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Stefanetti V, Passamonti F, Rampacci E. Antimicrobial Strategies Proposed for the Treatment of S. pseudintermedius and Other Dermato-Pathogenic Staphylococcus spp. in Companion Animals: A Narrative Review. Vet Sci 2024; 11:311. [PMID: 39057995 PMCID: PMC11281426 DOI: 10.3390/vetsci11070311] [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: 05/31/2024] [Revised: 07/03/2024] [Accepted: 07/09/2024] [Indexed: 07/28/2024] Open
Abstract
The treatment of dermato-pathogenic Staphylococcus spp., particularly Staphylococcus pseudintermedius, in companion animals presents significant challenges due to rising antimicrobial resistance. This review explores innovative strategies to combat these infections. We examined novel antimicrobials and the repurposing of existing drugs to enhance their efficacy against resistant strains. Additionally, we evaluate the potential of natural products, nanomaterials, and skin antiseptics as alternative treatments. The review also investigates the use of antimicrobial peptides and bacteriophages, highlighting their targeted action against staphylococcal pathogens. Furthermore, the role of adjuvants in antibiotic treatments, such as antimicrobial resistance breakers, is discussed, emphasizing their ability to enhance therapeutic outcomes. Our analysis underscores the importance of a multifaceted approach in developing effective antimicrobial strategies for companion animals, aiming to mitigate resistance and improve clinical management of staphylococcal skin infections.
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Affiliation(s)
- Valentina Stefanetti
- Department of Human Science and Promotion of Quality Life, San Raffaele Telematic University, 00166 Rome, Italy;
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy;
| | - Fabrizio Passamonti
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy;
| | - Elisa Rampacci
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy;
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Marchegiani A, Troisi A, Bazzano M, Spaterna A, Fruganti A. A Prospective, Blinded, Open-Label Clinical Trial to Assess the Ability of Fluorescent Light Energy to Enhance Wound Healing after Mastectomy in Female Dogs. Animals (Basel) 2024; 14:1250. [PMID: 38672398 PMCID: PMC11047670 DOI: 10.3390/ani14081250] [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: 03/22/2024] [Revised: 04/18/2024] [Accepted: 04/22/2024] [Indexed: 04/28/2024] Open
Abstract
Mammary gland tumors represent the most frequently diagnosed malignant neoplasm in intact female dogs, and surgical removal represents the current gold standard treatment. To promote wound healing and prevent possible bacterial contamination, perioperative antimicrobials are commonly used in clinical practice, even though there are no publications establishing guidelines for the use of such drugs in canine mastectomy. The aim of the present study was to evaluate the ameliorative effect of fluorescent light energy on the quality of the healing process after mastectomy surgery in female dogs, in the absence of perioperative antimicrobial administration. Nine female dogs received a multiple-gland mastectomy due to gland tumors and received FLE application immediately after surgery and then five days after. The surgical incisions were evaluated by a blind investigator over time using the Modified Hollander Cosmesis and Modified Draize Wound Healing Score systems. Statistical analysis revealed a significant ameliorative effect of FLE in the control of step-off borders, contour irregularities, and excessive distortion. In addition, erythema, edema, and serous discharge were lower for those wounds managed with FLE. These results underscore the advantageous impact of FLE on the healing of post-mastectomy wounds in female dogs, offering the dual benefits of reducing potential infection risks and lessening the home care burden for pet owners.
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Affiliation(s)
| | | | - Marilena Bazzano
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy; (A.M.); (A.T.); (A.S.); (A.F.)
