Bulletin of RSMU

ISSN Print 2500–1094 ISSN Online 2542–1204

Bulletin of RSMU

BIOMEDICAL JOURNAL OF PIROGOV UNIVERSITY (MOSCOW, RUSSIA)

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Goloshchapov DL, Kashkarov VM, Ippolitov YuA, Ippolitov IYu, Vongsvivut Jitraporn, Seredin PV

The low affinity of composite materials for the hard tissue of human teeth poses a challenge to restorative dentists. This study was undertaken to explore molecular and chemical characteristics of the interface between the dental cement, the buffer layer formed from a next generation biomimetic material that mimics the organic mineral composition of human enamel and dentin, and the intact native hard dental tissue. Seven plane-parallel dental slices were analyzed using synchrotron IR microspectroscopy. The obtained absorption spectra of functional molecular groups were organized into cluster maps. This allowed us to identify the intact tissue, the adhesive agent and the biomimetic layer at their interface and to localize and measure concentrations of functional groups involved in the integration of the biomimetic composite into the hard tissue of the human tooth. The proposed biomimetic material is based on nanocrystal carbonate-substituted calcium hydroxyapatite synthesized from a biogenic calcium source and a complex of basic polar amino acids copying the composition of the human tooth and can form a functional bond with hard dental tissue.

Received: 2019-07-18

Published online: 2019-08-01

DOI: 10.24075/brsmu.2019.047

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VIEWS 4506

Milushkina OYu, Skoblina NA, Markelova SV, Tatarinchik AA, Melikhova EP, Libina II, Popov MV

The impact of excessive exposure to electronic devices (ED) on youth health remains understudied. There is a pressing need to develop recommendations for the safe use of stationary and mobile ED aimed at minimizing health risks. In this work, we assess the effect of ED on the physical growth and development of high-school and university students and provide recommendations for preventing the negative impact of prolonged screen time on health. The study recruited 460 high-school and 598 university students. Standard anthropometric measurements were taken. The psychological and emotional state of the participants was evaluated using the Test Anxiety Inventory by Spielberg (modified by Khanin). To estimate daily and weekly exposure to ED the participants were asked to fill out standardized questionnaires. In high school students, the average screen time was 7 h a day; in university students, 8.5 to 10 h a day. Only 60% of the participants, regardless of their place of residence or the type of educational institution they were attending, were physically healthy. We conclude that prolonged and frequent exposure to ED is one of the factors that can interfere with normal physical growth and development in youth. Regular daily use of stationary ED increases the risk of developing body weight deficit by 24% and gaining excess body weight by 10%. We recommend that students should eliminate computers, laptops and stationary ED from their daily activities for at least one day at the weekend and reduce total screen time to 3 hours a day.

Received: 2019-07-04

Published online: 2019-07-23

DOI: 10.24075/brsmu.2019.046

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VIEWS 4579

Muzaffarova TA, Novikova OV, Sachkov IYu, Kipkeeva FM, Ginter EK, Karpukhin AV

Desmoid-type fibromatosis (DF) is a rare mesenchymal tumor occurring in only 2 to 4 people per 1,000,000 population a year. Desmoid tumors are either seen sporadically or in individuals with familial adenomatous polyposis (FAP). The etiology of sporadic DF is uncertain. The aim of this study was to estimate the potential significance of germline mutations in the АРС gene in patients with sporadic DF. АРС exons were amplified, studied using conformation sensitive gel electrophoresis and then Sanger-sequenced. The obtained data were processed in Statistica 10. Mutations were detected in 6 (12%) of 51 participants with sporadic DF. Those 6 patients shared a typical DF phenotype characterized by early age of onset (5.8 years on average, in contrast to the patients without APC mutations, who developed DF at 19 years of age; р = 0.02), severe clinical course, multifocal localization on the trunk, and poor prognosis. All of the detected APC mutations were localized to the 3'-end of the gene. For the purpose of comparison, we analyzed a sample of 12 patients with FAP-associated DF. Of those patients, 6 carried mutations in the APC gene. In the analyzed sample, the patients with FAP and the mutant APC gene developed DF at older age (35 years) than the patients with sporadic DF (p = 0.004) and their tumors were not multifocal. This means that sporadic and FAP-associated desmoids have different phenotypes in patients with APC mutations. Patients with sporadic tumors have mutations at the 3'-end of the АРС gene more often than individuals with FAP-associated DF. To our knowledge, this is the first study to characterize the subtype of sporadic desmoid fibromatosis phenotypically determined by germline mutations in the APC gene.

