Larisa Chernousova - Academia.edu (original) (raw)
Papers by Larisa Chernousova
Tuberculosis and Lung Diseases
The objective: to perform intraspecific differentiation of M. abscessus strains isolated from pat... more The objective: to perform intraspecific differentiation of M. abscessus strains isolated from patients with pulmonary lesions using molecular genetic tests.Results. Intraspecific differentiation of 164 cultures of M. abscessus from 114 patients without cystic fibrosis showed that the subspecies M. abscessus subsp. dominated in the analysis set (90 of 114 patients; 78,95%), followed by M. abscessus subsp. massiliense (24/114; 21,05%). In 54 examined cystic fibrosis patients excreting non-tuberculous mycobacteria, M. abscessus was most often detected (41 patients out of 54; 75,93%). Intraspecific identification of the obtained M. abscessus isolates demonstrated the prevalence of the subspecies M. abscessus subsp. abscessus (29/41; 70,73%) over M. abscessus subsp. massiliense (11/41; 26,83%). In one case, a rare M. abscessus subsp. bolletii (1/41; 2,44%) was detected.
Genome announcements, Jan 27, 2015
We report here the draft genome sequence of Mycobacterium heckeshornense strain RLE isolated from... more We report here the draft genome sequence of Mycobacterium heckeshornense strain RLE isolated from a sputum sample from a patient with shortness of breath. This is the first draft genome sequence of M. heckeshornense.
International Journal of Molecular Sciences
A variety of ribo-, 2′-deoxyribo-, and 5′-norcarbocyclic derivatives of the 8-aza-7-deazahypoxant... more A variety of ribo-, 2′-deoxyribo-, and 5′-norcarbocyclic derivatives of the 8-aza-7-deazahypoxanthine fleximer scaffolds were designed, synthesized, and screened for antibacterial activity. Both chemical and chemoenzymatic methods of synthesis for the 8-aza-7-deazainosine fleximers were compared. In the case of the 8-aza-7-deazahypoxanthine fleximer, the transglycosylation reaction proceeded with the formation of side products. In the case of the protected fleximer base, 1-(4-benzyloxypyrimidin-5-yl)pyrazole, the reaction proceeded selectively with formation of only one product. However, both synthetic routes to realize the fleximer ribonucleoside (3) worked with equal efficiency. The new compounds, as well as some 8-aza-7-deazapurine nucleosides synthesized previously, were studied against Gram-positive and Gram-negative bacteria and M. tuberculosis. It was shown that 1-(β-D-ribofuranosyl)-4-(2-aminopyridin-3-yl)pyrazole (19) and 1-(2′,3′,4′-trihydroxycyclopent-1′-yl)-4-(pyrimidin-...
Bulletin of Experimental Biology and Medicine, 1994
Monoclonal antibodies toS. typhimurium K-antigens representing IgG1 immunoglobulins with a “kappa... more Monoclonal antibodies toS. typhimurium K-antigens representing IgG1 immunoglobulins with a “kappa”-type light chain are prepared and characterized. They are highly active in indirect enzyme immunoassay with purified K-antigens and whole fixedS. typhimurium cells and virtually do not cross-react with O-antigen of the same bacterial species or withE. coli antigenic structures. The kinetics of binding and ability to agglutinate whole bacterial cells are studied and epitope analysis is carried out, which shows that antigenic determinants ofS. typhimurium K-antigen qualitatively differ from those of O-antigen of the same bacterium.
Zhurnal mikrobiologii, epidemiologii, i immunobiologii, 1984
BMC Infectious Diseases, 2013
Background The Philippines has an extremely high rate of tuberculosis but little is known about M... more Background The Philippines has an extremely high rate of tuberculosis but little is known about M. tuberculosis genotypes and transmission dynamics in this country. The aim of this study was to determine the proportion of household contacts who develop active TB due to direct transmission from an index case in that household. Methods Mycobacterium tuberculosis isolates from household contacts of tuberculosis patients in the Philippines were characterized using restriction-fragment-length polymorphism analysis, spoligotyping, and mycobacterial interspersed repetitive units – variable number tandem repeats typing (12-loci) to determine their utility in elucidating transmission in an area of high tuberculosis prevalence. Drug susceptibility patterns for these isolates were also determined. Results Spoligotyping and MIRU-VNTR typing results matched in 10 (62.5%) of 16 index patient-household contact pairs while IS6110 fingerprints matched in only six (37.5%) pairs. Only 3/16 (18.8%) ind...
