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Wang Y, Li C, Zhang H, Chi Y, Cai Y. The Potentiation Activity of Azithromycin in Combination with Colistin or Levofloxacin Against Pseudomonas aeruginosa Biofilm Infection. Infect Drug Resist 2024; 17:1259-1266. [PMID: 38562404 PMCID: PMC10984211 DOI: 10.2147/idr.s438576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 03/08/2024] [Indexed: 04/04/2024] Open
Abstract
Objective Pseudomonas aeruginosa (PA) often displays drug resistance and biofilm-mediated adaptability. Here, we aimed to evaluate the antibiofilm efficacy of azithromycin-based combination regimens. Methods Minimum inhibitory concentrations (MICs), minimal biofilm eradication concentrations (MBECs), and MBEC-combination of azithromycin, colistin, amikacin, and levofloxacin to bioluminescent strain PAO1 and carbapenem-resistant PAO1 (CRPAO1) were assessed. An animal biofilm infection model was established and detected using a live animal bio-photonic imaging system. Results In vitro, PAO1 and CRPAO1 were susceptible to colistin, amikacin, and levofloxacin, while they were unsusceptible to azithromycin. The combinations based on azithromycin have no synergistic effect on biofilm in vitro. In vivo, azithromycin plus colistin or levofloxacin could shorten the PAO1 biofilm eradication time, which totally eradicates the biofilm in all mice on the 8th or 6th day, while monotherapy only eradicate biofilm in 70% or 80% mice on the 8th day. For CRPAO1 biofilm, only azithromycin-colistin combination and colistin monotherapy eradicated the bacteria in 60% and 40% of mice at the 6th day. Conclusion Azithromycin-based combinations containing levofloxacin or colistin had no synergistic effect in vitro, and they are promising for clinical applications due to the good synergistic activity against PAO1 biofilms in vivo.
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Affiliation(s)
- Yuhang Wang
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center of PLA General Hospital, Beijing, People’s Republic of China
| | - Chunsun Li
- Laboratory of Department of Pulmonary and Critical Care Medicine, PLA General Hospital, Beijing, People’s Republic of China
| | - Huan Zhang
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center of PLA General Hospital, Beijing, People’s Republic of China
| | - Yulong Chi
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center of PLA General Hospital, Beijing, People’s Republic of China
| | - Yun Cai
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center of PLA General Hospital, Beijing, People’s Republic of China
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Rodrigues VS, Trevisan LAC, Cintra BS, Pires RH, Ribeiro AB, Tavares DC, Oberhaus E, Ferreira JC. Effectiveness of photo-ozone therapy against equine Pythium insidiosum. J Equine Vet Sci 2024; 134:105030. [PMID: 38342358 DOI: 10.1016/j.jevs.2024.105030] [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: 10/14/2023] [Revised: 01/18/2024] [Accepted: 02/06/2024] [Indexed: 02/13/2024]
Abstract
Cutaneous pythiosis is a life-threatening infectious disease. Low-level laser therapy (LLLT) and ozone (O3) have been used individually in the treatment of infected wounds. The goals of the study were a) to characterize the antimicrobial action of the photo-ozone therapy (LLLT-O3) against equine Pythium insidiosum, and b) to assess the cytotoxic potential of the LLLT-O3 in keratinocytes. Specimens of pathogen were isolated from 10 horses. After culturing, 120 hyphae plugs were distributed among four groups (n=30 hyphae plugs/group): LLLT (laser irradiation for 160 sec;), O3 (exposition to O3 for 15 min;), LLLT-O3 (LLLT and O3 treatments in sequence) and control (untreated plugs). The hyphae growth was measured during the first 14 days post-treatment. Where there was an absence of hyphae growth, the plug was recultured for an additional 7 days. The cytotoxic potential of the treatments against HaCaT keratinocytes was assessed by colorimetric assays. The LLLT-O3 and O3 treatments inactivated, respectively, 92.3% (28/30) and 30% (9/30) of the samples. No growth was detected after 7 days reculture of inactivated hyphae plugs on new media. Hyphae growth was visualized in 100% of the control and LLLT hyphae plugs. The viability of HaCaT cells was not affected by the isolated treatments (LLLT and O3), while the LLLT-O3 showed slight cytotoxic effect (20%) when compared to the control group (P<0.05). Photo-ozone therapy inactivated equine P. insidiosum hyphae with minimal cytotoxicity in skin cells in vitro.
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Affiliation(s)
- V S Rodrigues
- Post-graduation Program in Animal Sciences, University of Franca, 201 Dr. Armando de Sáles Oliveira, Franca, SP, Brazil, 14404-600
| | - L A C Trevisan
- Post-graduation Program in Animal Sciences, University of Franca, 201 Dr. Armando de Sáles Oliveira, Franca, SP, Brazil, 14404-600
| | - B S Cintra
- Post-graduation Program in Animal Sciences, University of Franca, 201 Dr. Armando de Sáles Oliveira, Franca, SP, Brazil, 14404-600
| | - R H Pires
- Post-graduation Program in Animal Sciences, University of Franca, 201 Dr. Armando de Sáles Oliveira, Franca, SP, Brazil, 14404-600
| | - A B Ribeiro
- Post-graduation Program in Animal Sciences, University of Franca, 201 Dr. Armando de Sáles Oliveira, Franca, SP, Brazil, 14404-600
| | - D C Tavares
- Post-graduation Program in Animal Sciences, University of Franca, 201 Dr. Armando de Sáles Oliveira, Franca, SP, Brazil, 14404-600
| | - E Oberhaus
- School of Animal Sciences, Louisiana State University, 201D Animal & Food Sciences Lab Bldg., Baton Rouge, LA, USA, 70803
| | - J C Ferreira
- Post-graduation Program in Animal Sciences, University of Franca, 201 Dr. Armando de Sáles Oliveira, Franca, SP, Brazil, 14404-600.
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Naghdi S, Ansari NN, Varedi M, Fathali M, Zarrin M, Kashi-Alashti M, HasanNia F. Use of low-level laser therapy for patients with chronic rhinosinusitis: a single-blind, sham-controlled clinical trial. Lasers Med Sci 2022; 38:5. [PMID: 36538169 DOI: 10.1007/s10103-022-03684-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 10/22/2022] [Indexed: 12/24/2022]
Abstract
Chronic rhinosinusitis (CRS) is one of the most common conditions all over the world. The purpose of this study was to investigate the effects of low-level laser therapy (LLLT) in patients with CRS. Fourteen adult patients with CRS participated in this single-blind, sham-controlled clinical trial (12 male, mean age 40 years). Patients received five successive sessions of sham laser followed by five successive sessions of real laser after 2 days. Ga-Al-As laser of 830 nm in a continuous mode at a power output of 30 mW and energy dose of 1 J was applied on the cheeks and the forehead for the maxillary and frontal sinuses, respectively. Laser was delivered on six points over each sinus, each point for 33 s. Four measurements were taken. The total symptom score (TSS) was calculated as the primary outcome measure. The effects of LLLT on TSS were evaluated by using repeated measure ANOVA. The percentage improvement of real laser and sham laser was compared by Wilcoxon signed ranked test. Cohen's d was used to calculate the effect size. Total symptom score significantly improved after real laser (p = 0.015, Cohen's d = 0.69). The percentage improvement for real laser (34.12 ± 46.43) was significantly better than the sham laser (5.02 ± 37.34, Z = - 2.23, p = 0.026). No significant improvements were observed after sham laser. This study indicates that five-session active LLLT when compared with sham is effective in the treatment of CRS symptoms.
