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Subtype a type 1 iv710 human immunodeficiency viral strain resistant to antiretroviral preparations for diagnostic and vaccine preparations. RU patent 2513692.

Subtype a type 1 iv710 human immunodeficiency viral strain resistant to antiretroviral preparations for diagnostic and vaccine preparations. RU patent 2513692.
IPC classes for russian patent Subtype a type 1 iv710 human immunodeficiency viral strain resistant to antiretroviral preparations for diagnostic and vaccine preparations. RU patent 2513692. (RU 2513692):

G01N33/569 -
C12N7/00 - Viruses, e.g. bacteriophages; Compositions thereof; Preparation or purification thereof (medicinal preparations containing viruses A61K0035760000; preparing medicinal viral antigen or antibody compositions, e.g. virus vaccines, A61K0039000000)
A61K35/76 - Viruses
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FIELD: medicine, pharmaceutics.

SUBSTANCE: invention refers to a subtype A human immunodeficiency viral strain, and can be used in virology, medicine and biotechnology. The presented type 1 IV710 human immunodeficiency viral strain is deposited in the State Collection of Viruses of Federal State Institution Ivanovsky Research Institution of Virology of the Ministry of Healthcare and Social Development of the Russian Federation, No. 1188. The strain possesses a stable reproductive activity. An infectious titre makes 3.5-4.0 lg 50% tissue cytopathic dose.

EFFECT: strain is a model for studying an antiviral activity of chemopreparations of new generation, as well as for creating vaccine preparations.

1 dwg, 4 tbl, 3 ex

 

The invention relates to the field of Virology and biotechnology and may be used for diagnostic and experimental vaccines.

With the advent of antiretroviral therapy (ARVs) to HIV-infection was not fatal, but a chronic disease. However, from 50 to 70% of patients receiving ARV therapy, not sensitive to the action of antiretroviral drugs [1]. Currently, an increasing number of reports about the emergence of new strains, resistant to antiretroviral drugs, despite attempts to prevent their occurrence [2]. One of the reasons of their appearance is suboptimal therapy with antiretroviral drugs, because HIV infection is characterized by extreme genetic divergentele viral populations. Variants of viruses are constantly evolving and are able to evade the immune response of the host, getting modified cell tropism and introducing drug-resistant variants. This heterogeneity of HIV-1 populations in the infected individual may be unevenly distributed in the body [3]. Currently, almost all the data on resistance strains of HIV-1 obtained on the subtype of virus circulating in the countries of Western Europe, North America and Australia [4]. Information on subtype a prevailing in most of the territory of the Russian Federation and the former Soviet republics [5, 6], in fact missing. In this regard, of particular importance for the study of chemotherapy drugs of new generation and creation of vaccines acquires the use of virus strains that belong to subtype, endemic to the territory of the Russian Federation.

The objective of the invention is getting strains of human immunodeficiency virus, belonging to the subtype a and resistant to antiviral chemotherapy class nucleoside analogues, non-nucleoside analogs and protease inhibitors, which is widely used in the treatment of HIV infection.

The technical result, which can be obtained by carrying out the invention, is to use it to study the antiviral action of chemotherapy drugs of new generation and to create a vaccine.

The strain of human immunodeficiency virus I-th type of YIWU 10 subtype a, resistant to antiretroviral drugs (ARVs)to diagnostic and vaccine is stored in the collection of viruses, NIELS them. After i.i.metchnikov RAMS and deposited in the State collection of viruses Petersburg research Institute of Virology them. Dieveniskes Ministry of Russia under 1188 from 16.01.12 and having the nucleotide sequence of the gene pol, shown in figure 1.

The strain of the virus isolated from peripheral blood lymphocytes of a patient with AIDS. Upon receipt of the strain used methods of cocultivation lymphocytes of a patient with blood lymphocytes of healthy donors, mitogen-stimulated, as well as with transplantable human cell lines.

Reproduction

The HIV-1 strain IV replicated in peripheral blood lymphocytes, as well as in continuous cell cultures MT-4 and Jurkat. The reproduction of the virus, characterized by cytopathic action and sinzitialnaya. The strain can be maintained for a long time at passirovannye on cell lines. After 5-6 days after infection of cells of vaccinated culture fluid infected cell suspension is frozen and after thawing and clarification at 1000 rpm is paid to fresh uninfected cells in the ratio 1:10.