Doctor.Ru, 2021
Study Objective: to identify clinical and X-ray features of mycobacteriosis caused by slow-growin... more Study Objective: to identify clinical and X-ray features of mycobacteriosis caused by slow-growing forms of nontuberculous mycobacteria (NTMB), in patients with chronic non-specific lung diseases and TB. Study Design: prospective and retrospective study. Materials and Methods. We examined 166 patients with chronic lung diseases: bronchitis, obstructive respiratory diseases, bronchiectatic disease, and TB. 79 patients had a primary disease and nontuberculous mycobacteriosis (NTM); controls were 87 patients without NTM. The study included only patients with slow-growing forms of NTMB. Study Results. Analysis of the clinical presentations demonstrated that, when associated with chronic lung diseases, a mycobacterial infection did not cause severe aggravation of clinical symptoms of the disease, except for TB. All study groups showed identical X-ray symptoms: fibrous, focal infiltrative, cavity changes, and bronchictasia. Still, most often they were recorded in patients with NTM. Conclu...
Tuberculosis and non-tuberculous mycobacterial diseases, 2021
Zhurnal mikrobiologii, epidemiologii, i immunobiologii
To type Mycobacterium tuberculosis (MT) strains by the variable number of tandem repeats (VNTR), ... more To type Mycobacterium tuberculosis (MT) strains by the variable number of tandem repeats (VNTR), 136 MT cultures, isolated in 5 main general therapeutic laboratories and penitentiary antituberculosis institutions of the Samara region, were studied. Gene typing revealed that the greatest number of MT strains (73) belonged to VNTR type 42435. It was followed by VNTR type 22232, found in 13 isolated cultures. Among the MT cultures of the most widely spread VNTR type 42435, rifampicin-resistant strains prevailed (57 strains, i.e. 78%), while strains belonging to VNTR type 22232 were mainly sensitive to rifampicin (84%). VNTR typing of MT typing may be useful for epidemiological studies in the field of phthisiology.
Problemy tuberkuleza, 1994
Doklady Akademii nauk SSSR, 1978
Bulletin of Experimental Biology and Medicine, 1999
ABSTRACT Analysis of 90 clinical strains ofM. tuberculosis demonstrated the possibility of using ... more ABSTRACT Analysis of 90 clinical strains ofM. tuberculosis demonstrated the possibility of using allele-specific amplification for detecting mutations determining rifampicin resistance. Successive use of two allele-specific primers helped us to detect 85% resistant strains. Other strains were studied using conformation polymorphism analysis of single-stranded DNA fragments. Consecutive use of two assays correctly identified 98% resistant strains.
Bulletin of Experimental Biology and Medicine, 1979
Bulletin of Experimental Biology and Medicine, 1977
A method of obtaining antisera against isologous aggregated mouse immunoglobulins is described. T... more A method of obtaining antisera against isologous aggregated mouse immunoglobulins is described. This serum designated MAAS blocked in vitro the antigen-binding receptors of the immune rosette-forming cells. MAAS was injected to mice immunized with SRBC. In comparision with the immunized mice given normal isologous serum rosette-forming B-cells were absent in the spleen of mice given MAAS at the peak of isologous response. But the antibody-forming cell count was not decreased under the influence of MAAS.
