Репозиторий Университета

Thanks to their biocompatibility, biodegradability, injectability and self-setting properties, calcium phosphate cements (CPCs) have been the most economical and effective biomaterials of choice for use as bone void fillers. They have also been extensively used as drug delivery carriers owing to their ability to provide for a steady release of various organic molecules aiding the regeneration of defective bone, including primarily antibiotics and growth factors. This review provides a systematic compilation of studies that reported on the controlled release of drugs from CPCs in the last 25 years. The chemical, compositional and microstructural characteristics of these systems through which the control of the release rates and mechanisms could be achieved have been discussed. In doing so, the effects of (i) the chemistry of the matrix, (ii) porosity, (iii) additives, (iv) drug types, (v) drug concentrations, (vi) drug loading methods and (vii) release media have been distinguished and discussed individually. Kinetic specificities of in vivo release of drugs from CPCs have been reviewed, too. Understanding the kinetic and mechanistic correlations between the CPC properties and the drug release is a prerequisite for the design of bone void fillers with drug release profiles precisely tailored to the application area and the clinical picture. The goal of this review has been to shed light on these fundamental correlations.

Thanks to their biocompatibility, biodegradability, injectability and self-setting properties, calcium phosphate cements (CPCs) have been the most economical and effective biomaterials of choice for use as bone void fillers. They have also been extensively used as drug delivery carriers owing to their ability to provide for a steady release of various organic molecules aiding the regeneration of defective bone, including primarily antibiotics and growth factors. This review provides a systematic compilation of studies that reported on the controlled release of drugs from CPCs in the last 25 years. The chemical, compositional and microstructural characteristics of these systems through which the control of the release rates and mechanisms could be achieved have been discussed. In doing so, the effects of (i) the chemistry of the matrix, (ii) porosity, (iii) additives, (iv) drug types, (v) drug concentrations, (vi) drug loading methods and (vii) release media have been distinguished and discussed individually. Kinetic specificities of in vivo release of drugs from CPCs have been reviewed, too. Understanding the kinetic and mechanistic correlations between the CPC properties and the drug release is a prerequisite for the design of bone void fillers with drug release profiles precisely tailored to the application area and the clinical picture. The goal of this review has been to shed light on these fundamental correlations.

© 2020, International Osteoporosis Foundation and National Osteoporosis Foundation. Summary: Basketball athletes possess a higher bone mineral density (BMD) than matched non-athletes and swimming, soccer, and volleyball athletes. Differences appear to be exacerbated with continued training and competition beyond adolescence. The greater BMD in basketball athletes compared to non-athletes, swimming, and soccer athletes is more pronounced in males than females. Purpose: The aim of this study was to examine differences in total and regional bone mineral density (BMD) between basketball athletes, non-athletes, and athletes competing in swimming, soccer, and volleyball, considering age and sex. Methods: PubMed, MEDLINE, ERIC, Google Scholar, and Science Direct were searched. Included studies consisted of basketball players and at least one group of non-athletes, swimming, soccer, or volleyball athletes. BMD data were meta-analyzed. Cohen’s d effect sizes [95% confidence intervals (CI)] were interpreted as: trivial ≤ 0.20, small = 0.20–0.59, moderate = 0.60–1.19, large = 1.20–1.99, and very large ≥ 2.00. Results: Basketball athletes exhibited significantly (p < 0.05) higher BMD compared to non-athletes (small-moderate effect in total-body: d = 1.06, CI 0.55, 1.56; spine: d = 0.67, CI 0.40, 0.93; lumbar spine: d = 0.96, CI 0.57, 1.35; upper limbs: d = 0.70, CI 0.29, 1.10; lower limbs: d = 1.14, CI 0.60, 1.68; pelvis: d = 1.16, CI 0.05, 2.26; trunk: d = 1.00, CI 0.65, 1.35; and femoral neck: d = 0.57, CI 0.16, 0.99), swimming athletes (moderate-very large effect in total-body: d = 1.33, CI 0.59, 2.08; spine: d = 1.04, CI 0.60, 1.48; upper limbs: d = 1.19, CI 0.16, 2.22; lower limbs: d = 2.76, CI 1.45, 4.06; pelvis d = 1.72, CI 0.63, 2.81; and trunk: d = 1.61, CI 1.19, 2.04), soccer athletes (small effect in total-body: d = 0.58, CI 0.18, 0.97), and volleyball athletes (small effect in total-body: d = 0.32, CI 0.00, 0.65; and pelvis: d = 0.48, CI 0.07, 0.88). Differences in total and regional BMD between groups increased with age and appeared greater in males than in females. Conclusion: Basketball athletes exhibit a greater BMD compared to non-athletes, as well as athletes involved in swimming, soccer, and volleyball.

