Special features of Pgp expression evaluation by flow cytometry were investigated. Indexes of interaction of FITC-conjugated Becton Dickinson Pharmingen monoclonal antibodies to external Pgp epitope (clone 17F9) were analyzed depending on the cell concentration (400000 to 3000000 cells/ml) and the specific antibody concentration (5, 10 and 20 μl of the market product solution per 300 μl of the cell suspension). Results. 1. Optimal condition of incubation with the antibodies was revealed - after the cell fixation in 4% formaldehyde. 2. Character of the increase of the cell fluorescence average intensity in the suspension totally according to the concentration of the Pgp-specific antibodies did not depend on the number of the cells. 3. Both the absolute value of the average intensity of the cell specific fluorescence as well as cell number out of the isotypic control fluorescence region depended on the ratio of the cell number to monoclonal antibody concentration. Conclusion. 1. It was shown that Pgp was practically expressed in all Jurkat cells. 2. By the Pgp expression level, the Jurkat cell culture was sufficiently homogeneous and stable in various passages. 3. Jurkat cells could be used as test culture in estimation of the market antibody activity. 4. For immunofluorescent assay of the Pgp expression in human tumor biopsy specimens, it is necessary to use not less than three concentrations of the specific antibodies, not less than three concentrations of the cells in the suspension as well as concurrent assay of the cell culture characterized previously. In particular, for investigated Pgp monoclonal antibodies, it is possible to use Jurkat cell culture. It allows revealing not only the fact of the Pgp expression but the level of the expression as well, i. e. to estimate severity of multidrug resistance phenotype.

Natural compounds showing considerable inhibitory effect on formation of biofilms by P.aeruginosa were selected. Synergism of the compounds with gentamicin with respect to both the inhibition of the biofilm formation and the gentamicin antibacterial effect was stated.

Antiviral activity of Panavir was studied in a model of experimental infection due to Morbillivirus in subcultures of cells Vero and B-16. It was shown that at multiplicity of the infection (0.001-0.0001 TCD₅₀/cell) Panavir inhibited reproduction of the virus in concentrations of 12-100 мcg/0.2 ml.

Two practically important antiviral agents, i. e. foscarnet (phosphonoformic acid, foscavir) and acyclovir, and their inhibitory effect on reproduction of human herpesvirus 6 (HHV-6) were investigated in an experiment with sensitive lymphoblastoic cell line HSB-2. Phosphonoformic acid (PFA) was shown advantageous vs. acyclovir. In a model of HHV-6 infection acyclovir was low active (chemotherapeutic index of 0.9) and its use in clinical practice is not useful, whereas PFA (chemoterapeutic index of 10) and similar agents showed significant antiviral activity that indicated the necessity of their further investigation.

Pharmacokinetic parameters of PAS-Akri coated tablets (Akrikhin, Russia) were investigated. The tablets contain paraaminosalicylic acid (PAS) as sodium dihydrate in an amount of 1000 mg. The single oral dose of the drug for healthy volunteers in the trial was 6, 9 or 12 tablets. In 7 days the dosage was changed. The blood samples were collected 0.25, 0.5, 0.75, 1, 2, 4, 6, 8 and 10 hours after the drug administration. The PAS serum levels were determined with HPLC. The trials will allow to optimize the dosing of PAS for providing efficient antituberculosis therapy.

Preclinical and clinical investigations of levofloxacin in complex with antituberculosis drugs of the main and reserve groups in 152 patients with newly diagnosticated drug resistant pulmonary tuberculosis demonstrated its efficacy and safety. The adverse events due to levofloxacin (8.6% of the cases) disappeared after discontinuation of the drug use without any affection of the patient's organs. Levofloxacin is applicable in antituberculosis therapy of patients with extended, acute progressing or polycavernous tuberculosis of the lungs. It provides significant clinical improvement and if necessary allows to prepare the patient in a short period for surgical operation.

Сlinісо-roentgenologlc and bacteriologic efficacy and safety of rifapex (rifapentin) were investigated in the complex therapy of 90 patients with newly recorded drug-susceptible tuberculosis. Pifapex was shown to be effective in the treatment of the patients during the acute phase of the disease, during the treatment completeness and during the short preoperative period.

One of the new experimental trends in pharmacotherapy of sepsis is the use of C1-esterase inhibitor (C1I) from the group of immunobiological agents influencing the complement system. An open prospective study on the safety and efficacy of C1I revealed its positive effect on the death rate among the patients with sepsis. In a dose of 12000 IU, C1I had a significant inhibitory action on the complement system activity, as well as an antiinflammatory effect by blocking the complement-dependent link in the systemic inflammation. The adverse and significant adverse events were not associated with the use of C1I.

The literature data on the structure and biological spectrum of sulfated polysaccharides (fucoidans) from the sea brown algae are presented. The review includes the data on the experimental studies and the results of the author's researches on the sulfated polysaccharides inhibitory action on virus adsorption on eukaryotic cells. Mechanisms of the antiviral action of the fucoidans from the sea brown algae are discussed.