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Affiliation(s)
- Soofia Naghdi
- Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Enghelab Ave, Pich-E-Shemiran, Zip: 11489, Tehran, Iran.
- Research Center for War-Affected People, Tehran University of Medical Sciences, Tehran, Iran.
| | - Noureddin Nakhostin Ansari
- Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Enghelab Ave, Pich-E-Shemiran, Zip: 11489, Tehran, Iran
- Research Center for War-Affected People, Tehran University of Medical Sciences, Tehran, Iran
| | - Mitra Varedi
- Epidemiology and Cancer Control Department, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Mojtaba Fathali
- Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Enghelab Ave, Pich-E-Shemiran, Zip: 11489, Tehran, Iran
| | - Milad Zarrin
- Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Enghelab Ave, Pich-E-Shemiran, Zip: 11489, Tehran, Iran
| | - Mina Kashi-Alashti
- Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Enghelab Ave, Pich-E-Shemiran, Zip: 11489, Tehran, Iran
| | - Fatemeh HasanNia
- Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Enghelab Ave, Pich-E-Shemiran, Zip: 11489, Tehran, Iran
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Wang Y, Li C, Wang J, Bai N, Zhang H, Chi Y, Cai Y. The Efficacy of Colistin Combined with Amikacin or Levofloxacin against Pseudomonas aeruginosa Biofilm Infection. Microbiol Spectr 2022; 10:e0146822. [PMID: 36102678 PMCID: PMC9603716 DOI: 10.1128/spectrum.01468-22] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 08/18/2022] [Indexed: 12/31/2022] Open
Abstract
Pseudomonas aeruginosa (PA) biofilm infection is clinically prevalent and difficult to eradicate. In the present work, we aimed to evaluate the in vitro and in vivo efficacy of colistin (COL)-based combinations against PA biofilm. MICs and fractional inhibitory concentration indexes (FICIs) of four antibiotics (COL, amikacin, levofloxacin, and meropenem) to bioluminescent strain PAO1, carbapenem-resistant PAO1 (CRPAO1), and clinically isolated strains were assessed. Minimal biofilm eradication concentrations (MBECs) of monotherapy and combinations were examined by counting the live bacteria in biofilm, accompanied by visual confirmation using confocal laser-scanning microscopy. An animal biofilm infection model was established by implanting biofilm subcutaneously, and the therapeutic effect was evaluated according to the change in luminescence through a live animal bio-photonic imaging system. In vitro, even combined with 4 or 8 mg/L COL, meropenem needed to reach 128 or 256 mg/L to eradicate the biofilm. Moreover, 2 mg/L COL combined with 32 mg/L amikacin or 4-8 mg/L levofloxacin could kill the PAO1 and CRPAO1 in biofilm within 24 h. In vivo, COL combined with amikacin or levofloxacin could shorten the eradication time of biofilm than monotherapy. For PAO1 biofilm, combination therapy could eradicate the biofilm in all mice on the 5th day, whereas monotherapy only eradicated biofilms in almost half of the mice. For CRPAO1 biofilm, the biofilm eradication rate on the 6th day in the COL+ amikacin, amikacin, or COL alone regimen was 90%, 10%, or 40%, respectively. COL combined with levofloxacin did not show a better effect than each individual antibiotic. COL-based combinations containing levofloxacin or amikacin were promising choices for treating PA biofilm infection. IMPORTANCE Infections associated with PA biofilm formation are extremely challenging. When monotherapy fails to achieve optimal efficacy, combination therapy becomes the last option. After evaluating multiple drug combinations through a series of experiments in vitro and in vivo, we confirmed that colistin-based combinations containing levofloxacin or amikacin were promising choices for treating PA biofilm infection. The efficacy of these combinations derives from the different bactericidal mechanisms and the bacterial susceptibility to each antibiotic. This study provided a new regimen to solve the incurable problem of biofilm by using COL combined with other antibiotics.
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Affiliation(s)
- Yuhang Wang
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center, PLA General Hospital, Beijing, People’s Republic of China
| | - Chunsun Li
- Laboratory of Department of Pulmonary and Critical Care Medicine, PLA General Hospital, Beijing, People’s Republic of China
| | - Jin Wang
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center, PLA General Hospital, Beijing, People’s Republic of China
| | - Nan Bai
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center, PLA General Hospital, Beijing, People’s Republic of China
| | - Huan Zhang
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center, PLA General Hospital, Beijing, People’s Republic of China
| | - Yulong Chi
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center, PLA General Hospital, Beijing, People’s Republic of China
| | - Yun Cai
- Center of Medicine Clinical Research, Department of Pharmacy, Medical Supplies Center, PLA General Hospital, Beijing, People’s Republic of China
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Besser M, Schaeler L, Plattfaut I, Brill FHH, Kampe A, Geffken M, Smeets R, Debus ES, Stuermer EK. Pulsed low-intensity laser treatment stimulates wound healing without enhancing biofilm development in vitro. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2022; 233:112504. [PMID: 35777177 DOI: 10.1016/j.jphotobiol.2022.112504] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 03/14/2022] [Accepted: 06/20/2022] [Indexed: 06/15/2023]
Abstract
OBJECTIVES Treating infected or chronic wounds burdened with biofilms still is a major challenge in medical care. Healing-stimulating factors lose their efficacy due to bacterial degradation, and antimicrobial substances negatively affect dermal cells. Therefore, alternative treatment approaches like the pulsed low intensity laser therapy (LILT) require consideration. METHODS The effect of pulsed LILT (904 nm, in three frequencies) on relevant human cells of the wound healing process (fibroblasts (BJ), keratinocytes (HaCaT), endothelial cells (HMEC), monocytes (THP-1)) were investigated in in-vitro and ex-vivo wound models with respect to viability, proliferation and migration. Antimicrobial efficacy of the most efficient frequency in cell biological analyses of LILT (3200 Hz) was determined in a human biofilm model (lhBIOM). Quantification of bacterial load was evaluated by suspension method and qualitative visualization was performed by scanning electron microscopy (SEM). RESULTS Pulsed LILT at 904 nm at 3200 Hz ± 50% showed the most positive effects on metabolic activity and proliferation of human wound cells in vitro (after 72 h - BJ: BPT 0.97 ± 0.05 vs. 0.75 ± 0.04 (p = 0.0283); HaCaT: BPT 0.79 ± 0.04 vs. 0.59 ± 0.02 (p = 0.0106); HMEC: 0.74 ± 0.02 vs. 0.52 ± 0.04 (p = 0.009); THP-1: 0.58 ± 0.01 vs. 0.64 ± 0.01 (p > 0.05) and ex vivo. Interestingly, re-epithelialization was stimulated in a frequency-independent manner. The inhibition of metabolic activity after TNF-α application was abolished after laser treatment. No impact of LILT on monocytes was detected. Likewise, the tested LILT regimens showed no growth rate reducing effects on three bacterial strains (after 72 h - PA: -1.03%; SA: -0.02%; EF: -1,89%) and one fungal (-2.06%) biofilm producing species compared to the respective untreated control. Accordingly, no significant morphological changes of the biofilms were observed after LILT treatment in the SEM. CONCLUSIONS Frequent application of LILT (904 nm, 3200 Hz) seems to be beneficial for the metabolism of human dermal cells during wound healing. Considering this, the lack of disturbance of the behavior of the immune cells and no growth-inducing effect on bacteria and fungi in the biofilm can be assigned as rather positive. Based on this combined mode of action, LILT may be an option for hard to heal wounds infected with persistent biofilms.
