulted in increased killing of C. albicans. Subcellular localization studies by confocal fluorescence microscopy revealed that P1 was localized in the cell cytoplasm, but not in the nuclei or mitochondria. Overall, our results show that a nanoformulation containing a photosensitizer plus an adjuvant is a promising approach for increasing the efficiency of photodynamic treatment. Actually, the use of this strategy allows a considerable decrease in the amount of both photosensitizer and adjuvant required to achieve pathogen killing.
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Affiliation(s)
- Kelly A D F Castro
- Departamento de Física e Química, Faculdade de Ciencias Farmacéuticas de Ribeirão Preto, Universidade de Sao Paulo, Ribeirao Preto, Brazil
| | - Guilherme T P Brancini
- Departamento Análises Clínicas, Toxicológicas e Bromatológicas, Facuidade de Ciencias Farmacêuticas de Ribeirao Preto, Universidade de Sao Paulo, Ribeirao Preto, Brazil
| | - Leticia D Costa
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Juliana C Biazzotto
- Departamento de Física e Química, Faculdade de Ciencias Farmacéuticas de Ribeirão Preto, Universidade de Sao Paulo, Ribeirao Preto, Brazil
| | - M Amparo F Faustino
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Augusto C Tomé
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal
| | - M Graca P M S Neves
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Adelaide Almeida
- CESAM, Department of Biology, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Michael R Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, 02114, Boston, MA, USA.,Laser Research Centre, Faculty of Health Science, University of Johannesburg, 2028, Doornfontein, South Africa
| | - Roberto S da Silva
- Departamento de Física e Química, Faculdade de Ciencias Farmacéuticas de Ribeirão Preto, Universidade de Sao Paulo, Ribeirao Preto, Brazil.
| | - Gilberto Ú L Braga
- Departamento Análises Clínicas, Toxicológicas e Bromatológicas, Facuidade de Ciencias Farmacêuticas de Ribeirao Preto, Universidade de Sao Paulo, Ribeirao Preto, Brazil
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Biofunctionalization of Textile Materials. 3. Fabrication of Poly(lactide)-Potassium Iodide Composites with Antifungal Properties. COATINGS 2020. [DOI: 10.3390/coatings10060593] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The paper presents a method of obtaining poly(lactide) (PLA) nonwoven fabrics with antifungal properties using potassium iodide as a nonwoven modifying agent. PLA nonwoven fabrics were obtained by the melt-blown technique and subsequently surface modified (PLA→PLA-SM-KI) by the dip-coating method. The analysis of these PLA-SM-KI (0.1%–2%) composites included Scanning Electron Microscopy (SEM), UV/VIS transmittance, FTIR spectrometry and air permeability. The nonwovens were subjected to microbial activity tests against Aspergillus niger fungal mold species, exhibiting substantial antifungal activity. The studies showed that PLA-KI hybrids containing 2% KI have appropriate mechanical properties, morphology and demanded antimicrobial properties to be further developed as a potential antimicrobial, biodegradable material.
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Vieira C, Gomes ATPC, Mesquita MQ, Moura NMM, Neves MGPMS, Faustino MAF, Almeida A. An Insight Into the Potentiation Effect of Potassium Iodide on aPDT Efficacy. Front Microbiol 2018; 9:2665. [PMID: 30510542 PMCID: PMC6252324 DOI: 10.3389/fmicb.2018.02665] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 10/18/2018] [Indexed: 12/15/2022] Open
Abstract
Antimicrobial photodynamic therapy (aPDT) is gaining a special importance as an effective approach against multidrug-resistant strains responsible of fatal infections. The addition of potassium iodide (KI), a non-toxic salt, is recognized to increase the aPDT efficiency of some photosensitizers (PSs) on a broad-spectrum of microorganisms. As the reported cases only refer positive aPDT potentiation results, in this work we selected a broad range of porphyrinic and non-porphyrinic PSs in order to gain a more comprehensive knowledge about this aPDT potentiation by KI. For this evaluation were selected a series of meso-tetraarylporphyrins positively charged at meso positions or at β-pyrrolic positions and the non-porphyrinic dyes Methylene blue, Rose Bengal, Toluidine Blue O, Malachite Green and Crystal Violet; the assays were performed using a bioluminescent E. coli strain as a model. The results indicate that KI has also the ability to potentiate the aPDT process mediated by some of the cationic PSs [Tri-Py(+)-Me, Tetra-Py(+)-Me, Form, RB, MB, Mono-Py(+)-Me, β-ImiPhTPP, β-ImiPyTPP, and β-BrImiPyTPP] allowing a drastic reduction of the treatment time as well as of the PS concentration. However, the efficacy of some porphyrinic and non-porphyrinic PSs [Di-Py(+)-Me opp , Di-Py(+)-Me adj , Tetra-Py, TBO, CV, and MG] was not improved by the presence of the coadjuvant. For the PSs tested in this study, the ones capable to decompose the peroxyiodide into iodine (easily detectable by spectroscopy or by the visual appearance of a blue color in the presence of amylose) were the most promising ones to be used in combination with KI. Although these studies confirmed that the generation of 1O2 is an important fact in this process, the PS structure (charge number and charge position), aggregation behavior and affinity for the cell membrane are also important features to be taken in account.
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Affiliation(s)
- Cátia Vieira
- Department of Biology and CESAM, University of Aveiro, Aveiro, Portugal
| | | | | | - Nuno M. M. Moura
- Department of Chemistry and QOPNA, University of Aveiro, Aveiro, Portugal
| | | | | | - Adelaide Almeida
- Department of Biology and CESAM, University of Aveiro, Aveiro, Portugal
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