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Preman NK, Amin N, Sanjeeva SG, Surya S, Kumar B S, Shenoy MM, Shastry RP, Johnson RP. Essential Oil Components Incorporated Emulsion Hydrogels for Eradicating Dermatophytosis Caused by Pathogenic Fungi Trichophyton mentagrophytes and Microsporum canis. Adv Healthc Mater 2024:e2400811. [PMID: 39138998 DOI: 10.1002/adhm.202400811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 08/01/2024] [Indexed: 08/15/2024]
Abstract
Dermatophytosis is a prevalent fungal infection and public health burden, majorly caused by the attack of zoophilic fungi genera of Trichophyton and Microsporum. Among them, T. mentagrophytes and M. canis are the dominating pathogens that cause dermatophytosis in humans. Though anti-fungal treatments are available, the widespread drug resistance and minimal efficacy of conventional therapies cause recurring infections. In addition, prolonged anti-fungal medications induce several systemic side effects, including hepatotoxicity and leucopenia. The anti-dermatophytic formulation of biocompatible essential oil components (EOCs) is attractive due to their highly potent anti-dermatophytic action. Herein, two EOCs, Eugenol (EU) and Isoeugenol (IU), incorporated emulsion hydrogel (EOCs-EHG) synthesized from hydroxypropylmethyl cellulose and poly(ethylene glycol) methyl ether methacrylate. The cytocompatibility of the hydrogels is confirmed by treating them with fibroblast and keratinocyte cell lines. The EOCs-EHG demonstrated pH and temperature-responsive sustained release of entrapped EOCs and inhibited fungal spore germination. T. mentagrophytes and M. canis biofilms are eradicated at a minimal inhibitory concentration of 2 µg mL-1 each of EU and IU. The in vivo anti-dermatophytic activity of EOCs-EHG is confirmed in dermatophyte-infected Wistar albino rat models. The topical application of EOCs-EHG demonstrated complete infection eradication and facilitated skin regeneration, emphasizing the therapeutic potential of EOCs-EHG against dermatophytosis.
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Affiliation(s)
- Namitha K Preman
- Polymer Nanobiomaterials Research Laboratory, Smart Materials and Devices (SMAD) Division, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, 575018, India
| | - Nikhitha Amin
- Department of Dermatology, Venereology and Leprosy, Yenepoya Medical College, Yenepoya (Deemed to be University), Mangalore, 575018, India
| | - Sandesh G Sanjeeva
- Polymer Nanobiomaterials Research Laboratory, Smart Materials and Devices (SMAD) Division, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, 575018, India
| | - Suprith Surya
- Advanced Surgical Skill ENhancement Division (ASSEND), Yenepoya (Deemed to be University), Mangalore, 575018, India
| | - Sukesh Kumar B
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, 575018, India
| | - Manjunath M Shenoy
- Department of Dermatology, Venereology and Leprosy, Yenepoya Medical College, Yenepoya (Deemed to be University), Mangalore, 575018, India
| | - Rajesh P Shastry
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, 575018, India
| | - Renjith P Johnson
- Polymer Nanobiomaterials Research Laboratory, Smart Materials and Devices (SMAD) Division, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, 575018, India
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Baumbach CM, Anantama NA, Savkovic V, Mülling CKW, Schinköthe J, Michler JK. 3D Approaches to Culturing Bovine Skin: Explant Culture versus Organotypic Skin Model. Cells Tissues Organs 2024; 213:424-438. [PMID: 38508156 PMCID: PMC11446480 DOI: 10.1159/000538438] [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: 11/09/2023] [Accepted: 03/16/2024] [Indexed: 03/22/2024] Open
Abstract
INTRODUCTION Digital dermatitis (DD) in cattle appears with high prevalence; nevertheless, the knowledge on its pathogenesis is still limited. In this context, in vitro skin models represent a valuable tool to facilitate the study of DD. METHODS Two in vitro skin models were established using bovine distal limb skin: a skin explant model and an organotypic skin model. For the skin explant model, skin samples were cultured with an air-liquid interface for up to 7 days. Besides routine histopathological examination, readout parameters were Ki-67 and cleaved Caspase-3 stainings. For the organotypic model, primary keratinocytes were layered on top of a dermal equivalent containing mainly mitotically inactive fibroblasts and maintained for up to 21 days. At regular intervals (days 7, 14, and 21), cultured skin samples were taken for (immuno)histological analysis. RESULTS Both cultures could be maintained for the entire duration of the intended culture period. In the histopathological assessment, explant skin cultures showed ballooning degeneration of keratinocytes and segmental necrosis starting at day 5 of culturing. Initially, basal keratinocytes in the organotypic model differentiated as demonstrated by positive Keratin 14, Desmoglein-1, Loricrin, and Involucrin immunofluorescent stainings. Ki-67 was observed occasionally and suprabasally still after 21 days of culture. CONCLUSION Both in vitro models proved dependable and constitute a viable option for replacing experiments on live animals, each with its own benefits. Whereas skin explants include all cell types available in vivo and can therefore reflect realistic cell-cell interactions and signaling pathways, the organotypic model offers a higher standardization and reproducibility. Depending on the focus of future studies, both models can be used for specific experimental purposes of bovine dermatological research in general or specialized questions concerning (infectious) claw diseases as, e.g., DD.