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Affiliation(s)
- Manuela Besser
- Clinic for General, Visceral and Transplant Surgery, University Hospital Muenster, Germany
| | - Lukas Schaeler
- Institute of Virology and Microbiology, Faculty of Health, Centre for Biomedical Education and Research (ZBAF), Witten/Herdecke University, Germany
| | - Isabell Plattfaut
- Institute of Virology and Microbiology, Faculty of Health, Centre for Biomedical Education and Research (ZBAF), Witten/Herdecke University, Germany
| | - Florian H H Brill
- Dr. Brill + Partner GmbH, Institute for Hygiene and Microbiology, Hamburg, Germany
| | - Andreas Kampe
- Dr. Brill + Partner GmbH, Institute for Hygiene and Microbiology, Hamburg, Germany
| | - Maria Geffken
- Institute for Transfusion Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ralf Smeets
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Germany
| | - E Sebastian Debus
- Dpt. of Vascular Medicine, University Heart Center, University Medical Center Hamburg-Eppendorf (UKE), Germany
| | - Ewa K Stuermer
- Dpt. of Vascular Medicine, University Heart Center, University Medical Center Hamburg-Eppendorf (UKE), Germany.
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Rodriguez-Alvarez JS, Kratky L, Yates-Alston S, Sarkar S, Vogel K, Gutierrez-Aceves J, Levi N. A PEDOT nano-composite for hyperthermia and elimination of urological bacteria. BIOMATERIALS ADVANCES 2022; 139:212994. [PMID: 35882143 DOI: 10.1016/j.bioadv.2022.212994] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 05/22/2022] [Accepted: 06/16/2022] [Indexed: 06/15/2023]
Abstract
Novel modalities for overcoming recurrent urinary tract infections associated with indwelling urinary catheters are needed, and rapidly induced hyperthermia is one potential solution. PEDOT nanotubes are a class of photothermal particles that can easily be incorporated into silicone to produce thin, uniform coating on medical grade silicone catheters; subsequent laser stimulation therein imparts temperature elevations that can eliminate bacteria and biofilms. PEDOT silicone coatings are stable following thermal sterilization and repeated heating and cooling cycles. Laser stimulation can induce temperature increases of up to 55 °C in 300 s, but only 45 s was needed for ablation of UTI inducing E. coli biofilms in vitro. This work also demonstrates that mild hyperthermia of 50 °C, applied for only 31 s in the presence of antibiotics could eliminate E. coli biofilm as effectively as high temperatures. This work culminates in the evaluation of the PEDOT NTs for photothermal elimination of E. coli in an in vivo model to demonstrate the safety and effectiveness of a photothermal nanocomposite (16 s treatment time) for rapid clearance of E. coli.
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Affiliation(s)
- Juan Sebastian Rodriguez-Alvarez
- Department of Plastic and Reconstructive Surgery, Wake Forest University School of Medicine, Winston-Salem, NC 27157, United States of America; Department of Urology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, United States of America
| | - Lauren Kratky
- Department of Plastic and Reconstructive Surgery, Wake Forest University School of Medicine, Winston-Salem, NC 27157, United States of America
| | - Shaina Yates-Alston
- Department of Plastic and Reconstructive Surgery, Wake Forest University School of Medicine, Winston-Salem, NC 27157, United States of America
| | - Santu Sarkar
- Department of Plastic and Reconstructive Surgery, Wake Forest University School of Medicine, Winston-Salem, NC 27157, United States of America
| | - Kenneth Vogel
- Department of Plastic and Reconstructive Surgery, Wake Forest University School of Medicine, Winston-Salem, NC 27157, United States of America
| | - Jorge Gutierrez-Aceves
- Department of Urology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, United States of America
| | - Nicole Levi
- Department of Plastic and Reconstructive Surgery, Wake Forest University School of Medicine, Winston-Salem, NC 27157, United States of America.
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Robati M, Yousefimanesh H, Shokuhi far MR, Bagheri S. Effect of low-level diode laser on streptococcus mutans and lactobacillus acidophilus growth: An invitro study. J Oral Biol Craniofac Res 2022; 12:396-400. [DOI: 10.1016/j.jobcr.2022.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 11/27/2021] [Accepted: 05/01/2022] [Indexed: 11/16/2022] Open
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Tran VN, Park S, Khan F, Truong VG, Jeong S, Lee DH, Kim YM, Kang HW. Collective bacterial disinfection by opto-chemical treatment on mature biofilm in clinical endoscope. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2022; 226:112367. [PMID: 34847498 DOI: 10.1016/j.jphotobiol.2021.112367] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/12/2021] [Accepted: 11/17/2021] [Indexed: 02/07/2023]
Abstract
The present study proposes an innovative opto-chemical treatment using a basket-integrated optical device (BIOD) to disinfect mature bacterial biofilm on endoscope channels. A BIOD was designed to position an optical diffuser on the central axis of an endoscope channel and to distribute laser light concentrically to the bacterial biofilm on the channel surface. To apply thermal damage and oxidative stress to the bacterial biofilm, a low concentration of a crosslinking agent (glutaraldehyde ~0.5%) was combined with 808 nm infrared (IR) and 405 nm blue (BL) laser lights. The applied irradiances of IR and BL were 10 W/cm2 and 1.6 W/cm2 for Teflon channel model and 20 W/cm2 and 3.2 W/cm2 for a clinical model, respectively. Individual irradiation of either IR or BL for 180 s induced the maximum temperatures of 62 ± 2 °C and 53 ± 3 °C on the biofilm, respectively. The simultaneous opto-chemical treatment reduced a significant population of the bacterial biofilms (7.5-log10 for Staphylococcus aureus and 7.1-log10 for Pseudomonas aeruginosa), which were 2.9-fold and 3.9-fold higher than that of the standard treatment with 2% glutaraldehyde (GA) solution, respectively. The proposed opto-chemical disinfection method can help reduce multi-drug resistant bacteria and prevent cross-infection during the clinical usage of a flexible endoscope.