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Lundberg AT, Hathcock T, Kennis RA, White AG. In vitro evaluation of bactericidal effects of fluorescent light energy on Staphylococcus pseudintermedius and S. aureus. Vet Dermatol 2024; 35:166-174. [PMID: 38177510 DOI: 10.1111/vde.13235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 11/02/2023] [Accepted: 12/16/2023] [Indexed: 01/06/2024]
Abstract
BACKGROUND Staphylococcus pseudintermedius and S. aureus are bacterial species of importance in veterinary medicine. The increasing incidence of antibiotic resistance necessitates the implementation of novel treatment modalities. Fluorescent light energy (FLE) is used as an adjunctive and primary treatment for canine pyoderma. However, no in vitro studies exist investigating its bactericidal effects against S. pseudintermedius or S. aureus. OBJECTIVES To determine the bactericidal effects of FLE on S. pseudintermedius and S. aureus isolates. MATERIALS AND METHODS Two meticillin-susceptible S. pseudintermedius (MSSP) isolates, three meticillin-resistant S. pseudintermedius (MRSP) isolates and one meticillin-resistant S. aureus (MRSA) isolate were studied. A commercially available blue light-emitting diode (bLED) lamp and photoconverting hydrogel FLE system was used. All bacteria were exposed to five conditions following inoculation: (i) no treatment (control); (ii) blue light (bLED) once; (iii) bLED twice consecutively; (iv) FLE (bLED and photoconverting hydrogel) once; and (v) FLE (bLED and photoconverting hydrogel) twice consecutively. Each individual exposure was 2 min long. RESULTS No statistically significant differences (p < 0.05) were found for any treatment group when each bacterial isolate was evaluated individually, MSSP isolates were grouped, MRSP isolates were grouped, when all S. pseudintermedius isolates were combined, or when all isolates of both Staphylococcus species were combined. CONCLUSIONS AND CLINICAL RELEVANCE While clinical success is reported when using FLE to treat Staphylococcus infections in animals, no in vitro antibacterial efficacy was identified for S. pseudintermedius or S. aureus under experimental conditions. The clinical success observed with FLE may be the result of a more complex in vivo response.
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Affiliation(s)
- Annette T Lundberg
- College of Veterinary Medicine, Department of Clinical Sciences, Auburn University, Auburn, Alabama, USA
| | - Terri Hathcock
- College of Veterinary Medicine, Department of Pathobiology, Auburn University, Auburn, Alabama, USA
| | - Robert A Kennis
- College of Veterinary Medicine, Department of Clinical Sciences, Auburn University, Auburn, Alabama, USA
| | - Amelia G White
- College of Veterinary Medicine, Department of Clinical Sciences, Auburn University, Auburn, Alabama, USA
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Marchegiani A, Spaterna A, Fruganti A, Cerquetella M. Exploring fluorescent light energy as management option for canine superficial bacterial folliculitis. Front Vet Sci 2023; 10:1155105. [PMID: 37332738 PMCID: PMC10272430 DOI: 10.3389/fvets.2023.1155105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 05/18/2023] [Indexed: 06/20/2023] Open
Abstract
Superficial bacterial folliculitis (SBF) represents a common dermatological diagnosis in dogs that can be successfully managed with either topical and/or systemic treatments. In the present study we evaluated the efficacy of a fluorescent light energy (FLE) device as sole management for SBF. The same FLE device has been shown, as adjunct therapy to systemic antibiotic or alone, to effectively control clinical manifestation of interdigital furunculosis. Twenty dogs were randomized to receive FLE once (six dogs) or twice (six dogs) weekly in comparison with oral anti-biotic (eight dogs) until complete healing. FLE regimen was able to significantly reduce the time needed to clinical resolution for oral antibiotic, supporting owners' compliance and welfare of dogs.