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Affiliation(s)
- Christina-Marie Baumbach
- Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Nadia Ayurini Anantama
- Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Vuk Savkovic
- Department of Oral and Maxillofacial Surgery, Leipzig University Medical Center, Leipzig, Germany
| | - Christoph K W Mülling
- Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Jan Schinköthe
- Institute of Veterinary Pathology, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Jule Kristin Michler
- Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
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Herrada J, Gamal A, Long L, Ghannoum MA. In Vivo Skin Colonization and Decolonization Models for Candida auris. Methods Mol Biol 2022; 2517:269-285. [PMID: 35674962 DOI: 10.1007/978-1-0716-2417-3_22] [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] [Indexed: 06/15/2023]
Abstract
Candida auris infections present a critical problem to the healthcare system in many parts of the world. This yeast clinically manifests as a disseminated candidiasis which can be life-threating for susceptible individuals, as well as cutaneous and wound infections. Moreover, C. auris can colonize the skin and act as a nidus of infection. Importantly, this emerging yeast unlike other Candida spp. has demonstrated multidrug resistance; thus its eradication can be challenging. Animal models are important to gain insight into the pathogenesis of this infection, as well as play a significant role in drug development. In this chapter, we describe two C. auris animal models: a cutaneous infection guinea pig model and a skin decolonization mouse model.
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Affiliation(s)
- Janet Herrada
- Center for Medical Mycology, University Hospitals Cleveland Medical Center and Case Western Reserve University, Cleveland, OH, USA
| | - Ahmed Gamal
- Center for Medical Mycology, University Hospitals Cleveland Medical Center and Case Western Reserve University, Cleveland, OH, USA
| | - Lisa Long
- Center for Medical Mycology, University Hospitals Cleveland Medical Center and Case Western Reserve University, Cleveland, OH, USA
| | - Mahmoud A Ghannoum
- Center for Medical Mycology, University Hospitals Cleveland Medical Center and Case Western Reserve University, Cleveland, OH, USA.
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Comprehensive Assessment of the Virulence Factors sub 3, sub 6 and mcpA in the Zoonotic Dermatophyte Trichophyton benhamiae Using FISH and qPCR. J Fungi (Basel) 2021; 8:jof8010024. [PMID: 35049964 PMCID: PMC8778074 DOI: 10.3390/jof8010024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/17/2021] [Accepted: 12/24/2021] [Indexed: 11/17/2022] Open
Abstract
Skin infections by keratinophilic fungi are commonly referred to as dermatophytosis and represent a major health burden worldwide. Although patient numbers are on the rise, data on virulence factors, their function and kinetics are scarce. We employed an ex vivo infection model based on guinea pig skin explants (GPSE) for the zoonotic dermatophyte Trichophyton (T.) benhamiae to investigate kinetics of the virulence factors subtilisin (sub) 3, sub 6, metallocarboxypeptidase A (mcpA) and isocitrate lyase (isol) at gene level for ten days. Fluorescence in situ hybridization (FISH) and quantitative polymerase chain reaction (qPCR) were used to detect and quantify the transcripts, respectively. Kingdom-spanning, species-specific and virulence factor-specific probes were successfully applied to isolated fungal elements showing inhomogeneous fluorescence signals along hyphae. Staining results for inoculated GPSE remained inconsistent despite thorough optimization. qPCR revealed a significant increase of sub 3- and mcpA-transcripts toward the end of culture, sub 6 and isol remained at a low level throughout the entire culture period. Sub 3 is tightly connected to the de novo formation of conidia during culture. Since sub 6 is considered an in vivo disease marker. However, the presented findings urgently call for further research on the role of certain virulence factors during infection and disease.
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Towards a Standardized Procedure for the Production of Infective Spores to Study the Pathogenesis of Dermatophytosis. J Fungi (Basel) 2021; 7:jof7121029. [PMID: 34947011 PMCID: PMC8709344 DOI: 10.3390/jof7121029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 11/23/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022] Open
Abstract
Dermatophytoses are superficial infections of human and animal keratinized tissues caused by filamentous fungi named dermatophytes. Because of a high and increasing incidence, as well as the emergence of antifungal resistance, a better understanding of mechanisms involved in adhesion and invasion by dermatophytes is required for the further development of new therapeutic strategies. In the last years, several in vitro and in vivo models have emerged to study dermatophytosis pathogenesis. However, the procedures used for the growth of fungi are quite different, leading to a highly variable composition of inoculum for these models (microconidia, arthroconidia, hyphae), thus rendering difficult the global interpretation of observations. We hereby optimized growth conditions, including medium, temperature, atmosphere, and duration of culture, to improve the sporulation and viability and to favour the production of arthroconidia of several dermatophyte species, including Trichophyton rubrum and Trichophyton benhamiae. The resulting suspensions were then used as inoculum to infect reconstructed human epidermis in order to validate their ability to adhere to and to invade host tissues. By this way, this paper provides recommendations for dermatophytes culture and paves the way towards a standardized procedure for the production of infective spores usable in in vitro and in vivo experimental models.