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Affiliation(s)
- Van Nam Tran
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan 48513, South Korea
| | - Suhyun Park
- Department of Electronic and Electrical Engineering, Ewha Womans University, Seoul 03760, South Korea
| | - Fazlurrahman Khan
- Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan 48513, South Korea
| | - Van Gia Truong
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan 48513, South Korea
| | - Seok Jeong
- Division of Gastroenterology, Department of Internal Medicine, Inha University College of Medicine, Incheon 22212, South Korea
| | - Don Haeng Lee
- Division of Gastroenterology, Department of Internal Medicine, Inha University College of Medicine, Incheon 22212, South Korea
| | - Young-Mog Kim
- Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan 48513, South Korea; Department of Food Science and Technology, Pukyong National University, Busan 48513, South Korea
| | - Hyun Wook Kang
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan 48513, South Korea; Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan 48513, South Korea; Department of Biomedical Engineering, Pukyong National University, Busan 48513, South Korea.
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9
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Feng Y, Coradi Tonon C, Ashraf S, Hasan T. Photodynamic and antibiotic therapy in combination against bacterial infections: efficacy, determinants, mechanisms, and future perspectives. Adv Drug Deliv Rev 2021; 177:113941. [PMID: 34419503 DOI: 10.1016/j.addr.2021.113941] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 07/23/2021] [Accepted: 08/17/2021] [Indexed: 12/12/2022]
Abstract
Antibiotic treatment, the mainstay for the control of bacterial infections, is greatly hampered by the global prevalence of multidrug-resistant (MDR) bacteria. Photodynamic therapy (PDT) is effective against MDR infections, but PDT-induced bacterial inactivation is often incomplete, causing the relapse of infections. Combination of PDT and antibiotics is a promising strategy to overcome the limitation of both antibiotic treatment and PDT, exerting increased disinfection efficacy on MDR bacterial pathogens versus either of the monotherapies alone. In this review, we present an overview of the therapeutic effects of PDT/antibiotic combinations that have been developed. We further summarize the influencing factors and the governing molecular mechanisms of the therapeutic outcomes of PDT/antibiotic combinations. In the end, we provide concluding remarks on the strengths, limitations, and future research directions of PDT/antibiotic combination therapy to guide its appropriate usage and further development.
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Affiliation(s)
- Yanfang Feng
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
| | - Caroline Coradi Tonon
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
| | - Shoaib Ashraf
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
| | - Tayyaba Hasan
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Health Sciences and Technology (Harvard-MIT), Cambridge, MA, USA.
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Haswani N, Suri H, Somayaji G. Role of biofilms in otorhinolaryngological Diseases. ARCHIVES OF MEDICINE AND HEALTH SCIENCES 2021. [DOI: 10.4103/amhs.amhs_291_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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11
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Wille J, Coenye T. Biofilm dispersion: The key to biofilm eradication or opening Pandora's box? Biofilm 2020; 2:100027. [PMID: 33447812 PMCID: PMC7798462 DOI: 10.1016/j.bioflm.2020.100027] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 05/28/2020] [Accepted: 05/28/2020] [Indexed: 12/16/2022] Open
Abstract
Biofilms are extremely difficult to eradicate due to their decreased antibiotic susceptibility. Inducing biofilm dispersion could be a potential strategy to help combat biofilm-related infections. Mechanisms of biofilm dispersion can basically be divided into two groups, i.e. active and passive dispersion. Active dispersion depends on a decrease in the intracellular c-di-GMP levels, leading to the production of enzymes that degrade the biofilm matrix and promote dispersion. In contrast, passive dispersion relies on triggers that directly release cells from the biofilm. In the present review, several active and passive dispersion strategies are discussed. In addition, the disadvantages and possible consequences of using dispersion as a treatment approach for biofilm-related infections are also reviewed.
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Affiliation(s)
- Jasper Wille
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
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12
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Griffin AS, Cabot P, Wallwork B, Panizza B. Alternative therapies for chronic rhinosinusitis: A review. EAR, NOSE & THROAT JOURNAL 2020:145561320939415. [PMID: 33023328 DOI: 10.1177/0145561320939415] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The use of alternative medicine in chronic rhinosinus-itis (CRS) continues to increase in popularity, for the most part without meeting the burden of being based on sound clinical evidence. New and emerging treat-ments, both natural and developed, are numerous, and it remains a challenge for otolaryngologists as well as general practitioners to keep up to date with these therapies and their efficacy. In this systematic review, we discuss a number of alternative therapies for CRS, their proposed physiologic mechanisms, and evidence supporting their use. This analysis is based on our re-view of the English-language literature on alternative therapies for CRS (we did not include any therapies that are already recommended by accepted profession-al bodies). Data collection was performed using the PubMed database (not restricted to MEDLINE due to the nature of the subject matter), the Cochrane data-bases, and bibliography searches. We found that while many of the alternative therapies we reviewed might have a firm basis in science, they lack any clinical ev-idence to support their use specifically for CRS. Some emerging therapies, such as therapeutic ultrasonog-raphy and phonophoresis, show some promise, based on a growing body of positive evidence. In addition, the use of baby shampoo, thyme honey, and bromelain additives to saline lavage in CRS are all supported by clinical evidence, as is Sinupret, an oral preparation that contains echinacea. However, higher levels of ev-idence gleaned from large, well-designed, prospective, randomized, controlled trials are needed before any of these therapies can be recommended.