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Frey R, Varjonen K. A retrospective case series of the postoperative outcome for 30 dogs with inflammatory interdigital nodules, surgically treated with carbon dioxide laser and a nonantimicrobial wound-healing protocol. Vet Dermatol 2023; 34:150-155. [PMID: 36694420 DOI: 10.1111/vde.13146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 11/18/2022] [Accepted: 12/06/2022] [Indexed: 01/26/2023]
Abstract
BACKGROUND Inflammatory interdigital nodules (IIN) affecting the paws of dogs is a multifactorial and painful condition. Surgery using carbon dioxide (CO 2 ) laser has been shown to be helpful in the management. HYPOTHESIS/OBJECTIVES To assess a postoperative treatment protocol without use of antibiotics following CO2 laser surgery for IIN treatment. ANIMALS Forty-seven paws, in 30 client-owned dogs, with IINs affecting the interdigital web between the 4th and 5th digits of the forepaws, surgically treated using CO2 laser, were included. MATERIALS AND METHODS Medical records were reviewed for demographic details, medication use and wound healing using a set wound care protocol. Time to resolution of the surgical wounds and the postoperative outcome were assessed. RESULTS The mean healing time was 34 days. Resolution was seen in 42 of 47 paws with complications in five paws (11%), including development of new fistulae or nonhealing granulation tissue. Surgery was repeated in those five cases. Relapse occurred during the follow-up period of five-19 months in six paws (13%). CONCLUSIONS AND CLINICAL RELEVANCE This study shows that surgical treatment with CO2 laser for interdigital nodules is successful in most cases. The postoperative outcome using a wound-healing protocol avoiding use of antimicrobials can be used without compromising patient care whilst following antimicrobial stewardship guidelines.
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Millis DL, Bergh A. A Systematic Literature Review of Complementary and Alternative Veterinary Medicine: Laser Therapy. Animals (Basel) 2023; 13:ani13040667. [PMID: 36830454 PMCID: PMC9951699 DOI: 10.3390/ani13040667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/07/2023] [Accepted: 02/10/2023] [Indexed: 02/17/2023] Open
Abstract
Light therapy, or photobiomodulation, is a collective name for methods where tissue is irradiated with different types of light, with the aim of stimulating healing. Despite being frequently used, there is no consensus regarding the optimal treatment protocols for light therapy, nor its clinical efficacy. A systematic literature review was conducted, searching the relevant literature regarding light therapy in three databases, published between 1980-2020. The risk of bias in each article was evaluated. Forty-five articles met the inclusion criteria; 24 articles were regarding dogs, 1 was regarding cats, and the rest were regarding horses. The indications for treatment were musculoskeletal and neurologic conditions, skin disease and wounds, and pain. The literature review showed conflicting study results and unclear application for clinical use. This can be explained by the wide variety of treatment parameters used in the searched studies, such as wavelength, laser class, dose, and effect, as well as the frequency and duration of treatment. Although some beneficial effects were reported for light therapy, the studies also had limited scientific quality regarding these therapies, with a high or moderate risk of bias.
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Affiliation(s)
- Darryl L. Millis
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37996, USA
- Correspondence:
| | - Anna Bergh
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, SE 750 07 Uppsala, Sweden
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Marchegiani A, Fruganti A, Bazzano M, Cerquetella M, Dini F, Spaterna A. Fluorescent Light Energy in the Management of Multi Drug Resistant Canine Pyoderma: A Prospective Exploratory Study. Pathogens 2022; 11:1197. [PMID: 36297254 PMCID: PMC9608719 DOI: 10.3390/pathogens11101197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/03/2022] [Accepted: 10/17/2022] [Indexed: 02/10/2024] Open
Abstract
The increase in prevalence of staphylococcal antimicrobial resistance has been also associated with pyoderma in dogs, and prolonged antibiotic treatment, as often needed in severe cases of pyoderma, has been related to influencing possible development of multidrug resistance (MDR). Fluorescent light energy (FLE) has been indicated to improve pyoderma lesions as adjunct therapy to systemic antibiotics. In the present study, we evaluated the effect of FLE on clinical signs of MDR canine deep pyoderma (CDP) and interdigital furunculosis (CIF) when administered as solely management. Sixteen client-owned dogs affected by CIF (five dogs) and CDP (eleven dogs) were scored using a dedicated scoring system and received a single FLE applications twice weekly, until clinical resolution was achieved. Mean time to achieve complete resolution was 5.20 ± 3.56 weeks (median 3 weeks) for CIF cases and 4.18 ± 1.47 weeks (median 4 weeks) for CDP ones. FLE shows promise as an aid to managing clinical signs while reducing reliance on antibiotics for MDR CDP and CIF. In this study, FLE was responsible for the decrease in lesion scores and resolution of MDR pyoderma infection without any adjunct therapy, having a potential useful role to play in antibiotic stewardship programs, efficiently promoting complete clinical resolution of MDR lesions while optimizing the use of antibiotics.