Bulletin of Experimental Biology and Medicine, 1977
Isologous serum of CBA mice immunized with rabbit immunoglobulins (ARIS) contained a factor capab... more Isologous serum of CBA mice immunized with rabbit immunoglobulins (ARIS) contained a factor capable of inactivating rosette-forming splenocytes (RFC) in vitro from the same strain of mice immunized with SRBC. When mouse SRBC immunization was carried out against the background of ARIS injection the court of RFC to SRBC at the peak of immune response was 30% of that of mice injected with SRBC and normal isologous serum. A decrease of RFC count was the result of disappearance of the theta-negative RFC. Passive ARIS immunization failed to influence the antigen-induced proliferation of the antibody-forming cells and the synthesis of antibodies against SRBC.
Journal of Applied Microbiology
Aims The aim of this study was to develop a rapid PCR-based method for spoligotyping of Mycobacte... more Aims The aim of this study was to develop a rapid PCR-based method for spoligotyping of Mycobacteria in the microarray format and to compare it to conventional spoligotyping by hybridization. Methods and results The method employs the on-Chip PCR technique with primers specific for 43 spacers that separate direct repeats (DRs) in the DR region of mycobacterial DNA. The primers were immobilized on gel-based microarrays, and PCR was performed directly on the chips. The PCR fluorescence images were acquired and processed using a portable fluorescence analyzer equipped with dedicated software. Analysis takes 1.5–2 hours and can be carried out on clinical samples without additional handling. The analytical sensitivity of the method was 103 copies of target DNA. The spoligotyping results of 51 samples produced by the proposed method and by conventional reverse hybridization approach were in full concordance. Conclusions High throughput capacity, computerized data analysis, compact equipme...
Problemy tuberkuleza, 1996
Combined microbiological investigation of diagnostic material containing granular mycobacteria ha... more Combined microbiological investigation of diagnostic material containing granular mycobacteria has revealed cultures-revertants both in tuberculous and sarcoidosis patients. Identification of the isolated cultures provided the conclusion on identity of granular mycobacterial structures discovered both in tuberculous and sarcoidosis patients.
Nanoindustry Russia, 2015
Problemy tuberkuleza, 1996
Immunization of BALB/c mice with sonicates of M. smegmatis and kansasii and fusion of splenocytes... more Immunization of BALB/c mice with sonicates of M. smegmatis and kansasii and fusion of splenocytes of the immunized mice with cells of syngeneic myeloma P3X63Ag8653 yielded hybrid clones synthetizing antibodies to these antigens. The selection of hybrid clones and analysis of the antibodies specificity were performed at ELISA using the immunization antigens and antigens from other mycobacteria and E. coli. To define immunoglobulin class of the antibodies the authors used antiglobulin sera of class A, M, G. The monoclonal antibodies belonged to IgG. Molecular mass of polypeptides carrying the epitope against which the antibodies were directed was measured at immunoblotting. Two antibodies reacted only with M. smegmatis, 38 and 10 kD proteins. The other 2 cross-reacted with other mycobacteria and were directed against epitopes on polypeptides varying in molecular mass.
Zhurnal mikrobiologii, epidemiologii, i immunobiologii
To assess direct antimicrobial effect of complex of natural cytokines (CNC) and antimicrobial pep... more To assess direct antimicrobial effect of complex of natural cytokines (CNC) and antimicrobial peptides (Syperlymph preparation; CNC) on Mycobacterium tuberculosis H37Rv (H37Rv) and effect mediated by macrophages (MP) treated with the preparation. Direct effect of CNC was studied during cultivation of H37Rv in the presence of preparation, whereas indirect effects--during simultaneous cultivation of H37Rv and mice peritoneal MP C57B1/6. Assessment of growth was performed on the 7th day using PCR. It was shown that CNC directly inhibits growth of H37Rv in vitro. Cultivation of H37Rv in culture of MP resulted in inhibition of M. tuberculosis. The most evident inhibition was noted after extension of time of preliminary treatment of MP with Syperlymph and simultaneous increase of its concentration. Antimycobacterial effect of Syperlymph preparation related to complex effect of cytokines and antimicrobial peptides directed to M. tuberculosis and macrophages, which forms the conditions for ...