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Affiliation(s)
- Aaron S Griffin
- From the Pharmacy Australia Centre of Excellence, School of Pharmacy, University of Queensland, Woolloongabba, Queensland, Australia
- Department of Otolaryngology-Head and Neck Surgery, Princess Alexandra Hospital, Woolloongabba
| | - Peter Cabot
- From the Pharmacy Australia Centre of Excellence, School of Pharmacy, University of Queensland, Woolloongabba, Queensland, Australia
| | - Ben Wallwork
- From the Pharmacy Australia Centre of Excellence, School of Pharmacy, University of Queensland, Woolloongabba, Queensland, Australia
- Department of Otolaryngology-Head and Neck Surgery, Princess Alexandra Hospital, Woolloongabba
| | - Ben Panizza
- From the Pharmacy Australia Centre of Excellence, School of Pharmacy, University of Queensland, Woolloongabba, Queensland, Australia
- Department of Otolaryngology-Head and Neck Surgery, Princess Alexandra Hospital, Woolloongabba
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Tran VN, Dasagrandhi C, Truong VG, Kim YM, Kang HW. Antibacterial activity of Staphylococcus aureus biofilm under combined exposure of glutaraldehyde, near-infrared light, and 405-nm laser. PLoS One 2018; 13:e0202821. [PMID: 30148865 PMCID: PMC6110465 DOI: 10.1371/journal.pone.0202821] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Accepted: 08/09/2018] [Indexed: 01/31/2023] Open
Abstract
Healthcare-associated infections have increasingly become problematic in the endoscopic procedures resulting in several severe diseases such as carbapenem-resistant Enterobacteriaceae (CRE)-related infections, pneumonia, and bacteremia. Especially, some bacterial strains are resistant to traditional antimicrobials. Therefore, the necessity of developing new antibiotics or management to deal with bacterial infections has been increasing. The current study combined a low concentration of glutaraldehyde (GTA) with near-infrared (NIR) light and 405-nm laser to entail antibacterial activity on Staphylococcus aureus biofilm. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay and colony forming unit (CFU) counting were used to quantify the viable cells while fluorescent and scanning electron microscopic images were used to qualitatively evaluate the cell membrane integrity and structural deformation, respectively. Practically, S. aureus biofilm was highly susceptible (7% cell viability and 6.8-log CFU/cm2 bacterial reduction for MTT assay and CFU analysis, respectively) to the combination of GTA (0.1%), NIR light (270 J/cm2), and 405-nm laser (288 J/cm2) exposure. GTA could form either DNA-protein or protein-protein crosslinks to inhibit DNA and protein synthesis. The NIR light induced the thermal damage on protein/enzymes while 405-nm laser could induce reactive oxygen species (ROS) to damage the bacterial membrane. Thus, the proposed technique may be a feasible modality for endoscope cleaning to prevent any secondary infection in the healthcare industry.
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Affiliation(s)
- Van Nam Tran
- Department of Biomedical Engineering, Pukyong National University, Busan, Korea
| | | | - Van Gia Truong
- Department of Biomedical Engineering, Pukyong National University, Busan, Korea
| | - Young-Mog Kim
- Department of Food Science and Technology, Pukyong National University, Busan, Korea
| | - Hyun Wook Kang
- Department of Biomedical Engineering, Pukyong National University, Busan, Korea
- Center for Marine-Integrated Biomedical Technology, Pukyong National University, Busan, Korea
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14
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Wozniak A, Grinholc M. Combined Antimicrobial Activity of Photodynamic Inactivation and Antimicrobials-State of the Art. Front Microbiol 2018; 9:930. [PMID: 29867839 PMCID: PMC5952179 DOI: 10.3389/fmicb.2018.00930] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 04/20/2018] [Indexed: 11/13/2022] Open
Abstract
Antimicrobial photodynamic inactivation (aPDI) is a promising tool for the eradication of life-threatening pathogens with different profiles of resistance. This study presents the state-of-the-art published studies that have been dedicated to analyzing the bactericidal effects of combining aPDI and routinely applied antibiotics in in vitro (using biofilm and planktonic cultures) and in vivo experiments. Furthermore, the current paper reviews the methodology used to obtain the published data that describes the synergy between these antimicrobial approaches. The authors are convinced that even though the combined efficacy of aPDI and antimicrobials could be investigated with the wide range of methods, the use of a unified experimental methodology that is in agreement with antimicrobial susceptibility testing (AST) is required to investigate possible synergistic cooperation between aPDI and antimicrobials. Conclusions concerning the possible synergistic activity between the two treatments can be drawn only when appropriate assays are employed. It must be noticed that some of the described papers were just aimed at determination if combined treatments exert enhanced antibacterial outcome, without following the standard methodology to evaluate the synergistic effect, but in most of them (18 out of 27) authors indicated the existence of synergy between described antibacterial approaches. In general, the increase in bacterial inactivation was observed when both therapies were used in combination.
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Affiliation(s)
- Agata Wozniak
- Laboratory of Molecular Diagnostics, Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland
| | - Mariusz Grinholc
- Laboratory of Molecular Diagnostics, Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland
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15
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Enhancement of photodynamic inactivation of Staphylococcus aureus biofilms by disruptive strategies. Lasers Med Sci 2017; 32:1757-1767. [PMID: 28612299 DOI: 10.1007/s10103-017-2253-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 06/05/2017] [Indexed: 01/10/2023]
Abstract
Photodynamic inactivation (PDI) has been used to inactivate microorganisms through the use of photosensitizers and visible light. On the one hand, near-infrared treatment (NIRT) has also bactericidal and dispersal effects on biofilms. In addition, dispersal biological tools such as enzymes have also been employed in antibiotic combination treatments. The aim of this work was to use alternative approaches to increase the PDI efficacy, employing combination therapies aimed at the partial disruption of the biofilms, thus potentially increasing photosensitizer or oxygen penetration and interaction with bacteria. To that end, we applied toluidine blue (TB)-PDI treatment to Staphylococcus aureus biofilms previously treated with NIRT or enzymes and investigated the outcome of the combined therapies. TB employed at 0.5 mM induced per se 2-log drop in S. aureus RN6390 biofilm viability. Each NIRT (980-nm laser) and PDI (635-nm laser) treatment induced a further reduction of 1-log of viable counts. The combination of successive 980- and 635-nm laser treatments on TB-treated biofilms induced additive effects, leading to a 4.5-log viable count decrease. Proteinase K treatment applied to S. aureus of the Newman strain induced an additive effect on PDI mortality, leading to an overall 4-log decrease in S. aureus viability. Confocal scanning laser microscopy after biofilm staining with a fluorescent viability test and scanning electron microscopy observations were correlated with colony counts. The NIRT dose employed (227 J/cm2) led to an increase from 21 to 47 °C in the buffer temperature of the biofilm system, and this NIRT dose also induced 100% keratinocyte death. Further work is needed to establish conditions under which biofilm dispersal occurs at lower NIRT doses.
