RESUMEN
Introdução: A infecção da corrente sanguínea (ICS) por leveduras, tem como principal gênero a Candida. As principais espécies que causam a candidemia no Brasil são Candida albicans, Candida parapsilosis e Candida tropicalis, sendo a C. albicans a mais prevalente. Todavia, nas últimas décadas tem aumentado a prevalência de espécies de Candidanão albicans (CNA) e principalmente a emergência de Candida auris, que possuem mecanismos de resistência aos antifúngicos mais usados, caracterizando um cenário de preocupação mundial. Objetivo: Avaliar a prevalência de candidemia e das principais espécies de Candida spp. isoladas de amostras de hemocultura e sua distribuição por setores de internação de um hospital de ensino. Material e Métodos: Trata-se de um estudo observacional e retrospectivo, em que foram analisadas, através de bancos de dados, hemoculturas positivas para Candida spp. de pacientes internados em um hospital de ensino da cidade de Juiz de Fora, Minas Gerais, no período de janeiro de 2021 a dezembro de 2022. Resultados: Foram analisadas 3.262 hemoculturas, sendo 1.059 (32,46%) positivas. Destas, 1.008 (95,18%) tiveram crescimento bacteriano e 51 (4,82%) tiveram crescimento de Candida spp. divididos em, 20 (39,22%) C. albicans e 31 (60,78%) CNA. Das CNA isolados, 14 foram C. tropicalis (45,16%), 10 C. parapsilosis(32,26%), 3 C. glabrata (9,68%), 2 Candida kefyr (6,45%) e 2 Candida lusitaniae (6,45%). Dos 51 isolados de Candida spp., 25 (49,02%) foram no centro de tratamento intensivo, 11 (21,57%) no bloco cirúrgico e 15 (29,41%) foram nas enfermarias. Conclusão: Candida albicans é a principal espécie relacionada a candidemia em pacientes hospitalizados, porém espécies do grupo CNA têm apresentado elevada prevalência em isolados de hemocultura, principalmente em pacientes de centro de tratamento intensivo.
Introduction: Bloodstream infection (BSI) by yeasts has Candida as its main genus. The main species that cause candidemia in Brazil are Candida albicans, Candida parapsilosis and Candida tropicalis, and C. albicans referred as the most prevalent. However, in recent decades, the prevalence of non-albicans Candida species (NAC) has increased and especially the emergence of Candida auris, which have mechanisms of resistance to the most used antifungals, characterizing a scenario of global concern. Objective: To evaluate the prevalence of candidemia and the main species of Candida spp. isolated from blood culture samples and their distribution by hospitalization sectors of a teaching hospital. Material and Methods: This is an observational and retrospective study, of positive blood cultures for Candida spp. of patients admitted to a teaching hospital in the city of Juiz de Fora, Minas Gerais, from January 2021 to December 2022. Results: Among 3262 blood cultures analyzed, 1059 (32.46%) of which were positive. Of these, 1008 (95.18%) had bacterial growth and 51 (4.82%) had Candida spp. divided into, 20 (39.22%) C. albicans and 31 (60.78%) NAC. Of the NAC isolated, 14 were C. tropicalis (45.16%), 10 C. parapsilosis (32.26%), 3 C. glabrata (9.68%), 2 Candida kefyr (6.45%) and 2 Candida lusitaniae (6.45%). Of the 51 Candida spp. isolates, 25 (49.02%) were in the intensive care unit, 11 (21.57%) in the operating room and 15 (29.41%) were in the wards. Conclusion: Candida albicans is the main species related to candidemia in hospitalized patients, but species from the NAC group have shown high prevalence in blood culture isolates, especially in the intensive care unit patients.
RESUMEN
Nucleoside triphosphate diphosphohydrolase (NTPDase) 1 from intracellular amastigotes of Leishmania infantum-infected macrophage was identified by immunocytochemistry and confocal laser scanning microscopy using antibodies that specifically recognize its B-domain. This enzyme was previously characterized in Leishmania promastigote form, and here it is shown to be susceptible to pentamidine isethionate (PEN). In initial assays, this antileishmanial compound (100⯵M) reduced 60% phosphohydrolytic activity of promastigotes preparation. An active NTPDase 1 was then isolated by non-denaturing gel electrophoresis, and PEN (10⯵M) inhibited 74% and 35% of the ATPase and ADPase activities, respectively, of this pure protein. In addition, PEN 0.1-1⯵M inhibited 56% potato apyrase activity, a plant protein that shares high identity with Leishmania NTPDase 1. In contrast, amphotericin B, fluconazole, ketoconazole or allopurinol did not significantly affect phosphohydrolytic activity of either promastigotes preparation or potato apyrase. This work suggests amastigote NTPDase 1 as a new molecular target, and inhibition of its catalytic activity by pentamidine can be part of the mode of action of this drug contributing with the knowledge of its antileishmanial effect.