Soluble B7-H3 in Colorectal Cancer.

We present the results of comparative ELISA of the concentration of soluble form of immunity checkpoint B7-H3 (sB7-H3) in the serum of patients with colorectal cancer (CRC) at different stages before treatment and healthy control donors. The analysis revealed a statistically significant difference between the median levels of sB7-H3 in the blood serum of CRC patients (19.66 ng/ml) and healthy donors (16.

Sulfur isotopes of hydrothermal vent fossils and insights into microbial sulfur cycling within a lower Paleozoic (Ordovician-early Silurian) vent community.

Symbioses between metazoans and microbes involved in sulfur cycling are integral to the ability of animals to thrive within deep-sea hydrothermal vent environments; the development of such interactions is regarded as a key adaptation in enabling animals to successfully colonize vents. Microbes often colonize the surfaces of vent animals and, remarkably, these associations can also be observed intricately preserved by pyrite in the fossil record of vent environments, stretching back to the lower Paleozoic (Ordovician-early Silurian). In non-vent environments, sulfur isotopes are often employed to investigate the metabolic strategies of both modern and fossil organisms, as certain metabolic pathways of microbes, notably sulfate reduction, can produce large sulfur isotope fractionations.

Immunosuppression Factors PD-1, PD-L1, and IDO1 and Colorectal Cancer.

Due to the low efficiency of immunotherapy for colorectal cancer (CRC), it is extremely promising and relevant to study the mechanisms of immunosuppression. In this work, a comprehensive study of the expression of soluble and tissue forms of PD-1 and PD-L1 in blood serum and tumors of patients with CRC, as well as IDO1 in tumors was performed for the first time. The diagnostic and prognostic significance of the studied parameters was determined.

Analysis of Anti-Glycan IgG and IgM Antibodies in Colorectal Cancer.

We propose an approach that allows simultaneous determination of the levels of M and G isotypes of antibodies to the panel of glycans using microarrays. The level of IgG antibodies to 3'-O-su-Le glycan detects patients with colorectal cancer with a sensitivity of 69.77% and specificity of 62.

Development of hydrogel biochip for in vitro allergy diagnostics.

A hydrogel biochip was developed for the simultaneous quantitative determination of sIgE for 21 allergens and total IgE in human serum. The biochips are manufactured by photoinduced copolymerization of different molecules (allergens and antibodies) with gel-forming monomers resulting in the formation of three-dimensional hydrogel elements (1nl gel drops). After incubation of the biochip with the serum, the results are visualized using fluorescently labeled anti-IgE antibodies.

[Immunoassay of nine serological tumor markers on hydrogel-based microchip].

A prototype of test-system for simultaneous quantitative assay of nine tumor markers in blood serum was developed. The main constituent of the test-system is OM-9 biochip containing immobilized antibodies against nine oncomarkers: α-fetoprotein (AFP), carcinoembryonic antigen (CEA), human chorionic gonadotropin (HCG), cancer antigen 15-3 (CA 15-3), cancer antigen 125 (CA 125), cancer antigen 19-9 (CA 19-9), prostate-specific antigen, total (PSAtot) and free (PSAfree) forms, neuron-specific enolase (NSE). The biochip-based assay procedure for carrying out simultaneous quantitative determination of nine tumor markers in patient's blood serum: two-steps sandwich-immunoassay, was proposed.

[Acute colonic pseudoobstruction: Ogilvie's syndrome].

Based on literature and own original clinical data authors conclude that Ogilvie's syndrome is the form of dynamic obstruction of colon due to lesion of retroperitoneal neural nodes, heart failure and intoxication. Ogilvie's syndrome complicates therapeutic and surgical diseases. This syndrome can be manifested with acute abdomen symptoms and at 22% cases may be the cause of surgical treatment.

[Foreign bodies of the rectum].

The experience in the treatment of 143 patients with foreign bodies of the rectum and sigmoid colon is analyzed. Groups of foreign bodies are distinguished according to their size, structure and ways of occurring. Methods of extraction of foreign bodies in typical and non-typical situations are described.

[Treatment of epithelial coccygeal fistula].

Analysis of treatment of 822 patients with epithelial coccygeal fistula has demonstrated that purulent complication is indication for primary radical surgery. Number of complications and recurrences decreases if the first focus of inflammation is treated and epithelial fistula is resected after healing of the wound. Anaerobic inflammation is seen in 0.

[Altitude stress and the training of cosmonauts].

An ergonomic concept of the development of altitude stress is presented. According to this concept, the altitude stress as a psychophysiological response of man to the risk of falling from altitude is determined by the number and placement with respect to man position of antifalling contact supports and those being non-contact, i.e.

[Method of evaluating the functional activity of viral antigens].

A method for evaluation of the functional activity of viral antigens in their interaction with antibodies, has been developed. The proposed index of the functional activity is the quantitative characteristic of the neutralization process as a whole. The results obtained with this method correspond to those of the seroepidemiologic test: the diagnostic agents prepared from tick-borne encephalitis virus strains and clones, known as functionally active, showed greater activity in comparison with the reference strain.