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16
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Yao W, Kuan EC, Francis NC, St John MA, Grundfest WS, Taylor ZD. Laser-generated shockwaves enhance antibacterial activity against biofilms in vitro. Lasers Surg Med 2017; 49:539-547. [PMID: 28333393 DOI: 10.1002/lsm.22627] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/16/2016] [Indexed: 01/23/2023]
Abstract
BACKGROUND AND OBJECTIVES Bacterial biofilm formation within chronic wound beds, which provides an effective barrier against antibiotics, is a known cause of recalcitrant infections and a significant healthcare burden, often requiring repeated surgical debridements. Laser-generated shockwaves (LGS) is a novel, minimally invasive, and nonthermal modality for biofilm mechanical debridement which utilizes compressive stress waves, generated by photonic absorption in thin titanium films to mechanically disrupt the biofilm. Prior studies have demonstrated LGS monotherapy to be selectively efficacious for biofilm disruption and safe for host tissues. In this study, we sought to determine if LGS can enhance the antimicrobial activity and biofilm disruption capability of topical antibiotic therapy. STUDY DESIGN/MATERIALS AND METHODS Staphylococcus epidermidis biofilms grown in vitro on glass were treated with topical gentamicin (31, 62, and 124 μg/ml) with and without LGS (n = 3-11/treatment group). Mechanical shockwaves were generated with a 1,064 nm Nd:YAG laser (laser fluence 110.14 mJ/mm2 , pulse duration 5 ns, spot size 3 mm). Following a 24-hour incubation period, bacterial viability was assessed by determining the number of colony-forming units (CFU) via the Miles and Misra method. Residual biofilm bioburden was analyzed using the crystal violet biofilm assay. RESULTS With gentamicin monotherapy, CFU density (CFU/mm2 ) at 31, 62, and 124 μg/ml were (282 ± 84) × 104 , (185 ± 34) × 104 , and (113 ± 9) × 104 , respectively. With LGS and gentamicin therapy, CFU density decreased to (170 ± 44) × 104 , (89 ± 24) × 104 , and (43 ± 3) × 104 , respectively (P = 0.1704, 0.0302, and 0.0004 when compared with gentamicin alone). Biofilm burden as measured by the assay in the gentamicin 31, 62, and 124 μg/ml groups was reduced by 80%, 95%, and 98% when LGS was added (P = 0.0102, >0.0001, and 0.0001 for all groups when compared with gentamicin alone). Furthermore, samples treated with LGS saw an increase in susceptibility to gentamicin, in terms of reduced biofilm bioburden and CFU densities. CONCLUSION LGS enhances the efficacy of topical antibiotics in an in vitro model. This has significant implications for clinical applications in the management of chronic soft tissue infections and recalcitrant chronic rhinosinusitis. Lasers Surg. Med. 49:539-547, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- William Yao
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Science, University of California (UCLA), Los Angeles, California
| | - Edward C Kuan
- Department of Head and Neck Surgery, UCLA Medical Center, Los Angeles, California
| | - Nathan C Francis
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Science, University of California (UCLA), Los Angeles, California
| | - Maie A St John
- Department of Head and Neck Surgery, UCLA Medical Center, Los Angeles, California
| | - Warren S Grundfest
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Science, University of California (UCLA), Los Angeles, California
| | - Zachary D Taylor
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Science, University of California (UCLA), Los Angeles, California
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17
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Pastells C, Acosta G, Pascual N, Albericio F, Royo M, Marco MP. An immunochemical strategy based on peptidoglycan synthetic peptide epitopes to diagnose Staphylococcus aureus infections. Anal Chim Acta 2015; 889:203-11. [DOI: 10.1016/j.aca.2015.07.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 07/07/2015] [Accepted: 07/16/2015] [Indexed: 11/24/2022]
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18
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Percival SL, Francolini I, Donelli G. Low-level laser therapy as an antimicrobial and antibiofilm technology and its relevance to wound healing. Future Microbiol 2015; 10:255-72. [DOI: 10.2217/fmb.14.109] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
ABSTRACT The biostimulative effect of low-level laser therapy (LLLT) in tissues has been noted in reference to the treatment of various diseases but little information exists on its effectiveness on chronic wounds and biofilm. The scope of this review was to identify literature reporting on LLLT alone, without photodynamic agents, as an antimicrobial/antibiofilm technology and determine its effects on wound healing. Overall the beneficial effects of LLLT in promoting wound healing in animal and human studies has been demonstrated. However, the lack of credible studies using reproducible models and light dosimetry restricts the analysis of current data. Efforts must be addressed to standardize phototherapy procedures as well as to develop suitable in vitro and in vivo biofilm models to test LLLT efficacy in promoting biofilm eradication and wound healing.
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Affiliation(s)
- Steven L Percival
- Surface Science Research Centre, University of Liverpool, Liverpool, UK
- Institute of Ageing & Chronic Disease, University of Liverpool, Liverpool, UK
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19
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Kim MK, Drescher K, Pak OS, Bassler BL, Stone HA. Filaments in curved streamlines: Rapid formation of Staphylococcus aureus biofilm streamers. NEW JOURNAL OF PHYSICS 2014; 16:065024. [PMID: 25484614 PMCID: PMC4255984 DOI: 10.1088/1367-2630/16/6/065024] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Biofilms are surface-associated conglomerates of bacteria that are highly resistant to antibiotics. These bacterial communities can cause chronic infections in humans by colonizing, for example, medical implants, heart valves, or lungs. Staphylococcus aureus, a notorious human pathogen, causes some of the most common biofilm-related infections. Despite the clinical importance of S. aureus biofilms, it remains mostly unknown how physical effects, in particular flow, and surface structure influence biofilm dynamics. Here we use model microfluidic systems to investigate how environmental factors, such as surface geometry, surface chemistry, and fluid flow affect biofilm development in S. aureus. We discovered that S. aureus rapidly forms flow-induced, filamentous biofilm streamers, and furthermore if surfaces are coated with human blood plasma, streamers appear within minutes and clog the channels more rapidly than if the channels are uncoated. To understand how biofilm streamer filaments reorient in flows with curved streamlines to bridge the distances between corners, we developed a mathematical model based on resistive force theory of slender filaments. Understanding physical aspects of biofilm formation in S. aureus may lead to new approaches for interrupting biofilm formation of this pathogen.