Received: 2019-06-25

Published online: 2019-07-18

DOI: 10.24075/brsmu.2019.045

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VIEWS 4488

Tynio YaYa, Morozova GV, Biryukova YuK, Trubnikova EV, Zylkova MV, Sivokhin DA, Ivanov KP, Pozdniakova NV, Kazakova EA, Mutnykh ES, Shevelev AB

Noninvasive stable isotope breath tests allow highly accurate and safe estimation of liver and biliary tract function. The aim of this study was to test 13С-labeled linoleic and linolenic acids intended for diagnostic use for acute and subchronic toxicity. The acids were synthesized using the patented method. A single intragastric administration of the tested compounds to experimental BALB/c mice and Wistar rats in the amounts exceeding clinical doses 500 to 2500-fold did not cause animal death. In the subchronic toxicity test, the rats received 5 to 25 times higher doses than recommended for clinical use in humans. In a 14-day follow-up period, no significant differences were observed between the main and the control groups in terms of weight, blood count (red blood cells, white blood cells, platelets), and blood biochemistry (hemoglobin, total protein, alkaline phosphatase, alanine aminotransferase, aspartate aminotransferase, lactate dehydrogenase, bilirubin). The studied compounds are safe at doses intended for oral administration and are recommended for further preclinical and clinical trials.

Received: 2019-06-24

Published online: 2019-06-30

DOI: 10.24075/brsmu.2019.044

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VIEWS 4732

Balanovsky OP, Kagazezheva ZhA, Olkova MV

DNA quantification is a routine yet important procedure that determines the efficacy of long-term sample storage and further manipulations with the sample. There are a few well-established methods for measuring DNA concentrations. However, it still not fully clear how concordant their results are. The aim of this work was to measure DNA concentrations in a set of samples using different quantification methods and to compare the obtained values. In 2 independent experiments, a total of 100 genomic DNA samples were analyzed using 3 different DNA quantification methods, including spectrophotometry (NanoDrop), fluorometry (Qubit) and real-time PCR (Quantifiler). The obtained relative concentrations demonstrated an excellent correlation (the correlation coefficients were as high as 0.98 to 0.99). However, the absolute concentrations showed a considerable variation and even a twofold difference. Spectrophotometry yielded the highest concentrations, whereas fluorometry yielded the lowest. The real-time PCR results were intermediate. The differences were more pronounced for the samples with low DNA concentrations. We recommend that such differences should be accounted for when estimating DNA concentrations using an arsenal of different quantification methods.

Received: 2019-06-21

Published online: 2019-06-30

DOI: 10.24075/brsmu.2019.043

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VIEWS 4765

Takhchidi KhP, Kachalina GF, Takhchidi NKh, Manoyan RA, Gliznitsa PV

The death of outer retinal layers occurring in retinitis pigmentosa causes severe visual impairment and often leads to total blindness. Inner retinal layers are spared, though, which provides a possibility of inducing visual perception by direct electrical stimulation of intact retinal cells. This article presents clinical outcomes of two patients who were the first in Russia to have received the Argus II Retinal Prosthesis System. Both implantations were successful. No complications were reported throughout the entire follow-up period. Upon completing 3 rehabilitation sessions, the patients were able to navigate indoors and outdoors, locate small high-contrast objects, discern contours of large objects and people’s silhouettes.

Received: 2019-06-04

Published online: 2019-06-26

DOI: 10.24075/brsmu.2019.042

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VIEWS 4875

Valyakh MA, Kats DV, Glazko NG, Baranov MV

Space medicine has long studied the impact of reduced gravity on the human body. Increasing complaints of insufficient visual acuity during and after space flights have been recently drawing a lot of attention to the effects of hypogravity on astronauts’ vision. Abnormally high intraocular pressure (IOP) is one of the most clinically important changes occurring during space missions. It is a serious condition that often causes irreversible damage to the optic nerve and blindness. The aim of this study was to explore the effect of reduced gravity on IOP. The study recruited 48 young healthy men with the mean age of 22 years, who formed 2 equally sized groups. In the experimental group, hypogravity was simulated by placing the subjects into the orthostatic position for 21 days. IOP was measured at 4 time points using a Maklakov tonometer. Z-approximation of the Wilcoxon T test was applied. The average increase in IOP in the experimental group was 3.42 ± 0.03 mmHg (р < 0.01). The changes were, however, transient, and IOP levels went back to normal right after the exposure to hypogravity conditions was terminated.

Received: 2019-06-03

Published online: 2019-06-19

DOI: 10.24075/brsmu.2019.041

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VIEWS 4594

Goltsov AYu, Mukosey IS, Kochetkova TO, Shubina J, Kuznetsova MV, Stupko OK, Barkov IYu, Rebrikov DV, Trofimov DYu

Timely detection of fetal aneuploidy is an important aspect of clinical practice. At present, analytical techniques involving high-throughput sequencing are on the rise. Noninvasive prenatal testing (NIPT) ensures reliable results as early as week 9–11 into pregnancy. This article describes a clinical case of NIPT application and further verification of its results. Using next-generation sequencing, the microarray analysis of cell-free DNA in the amniotic fluid and the cytogenetic analysis of fetal chromosomes, a high risk of chromosomal rearrangements was detected in the short arms of chromosomes 4 and 12. This prediction was verified by molecular karyotyping conducted in both parents. The mother was found to be a balanced carrier of translocations between chromosomes 4 and 12. This case demonstrates the advantages of a whole-genome approach to NIPT over targeted-based.

Received: 2019-05-24

Published online: 2019-06-15

DOI: 10.24075/brsmu.2019.040

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VIEWS 5237