Reconstructed interfollicular feline epidermis as a model for the screening of antifungal drugs against Microsporum canis

2008 ◽  
Vol 19 (3) ◽  
pp. 130-133 ◽  
Author(s):  
Jeremy Tabart ◽  
Aline Baldo ◽  
Sandy Vermout ◽  
Bertrand Losson ◽  
Bernard Mignon
2021 ◽  
Author(s):  
Sebastian Gnat ◽  
Dominik Łagowski ◽  
Mariusz Dyląg ◽  
Aneta Nowakiewicz

AbstractThe European hedgehog (Erinaceus europaeus Linnaeus) frequently colonises areas located close to human life in cities, as these are more suitable nest sites offering an abundance of food and allowing avoidance of predators. However, urbanisation has a significant impact on the epidemiology of infectious diseases, including dermatophytoses, the primary source of which are wild animals. In this study, we determined the spectrum of dermatophytes isolated from the European hedgehog and assessed their susceptibility profile to antifungal drugs. Symptomatic and asymptomatic dermatophyte infections were observed in 7.7% and 8% of the 182 examined free-living hedgehogs, respectively. In the pool of the isolated dermatophyte strains, Trichophyton erinacei was dominant (29.9%), followed by Trichophyton mentagrophytes (17.9%), Trichophyton benhamiae (13.4%), Nannizzia gypsea (11.9%), Microsporum canis (10.4%), Nannizzia nana (7.5%), Paraphyton cookei (6.0%), and Nannizzia fulva (3.0%). Susceptibility tests revealed the highest activity of luliconazole and the lowest of activity fluconazole among the azole drugs applied. Although terbinafine generally exhibited high efficacy, two Trichophyton mentagrophytes isolates showed resistance to this drug (MIC = 2 µg/ml) resulting from missense mutations in the SQLE gene corresponding to the amino acid substitution Leu393Phe. Summarising, our study has also revealed that such wildlife animals as hedgehogs can be a reservoir of pathogenic human dermatophytes, including harmful strains resistant to commonly used antifungal drugs. Graphical Abstract


2021 ◽  
Vol 23 (104) ◽  
pp. 47-54
Author(s):  
Y. V. Martyniv ◽  
Ya. V. Kisera

Microsporia is the most common disease of fungal etiology, most often caused by the pathogen Microsporum canis. Treatment of this disease requires a comprehensive approach, because the disease is dangerous to humans. Therefore, in the treatment of microspores, it is important not only to carry out therapeutic measures, but also to prevent the spread of the pathogen of the fungus in the environment and increase the immune status of the organism in the fight against infection. The main source of infection is cats. In order to determine the effectiveness of treatment of microsporia by various methods, studied of the blood and skin of guinea pigs infected with the pathogen M. canis. Sick animals were divided into three groups. The first group was treated with the systemic antifungal itraconazole and topical treatment with a solution of clotrimazole. Treatment of the second group was performed with a topical antifungal agent (1% solution of clotrimazole) with vaccination with the antifungal vaccine “Vakderm”. For the third group, the developed drugs were used – antifungal agent “Micromar” and immunostimulant “Biogluk”. During treatment, hematological and immunological blood researches and histological skin examinations were performed. During treatment with antifungal drugs (itraconazole and clotrimazole) the number of leukocytes decreases from 11.13 ± 0.72 to 7.13 ± 0.22, rod-shaped neutrophils from 15.76 ± 1.29 to 5.50 ± 0.76, and segmental increases from 12.17 ± 1.47 to 24.17 ± 2.27, decreases ESR from 5.67 ± 0.67 to 2.33 ± 0.42, which occurs when inhibiting the inflammatory response of the organism to infection. Thrombocytopenia (from 231.17 ± 7.60 to 184.33 ± 7.65) and eosinophilia (from 2.70 ± 0.73 to 7.33 ± 1.33) are also noted. There is a slight increase in T-helpers and a decrease in T-suppressors. Histologically, the infiltration of the dermis by histiocytes and  eosinophils under skin  persists. In the treatment of microsporia by treatment with 1 % solution of clotrimazole and vaccination with the vaccine “Vakderm” the results of studies showed that the number of leukocytes decreases from 11.13 ± 0.72 to 5.35 ± 0.31 (P < 0.01), rod-shaped neutrophils from 15.76 ± 1.29 to 7.67 ± 0.56, and segmental increases from 12.17 ± 1.47 to 22.17 ± 0.91 (P < 0.001), decreases). The number of T-helpers is increasing. The histological picture on day 7 is characterized by hyperkeratosis, and on day 14 the hyperemia of the basal layer of the epidermis persists. When using the antifungal drug “Micromar” and immunostimulant “Biogluk” the results of studies showed that the number of leukocytes decreases from 11.13 ± 0.72 to 6.95 ± 0.10, rod-shaped neutrophils from 15.76 ± 1.29 to 6.17 ± 0.65, and segmental increases from 12.17 ± 1.47 to 22.00 ± 0.86, decreases ESR from 5.67 ± 0.67 to 2.17 ± 0.31. Increases the number of T-helpers and the number of natural killers and T-suppressors is gradually decreasing. Histological changes are presented in the form of dilation of blood vessels and visualization of single erythrocytes in the dermis on day 14 of treatment.