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Affiliation(s)
| | - Knut Drescher
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544
| | - On Shun Pak
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
| | - Bonnie L. Bassler
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544
- Howard Hughes Medical Institute, Chevy Chase, MD 20815
| | - Howard A. Stone
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
- Corresponding author:
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20
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Mena Viveros N. Biofilms in Otolaryngology. ACTA OTORRINOLARINGOLOGICA ESPANOLA 2014. [DOI: 10.1016/j.otoeng.2014.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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Mena Viveros N. Biofilms en otorrinolaringología. ACTA OTORRINOLARINGOLOGICA ESPANOLA 2014; 65:47-52. [DOI: 10.1016/j.otorri.2012.08.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2012] [Revised: 06/28/2012] [Accepted: 08/06/2012] [Indexed: 10/27/2022]
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22
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Silva DCGGE, Plapler H, Costa MMD, Silva SRGE, Sá MDCAD, Silva BSLE. Low level laser therapy (AlGaInP) applied at 5J/cm2 reduces the proliferation of Staphylococcus aureus MRSA in infected wounds and intact skin of rats. An Bras Dermatol 2013; 88:50-5. [PMID: 23539003 PMCID: PMC3699931 DOI: 10.1590/s0365-05962013000100005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2012] [Accepted: 03/15/2012] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Laser therapy is a low cost, non-invasive procedure with good healing results. Doubts exist as to whether laser therapy action on microorganisms can justify research aimed at investigating its possible effects on bacteria-infected wounds. OBJECTIVE To assess the effect of low intensity laser on the rate of bacterial contamination in infected wounds in the skin of rats. METHODS An experimental study using 56 male Wistar rats. The animals were randomly divided into eight groups of seven each. Those in the "infected" groups were infected by Staphylococcus aureus MRSA in the dorsal region. Red laser diode (AlGaInP) 658nm, 5J/cm2 was used to treat the animals in the "treated" groups in scan for 3 consecutive days. Samples were drawn before inoculating bacteria and following laser treatment. For statistical analysis we used the nonparametric Wilcoxon (paired data) method with a significance level of p <0.05. RESULTS The statistical analysis of median values showed that the groups submitted to laser treatment had low bacterial proliferation. CONCLUSION The laser (AlGaInP), with a dose of 5J/cm2 in both intact skin and in wounds of rats infected with Staphylococcus aureus MRSA, is shown to reduce bacterial proliferation.
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Ordinola-Zapata R, Bramante CM, Aprecio RM, Handysides R, Jaramillo DE. Biofilm removal by 6% sodium hypochlorite activated by different irrigation techniques. Int Endod J 2013; 47:659-66. [DOI: 10.1111/iej.12202] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Accepted: 10/05/2013] [Indexed: 11/29/2022]
Affiliation(s)
- R. Ordinola-Zapata
- Department of Endodontics; Dental School of Bauru; University of São Paulo; Bauru Brazil
| | - C. M. Bramante
- Department of Endodontics; Dental School of Bauru; University of São Paulo; Bauru Brazil
| | - R. M. Aprecio
- Department of Endodontics; School of Dentistry; Loma Linda University; Loma Linda CA USA
| | - R. Handysides
- Department of Endodontics; School of Dentistry; Loma Linda University; Loma Linda CA USA
| | - D. E. Jaramillo
- Department of Endodontics; School of Dentistry; Loma Linda University; Loma Linda CA USA
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Naghdi S, Ansari NN, Fathali M, Bartley J, Varedi M, Honarpishe R. A pilot study into the effect of low-level laser therapy in patients with chronic rhinosinusitis. Physiother Theory Pract 2013; 29:596-603. [PMID: 23521568 DOI: 10.3109/09593985.2013.775204] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Chronic rhinosinusitis (CRS) is a common inflammatory disease of the nose and paranasal sinuses that has a significant impact on patients' quality of life. No study has examined the effectiveness of applying low-level laser therapy (LLLT) locally over the sinuses in patients with CRS. The aim of this study was to evaluate the effect of LLLT in patients with CRS. Fifteen adult patients with CRS participated in this pilot pretest-posttest clinical study. Patients were treated with a 830-nm Ga-Al-As laser in continuous-wave mode at a power output of 30 mW and energy dose of 1 J. Laser irradiation was delivered on six points over each maxillary or frontal sinus with 33 sec irradiation for each point and a total treatment duration of 198 sec for each sinus. Patients were given LLLT three times per week for ten treatment sessions. Patients were asked to score their symptoms in accordance with a four-point scale (0-3), and a total symptom score (TSS) for each patient was calculated. Percentage improvement of TSS was considered as the primary outcome measure. TSS was calculated at baseline (T0), at 2 weeks (T1) and at 4 weeks (T2). The TSS was improved significantly at T1 (39%) and at T2 (46.34%). A large effect size for LLLT was found (ηp(2) ηp(2) = 0.63). The therapeutic effect was sustained for a mean of 5 months. This pilot study indicates that LLLT applied for 4 weeks improves symptoms in patients with CRS.
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Affiliation(s)
- Soofia Naghdi
- Assistant Professor, Department of Physiotherapy, School of Rehabilitation , Tehran University of Medical Sciences , Tehran , Iran
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25
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Mancl KA, Kirsner RS, Ajdic D. Wound biofilms: lessons learned from oral biofilms. Wound Repair Regen 2013; 21:352-62. [PMID: 23551419 DOI: 10.1111/wrr.12034] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Accepted: 12/25/2012] [Indexed: 12/17/2022]
Abstract
Biofilms play an important role in the development and pathogenesis of many chronic infections. Oral biofilms, more commonly known as dental plaque, are a primary cause of oral diseases including caries, gingivitis, and periodontitis. Oral biofilms are commonly studied as model biofilm systems as they are easily accessible; thus, biofilm research in oral diseases is advanced with details of biofilm formation and bacterial interactions being well elucidated. In contrast, wound research has relatively recently directed attention to the role biofilms have in chronic wounds. This review discusses the biofilms in periodontal disease and chronic wounds with comparisons focusing on biofilm detection, biofilm formation, the immune response to biofilms, bacterial interaction, and quorum sensing. Current treatment modalities used by both fields and future therapies are also discussed.