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Affiliation(s)
| | | | - Marilena Bazzano
- School of Biosciences and Veterinary Medicine, University of Camerino, 62024 Matelica, Italy
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Critically Appraised Topic on Low-Level Laser Therapy (LLLT) in Dogs: An Advisable Treatment for Skin Diseases? Vet Sci 2022; 9:vetsci9090505. [PMID: 36136721 PMCID: PMC9502196 DOI: 10.3390/vetsci9090505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 08/26/2022] [Accepted: 09/12/2022] [Indexed: 11/25/2022] Open
Abstract
Simple Summary Low-level laser therapy (LLLT) is a therapeutic technique with reported regenerative, anti-inflammatory, antibacterial, and analgesic effects. In the last few years, LLLT has been used in dogs for the management of different skin lesions and diseases. This study reports a literature review using the critically appraised topic (CAT) method to determine the canine skin diseases for which LLLT is an advisable treatment. Only primary clinical prospective studies were considered. A meticulous literature search revealed 19 significant clinical trials, and these were critically analyzed. The evaluation of the best accessible evidence in July 2022 suggests that LLLT can be a promising and effective adjunctive treatment in combination with systemic antibiotic therapy for canine interdigital pyoderma and canine deep pyoderma. Furthermore, the use of LLLT is not recommended as a therapy for pedal pruritus secondary to canine atopic dermatitis. In other canine skin diseases, there is a possible helpful effect of LLLT; however, the evidence for its use is not currently convincing. Abstract Low-level laser therapy (LLLT) is a therapeutic option that stimulates cellular function through intracellular photobiological and photochemical reactions, promoting better tissue repair and an anti-inflammatory, antibacterial, and analgesic effect. Previous studies in human and veterinary medicine have shown the clinical efficacy of LLLT in many fields. In this study, the literature was reviewed using the critically appraised topic (CAT) method to determine the canine skin diseases for which LLLT is an advisable treatment. A meticulous literature search revealed 19 significant clinical trials, which were critically analyzed. The evaluation of the best accessible evidence in July 2022 suggests that fluorescence biomodulation (FBM), a type of LLLT, can, in combination with systemic antibiotic therapy, be a promising and effective adjunctive treatment for canine interdigital pyoderma and canine deep pyoderma. Furthermore, the evidence suggests that the use of LLLT is not recommended as a therapy for pedal pruritus secondary to canine atopic dermatitis. For other canine skin diseases included in the CAT, although LLLT appears to be a promising treatment, there is not yet good scientific evidence to recommend its use.
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Marchegiani A, Fruganti A, Gavazza A, Spaterna A, Cerquetella M. Fluorescence Biomodulation for Canine Interdigital Furunculosis: Updates for Once-Weekly Schedule. Front Vet Sci 2022; 9:880349. [PMID: 35795783 PMCID: PMC9251493 DOI: 10.3389/fvets.2022.880349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 05/31/2022] [Indexed: 11/13/2022] Open
Abstract
Interdigital furunculosis is a common multifactorial, inflammatory disease of the canine interdigital skin in which lesions commonly become secondarily infected. Fluorescence biomodulation (FBM) administered twice weekly has shown to effectively control clinical manifestation as adjunct therapy to systemic antibiotic. Since twice weekly regimen could be unaffordable for some pet owners, the aim of this study was to evaluate the effect of once weekly application of FBM in combination with systemic antibiotic on clinical manifestations of canine interdigital pyoderma, comparing the results to those present in literature. Twelve dogs diagnosed with interdigital pyoderma received antibiotic plus once weekly FBM application. Dogs were scored until complete healing based on global lesion score and neutrophil engulfing bacterial score. The results obtained demonstrated that once weekly application of FBM exerts the same beneficial effect on interdigital furunculosis healing as per twice weekly, indicating that once weekly regimen is well tolerated and is yielding similar results to twice weekly applications.
