Effect of Cold Drawing and Annealing in Thermomechanical Treatment Route on the Microstructure and Functional Properties of Superelastic Ti-Zr-Nb Alloy.

In this study, a superelastic Ti-18Zr-15Nb (at. %) alloy was subjected to thermomechanical treatment, including cold rotary forging, intermediate annealing, cold drawing, post-deformation annealing, and additional low-temperature aging. As a result of intermediate annealing, two structures of -phase were obtained: a fine-grained structure (d ≈ 3 µm) and a coarse-grained structure (d ≈ 11 µm).

Avidity of IgG to SARS-CoV-2 RBD as a Prognostic Factor for the Severity of COVID-19 Reinfection.

The avidity index (AI) of IgG to the RBD of SARS-CoV-2 was determined for 71 patients with a mild (outpatient) course of COVID-19, including 39 primarily and 36 secondarily reinfected, and 92 patients with a severe (hospital) course of COVID-19, including 82 primarily and 10 secondarily infected. The AI was shown to correlate with the severity of repeated disease. In the group of outpatients with a mild course, the reinfected patients had significantly higher median AIs than those with primary infections (82.

New prognostic criterion for the outcome of pregnancy in patients with threatening preterm birth.

To identify new criteria for predicting the outcome of pregnancy in women with threatened preterm labor based on the establishment of the characteristics of differentiation and functional activity of memory T-cells in the population of CD8 + T-lymphocytes. The study involved 56 women with threatened preterm labor at 22-34 weeks of pregnancy. Depending on the outcome of pregnancy, patients were divided into 3 groups: Group I included 22 women by premature labor; group II - 34 women whose pregnancy ended by deliver at term.

Character of β-lymphocytes differentiation in women with hypertensive disorders during pregnancy.

The aim of the work was to identify the features of B-lymphocyte differentiation in women with hypertensive disorders of various origins, to establish their relationship with indicators of the elastic properties of the vascular wall, and to develop additional diagnostic criteria for the severity of preeclampsia. We examined 193 women at 24-40 weeks of gestation. Of these, 39 women with chronic arterial hypertension, 35 women with preeclampsia that developed against the background of chronic arterial hypertension, 55 with preeclampsia.

Correction to: Role of β Cell Precursors in the Regeneration of Insulin-Producing Pancreatic β Cells under the Influence of the Pegylated Form of Glucagon-Like Peptide 1.

The title of the article should read:"Role of β Cell Precursors in the Regeneration of Insulin-Producing Pancreatic β Cells under the Influence of the Pegylated Form of Glucagon-Like Peptide 1".

Role of β Cell Precursors in the Regeneration of Insulin-Producing Pancreatic β Cells under the Influence of Glucagon-Like Peptide 1.

The effects of the pegylated form of glucagon-like peptide 1 (pegGLP-1) on oligopotent β cell precursors (CD45TER119CD133CD49f) in the pancreas were studied in C57Bl/6 mice. Under conditions of streptozotocin-induced type 1 diabetes mellitus, intraperitoneal injection of pegGLP1 increased the content of β cell precursors and dithizone-stained cells in the pancreas. β Cell precursors of mice with diabetes demonstrated high self-maintenance potential.

Role of Sertoli and Leydig Cells in the Regulation of Spermatogonial Stem Cell and Development of Reproductive Disorders in Male C57Bl/6 Mice with Type 1 Diabetes Mellitus.

Course administration streptozotocin to male C57Bl/6 mice induces a complex of symptoms typical of type 1 diabetes mellitus: hyperglycemia and insulin deficiency, focal inflammatory infiltration of the pancreas, destructive changes in the Langerhans islets, damage to the insular apparatus (reduced number of PDX1 cells and insulin expression by the secreting cells). Male reproductive disorder are serious complications of type 1 diabetes mellitus. In "diabetic" mice, interstitial edema with inflammatory infiltration and microvascular disorders in the testicular tissue are observed, the number of endothelial precursors (CD45/CD31) and the total number and percentage of motile spermatozoa decreased, immature spermatogenic epithelium cells are desquamated of into the lumen of the tubules.

Regenerative Potential of Spermatogonial Stem Cells, Endothelial Progenitor Cells, and Epithelial Progenitor Cells of C57Bl/6 Male Mice with Metabolic Disorders.