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Lindenhahn J, Bartosch T, Baumbach CM, Suchowski M, Kacza J, Schrödl W, Michler JK. Detection of subtilisin 3 and 6 in skin biopsies of cattle with clinically manifested bovine ringworm. Med Mycol 2021; 59:305-308. [PMID: 33085766 DOI: 10.1093/mmy/myaa089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/21/2020] [Accepted: 10/01/2020] [Indexed: 01/25/2023] Open
Abstract
Trichophyton (T.) verrucosum is a highly pathogenic dermatophyte causing zoonotic bovine ringworm that is transmissible to humans. The virulence factors subtilisin (Sub)3 and Sub6 are discussed to contribute to disease manifestation but no protein expression study is available for T. verrucosum. We used customized antibodies (against Trichophyton-species, Sub3 and Sub6) to examine skin biopsies of infected cattle via immunofluorescence stainings. Both virulence factors Sub3 and 6 were solely expressed by conidia and not only found in epidermal but also in dermal and hair structures. The anti-T-antibody reliably detected the fungus and proved more sensitive compared to histological stains. LAY SUMMARY We examined the zoonotic dermatophyte Trichophyton (T.) verrucosum in bovine skin and studied two important virulence factors called subtilisin (Sub)3 and Sub6 that T. verrucosum produces and secretes using immunolabeling.
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Affiliation(s)
- Jakob Lindenhahn
- Faculty of Veterinary Medicine, Institute of Bacteriology and Mycology, Leipzig University, Leipzig, Germany
| | - Theresa Bartosch
- Saxon State Laboratory of Health and Veterinary Affairs, Chemnitz, Germany
| | - Christina-Marie Baumbach
- Faculty of Veterinary Medicine, Institute of Bacteriology and Mycology, Leipzig University, Leipzig, Germany
| | - Marcel Suchowski
- Faculty of Veterinary Medicine, Institute of Pathology, Leipzig University, Leipzig, Germany
| | - Johannes Kacza
- Bioimaging Core Facility, Saxon Incubator for Clinical Translation (SIKT), Leipzig University, Leipzig, Germany
| | - Wieland Schrödl
- Faculty of Veterinary Medicine, Institute of Bacteriology and Mycology, Leipzig University, Leipzig, Germany
| | - Jule K Michler
- Faculty of Veterinary Medicine, Institute of Anatomy, Histology and Embryology, Leipzig University, Leipzig, Germany
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Baumbach CM, Michler JK, Nenoff P, Uhrlaß S, Schrödl W. Visualising virulence factors: Trichophyton benhamiaes subtilisins demonstrated in a guinea pig skin ex vivo model. Mycoses 2020; 63:970-978. [PMID: 32620041 DOI: 10.1111/myc.13136] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Revised: 06/22/2020] [Accepted: 06/26/2020] [Indexed: 01/27/2023]
Abstract
BACKGROUND Dermatophytoses rank among the most frequent communicable diseases in humans, and the zoonotic transmission is increasing. The zoophilic dermatophyte Trichophyton (T.) benhamiae is nowadays one of the main causes of tinea faciei et corporis in children. However, scientific data on molecular pathomechanisms and specific virulence factors enabling this ubiquitous occurrence are scarce. OBJECTIVES To study tissue invasion and the expression of important virulence factors of T. benhamiae, isolates that were recovered from two groups of hosts (humans vs. guinea pigs (GP)) using an ex vivo skin model. METHODS After confirmation of species identity by ITS sequencing, CFU suspensions of dermatophyte isolates (n = 20) were applied to the skin infection model and cultured. Employing specific immunofluorescence staining techniques, the expression of subtilisin 3 and 6 and metallocarboxypeptidase A was analysed. The general mode of invasion was explored. Results were compared with biopsies of naturally infected GP. RESULTS All isolates were successfully recovered and proliferated well after application to the infection model. Progressive invasion of hyphae through all skin structures and destruction of explants were observed with early events being comparable to natural infection. An increasing expression of the examined virulence factors towards the end of culture was noticed but no difference between the two groups of isolates. CONCLUSIONS For the first time, important in vivo markers of dermatophytosis were visualised immunohistochemically in an ex vivo skin infection model and in skin biopsies of GP naturally infected with T. benhamiae. More research on the underlying pathomechanisms of dermatophyte infection is urgently needed.
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Affiliation(s)
- Christina-Marie Baumbach
- Institute of Bacteriology and Mycology, Centre of Infectious Diseases, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Jule Kristin Michler
- Institute of Veterinary Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Pietro Nenoff
- Laboratory for Medical Microbiology, Mölbis, Germany
| | - Silke Uhrlaß
- Laboratory for Medical Microbiology, Mölbis, Germany
| | - Wieland Schrödl
- Institute of Bacteriology and Mycology, Centre of Infectious Diseases, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
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