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Marchegiani A, Spaterna A, Cerquetella M. Current Applications and Future Perspectives of Fluorescence Light Energy Biomodulation in Veterinary Medicine. Vet Sci 2021; 8:20. [PMID: 33504091 PMCID: PMC7912178 DOI: 10.3390/vetsci8020020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/07/2021] [Accepted: 01/22/2021] [Indexed: 12/12/2022] Open
Abstract
The purpose of this review is to determine the state of the art of the mode of action and potential applications of fluorescence photobiomodulation in veterinary medicine. After a summary of the assets that have led the translation of such light-based therapies from bench side into clinical use, recent advances in canine dermatology using this brand-new approach are presented, and future scenarios where this type of care may provide benefits over the current standard care are highlighted.
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Affiliation(s)
- Andrea Marchegiani
- School of Biosciences and Veterinary Medicine, University of Camerino, 62024 Matelica, Italy; (A.S.); (M.C.)
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The Effectiveness of Fluorescent Light Energy as Adjunct Therapy in Canine Deep Pyoderma: A Randomized Clinical Trial. Vet Med Int 2021; 2021:6643416. [PMID: 33505646 PMCID: PMC7811420 DOI: 10.1155/2021/6643416] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 12/29/2020] [Accepted: 01/02/2021] [Indexed: 01/23/2023] Open
Abstract
A single centre, single-blinded, prospective, randomized, controlled clinical study was conducted to evaluate the effectiveness of twice weekly fluorescent light energy therapy (Phovia™) as adjunct to systemic antibiotics in the management of deep pyoderma in dogs. Dogs with clinical lesions consistent with deep pyoderma, positive bacterial culture, and showing neutrophil engulfing bacteria at cytology were included in the study. Assessments were undertaken weekly for 8 weeks and every 2 weeks thereafter until 12 weeks after enrolment. At each visit, lesions were scored and cytology was conducted to determine a neutrophil engulfing bacteria score. All dogs (Groups A and B) were treated with systemic antibiotic twice daily, and Group B received additionally Phovia twice weekly. Median treatment duration was 11.7 weeks for Group A and 5.7 weeks for Group B. After 8 weeks of treatment, the percentage of dogs that achieved clinical resolution was 35.0% and 88.0% for Groups A and B, respectively. Lesion scores showed highly statistically significant difference in favour of Group B from week 3 to 8, and neutrophil engulfing bacteria scores showed statistical difference from week 2 onwards in favour of Group B. These results indicate that Phovia, when used as an adjunct to systemic antibiotics, can accelerate time to clinical resolution in cases of canine deep pyoderma.