The infectious titre of the virus was identified in 50% tissue cytopathic dose of the virus on the model of the above-mentioned cell cultures in comparison with the strain is similar to HIV-1 LAV, which is the first isolate HIV-1 isolated from a patient with AIDS [7]. Productive activity of the strain is 3,5-4,0 lg TCD (table 1). Lower infectious titre strain IF compared with the strain is similar because the strain LAV was isolated from a patient who did not receive ARV therapy.

Antigenic properties

HIV-1 belongs to the family Retroviridae, genus Lentivirus. Viruses of this subgroup are enveloped RNA viruses with a particle size of about 100-150 nm. Of particle find at least 6 major structural antigens with immunogenic properties that can be detected in infected cells using various immunological and virological methods.

Immunoflourescence. The study of the strain IF by the method of indirect immunofluorescence using the AIDS patient serum containing antibodies to HIV-1, showed the presence of antigen of HIV-1 in 30-35% of infected cells.

The immunoblot. A study in the immunoblot strain IV showed that the virus antigenic determinants characteristic of HIV-1: 120/160, 65, 55, 41,31, 24,17 KD (table 2).

Sublimirovanny. Genetic analysis of the region coded genome ro conducted using subtypisation primers (CCAAAGGTTAAACAATGG, TTAGATTCTTAAATGGCTCC), suitable for studying variants of HIV-1 circulating in Russia, showed that this strain of the virus belongs to the subtype A.

The opportunity of use of the invention is illustrated by examples that do not limit the scope and nature of the claims associated with them.

Example 1. A comparative study of infectious activity of strains of HIV-1 LAV and IV.

The study of infectious activity of HIV strains was performed on the model of lymphoblastoid cells MT-4 and Jurkat in plastic 24-hole panel (Costar, USA). Cells infected with the virus in a dose of 0,01 infectious units per cell. Then incubated cell culture at 37 C for 1 hour and double-laundered. After that the cell culture was added nutrient medium RPMI-1640 with 10% whey embryos cows (produced by Sigma) and 100 mcg/ml gentamicin (final concentration of cells 400,000 cells/ml). Records of the results of antiviral activity produced by cell viability by staining cells dye Tipanova blue on 6-7 day. The titre of the virus took the reciprocal of its maximum breeding, calling at least twice exceeding the rate of cell death compared with control. The research results are presented in Table 1.

It is established that the title of the strain YVES 710 is 3,5-4,0 lg TCD 50 (cytotoxic doses), which is quite high titer, given that the virus isolated from a patient receiving ARV therapy. This infectious titre allows to successfully infect lymphoblastoid cell culture with the aim of further developments of infectious material.

Example 2. Diagnosis of antibodies against proteins of HIV-1 using the Western blot test. The material for the study of antibodies to HIV-1 presents 8 sera obtained from HIV-infected persons and containing anti-HIV antibodies. Sera were previously described in commercial test-systems company "BioRad" (USA). As antigen strain used WILLOW 10 and strain-similar to HIV-1 LAV.

Detection of antibodies to HIV-1 was performed using nitrocellulose schipovnik membranes (strip) coated with the antigen of HIV-1 by "BioRad" (USA). Ready Stepovoy membrane pre-soak for 5 min in phosphate-buffered saline with tween (FSB-T). Serum in the amount of 20 ml dissolved in 1 ml of the FSB-T, containing 0.5% BSA (bovine serum albumin), and brought in well with the strip. After incubation for 1 hour at room temperature and cleaning of the FSB-T contributed conjugate, dissolved in 1 ml of the FSB is So Forth again were incubated for 1 hour at room temperature and after washing the FSB-T contributed 1 ml solution tetramethylbenzidine (TMB) in citrate-phosphate buffer (CPB (). Then incubated in the dark until a clear strips in the control strip. The reaction was stopped 1 N. sulfuric acid. After washing, the strip of distilled water was dried at room temperature and visually conducted analysis.

The research results are presented in Table 2. In research has established that the antigen strain IV allows to detect antibodies to all the major structural proteins of HIV-1 and, therefore, can be used to study seroconversion for HIV-1, as well as for the study of antiviral action the chemotherapy drugs and HIV vaccine.

Example 3. A study of resistance to chemotherapy class nucleoside, non-nucleoside analogs and protease inhibitors.

