مجله دانشکده پزشکی اصفهان
پیاپی 668 (هفته چهارم خرداد 1401)

Candidemia showed high morbidity and mortality and should be diagnosed immediately. The aim of this study was to provide a simple and rapid method for direct detection of Candida in the blood, using conjugated antibodies with gold nanoparticles by the agglutination method.

In this study, yeast species isolated from 40 blood samples of patients tested by the BACTEC method were used.  After identifying the etiologic agents by morphological and molecular methods, a mixture of yeast antigens was prepared. Briefly, a mixture of antigens was prepared from the Candida isolates detected from candidemia, and injected into healthy rabbit skin with complete adjuvant to produce antibodies. After injecting the incomplete adjuvant in four reminders, blood samples and serum were finally prepared from the rabbit. Antibody production and its efficacy were confirmed by ELISA method. Gold nanoparticles were chemically conjugated with antibodies. For rapid diagnosis of candidemia, the nanoparticle method was examined on the blood of four patients and blood contaminated with a certain number of Candida yeasts in the laboratory.

Candida albicans was the most common etiologic agent of candidemia, followed by Candida glabrata and Candida parapsilosis complex. In determining the cut-off nanoparticle method, the least yeast detectable in the patient's blood was one yeast. The sensitivity and specificity of the nanoparticle method for detecting Candida in the blood of four patients compared to blood culture was 100%.

Under our laboratory conditions, if testing 15 µl blood of a suspected patient to candidemia containing one yeast or even just Candida antigens exposed to 35 microliters of the nanoparticles conjugated antibodies, it shows agglutination during one minute.

Mesenchymal stem cells and their secretions contain various factors that have anti-inflammatory properties. The aim of this study was to evaluate the effect of environment derived from stem cell from apical papilla (SCAP) on H2O2-induced retinal toxicity in rats.

Twenty healthy rats were selected for this study, all of which underwent intravitreal H2O2 injection in days 1 and 2 of the right eye. They were then randomly divided into two groups: no other intervention was performed in the first group, but in the second group, on the fifth day, the conditioned medium adjacent to the stem cell of apex of the dental papilla were injected into the vitreous of the right eye. The left eye was considered as the control. After two weeks, all rats were euthanized and histological evaluation was performed.

Retinal thickness in the second group (236.8 ± 20.8 microns) was closer to the control group compared to the first group (199.9 ± 65.3 microns) which was statistically significant.

This study showed that the Conditioned medium adjacent to SCAP contains secretory factors that can have a protective effect on damaged retinal cells and reduce the rate of retinal atrophy.

The exact mechanisms involved in acute renal injury (AKI) due to renal ischemia-reperfusion (IR) are not fully understood, although it has been shown that the renin-angiotensin system (RAS) may play an important role in IR-associated AKI. RAS is considered as one of the most important vasoactive systems of endocrine, paracrine and intracrine, which is important in the physiological regulation of cardiovascular function, blood pressure, fluid and electrolytes balance. This system exerts a set of beneficial or adverse vascular and renal effects. The two main arms of RAS include "ACE, angiotensin II, AT1 receptor" (vasoconstrictor arm) and "ACE2, angiotensin 1-7, AT2 receptor and Mas receptor" (vasodilator arm). IR and its outputs have been reported to be sex-dependent. On the other hand, systemic and local RAS function in the regulation of renal hemodynamics can also be affected by gender. In fact, sex and sex hormones affect sensitivity to angiotensin II and angiotensin 1-7. This review article examines the role of RAS receptors of the new vasopressor arm versus the classic vasopressor arm and their function interference, as well as sex differences and it's influence on renal blood flow in renal IR Injury.