The properties of spermatogonial stem cells, endothelial progenitor cells, and the epithelial progenitors of C57Bl/6 mice under conditions of metabolic disorders were studied using the model of busulfan-induced suppression of spermatogenesis and in vitro culture technique. Spermatogonial stem cells CD117-CD90 and epithelial progenitors CD45-CD31-Sca-1CD49f derived from the testes of mice with metabolic disturbances demonstrated 17- and 28-fold increase in the respective cell mass and generated cell colonies in vitro. In contrast, spermatogonial stem cells with immune phenotype CD51-CD24CD52 had reduced selfrenewal capacity.

Regenerative Potential of Stem and Progenitor Cells from Ischemic Testes of C57Bl/6 Mice in Culture and in the Model of Spermatogenesis Suppression Caused by Busulfan.

The regenerative potential of stem and progenitor cells from ischemic testes of C57Bl/6 mice was studied in vitro (cell culture) and in vivo (mouse model of busulfan-induced suppression of spermatogenesis). Spermatogonial stem cells with phenotypes CD117CD90 and CD51CD24CD52 from ischemic testes demonstrated 33-fold and 7-fold increments of cell mass and generated colonies in vitro. Epithelial (CD45CD31Sca-1CD49f) and endothelial (CD45CD31) precursors exhibited lower self-renewal capacity.

Role of Tissue-Specific Stem and Progenitor Cells in the Regeneration of the Pancreas and Testicular Tissue in Diabetic Disorders.

Using the model of hypogonadism in C57Bl/6 male mice, we showed that injection of streptozotocin to newborn animals and high-fat diet induced serum IFN-γ and IL-17 elevation, glucose metabolism disturbances, insulin resistance, destructive changes of the Langerhans islets (deficit of PDX1β cells), while the number of oligopotent β cell precursors (CD45TER119CD133CD49f) increased. Diabetes played the role of an inducer of testicular tissue inflammation (pan-hemopoietic cell infiltration, increase of IL-2, IL-17, and IL-23 content) and reproductive system disturbances in mice (decrease in free testosterone concentration, suppression of spermatogenesis, and infertility). The development of hypogonadism was paralleled by an increase in the count of spermatogonial stem cells (CD117CD29CD90), multipotent mesenchymal stromal cells (CD45CD31CD90CD106), hemangiogenesis precursors (CD45CD117Flk1), and epithelial cells (CD45CD31CD49fCD326).

[The markers of inflammation reaction and dysfunction of endothelium in pregnant women with hypertension disorders of various genesis].

The markers of endothelium dysfunction and factors of inflammation in pregnant women with hypertension with hypertension disorders of various genesis were analyzed. The clinical laboratory study was carried out on the basis of sampling of 158 women at pregnancy period of22-3 7 weeks. Out of this sampling 30 women had previously present chronic arterial hypertension, 3 0 women had chronic arterial hypertension and consecutive preeclampsia, 43 women had preeclampsia and 55 women had uncomplicated course of pregnancy without hypertension disorders (control group).

Response of Stem and Progenitor Cells to Testicular Ischemia.

Stem and progenitor cells were studied on mouse model of testicular ischemia. Testicular ischemia led to a decrease in free testosterone concentration. Hemodynamic changes, interstitial edema, and destruction of spermatogenic epithelium, Leydig, and Sertoli cells were observed in the testicular tissue.

Effect of alvitili on immunological parameters in often ailing children.

The problem of the rehabilitation of often ailing children is not yet elucidated despite of a substantial amount of research done in this field. It is acknowledged that the impairment of immune reactivity is a pathogenetic foundation of often and prolonged respiratory diseases in children. In this connection, the aim of the study was to evaluate the effect of alvitili on the main immunologic parameters in children who get ill frequently.

Regulation of Expression of Lymphocyte Activation Markers by Neutrophil Factors Secreted during Pregnancy.

The work was outlined to elucidate contribution of soluble factors produced by peripheral neutrophils from healthy pregnant women and those with EPH-gestosis to regulation of expression of surface activation markers by donor lymphocytes. It was found out that in healthy pregnant women neutrophil factors stimulated expression of HLA-DR and CD25 antigens by T lymphocytes. In women with EPH-gestosis neutrophil factors, which comprised soluble antigen of leukocytes 2 (SAL-2), enhanced expression of CD25 antigen in B subset.