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Apostolopoulos N, Mayer U. Use of fluorescent light energy for the management of bacterial skin infection associated with canine calcinosis cutis lesions. VETERINARY RECORD CASE REPORTS 2020. [DOI: 10.1136/vetreccr-2020-001285] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
| | - Ursula Mayer
- DermatologyAniCura Kleitierspezialisten Augsburg GmbHAugsburgGermany
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Marchegiani A, Tambella AM, Fruganti A, Spaterna A, Cerquetella M, Paterson S. Management of canine perianal fistula with fluorescence light energy: preliminary findings. Vet Dermatol 2020; 31:460-e122. [PMID: 32914496 DOI: 10.1111/vde.12890] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 06/24/2020] [Accepted: 06/27/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND Canine perianal fistula (CPF) is a severe, painful, debilitating skin condition affecting the perianal skin. It often interferes with the quality of life of both dog and owner. Conventional medical treatment involves the use of immunosuppressive therapy; however, the successful resolution of lesions can be limited by poor owner compliance, adverse drug effects and dependence on costly therapies. HYPOTHESIS/OBJECTIVES The present study aimed to assess the potential benefits of fluorescent light energy (FLE) on cases of CPF. ANIMALS Four dogs with active perianal fistulas METHODS AND MATERIALS: FLE was applied as sole management therapy once a week with two consecutive applications in the same session for each dog until clinical signs had significantly improved, with weekly assessments for a six week period. Dogs were assessed by measuring the size of lesions at the start of the study and then weekly for six weeks, using planimetry software. Owners recorded vocalization and straining frequency scores during their pet's defaecation, and perianal licking frequency on a 0-5 point scale to assess the response to therapy. RESULTS All dogs improved with FLE, achieving a significant reduction in vocalization, straining and licking after two weeks (P = 0.002). After five weeks of FLE therapy, lesional areas had significantly decreased (P = 0.04). Only one dog required more than seven applications. No adverse events were reported. CONCLUSION AND CLINICAL IMPORTANCE FLE may be a promising alternative therapy for CPF.
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Affiliation(s)
- Andrea Marchegiani
- School of Biosciences and Veterinary Medicine, University of Camerino, via Circonvallazione 93/95, Matelica, Marche, I-62024, Italy
| | - Adolfo M Tambella
- School of Biosciences and Veterinary Medicine, University of Camerino, via Circonvallazione 93/95, Matelica, Marche, I-62024, Italy
| | - Alessandro Fruganti
- School of Biosciences and Veterinary Medicine, University of Camerino, via Circonvallazione 93/95, Matelica, Marche, I-62024, Italy
| | - Andrea Spaterna
- School of Biosciences and Veterinary Medicine, University of Camerino, via Circonvallazione 93/95, Matelica, Marche, I-62024, Italy
| | - Matteo Cerquetella
- School of Biosciences and Veterinary Medicine, University of Camerino, via Circonvallazione 93/95, Matelica, Marche, I-62024, Italy
| | - Susan Paterson
- Virtual Vet Derms Ltd., Lakeview, 3 High Birkrigg Park, Stainton, Kendal, LA8 0DY, UK
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Fluorescent Light Energy (FLE) Acts on Mitochondrial Physiology Improving Wound Healing. J Clin Med 2020; 9:jcm9020559. [PMID: 32085605 PMCID: PMC7073965 DOI: 10.3390/jcm9020559] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 01/30/2020] [Accepted: 02/06/2020] [Indexed: 12/12/2022] Open
Abstract
Fluorescent light energy (FLE) has been used to treat various injured tissues in a non-pharmacological and non-thermal fashion. It was applied to stimulate cell proliferation, accelerate healing in chronic and acute wounds, and reduce pain and inflammation. FLE has been shown to reduce pro-inflammatory cytokines while promoting an environment conducive to healing. A possible mechanism of action of FLE is linked to regulation of mitochondrial homeostasis. This work aims to investigate the effect of FLE on mitochondrial homeostasis in an in vitro model of inflammation. Confocal microscopy and gene expression profiling were performed on cultures of inflamed human dermal fibroblasts treated with either direct light from a multi-LED lamp, or FLE from either an amorphous gel or sheet hydrogel matrix. Assessment using confocal microscopy revealed mitochondrial fragmentation in inflamed cells, likely due to exposure to inflammatory cytokines, however, mitochondrial networks were restored to normal 24-h after treatment with FLE. Moreover, gene expression analysis found that treatment with FLE resulted in upregulation of uncoupling protein 1 (UCP1) and carnitine palmitoyltransferase 1B (CPT1B) genes, which encode proteins favoring mitochondrial ATP production through oxidative phosphorylation and lipid β-oxidation, respectively. These observations demonstrate a beneficial effect of FLE on mitochondrial homeostasis in inflamed cells.
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