2021 ◽  
Vol 22 (22) ◽  
pp. 12180
Author(s):  
Marta Malinowska ◽  
Diana Sawicka ◽  
Katarzyna Niemirowicz-Laskowska ◽  
Przemysław Wielgat ◽  
Halina Car ◽  
...  

It is established that high rates of morbidity and mortality caused by fungal infections are related to the current limited number of antifungal drugs and the toxicity of these agents. Imidazolium salts as azole derivatives can be successfully used in the treatment of fungal infections in humans. Steroid-functionalized imidazolium salts were synthesized using a new, more efficient method. As a result, 20 salts were obtained with high yields, 12 of which were synthesized and characterized for the first time. They were derivatives of lithocholic acid and 3-oxo-23,24-dinorchol-4-ene-22-al and were fully characterized by 1H and 13C nuclear magnetic resonance (NMR), infrared spectroscopy (IR), and high resolution mass spectrometry (HRMS). Due to the excellent activity against bacteria and Candida albicans, new research was extended to include tests on five species of pathogenic fungi and molds: Aspergillus niger ATCC 16888, Aspergillus fumigatus ATCC 204305, Trichophyton mentagrophytes ATCC 9533, Cryptococcus neoformans ATCC 14116, and Microsporum canis ATCC 11621. The results showed that the new salts are almost universal antifungal agents and have a broad spectrum of activity against other human pathogens. To initially assess the safety of the synthesized salts, hemocompatibility with host cells and cytotoxicity were also examined. No toxicity was observed at the concentration at which the compounds were active against pathogens.


Mycoses ◽  
2019 ◽  
Vol 62 (11) ◽  
pp. 1069-1078 ◽  
Author(s):  
Mahdi Abastabar ◽  
Ali Jedi ◽  
Jacques Guillot ◽  
Macit Ilkit ◽  
Samaneh Eidi ◽  
...  

Author(s):  
Antônio Carlos Nogueira SOBRINHO ◽  
Raquel Oliveira dos Santos FONTENELLE ◽  
Elnatan Bezerra de SOUZA ◽  
Selene Maia de MORAIS

ABSTRACT Dermatophytes are hyaline fungi that parasitize the keratinized tissue of humans and animals causing mycotic infections. Natural products are promising molecules for the development of new antifungal drugs, due to the phenomenon of resistance and toxicity. This study reports the isolation and identification of lachnophyllum ester and evaluates its antioxidant, antifungal and modulatory activities against dermatophytes fungi. Lachnophyllum ester was obtained using a silica gel column chromatography of the essential oil from the aerial parts of Baccharis trinervis and analyzed by gas chromatography/mass spectrometry. Antimicrobial activity was determined by the broth microdilution method. The modulatory activity assays were performed by the checkerboard technique using lachnophyllum ester and ketoconazole as standard. The lachnophyllum ester exhibited good antioxidant activity as measured by a β-carotene/linoleic acid bleaching system, with 71.43% ± 0.01% inhibition rate. In addition, it showed antifungal activity against Trichophyton rubrum and Microsporum canis strains. In the modulatory assay, interaction between lachnophyllum ester and ketoconazole was synergistic, reducing the minimum inhibitory concentration (MIC) values of the antifungal drug and modulating its antifungal action against dermatophyte strains. In conclusion, lachnophyllum ester has been shown to act as a natural antioxidant compound, as well as an antimicrobial alternative against dermatophyte fungi of the genus Trichophyton and Microsporum.


