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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Shishelova AYu, Guseva OYu, Kopetskiy IS, Ansari V

The chewing experience acquired during ontogeny may lead to developing functional asymmetry of the masticatory apparatus, adversely affecting the maxillofacial region functions. The study aimed to assess asymmetry of the masticatory muscle activity in healthy individuals showing no dentofacial system dysfunction. In 17 volunteers (6 males, 11 females aged 18–23 years), motor functional asymmetry of the brain was assessed using standard motor tests, and surface electromyogram (EMG) of the masseter (MM) and temporalis muscle (TMs) was recorded on the right and left sides: in the resting state, with the maximum voluntary bite force, during deliberate unilateral mastication (alternately on the left and right sides), and bilateral voluntary chewing. Three groups with various asymmetry manifestations were distinguished and characterized based on the asymmetry indices of standard EMG parameters (integrated EMG (AIint), average amplitude (AIav), and chewing bursts duration (AId)) of the right and left muscles: 1) showing stable unilateral asymmetry of the MM and TM activity; 2) showing the “dynamic asymmetry” that was different for the MMs and TMs; 3) showing the “adaptive control”, when the muscle activity asymmetry was manifested adequately to the chewing test, and AIint of the MMs and TMs reached 40 ± 18% and 97 ± 20% during chewing on the left side, 242 ± 39% and 127 ± 32% during chewing on the right side, 115 ± 12% and 115 ± 24% during bilateral chewing. The major significant between-group differences in AIint, AIav, and AId were reported for the MMs (the impact of the “group” factor on these indices was as follows: F = 11.0, p < 0.01; F = 5.72 and F = 3.73, p < 0.05; repeated measures ANOVA). Thus, in young adulthood, some people develop functional asymmetry of the masticatory muscles in the form of excessive predominance of electrical activity on one side of the face with changes in both amplitude and duration of the “chewing” EMG bursts.

Received: 2025-05-19

Published online: 2025-06-19

DOI: 10.24075/brsmu.2025.031

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VIEWS 47

Kopetskiy IS, Pobozhieva LV, Kopetskaya AI

Indices that reflect individual oral hygiene levels are widely used to determine microbial plaque of the tooth surface. When teaching patients how to take care about the oral cavity, dentists use visual demonstration of the dental plaque localization. The quantitative light-induced fluorescence (QLF) technique represents a modern method to diagnose individual oral hygiene, in which even minimal microbial plaque buildup shows up as red fluorescence. The study aimed to assess the oral hygiene status using the quantitative light-induced fluorescence technique. Dental deposits were detected using QLF; the Quigley Hein, Green-Vermillion, DMF indices were detected clinically. The findings show that Simple Hygiene Scores do not exceed 2, when the caries intensity is very low or low (p < 0.05). In these groups, the Green-Vermillion and Quigley Hein index values reach 0.5 ± 0.23 and 0.2 ± 0.14, respectively. When the caries intensity is medium, Simple Hygiene Scores vary between 1–5 points. Very high caries intensity is characterized by the Simple Hygiene Score between 3 and 5 points (maximum Green-Vermillion and Quigley Hein index values reach 2.3 ± 0.43 and 2.1 ± 0.35) (p < 0.05). Thus, the quantitative light-induced fluorescence technique can be used in clinical trials for objective oral hygiene assessment, visual demonstration of dental plaque buildup to patients, and assessment of the dynamic changes in these indicators.

Received: 2025-04-23

Published online: 2025-06-06

DOI: 10.24075/brsmu.2025.030

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VIEWS 181

Zinchenko RA, Tebieva IS, Zakharova EYu, Shchagina OA, Lotnik EE, Gabisova YuV, Khokhova AV, Bakin NV, Marakhonov AV