Tuberculosis and Lung Diseases
The objective: to perform intraspecific differentiation of M. abscessus strains isolated from pat... more The objective: to perform intraspecific differentiation of M. abscessus strains isolated from patients with pulmonary lesions using molecular genetic tests.Results. Intraspecific differentiation of 164 cultures of M. abscessus from 114 patients without cystic fibrosis showed that the subspecies M. abscessus subsp. dominated in the analysis set (90 of 114 patients; 78,95%), followed by M. abscessus subsp. massiliense (24/114; 21,05%). In 54 examined cystic fibrosis patients excreting non-tuberculous mycobacteria, M. abscessus was most often detected (41 patients out of 54; 75,93%). Intraspecific identification of the obtained M. abscessus isolates demonstrated the prevalence of the subspecies M. abscessus subsp. abscessus (29/41; 70,73%) over M. abscessus subsp. massiliense (11/41; 26,83%). In one case, a rare M. abscessus subsp. bolletii (1/41; 2,44%) was detected.
Genome announcements, Jan 27, 2015
We report here the draft genome sequence of Mycobacterium heckeshornense strain RLE isolated from... more We report here the draft genome sequence of Mycobacterium heckeshornense strain RLE isolated from a sputum sample from a patient with shortness of breath. This is the first draft genome sequence of M. heckeshornense.
International Journal of Molecular Sciences
A variety of ribo-, 2′-deoxyribo-, and 5′-norcarbocyclic derivatives of the 8-aza-7-deazahypoxant... more A variety of ribo-, 2′-deoxyribo-, and 5′-norcarbocyclic derivatives of the 8-aza-7-deazahypoxanthine fleximer scaffolds were designed, synthesized, and screened for antibacterial activity. Both chemical and chemoenzymatic methods of synthesis for the 8-aza-7-deazainosine fleximers were compared. In the case of the 8-aza-7-deazahypoxanthine fleximer, the transglycosylation reaction proceeded with the formation of side products. In the case of the protected fleximer base, 1-(4-benzyloxypyrimidin-5-yl)pyrazole, the reaction proceeded selectively with formation of only one product. However, both synthetic routes to realize the fleximer ribonucleoside (3) worked with equal efficiency. The new compounds, as well as some 8-aza-7-deazapurine nucleosides synthesized previously, were studied against Gram-positive and Gram-negative bacteria and M. tuberculosis. It was shown that 1-(β-D-ribofuranosyl)-4-(2-aminopyridin-3-yl)pyrazole (19) and 1-(2′,3′,4′-trihydroxycyclopent-1′-yl)-4-(pyrimidin-...
Bulletin of Experimental Biology and Medicine, 1994
Monoclonal antibodies toS. typhimurium K-antigens representing IgG1 immunoglobulins with a “kappa... more Monoclonal antibodies toS. typhimurium K-antigens representing IgG1 immunoglobulins with a “kappa”-type light chain are prepared and characterized. They are highly active in indirect enzyme immunoassay with purified K-antigens and whole fixedS. typhimurium cells and virtually do not cross-react with O-antigen of the same bacterial species or withE. coli antigenic structures. The kinetics of binding and ability to agglutinate whole bacterial cells are studied and epitope analysis is carried out, which shows that antigenic determinants ofS. typhimurium K-antigen qualitatively differ from those of O-antigen of the same bacterium.
Zhurnal mikrobiologii, epidemiologii, i immunobiologii, 1984
BMC Infectious Diseases, 2013
Background The Philippines has an extremely high rate of tuberculosis but little is known about M... more Background The Philippines has an extremely high rate of tuberculosis but little is known about M. tuberculosis genotypes and transmission dynamics in this country. The aim of this study was to determine the proportion of household contacts who develop active TB due to direct transmission from an index case in that household. Methods Mycobacterium tuberculosis isolates from household contacts of tuberculosis patients in the Philippines were characterized using restriction-fragment-length polymorphism analysis, spoligotyping, and mycobacterial interspersed repetitive units – variable number tandem repeats typing (12-loci) to determine their utility in elucidating transmission in an area of high tuberculosis prevalence. Drug susceptibility patterns for these isolates were also determined. Results Spoligotyping and MIRU-VNTR typing results matched in 10 (62.5%) of 16 index patient-household contact pairs while IS6110 fingerprints matched in only six (37.5%) pairs. Only 3/16 (18.8%) ind...
