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Генетическая характеристика вирулентного потенциала энтерококков, выделенных из разных биотопов тела человека, и модификация факторов персистенции Candida albicans под их влиянием

Генетическая характеристика вирулентного потенциала энтерококков, выделенных из разных биотопов тела человека, и модификация факторов персистенции Candida albicans под их влиянием

Abstract

Objective. The objective was to study the effect of Enterococci, which were isolated from human microbiotas at different body sites in pathological conditions and were featured with genetic virulence determinants, on the persistent properties of Candida albicans. Materials and Methods. In carrying out the research, 64 strains of C. albicans and 17 strains of Enterococcus genus were isolated from human gastrointestinal (GI) tract examined for dysbiosis and from reproductive tracts of women experiencing pathological conditions. Identification of Candida albicans was carried out using standard methods; and bacteria of Enterococcus genus were detected by multiplex-PCR analysis. Anti-lysozyme activity of C. albicans was assessed using the method by O.V. Bukharin et al (1999), and biofilm formation was assayed following the method by G.A. O’Toole et al. (2000). Genes encoding the synthesis of virulence factors of Enterococcus bacteria (gelE, cylM, cylB, cylA, esp, hyl, asa) were revealed using PCR detection. Bacterial-fungal interactions between C. albicans and Enterococcus spp. were studied during co-isolation in common broth. Statistically, the results were treated using t-Student's test. Results. Virulence determinants have been detected in Enterococcus faecalis only. Characteristic features have been established for the intermicrobial interactions of virulent and avirulent isolates of Enterococcus spp. with C. albicans : it has been established that the persistent characteristics of Candida spp. exhibit prevalent inhibition under the effect of E. faecium and show an increase when co-isolated with E. faecalis. Conclusion. The data obtained on the inhibition of C. albicans persistence factors by avirulent strains of E. faecium open up a prospect of further studying the strain as a basis for antimycotic bio-based agents.

Цель. Изучение особенностей влияния энтерококков, выделенных из разных биотопов тела человека при патологии и отличающихся по наличию генетических детерминант вирулентности, на персистентные свойства Candida albicans. Материалы и методы. В исследовании использовали 64 штамма C. albicans и 17 штаммов энтерококков, выделенных из кишечника людей при обследовании на дисбиоз, и репродуктивного тракта женщин при гинекологической патологии. Идентификацию грибов рода Candida осуществляли общепринятыми методами, бактерий рода Enterococcus с помощью мультиплексной ПЦР. Антилизоцимную активность C. albicans определяли по О.В. Бухарину с соавт. (1999), образование биопленок по G.A. O’Toole et al. (2000). Гены, кодирующие синтез факторов вирулентности бактерий рода Enterococcus (gelE, cylM, cylB, cylA, esp, hyl, asa), выявляли с помощью ПЦР. Взаимодействие C. albicans и бактериями рода Enterococcus исследовали при совместном культивировании в бульоне. Статистическую обработку результатов проводили с использованием t-критерия Стьюдента. Результаты. Генетические детерминанты вирулентности выявлены только у представителей вида Enterococcus faecalis. Установлены особенности межмикробного взаимодействия вирулентных и авирулентных штаммов Enterococcus spp. с грибами C. albicans : выявлено преимущественное подавление персистентных характеристик Candida spp. под воздействием E. faecium и повышение при сокультивировании с E. faecalis. Заключение. Полученные данные о подавлении факторов персистенции C. albicans авирулентными штаммами E. faecium открывают перспективу для их дальнейшего изучения в качестве основы антимикотического биопрепарата.

Keywords

C. ALBICANS,E. FAECALIS,E. FAECIUM,ФАКТОРЫ ПЕРСИСТЕНЦИИ,ПЦР,ГЕНЫ ВИРУЛЕНТНОСТИ,МЕЖМИКРОБНЫЕ ВЗАИМОДЕЙСТВИЯ,PERSISTENCE FACTORS,PCR,VIRULENCE GENES,INTERMICROBIAL INTERACTIONS

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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