Mass screening of newborns for 36 hereditary diseases in the Russian Federation will enable the reduction of childhood disability and mortality from hereditary disorders, as well as the identification of all-Russian and regional population-genetic features of the screened disorders. The study aimed to assess the results of newborn screening (NBS), including expanded newborn screening (ENBS), in the Republic of North Ossetia-Alania obtained between January 1, 2023, and December 31, 2024, as well as to study clinical and population-genetic characteristics of the diseases screened in the region. In phase I of assessment, biochemical testing, tandem mass spectrometry, and DNA diagnostics were performed, and the TREС/KREС levels were determined in 14,994 newborns. In 355 cases (2.36%), positive values were revealed. In phase II, the necessary laboratory and subsequent confirmatory DNA diagnostics were carried out in 324 cases (91.2%): repeated analysis by MS/MS and DNA diagnostics (for hereditary metabolic diseases), immunophenotyping (for primary immunodeficiency states). During the 2-year study, a total of 37 diagnoses were established, which accounted for 0.25% of all children screened in phase I and clearly indicated the program's success and effectiveness. We managed to verify the specific spectrum of mutations characteristic of phenylketonuria (PKU) and medium-chain fatty acid acyl-CoA dehydrogenase deficiency (MCADD). The frequency of the disorder assessed within the framework of newborn screening was determined. The frequency of all PKU forms was 1 : 1153 newborns, and the frequency of MCADD was 1 : 789 newborns surveyed. All children are listed as sick in the medical genetic consultation of the Republic of North Ossetia-Alania; they receive treatment in accordance with the clinical guidelines.

Received: 2025-04-22

Published online: 2025-05-30

DOI: 10.24075/brsmu.2025.029

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VIEWS 230

Popova ES, Agbalyan AN, Titov VD, Moiseeva VP, Mashin SV, Anfimiadi VA, Zhukov GM, Bondarevskaya AO, Gavrilyuk LM

Currently, the occurrence of multiple primary malignant tumors is one of the complex and poorly understood issues of oncology. After the diagnosis of malignant neoplasm is established, the risk of a new primary, non-metastatic tumor increases in a patient. The paper presents a case report of the patient with four multiple primary malignant tumors in the duodenum and colon. Synchronous cancer of the cecum and rectosigmoid junction occurred after 9 months of the duodenal cancer pancreatoduodenal resection, photodynamic therapy, and 12 multiagent chemotherapy courses. The patient received 8 courses of chemotherapy with capecitabine, during which cancer progression was reported, and 16 multiagent chemotherapy courses. Two years later rectal cancer occurred, due to which rectal re-resection was conducted, along with 4 multiagent chemotherapy courses and target therapy. This clinical case emphasizes that it is necessary to perform additional assessment when treating patients with synchronous or metachronous multiple primary tumors to ensure the timely diagnosis and multidisciplinary approach to treatment of cancer patients.

Received: 2025-04-07

Published online: 2025-05-27

DOI: 10.24075/brsmu.2025.028

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VIEWS 259

Kiseleva VV, Vishnyakova PA, Kosyreva AM, Kananykhina EYu, Emelianov II, Elchaninov AV, Fatkhudinov TH

High fatality rate and the lack of pathophysiological therapy are typical for acute respiratory distress syndrome (ARDS). Intratracheal lipopolysaccharide (LPS) administration is used to model ARDS in animals. The method has the limitation of requiring the use of equipment to perform intubation and control the animal’s state. The study aimed to assess the possibility of using intranasal LPS administration instead of intratracheal and determine the LPS optimal dose. A total of 150 mL of the E. coli O111:B4 LPS (7.5 mg/kg or 15 mg/kg) or 0.9% NaCl was administered to 21 Sprague-Dawley rats. After 48 h blood was collected from the tail vein to determine the white blood cell count and TNFa concentration. The lungs were retrieved to assess dry weight (wet/dry ratio) and to determine the expression of the genes encoding pro- and anti-inflammatory cytokines using real-time PCR. The relative counts of CD68-, CD86-, and MHC II-positive cells in the lung tissue were also evaluated using flow cytometry. The w/d ratio was higher when the dose of 15 mg/kg of body weight was used (p = 0.0228, ordinary one-way Anova). Вlood lymphocyte counts were decreased (p = 0.0019, ordinary one-way Anova), and neutrophil counts were increased (p = 0.0021, ordinary one-way Anova) upon administration of both doses. The counts of CD86- (p = 0.0014, ordinary one-way Anova) and MHC II-positive cells (p = 0.0050, ordinary one-way Anova) increased after LPS administration. The IL10 gene expression was significantly increased upon administration of the dose of 15 mg/kg (p = 0.0024, ordinary oneway Anova), while the IL4 expression (p = 0.0194, ordinary one-way Anova) was decreased upon administration of the dose of 7.5 mg/kg. Thus, intranasal LPS administration can be used to model ARDS in the Sprague-Dawley rats. Administration of the high dose leads to the rapid development of inflammation in the lung.