Doctor.Ru, 2021
Study Objective: to identify clinical and X-ray features of mycobacteriosis caused by slow-growin... more Study Objective: to identify clinical and X-ray features of mycobacteriosis caused by slow-growing forms of nontuberculous mycobacteria (NTMB), in patients with chronic non-specific lung diseases and TB. Study Design: prospective and retrospective study. Materials and Methods. We examined 166 patients with chronic lung diseases: bronchitis, obstructive respiratory diseases, bronchiectatic disease, and TB. 79 patients had a primary disease and nontuberculous mycobacteriosis (NTM); controls were 87 patients without NTM. The study included only patients with slow-growing forms of NTMB. Study Results. Analysis of the clinical presentations demonstrated that, when associated with chronic lung diseases, a mycobacterial infection did not cause severe aggravation of clinical symptoms of the disease, except for TB. All study groups showed identical X-ray symptoms: fibrous, focal infiltrative, cavity changes, and bronchictasia. Still, most often they were recorded in patients with NTM. Conclu...
Tuberculosis and non-tuberculous mycobacterial diseases, 2021
Zhurnal mikrobiologii, epidemiologii, i immunobiologii
To type Mycobacterium tuberculosis (MT) strains by the variable number of tandem repeats (VNTR), ... more To type Mycobacterium tuberculosis (MT) strains by the variable number of tandem repeats (VNTR), 136 MT cultures, isolated in 5 main general therapeutic laboratories and penitentiary antituberculosis institutions of the Samara region, were studied. Gene typing revealed that the greatest number of MT strains (73) belonged to VNTR type 42435. It was followed by VNTR type 22232, found in 13 isolated cultures. Among the MT cultures of the most widely spread VNTR type 42435, rifampicin-resistant strains prevailed (57 strains, i.e. 78%), while strains belonging to VNTR type 22232 were mainly sensitive to rifampicin (84%). VNTR typing of MT typing may be useful for epidemiological studies in the field of phthisiology.
Problemy tuberkuleza, 1994
Doklady Akademii nauk SSSR, 1978
Bulletin of Experimental Biology and Medicine, 1999
ABSTRACT Analysis of 90 clinical strains ofM. tuberculosis demonstrated the possibility of using ... more ABSTRACT Analysis of 90 clinical strains ofM. tuberculosis demonstrated the possibility of using allele-specific amplification for detecting mutations determining rifampicin resistance. Successive use of two allele-specific primers helped us to detect 85% resistant strains. Other strains were studied using conformation polymorphism analysis of single-stranded DNA fragments. Consecutive use of two assays correctly identified 98% resistant strains.
Bulletin of Experimental Biology and Medicine, 1979
Bulletin of Experimental Biology and Medicine, 1977
A method of obtaining antisera against isologous aggregated mouse immunoglobulins is described. T... more A method of obtaining antisera against isologous aggregated mouse immunoglobulins is described. This serum designated MAAS blocked in vitro the antigen-binding receptors of the immune rosette-forming cells. MAAS was injected to mice immunized with SRBC. In comparision with the immunized mice given normal isologous serum rosette-forming B-cells were absent in the spleen of mice given MAAS at the peak of isologous response. But the antibody-forming cell count was not decreased under the influence of MAAS.