© 2020 Elsevier GmbH Background: The classical anatomical representation of the lingual relief of the mental region of the mandible reflects the presence of geniohyoid as well as genioglossus attachment areas, which are divided into two or single areas. The International Anatomical Terminology (contains references to the presence of upper and lower spinae mentales, but the terminology does not reflect the content of these structures. The aim of this study was to examine and classify the lingual canals of the mental region. Materials and methods: Using a Sirona ORTHOPHOS XG 3D tomograph (isotropic voxel size 0.1 in high-resolution mode) and KaVo 3D eXam cone beam computed tomography, the mental region of the mandible was analyzed in 561 patients aged 18–75 years with regard to bone density and the occurrence of a canal opening on the lingual side of the mandible. In order to visualize the mental spine area, another 50 mandibles were analyzed, divided into two groups of 25 mandibels each: 25 native and 25 dry preparations. Results: By prevalence the following channel types were classified: in 33% type I (narrow); in 32% type II (double) and of these in 17.5% (convergent) and type IIb in 14.5% a type IIb subtype (non-convergent); in 14% type III (wide); in 12% type IV (hook-shaped) and in 9% type V (diverging channel), identifying three combined components: the system of channels of the superior and inferior mental spine, and the transversal intraosseous canal of the mental region of the mandible. Conclusions: Our anatomical and radiological approach allowed us to suggest a new classification of intraosseous organization of the anterior part of the human mandible. As a result of studying X-ray anatomical and anatomical-topographical, constitutional-based, structural features of the mandible, intraosseous structures of the anterior mandible were clarified and classified, which solve not only terminological disputes, but also are important clinical guidelines for bone surgery, prosthetics, traumatology, endodontic treatment, dental implantation and local anesthesia.

© 2020 Elsevier B.V. A critical-sized calvarial defect in rats is employed to reveal the osteoinductive properties of biomaterials. In this study, we investigate the osteogenic efficiency of hybrid scaffolds based on composites of a biodegradable and biocompatible polymer, poly(3-hydroxybutyrate) (PHB) with hydroxyapatite (HA) filled with alginate (ALG) hydrogel containing mesenchymal stem cells (MSCs) on the regeneration of the critical-sized radial defect of the parietal bone in rats. The scaffolds based on PHB and PHB/HA with desired shapes were prepared by two-stage salt leaching technique using a mold obtained by three-dimensional printing. To obtain PHB/HA/ALG/MSC scaffolds seeded with MSCs, the scaffolds were filled with ALG hydrogel containing MSCs; acellular PHB/ALG and PHB/ALG filled with empty ALG hydrogel were prepared for comparison. The produced scaffolds have high porosity and irregular interconnected pore structure. PHB/HA scaffolds supported MSC growth and induced cell osteogenic differentiation in a regular medium in vitro that was manifested by an increase in ALP activity and expression of the CD45 phenotype marker. The data of computed tomography and histological studies showed 94% and 92%, respectively, regeneration of critical-sized calvarial bone defect in vivo at 28th day after implantation of MSC-seeded PHB/HA/ALG/MSC scaffolds with 3.6 times higher formation of the main amount of bone tissue at 22–28 days in comparison with acellular PHB/HA/ALG scaffolds that was shown at the first time by fluorescent microscopy using the original technique of intraperitoneal administration of fluorescent dyes to living postoperative rats. The obtained in vivo results can be associated with the MSC-friendly microstructure and in vitro osteogenic properties of PHB/HA base-scaffolds. Thus, the obtained data demonstrate the potential of MSCs encapsulated in the bioactive biopolymer/mineral/hydrogel scaffold to improve the bone regeneration process in critical-sized bone defects.