Received: 2025-04-21

Published online: 2025-05-20

DOI: 10.24075/brsmu.2025.027

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VIEWS 377

Popov NS, Terekhov VM, Baranov MS, Balabanyan VYu, Kaurova DE, Myasnyanko IN, Terekhova EA

Assessment of pharmacologically active molecule biotransformation represents the most important phase of drug development, the results of which make it possible to identify active and toxic metabolites and provide a fundamental basis for the targeted design of new candidate drug molecules. The liver is the main organ involved in biotransformation of drugs. The currently widely used in vitro metabolism assessment methods do not allow one to identify products of extrahepatic drug molecule biotransformation. The study aimed to develop an in vivo approach to determination of the role of the liver in biotransformation of candidate drug molecules. The approach proposed is based on the vascular liver isolation performed surgically in laboratory rats. The organ involvement in biotransformation of pharmacologically active molecules is exemplified by the leader compound of the sydnone imine group possessing vasodilatory activity. It has been shown that elimination of the liver from systemic blood flow does not result in generation of the test compound metabolites identified by chromatography–mass spectrometry. The findings can provide the basis for prediction of drug pharmacokinetics, efficacy, and safety.

Received: 2025-04-16

Published online: 2025-05-15

DOI: 10.24075/brsmu.2025.026

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VIEWS 325

Rebrikov DV, Degtyareva AV, Yanushevich YuG, Gautier MS, Gorodnicheva TV, Bavykin AS, Ushakova LV, Filippova EA, Degtyarev DN, Sukhikh GT

Crigler–Najjar syndrome type I, an orphan UTG1A1 enzyme deficiency, manifests at birth with severe unconjugated hyperbilirubinemia. Here we describe sustained clinical response in a pediatric patient with Crigler–Najjar syndrome type I treated with two consecutive doses of AAV8 delivering the UTG1A1 coding sequence. Infusion I (6 × 1012 vg/kg) afforded sustained decrease in serum bilirubin, allowing substantial relaxation of the phototherapy from 12 h to 4 h daily. Infusion II at a double dose was made in 6 months; the decision was intended at complete elimination of phototherapy. However, the elimination led to a sharp increase in bilirubin levels necessitating resumption of phototherapy. The patient is currently stable on 4 h daily phototherapy for 80 weeks since the resumption and 107 weeks since the AAV8 therapy initiation. No toxic side effects were encountered. A slow incremental dynamics in serum bilirubin opens the issue of clinical advisability for subsequent infusions of the drug.

Received: 2025-04-25

Published online: 2025-04-30

DOI: 10.24075/brsmu.2025.025

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VIEWS 397

Minasov BSh, Yakupov RR, Akbashev VN, Shchekin VS, Vlasova AO, Minasov TB, Karimov KK, Akhmeldinova AA

Morphological subchondral bone tissue alterations associated with knee osteoarthritis represent a key pathogenesis link and can precede articular cartilage destruction. The study aimed to identify typical morphological and morphometric signs of osteosclerosis and osteoporosis in the subchondral zone of the femur and tibia. Analysis of 40 bone tissue fragments collected when performing knee replacement surgery in 20 patients (12 females and 8 males) aged 58–75 years with stage III–IV osteoarthritis was performed. Histological and morphometric assessment involving the use of light microscopy and microfracture index (MFI) calculation revealed significant differences in trabecular thickness, intertrabecular distance, and the degree of microdamage between the sites of sclerosis and osteoporosis. High MFI values in the zones of osteoporosis can reflect reduced subchondral bone strength. The findings confirm the diagnostic value of the subchondral zone morphometry and the prospects of using MFI as a quantitative risk criterion when planning orthopedic treatment.

Received: 2025-04-06

Published online: 2025-04-30

DOI: 10.24075/brsmu.2025.024

Comments 0

VIEWS 348