2021 ◽  
Vol 4 (2) ◽  
Author(s):  
May Iyasya Sarumpaet ◽  
Dian Dwi Wahyuni

Dermatophytosis is a superficial skin infection caused by dermatophytes that infected keratinous skin tissue, dermatophytes form molecules that bind to keratin as a source of nutrients in the formation of colonization. Dermatophytes that cause dermatophytosis are Tricophyton sp, Epidermophyton sp and Microsporum sp. To find out the Profile of dermatophytes in patients with dermatophytosis in the Polyclinic of Dermatology and Venerology Dr. Ferdinand Lumbantobing Sibolga in 2019 conducted observational research with cross sectional design. The sample of this study were 75 patients who were new patients and had not used antifungal drugs. This sample is then examined by examination of KOH and cultured and then identified by Scotch-tape Preparation in a microscope. The prevalence of dermatophytosis in this study was 23% of skin cases. The majority of dermatophytosis patients are women (52%), the most age group is 46-65 years (30.7%) and is most often found in housewives (24%). The dermatophytes species found were Trichophyton rubrum, Trichophyton mentagrophytes and Microsporum canis with the most species Trichophyton rubrum (37.3%), which was then followed by Trichophyton mentagrophytes (16%). Tinea corporis, tinea cruris, tinea capitis, tinea pedis and tinea unguinum are dermatophytosis cases that were found in this study. It can be concluded that Trichophyton rubrum is the most common cause of dermatophytosis in Dr. Ferdinand Lumbantobing Sibolga with Tinea corporis is the most classified classification of dermatophytosis.


2018 ◽  
Vol 19 (1) ◽  
pp. 105-115 ◽  
Author(s):  
Fransérgio Américo Ribeiro Alves ◽  
Selene Maia de Morais ◽  
Antonio Carlos Nogueira Sobrinho ◽  
Isaac Neto Goes da Silva ◽  
Clécio Galvão Martins ◽  
...  

SUMMARY Resistance to use antifungal drugs is a great concern seeking for scientists to discover new products to treat fungal infections. The aim of this study was to evaluate the antioxidant and antifungal activities of essential oils and extracts of Plectranthus grandis and Plectranthus ornatus against Trichophyton rubrum and Microsporum canis dermatophytes strains. Extracts were obtained from leaves by maceration in ethanol (96%) during 7 days. The oils were obtained by hydrodistillation and analyzed by gas chromatography/mass spectrometry. A total of 25 components were identified, as major constituents the sesquiterpenes β-caryophyllene, α-copaene, germacrene, β-caryophyllene and caryophyllene oxide. Antioxidant activities were evaluated using DPPH scavenging assay and antifungal action was determined by the broth microdilution method. The decocts obtained from the extraction of essential oil presented a greater antioxidant action when compared with the essential oils, with IC50 values of 12.35 μg/mL and 15.69 μg/mL to P. ornatus and P. grandis, respectively. Natural products presented significant antifungal activity, with MIC values ranging from 0.078 mg/mL to 0.31 mg/mL for all strains. The synergistic activity between Plectranthus spp. extracts and ketoconazole demonstrated a fungal growth inhibitory action when combined with a standard antifungal drug, indicating its potential for use in preventive veterinary medicine to treat dermatophytoses.


2021 ◽  
Vol 8 ◽  
Author(s):  
Ya Bin Zhou ◽  
Yuan Yuan Xiao ◽  
Jin Jing Chao ◽  
Lin Ma

The checkerboard broth method based on the Clinical and Laboratory Standards Institute M38-A3 document was used in this study to evaluate the in vitro activity of allicin alone and in combination with the antifungal drugs (griseofulvin, fluconazole, itraconazole and terbinafine) against Microsporum canis isolated from patients with tinea capitis. When allicin was used alone, only weak anti-M. canis effects were found. The MIC50, MIC90 and geometric mean (GM) of terbinafine were the lowest among the compounds tested. Synergism was observed for the combinations of allicin with itraconazole and terbinafine. Only indifference was observed for the combinations of allicin with griseofulvin and fluconazole. Our study illustrated the synergism of allicin in combination with itraconazole and terbinafine, which could be a reference for the treatment of tinea capitis due to M. canis.


1999 ◽  
Vol 37 (2) ◽  
pp. 123-129 ◽  
Author(s):  
B. R. Mignon ◽  
T. Leclipteux ◽  
CH. Focant ◽  
A. J. Nikkels ◽  
G. E. PIErard ◽  
...  

1998 ◽  
Vol 36 (5) ◽  
pp. 255-262
Author(s):  
SIMPANYA ◽  
JARVIS ◽  
BAXTER

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