© 2019 Elsevier Ltd Attenuation and velocity (Speed-of-Sound) in a trabecular bone were calculated and evaluated from ultrasound pulse-echoes detection and their processing, applying a single US transducer that operates in transmit/receive mode. The processing of US pulse-echoes utilized development of algorithms for the attenuation and the Speed-of-Sound in trabecular bone. These ultra-sound pulse-echoes were obtained from the front and rear surfaces of a trabecular bone sample. The motivation for this work was to develop an efficient intraosseous monitoring device that provides the Speed-of-Sound and attenuation intraoperatively and in real-time and therefore can be implemented during a surgery. Ultrasonic measurements were performed in the frequency range of 3.5–6.5 [MHz]. In these experiments, the fresh trabecular bone samples were from sheep femora and humerus. The measuring results were correlated (R2 ≥ 0.95) with those obtained previously, mainly during transmission mode studies. According to the obtained results, the presented method presumably will be utilized as a clinical tool in bone surgical procedures and therefore will be able to provide better outcomes, while monitoring intraoperatively and in real-rime intraosseous trabecular bone attenuation and its velocity: In the next stage of this study, the method will be carried out on human tissues and also intraoperatively, during human clinical trials. It is planned to perform it on long bones/tibia, vertebra, in neurosurgery – for drilling the skull and also in dental implantation surgery.

This study aimed to investigate the effects of propofol through evaluating its interaction with nitric oxide (NO), hydrogen sulfide (H2S), and carbon monoxide (CO). Wistar male rats were divided in 4 groups: (1) bolus injection of propofol (1% 10 mg/mL, 100 mg/kg bw, i.p.); (2) Nω-nitro-l-arginine methyl ester (L-NAME; NO synthase inhibitor, 60 mg/kg bw, i.p.) + bolus injection of propofol (1% 10 mg/mL, 100 mg/kg bw, i.p.); (3) DL-propargylglycine (DL-PAG; H2S synthase inhibitor, 50 mg/kg bw, i.p.) + bolus injection of propofol (1% 10 mg/mL, 100 mg/kg bw, i.p.); (4) zinc protoporphyrin IX (ZnPPIX; CO synthase inhibitor, 50 μmol/kg bw, i.p.) + bolus injection of propofol (1% 10 mg/mL, 100 mg/kg bw, i.p.). Increased levels of albumins, low-density lipoproteins, alkaline phosphatase, amylase, high-sensitivity Troponin T, and fibrinogen were found in L-NAME + propofol group. Platelet crit, platelet count, total cholesterol, and high-density lipoproteins were elevated in ZnPPIX + propofol group. Hydrogen peroxide was increased in all groups treated with gasotransmitters inhibitors. Reduced glutathione was reduced in all groups, superoxide dismutase activity only in L-NAME + propofol. The effect of propofol on various biochemical, haematological, and oxidative stress markers may be at least in part mediated through interaction with 3 estimated gasotransmitters.

© 2019 The authors. Estrogens may affect bone growth locally or systemically via the known estrogen receptors ESR1, ESR2 and G protein-coupled estrogen receptor 1 (GPER1). Mouse and human growth plate chondrocytes have been demonstrated to express GPER1 and ablation of this receptor increased bone length in mice. Therefore, GPER1 is an attractive target for therapeutic modulation of bone growth, which has never been explored. To investigate the effects of activated GPER1 on the growth plate, we locally exposed mouse metatarsal bones to different concentrations of the selective GPER1 agonist G1 for 14 days ex vivo. The results showed that none of the concentrations of G1 had any direct effect on metatarsal bone growth when compared to control. To evaluate if GPER1 stimulation may systemically modulate bone growth, ovariectomized C57BL/6 mice were treated with G1 or β-estradiol (E2). Similarly, G1 did not influence tibia and femur growth in treated mice. As expected, E2 treatment suppressed bone growth in vivo. We conclude that ligand stimulation of GPER1 does not influence bone growth in mice.