To verify the absence of antiviral drugs were taken azitotimidine and Epivir (nucleoside analogues, inhibiting the action of the reverse transcriptase inhibitor), viramune (a non-nucleoside analogue that inhibits the action of reverse transcriptase inhibitor) and Crixivan (protease inhibitor) in the maximum concentration of 20 mg/ml as a virus control was taken strain-similar to HIV-1 LAV. Antiviral effect of the drug was evaluated for viability of lymphoblastoid cells (table 3) and the level of virus antigen (P24) in cultural liquid (table 4). The study of antiviral drugs for HIV was carried out on models of lymphoblastoid cells MT-4 plastic 24-hole panel (Costar, USA). The cells were added to the study drug and infected by the virus in a dose of 0,01 infectious units per cell. Incubated cell culture at 37 C for 1 hour and double-laundered. After that the cell culture was added nutrient medium RPMI-1640 with 10% whey embryos cows (produced by Sigma) and 100 mcg/ml gentamicin (final concentration of cells 400,000 cells/ml). Next, change of environment was carried out in 2-3 days of cultivation. When changing environment of the old environment completely removed, the cells were washed with fresh environment RPMI-1640 without serum, then added fresh nutrient medium (final concentration of cells 400,000 cells/ml). Records of the results of antiviral activity produced by cell viability by staining cells dye Tipanova blue. Enzyme-linked immunosorbent assay using commercial ELISA kit firm BioRad (USA) carried out the antigen of the virus in culture fluid accordance with manufacturer's instructions. The results were taken into account using the photometer "Multiscan" at a wavelength of 630 nm.

Table 1

A comparative study of infectious activity of strains of HIV-1 LAV and IV on the model cells MT-4 and Jurkat

The title, lg TCD 50

Strains of HIV-1 (model cells MT-4)

Strains of HIV-1 (model Jurkat cells)

LAV IV LAV IV 6,0 3,5 6,0 4.0 Table 2

The study of the strain IF by the method of immunoblot

Strain

Identified antibodies

Control (LAV)

160 120 65 55 41 31 24 17 IV 160 120 65 55 41 31 24 17 Table 3

A comparative study of antiviral activity the chemotherapy drugs in the culture of lymphoblastoid cells infected with strains IV and LAV by cytopathic action

Control cells

Control of the virus (LAV)

IV

AZT 20 mg/ml

Viramune 20 mg/ml

Epivir 20 mg/ml

Crixivan 20 mg/ml

98 * 18 17 18 25 26

* - percentage of viable cells

Table 4

A comparative study of antiviral drugs in the culture of lymphoblastoid cells infected with strains IV and LAV enzyme-linked immunosorbent assay

Control cells

Control of the virus (LAV)

IV

AZT 20 mg/ml

Viramune 20 mg/ml

Epivir 20 mg/ml

Crixivan 20 mg/ml

0,098 * 1,988 1,393

KZT 1,394

1,399 1,331

* the optical density

Sources of information

1. Hirsch M.S., Gunthard H.F., Schapiro J.M et al. Antiretroviral drug resistance testing in adult HIV-1 infection: 2008 recommendations of an international AIDS society-USA panel // Clin. Infect. Dis. - 2008. - Vol.47. - P. 266-285.

2. Shafer R.W., Rhee S.Y., D.E. Bennett Consensus resistance mutations for epidemiological surveillance: basic principles and potential controversies // Antivir. Ther. - 2008. - Vol.13. - P. 59-68.

3. Choudhury Century, Pillay d, Taylor S. P. Analysis of HIV-1 variation in blood and semen during treatment and treatment interruption // J. Med. Virol. - 2002. - Vol.68. - P. 467-472.

4. Spira S., Wainberg M.A., Loemba H. et al. Impact of clade diversity on HIV-1 virulence, antiretroviral drug sensitivity and drug resistance // J. Antimicrob. Chem. - 2003. - V.51. - P. 229-240.

5. Bobkov A.F., Kazennova E.V., Selimova L.M. et al. Temporal trends in the HIV-1 epidemic in Russia: predominance of subtype A // J. Med. Virol. - 2004. - V.74. - P.191-196.

6. Nosik M., K. Ryzhov, Kravtchenko A. et al. Genotypic Analyses of HIV in antiretroviral drug-naive patients from Moscow and Moscow Region, Russia// 6th IAS Conference on HIV Pathogenesis, Treatment and Prevention, 17-20 July 2011, Rome, Italy, Abs.CDA002.

7. Barre-Sinoussi F, Mugeyre M., Dauguet C. Isolation of a T-lymphotropic retroviruses from a patient at risk for AIDS // Science. - 1983. - Vol.220. - P.868-871.

The strain of human immunodeficiency virus I-th type IV subtype a, resistant to antiretroviral drugs, diagnostics and vaccines that are deposited in the State collection of viruses Petersburg research Institute of Virology them. Dieveniskes Ministry of Russia under 1188 and having the nucleotide sequence of the gene pol, shown in figure 1.

 

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