Bulletin of Experimental Biology and Medicine, 1977
Isologous serum of CBA mice immunized with rabbit immunoglobulins (ARIS) contained a factor capab... more Isologous serum of CBA mice immunized with rabbit immunoglobulins (ARIS) contained a factor capable of inactivating rosette-forming splenocytes (RFC) in vitro from the same strain of mice immunized with SRBC. When mouse SRBC immunization was carried out against the background of ARIS injection the court of RFC to SRBC at the peak of immune response was 30% of that of mice injected with SRBC and normal isologous serum. A decrease of RFC count was the result of disappearance of the theta-negative RFC. Passive ARIS immunization failed to influence the antigen-induced proliferation of the antibody-forming cells and the synthesis of antibodies against SRBC.
Journal of Applied Microbiology
Aims The aim of this study was to develop a rapid PCR-based method for spoligotyping of Mycobacte... more Aims The aim of this study was to develop a rapid PCR-based method for spoligotyping of Mycobacteria in the microarray format and to compare it to conventional spoligotyping by hybridization. Methods and results The method employs the on-Chip PCR technique with primers specific for 43 spacers that separate direct repeats (DRs) in the DR region of mycobacterial DNA. The primers were immobilized on gel-based microarrays, and PCR was performed directly on the chips. The PCR fluorescence images were acquired and processed using a portable fluorescence analyzer equipped with dedicated software. Analysis takes 1.5–2 hours and can be carried out on clinical samples without additional handling. The analytical sensitivity of the method was 103 copies of target DNA. The spoligotyping results of 51 samples produced by the proposed method and by conventional reverse hybridization approach were in full concordance. Conclusions High throughput capacity, computerized data analysis, compact equipme...
Problemy tuberkuleza, 1996
Combined microbiological investigation of diagnostic material containing granular mycobacteria ha... more Combined microbiological investigation of diagnostic material containing granular mycobacteria has revealed cultures-revertants both in tuberculous and sarcoidosis patients. Identification of the isolated cultures provided the conclusion on identity of granular mycobacterial structures discovered both in tuberculous and sarcoidosis patients.
Nanoindustry Russia, 2015
Problemy tuberkuleza, 1996
Immunization of BALB/c mice with sonicates of M. smegmatis and kansasii and fusion of splenocytes... more Immunization of BALB/c mice with sonicates of M. smegmatis and kansasii and fusion of splenocytes of the immunized mice with cells of syngeneic myeloma P3X63Ag8653 yielded hybrid clones synthetizing antibodies to these antigens. The selection of hybrid clones and analysis of the antibodies specificity were performed at ELISA using the immunization antigens and antigens from other mycobacteria and E. coli. To define immunoglobulin class of the antibodies the authors used antiglobulin sera of class A, M, G. The monoclonal antibodies belonged to IgG. Molecular mass of polypeptides carrying the epitope against which the antibodies were directed was measured at immunoblotting. Two antibodies reacted only with M. smegmatis, 38 and 10 kD proteins. The other 2 cross-reacted with other mycobacteria and were directed against epitopes on polypeptides varying in molecular mass.
Zhurnal mikrobiologii, epidemiologii, i immunobiologii
To assess direct antimicrobial effect of complex of natural cytokines (CNC) and antimicrobial pep... more To assess direct antimicrobial effect of complex of natural cytokines (CNC) and antimicrobial peptides (Syperlymph preparation; CNC) on Mycobacterium tuberculosis H37Rv (H37Rv) and effect mediated by macrophages (MP) treated with the preparation. Direct effect of CNC was studied during cultivation of H37Rv in the presence of preparation, whereas indirect effects--during simultaneous cultivation of H37Rv and mice peritoneal MP C57B1/6. Assessment of growth was performed on the 7th day using PCR. It was shown that CNC directly inhibits growth of H37Rv in vitro. Cultivation of H37Rv in culture of MP resulted in inhibition of M. tuberculosis. The most evident inhibition was noted after extension of time of preliminary treatment of MP with Syperlymph and simultaneous increase of its concentration. Antimycobacterial effect of Syperlymph preparation related to complex effect of cytokines and antimicrobial peptides directed to M. tuberculosis and macrophages, which forms the conditions for ...