© 2018; Pediatria Ltd. All rights reserved. Search for biomarkers, reflecting the severity of inflammation and damage to kidney tissue in children with pyelonephritis is very important. Objective of the research - to study clinical significance of lipocalin 2 associated with neutrophil gelatinase (uNGAL) in urine as a marker of renal parenchymal lesion severity in children with pyelonephritis debut. Study materials and methods: 73 children with pyelonephritis debut hospitalized in the nephrologic department were examined. Children were divided into 2 groups: 1st group - 41 children with acute pyelonephritis (without USO abnormalities), 2nd group - 32 children with acute pyelonephritis combined with various abnormalities of urinary system organs. In all patients, the levels of urea, creatinine, cystatin C, procalcitonin, renal concentration capacity, uric excretion of lipocalin 2 associated with neutrophil gelatinase (uNGAL) were assessed. Results: the study revealed that the level of uNGAL/Cr excretionat the admission in children of both main groups did not differ significantly. A positive correlation was found between uNGAL/Cr value and cystatin C level in patients of the 2nd group. All children had a direct correlation between the duration of febrile fever from the onset of antibiotic therapy and the uNGAL/Cr excretion level. The study also revealed a correlation between uNGAL/Cr excretion level in the acute period of the disease and the degree of renal parenchymal lesion in children from the first and second groups confirmed by static DMCA nephroscintigraphy. Conclusion: a high urinary excretion of uNGAL/Cr in patients with acute pyelonephritis indicates a marked renal parenchyma lesion and requires static nephroscintigraphy with further observation, but not earlier than 6 months after the normalization of clinical-laboratory indicators.

© 2018 The American Society of Gene and Cell Therapy Treatment of myocardial infarction (MI) with bone marrow cells (BMCs) improves post-MI cardiac function in rodents. However, clinical trials of BMC therapy have been less effective. While most rodent experiments use young healthy donors, patients undergoing autologous cell therapy are older and post-MI. We previously demonstrated that BMCs from aged and post-MI donor mice are therapeutically impaired, and that donor MI induces inflammatory changes in BMC composition including reduced levels of B lymphocytes. Here, we hypothesized that B cell alterations in bone marrow account for the reduced therapeutic potential of post-MI and aged donor BMCs. Injection of BMCs from increasingly aged donor mice resulted in progressively poorer cardiac function and larger infarct size. Flow cytometry revealed fewer B cells in aged donor bone marrow. Therapeutic efficacy of young healthy donor BMCs was reduced by depletion of B cells. Implantation of intact or lysed B cells improved cardiac function, whereas intact or lysed T cells provided only minor benefit. We conclude that B cells play an important paracrine role in effective BMC therapy for MI. Reduction of bone marrow B cells because of age or MI may partially explain why clinical autologous cell therapy has not matched the success of rodent experiments. Implantation of bone marrow cells into mouse hearts after myocardial infarction is therapeutic, but if the cells are from donors that are older or post-MI (mimicking autologous cell therapy), they are less effective. This report presents evidence that a decrease in B lymphocytes is responsible for the reduced therapeutic response.

© 2018  Extensive scar tissue formation often occurs after severe burn injury, trauma, or as one of complications after surgical intervention. Despite significant therapeutic advances, it is still a significant challenge to manage massive scar tissue formation while also promoting normal wound healing. The goal of this study was to investigate the therapeutic effect of bone mesenchymal stem cells (BMSCs) that were genetically modified to overexpress transforming growth factor-beta 3 (TGF-β 3 ), an inhibitor of myofibroblast proliferation and collagen type I deposition, on full-thickness cutaneous wound healing in a rabbit model. Twenty-four rabbits with surgically-induced full-thickness cutaneous wounds created on the external ear (1.5 × 1.5 cm, two wounds/ear) were randomized into four groups: (G1), wounds with no special treatment but common serum-free culture medium as negative controls; (G2), topically-applied recombinant adenovirus, expressing TGF-β 3 /GFP; (G3), topically-applied BMSCs alone; (G4), topically-applied BMSCs transfected with Ad-TGF-β 3 /GFP (BMSCs TGF-β3 ); and (G5), an additional normal control (n = 2) with neither wound nor treatment on the external ear skin. The sizes of wounds on the ear tissues were grossly examined, and the scar depth and density of wounds were histologically evaluated 21, 45, and 90 days after surgical wound creation. Our results demonstrated that G4 significantly reduced the wound scar depth and density, compared to G1~3. Numbers of cells expressing GFP significantly increased in G4, compared to G2. The protein expression of TGF-β 3 and type III collagen in G4 significantly increased, while the ratio of type I to type III collagen was also significantly reduced, which is similar to the tissue architecture found in G5, as compared the other treatment groups. In conclusion, transplantation of BMSCs TGF-β3 remarkably improves wound healing and reduces skin scar tissue formation in an animal model, which may potentially provide an alternative in the treatment of extensive scar tissue formation after soft tissue injury.