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Affiliation(s)
- Kimberly A Mancl
- Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida 33136, USA
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26
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Chen T, Wang R, Xu LQ, Neoh KG, Kang ET. Carboxymethyl Chitosan-Functionalized Magnetic Nanoparticles for Disruption of Biofilms of Staphylococcus aureus and Escherichia coli. Ind Eng Chem Res 2012. [DOI: 10.1021/ie301522w] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tong Chen
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore
117576, Singapore
| | - Rong Wang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore
117576, Singapore
| | - Li Qun Xu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore
117576, Singapore
| | - Koon Gee Neoh
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore
117576, Singapore
| | - En-Tang Kang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore
117576, Singapore
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Laser-assisted nasal decolonization of Staphylococcus aureus, including methicillin-resistant Staphylococcus aureus. Am J Otolaryngol 2012; 33:572-5. [PMID: 22503099 DOI: 10.1016/j.amjoto.2012.02.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 02/03/2012] [Accepted: 02/13/2012] [Indexed: 11/22/2022]
Abstract
OBJECTIVES Methicillin-sensitive Staphylococcus aureus (MSSA) and methicillin-resistant S aureus (MRSA) contribute to 25% of nosocomial infections, increasing complications, health care cost, and growing antibiotic resistance. Nasal decolonization (ND) can reduce the staphylococcal infection rate. A new method of laser therapy (LT) MRSA ND was tested. STUDY DESIGN This is a prospective, nonrandomized study. METHODS Following institutional review board approvals, 25 patients colonized with MSSA/MRSA were allocated to 4 treatment arms; low-power, dual-wavelength 870-/930-nm laser alone (GR1); low-power, dual-wavelength laser followed by erythromycin (E-mycin) cream (GR2); low-power, dual-wavelength laser followed by peroxide irrigation (GR3); and high-power 940-nm laser alone (GR4). Quantitative cultures were obtained before and after in all arms. Laser therapy was performed via a laser fiber diffuser, delivering 200 to 600 J/cm² to each naris circumferentially. Patient's distribution was 3 in GR1, 14 in GR2, 4 in GR3, and 4 in GR4 (last 10 recruited to GR4). RESULTS Nasal decolonization for GR1, GR2, GR3, and GR4 was 1 of 3, 13 of 14, 2 of 4, and 4 of 4, respectively. Because LT + E-mycin cleared all first 3 patients of MRSA and MSSA, all remaining patients were treated with LT + Er with over 90% of patients clearing. No adverse events or discomfort were reported. CONCLUSIONS First human study using LT and topical E-mycin in ND is presented. Laser therapy can eradicate MRSA and potentially resensitization of bacteria to the antimicrobial effect of erythromycin. Although decolonization was maintained at 4 weeks posttreatment, further studies can determine the LT long-term effect.
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Basso FG, Oliveira CF, Fontana A, Kurachi C, Bagnato VS, Spolidório DMP, Hebling J, de Souza Costa CA. In Vitro effect of low-level laser therapy on typical oral microbial biofilms. Braz Dent J 2012; 22:502-10. [PMID: 22189647 DOI: 10.1590/s0103-64402011000600011] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2011] [Accepted: 10/29/2011] [Indexed: 11/21/2022] Open
Abstract
The aim of this study was to evaluate the effect of specific parameters of low-level laser therapy (LLLT) on biofilms formed by Streptococcus mutans, Candida albicans or an association of both species. Single and dual-species biofilms--SSB and DSB--were exposed to laser doses of 5, 10 or 20 J/cm(2) from a near infrared InGaAsP diode laser prototype (LASERTable; 780 ± 3 nm, 0.04 W). After irradiation, the analysis of biobilm viability (MTT assay), biofilm growth (cfu/mL) and cell morphology (SEM) showed that LLLT reduced cell viability as well as the growth of biofilms. The response of S. mutans (SSB) to irradiation was similar for all laser doses and the biofilm growth was dose dependent. However, when associated with C. albicans (DSB), S. mutans was resistant to LLLT. For C. albicans, the association with S. mutans (DSB) caused a significant decrease in biofilm growth in a dose-dependent fashion. The morphology of the microorganisms in the SSB was not altered by LLLT, while the association of microbial species (DSB) promoted a reduction in the formation of C. albicans hyphae. LLLT had an inhibitory effect on the microorganisms, and this capacity can be altered according to the interactions between different microbial species.
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Affiliation(s)
- Fernanda G Basso
- Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
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Nowatzki PJ, Koepsel RR, Stoodley P, Min K, Harper A, Murata H, Donfack J, Hortelano ER, Ehrlich GD, Russell AJ. Salicylic acid-releasing polyurethane acrylate polymers as anti-biofilm urological catheter coatings. Acta Biomater 2012; 8:1869-80. [PMID: 22342353 DOI: 10.1016/j.actbio.2012.01.032] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 01/23/2012] [Accepted: 01/26/2012] [Indexed: 01/20/2023]
Abstract
Biofilm-associated infections are a major complication of implanted and indwelling medical devices like urological and venous catheters. They commonly persist even in the presence of an oral or intravenous antibiotic regimen, often resulting in chronic illness. We have developed a new approach to inhibiting biofilm growth on synthetic materials through controlled release of salicylic acid from a polymeric coating. Herein we report the synthesis and testing of a ultraviolet-cured polyurethane acrylate polymer composed, in part, of salicyl acrylate, which hydrolyzes upon exposure to aqueous conditions, releasing salicylic acid while leaving the polymer backbone intact. The salicylic acid release rate was tuned by adjusting the polymer composition. Anti-biofilm performance of the coatings was assessed under several biofilm forming conditions using a novel combination of the MBEC Assay™ biofilm multi-peg growth system and bioluminescence monitoring for live cell quantification. Films of the salicylic acid-releasing polymers were found to inhibit biofilm formation, as shown by bioluminescent and GFP reporter strains of Pseudomonas aeruginosa and Escherichia coli. Urinary catheters coated on their inner lumens with the salicylic acid-releasing polymer significantly reduced biofilm formation by E. coli for up to 5 days under conditions that simulated physiological urine flow.
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Baffoni M, Bessa LJ, Grande R, Di Giulio M, Mongelli M, Ciarelli A, Cellini L. Laser irradiation effect on Staphylococcus aureus and Pseudomonas aeruginosa biofilms isolated from venous leg ulcer. Int Wound J 2011; 9:517-24. [PMID: 22182280 DOI: 10.1111/j.1742-481x.2011.00910.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Chronic wounds, including diabetic foot ulcers, pressure ulcers and venous leg ulcers, represent a significant cause of morbidity in developed countries, predominantly in older patients. The aetiology of these wounds is probably multifactorial, but the role of bacteria in their pathogenesis is still unclear. Moreover, the presence of bacterial biofilms has been considered an important factor responsible for wounds chronicity. We aimed to investigate the laser action as a possible biofilm eradicating strategy, in order to attempt an additional treatment to antibiotic therapy to improve wound healing. In this work, the effect of near-infrared (NIR) laser was evaluated on mono and polymicrobial biofilms produced by two pathogenic bacterial strains, Staphylococcus aureus PECHA10 and Pseudomonas aeruginosa PECHA9, both isolated from a chronic venous leg ulcer. Laser effect was assessed by biomass measurement, colony forming unit count and cell viability assay. It was shown that the laser treatment has not affected the biofilms biomass neither the cell viability, although a small disruptive action was observed in the structure of all biofilms tested. A reduction on cell growth was observed in S. aureus and in polymicrobial biofilms. This work represents an initial in vitro approach to study the influence of NIR laser treatment on bacterial biofilms in order to explain its potentially advantageous effects in the healing process of chronic infected wounds.
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Affiliation(s)
- Marina Baffoni
- Department of Biomedical Sciences, University G. d'Annunzio, Chieti-Pescara, Via di Vestini 31, Chieti, Italy
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