[Search for potential gastric cancer biomarkers using low molecular weight blood plasma proteome profiling by mass spectrometry].

Gastric cancer, one of the most widespread malignant tumors, still lacks reliable serum/plasma biomarkers of its early detection. In this study we have developed, unified, and tested a new methodology for search of gastric cancer biomarkers based on profiling of low molecular weight proteome (LMWP) (1-17 kDa). This approach included three main components: sample pre-fractionation, matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS), data analysis by a bioinformatics software package. Applicability and perspectives of the developed approach for detection of potential gastric cancer markers during LMWP analysis have been demonstrated using 69 plasma samples from patients with gastric cancer (stages I-IV) and 238 control samples. The study revealed peptides/polypeptides, which may be potentially used for detection of this pathology.

[Prostate cancer detection using mass-spectrometric profiling of low-molecular weight blood proteome].

Currently, there are no reliable biomarkers of blood plasma for early detection of prostate cancer (PC), a one of the most common malignancies in men. This study developed, universalized and tested a new standardized methodology of detection of prostate cancer biomarkers--profiling of low-molecular weight proteome of blood plasma (1-17 kDa). This approach includes three main components: a preliminary sample preparation, time-of-flight mass spectrometry with an matrix-assisted laser desorption/ionization ALDI-TOF-MS), and the processing of data using bioinformatics software package. The potentials and prospects of the approach developed for identification of potential PC markers are demonstrated. 46 samples of blood plasma of PC patients and 26 controls were screened. This evaluation identified peptides/polypeptides that have the potential to be used for the detection of disease.

[Production of active oxygen by neutrophils in patients with cancer of the esophagus and stomach before and after surgical interventions].

The state of the oxygen-depended antimicrobial activity of neutrophils on oncologic patients was studied. Production of active oxygen by non-activated and activated neutrophils of peripheral blood from 19 patients (the average age of 56 years, 16 males and 3 females) with esophageal cancer and cancer of the stomach and metastasis to the esophagus was recorded by chemiluminescence before and after surgical interventions (transpleural gastrectomy, Lewis type operation) on the 1st, 3rd and 7th days after the operations. The oxygen-depended antimicrobial activity of the neutrophils was investigated by their ability to produce active oxygen when incubated with opsonized zymosan and N-formyl-methionyl-leucyl-phenylalanine. Luminol chemiluminescence recorded the whole pool of active oxygen and showed the summary activity of myeloperoxidase and NADPH-oxidase, while luceginin chemiluminescence measured formation of superoxide anion radical (*O(-)2) and evaluated the activity of NADPH-oxidase. The results showed that the procedure provided estimation of the functional state of the neutrophil leukocytes and their ability to produce active oxygen. Impairment of the myeloperoxidase- and NADPH-depended production of active oxygen by non-activated and activated neutrophils observed before operations resulted in altered synthesis of active oxygen after the surgery. This is one of the leading factors of the infection development in the end. Detection of the myeloperoxidase- and NADPH-depended production of active oxygen could be of help in revealing the groups of risk among patients at the stage of the preoperative examination and serve as a prognostic factor of the development of severe infectious complications during the postoperative period.

[Study of bone tissue structure using polarized Raman spectra]. / Issledovanie stroeniia kostnoi tkani s pomoshch'iu poliarizovannykh spektrov kombinatsionnogo rasseianiia.

Polarized Raman spectra of bone tissue were obtained as well as of collagen fibres of the mouse tail tendon and oxyapatite crystals. It is shown that polarized Raman spectra permit to obtain information on spatial orientation of collagen fibres and oxyapatite microcrystals in various parts of the bone tissue. A laser Raman microprobe "Mole" was used to take Raman spectra measurements from the area of several square micrones. It is shown that in the diaphis osteon of human femur the collagen fibres and crystallographic axis C of oxyapatite crystals are directed along the long axis of the bone in the direction of the main mechanical loads on it.

[Determination of the carotenoid content of human blood plasma by light scattering]. / Opredelenie soderzhaniia karotinoidov v plazme krovi cheloveka po spektram kombinatsionnogo rasseianiia sveta.

Resonance combinational dispersion (RCD) of light was used for direct estimation of carotin in blood plasma without a previous extraction step. Intensity of RCD carotin lines in blood plasma correlated with that of standard beta-carotin solution in CCl4. Estimation of carotin concentration by means of RCD was compared with extraction-photometric procedure. The most suitable concentrations were 1.10(-5) = 1.10(-7) g/ml; 10 ml of blood plasma was sufficient for accurate measurements.