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. Experimental validation of the method for regulation of stem cell proliferation and differentiation is carried out. The method consists in exposure to ultrahigh frequency electromagnetic radiation, modulated by infralow frequencies with variable parameters. A specially designed programmer, setting up the parameters of exposure, is connected to the source of radiation. The zones of anatomical location of the red bone marrow of rats were exposed for 15 min to the amplitude-modulated electromagnetic radiation of ultrahigh frequency range. The parameters of exposure were determined in previous studies. The red bone marrow was collected from the sternum and head of the femur. The cellular composition of the red bone marrow was evaluated 1, 2, 3, and 6 days after the exposure. The optimal therapeutic mode of irradiation was then chosen, leading to stem cell activation with subsequent proliferation and differentiation into mature red bone marrow cells.

© 2018 Russian Transplant Society. All rights reserved. Aim. To establish the ability of the total RNA extracted from the body’s bone marrow cells (BMCs), in which liver tissue was damaged, to serve as a carrier of targeted regenerative signals to this organ. Materials and methods. By method of adoptive transfer in rats (n = 37) the mitotic and proliferative activity of liver and kidney cells were studied in intact recipients after intraperitoneal injection: the mononuclear BMCs – 2,5×106; 5,0×106; 3,5×107 cells – group 1 and the total RNA of the same BMCs (30μg/100g of weight) – group 2 from donors in 12 hours after 70–75% of hepatectomy; in group 3 (control), a saline solution was injected. RNA from BMCs was extracted by the method developed by the «Evrogen» firm (Russia) with the reagent Extract RNA. Results. In group 2 in 48 and 72 h. there was the increasing of mitotic and proliferative cell activity in the liver, but not in the kidneys (control of the specificity of regenerative signals); in group 1 there was no transfer of regenerative signals to these organs. Conclusion. The authors believe that the total RNA from BMCs, activated by hepatectomy, accumulates targeted (hepatospecific) regeneration signals, but they are perceived only when RNA has been obtained by the damaged tissue.

© 2018 Publishing House of the Union of Pediatricians. All rights reserved. A calcium deficiency is detected in more than 80% of children. This is the result of inadequate consumption of milk and dairy products which are the main food sources of calcium. There is a correlation between deficiency of calcium intake with food in childhood and the risk of osteopenia and osteoporosis in subsequent life periods. With insufficient exogenous intake of calcium, its concentration in the blood decreases which stimulates bone resorption. The factors that further limit the consumption of dairy products are lactase deficiency and cow's milk protein allergy. In order to ensure the intake of the necessary amount of calcium, it is advisable to use vitaminmineral complexes in children that contain not only a sufficient amount of calcium and Vitamin D but also other micronutrients required for bone formation.

It reports the results of primary basal blood flow in partially edentulous bone tissue with atrophy, as well as comparative evaluation of haemomicrocirculation level of the alveolar bone mucosa after bone augmentation via tunneling and conventional methods. The results of the initial state of microcirculation in the mucous membrane of the alveolar process in the partially edentulous area show a 45% decrease of blood flow (M), its intensity (s) by 60%. Microcirculatory shifts in blood flow levels indicators, its intensity, vasomotor activity are more evident when using the conventional method, where revascularization takes more than five months. When using the tunnel method, there is an improvement in haemodynamic mechanisms of tissue blood flow regulation. Microcirculation is restored 4 months after surgery.

