Efecto inhibitorio del dietilestilbestrol sobre aislamientos clínicos de Candida albicans sensibles y resistentes a los azoles
Revista Iberoamericana de Micología, ISSN: 1130-1406, Vol: 36, Issue: 3, Page: 115-119
2019
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Article Description
Candida albicans es uno de los microorganismos más frecuentemente involucrados en diversas infecciones; la cavidad bucal del paciente, los nichos de caries o la enfermedad periodontal pueden actuar en ocasiones como reservorio. El desarrollo de resistencia a los medicamentos disponibles y otros factores justifican la búsqueda de nuevos antimicóticos. Estudiar de forma comparativa los efectos in vitro del medicamento antitumoral dietilestilbestrol (DES) y del fluconazol (FLZ) sobre el crecimiento de cepas clínicas de C. albicans aisladas de pacientes con enfermedades odontológicas y médicas. Se emplearon siete cepas de C. albicans : a) la cepa de colección ATCC 90028, sensible a FLZ (ATCC); b) cuatro aislamientos bucales de sendas pacientes oncológicas con enfermedad periodontal (period 8, 9, 10 y 11); y c) dos aislamientos bucales de un paciente con sida y candidiasis orofaríngea: un aislamiento era sensible a FLZ (2-76) y el otro resistente (12-99). Se evaluó el crecimiento celular por técnicas espectrofotométricas estandarizadas (M27-A3, CLSI) y se calculó la concentración inhibitoria 50% (CI 50 ) por análisis de funciones mediante el programa Graph Pad. El DES inhibió el crecimiento de C. albicans, tanto sensible como resistente al FLZ. Los datos se ajustan adecuadamente a curvas teóricas saturables de tipo concentración del inhibidor versus respuesta. Las concentraciones inhibitorias mínimas fueron con DES y FLZ, respectivamente, las siguientes: 28,18 µg/ml y 4,90 µg/ml (ATCC); 17,16 µg/ml y 3,14 µg/ml (period); 27,64 µg/ml y 4,22 µg/ml (2-76); 6,16 µg/ml y 438,19 µg/ml (12-99). El DES tiene actividad antimicótica sobre aislamientos de C. albicans de pacientes con enfermedades odontológicas y médicas. La mayor potencia antimicótica observada fue sobre el aislamiento resistente al FLZ. Candida albicans is a microorganism frequently involved in several infections; the patient's oral cavity, caries niches or periodontal disease can sometimes be the reservoir.. The fungal resistance to the available treatments, among other reasons, has led to the search for new antifungal alternatives. To carry out a comparative study of the in vitro effects of diethylstilboestrol (DES) and fluconazole (FLZ) on the growth of clinical strains of C. albicans. Seven strains of C. albicans were used: a) one FLZ-sensitive culture collection strain, ATCC 90028 (ATCC); b) four oral isolates from four oncological patients with periodontal disease (period 8, 9, 10, and 11); and c) two oral isolates from an AIDS patient with oropharyngeal candidiasis: one FLZ- sensitive (2-76), and another FLZ- resistant (12-99). The MIC was evaluated by standard spectrophotometric techniques using the CLSI (M27-A3) guidelines. The inhibitory concentration 50% (IC 50 ) was calculated using functional analysis with the Graph Pad software. DES inhibited the growth of all C. albicans strains, whether sensitive or resistant to FLZ. Experimental data fitted non-linear functions of inhibitor concentration versus response. Minimum inhibitory concentrations (MIC) for DES and FLZ were as follows: 28.18 µg/ml and 4.90 µg/ml (ATCC); 17.16 µg/ml and 3.14 µg/ml (period); 27.64 µg/ml and 4.22 µg/ml (2-76); 6.16 µg/ml and 438.19 µg/ml (12-99), respectively. DES showed antifungal activity on all clinical C. albicans strains isolated from patients with dental and medical diseases. It showed the highest potency on the FLZ-resistant isolate.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1130140619300312; http://dx.doi.org/10.1016/j.riam.2019.03.001; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85068433233&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/31300300; https://linkinghub.elsevier.com/retrieve/pii/S1130140619300312; https://dx.doi.org/10.1016/j.riam.2019.03.001
Elsevier BV
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