© 2018 Publishing House of the Union of Pediatricians. All rights reserved. Background. Solid tumors in children are one of the most common childhood malignancy, second only to hemoblastosis. Among solid tumours, about 5% are bone sarcomas: osteosarcoma (3%) and Ewing's sarcoma (2%). Atypicality of the these diseases course makes an early diagnosis a real challenge. Case Reports. The article presents six clinical observations of patients with bone sarcomas. We demonstrate the difficulties in diagnosing of this disease group which is associated with the absence of both specific symptoms and distinct clinical picture. Conclusion. Pediatricians and pediatric surgeons should take into account the possibility of atypical course of bone sarcomas in children. Low cancer alertness is the reason for a significant delay in establishing the correct diagnosis which contributes to the tumour process generalization and reduces the chances of achieving remission while increasing the cost of treating such patients.

© 2018 S. Karger AG.All right reserved. Objective: to estimate the state and the rate of bone metabolism in women with chronic kidney disease (CKD) 1-3 stages during pregnancy. Materialsandmethods:observational cross-sectional and prospective study included 137 pregnant women. CKD 1-3 stage had 85 of them: 64 with CKD 1-2 stage, 21 with CKD 3 stage. Median age 29 years, second and third trimester (42 and 37, respectively). The comparison group consisted of 52 pregnant women with of the same age and gestational age without CKD. Dynamic examination was carried out in 18 cases with CKD 1-3 stage. Ionized, total calcium and inorganic phosphorus, 25-OH vitamin D, parathyroid hormone (PTH), the activity of total alkaline phosphatase (ALP), osteocalcin (OC), N-terminal propeptid of type 1 procollagen (P1NP) and β-isomer of C-terminal telopeptide of type I collagen (β-CTX) were determined. Results: serum calcium, phosphorus and PTH levels in all the examined pregnant women were within their normal range. In pregnant with CKD 3 stage, a deficiency of vitamin D was more significant (р0.02) compared to pregnant women without CKD and pregnant with CKD 1-2 stage. The levels OC and P1NP and β-CTX in pregnant with CKD 3 stage were higher than in the control group and pregnant women with CKD 1-2 stage. It was also higher in pregnant women with CKD 1-3 stages in the third trimester in comparison with the second one, although remained within the limits of reference values. Significant direct correlations were found between serum concentrations of P1NP and OC (r=0.575, р0.001), P1NP and ALP (r=0.415, р=0.001), OC and ALP (r=0.276, р=0, 02) and vitamin D and PTH (r=0.235, р=0.04). A significant inverse correlation was found between the blood levels of vitamin D and P1NP (r=-0.344, р=0.002). Conclusions: the peculiarities of bone metabolism in pregnant with CKD of 3 stage are manifested by the vitamin D deficiency and the acceleration of bone formation and resorption to a greater extent in the third trimester.

© 2018 National Academy of Pediatric Science and Innovation. All rights reserved. Solid tumors in children occupy the second place in the structure of morbidity, yielding to hemoblastosis. Among solid tumors, approximately 5% are bone sarcomas: osteosarcoma (3%) and Ewing's sarcoma (2%). Atypicality of the course of these diseases makes it difficult to diagnose them early. The article describes a series of clinical observations of patients with bone sarcomas, which illustrate the complexity of diagnosing diseases of this group.

© 2018, SPb RAACI. Ability of mesenchymal multipotent stromal cells (MSCs) to differentiate into several types of mesenchymal tissues allows to consider these cells the main candidates for creating tissue engineering constructions for regenerative medicine. MSCs promote integration of bio-implants into the native bone and stimulate osteogenesis. MSCs are characterized by immunomodulatory properties, due to inflammation control and modification of immune cells. MSCs affect not only the in vivo immune response by preventing immunological rejection of implanted tissue engineering designs, but it can also influence the bone tissue immunity. MSCs play an important role in bone regeneration, by regulating the osteoblastic generation, and suppressing activity of inflammation effectors and osteoclastogenesis. Some pre-clinical and first clinical trials of bone bio-implants colonized with MSC, demonstrate promising outlooks for this strategy in order to obtain tissue engineering constructions for bone regeneration.

© 2018 Human Stem Cell Institute. All rights reserved. Cell therapy is one of the most promising directions in the treatment of critical limb ischemia (CLI). In spite of certain advances achieved in this field in the last decades, which are related to application of bone marrow stem cells (BMSC), a large number of problems still remain unsolved. In this review, we discuss the BMSC biology, mechanisms of their therapeutic effect in the CLI treatment and results of the most notable BMSC-based clinical studies in detail.