scholarly journals Higher Cytokine and Opsonizing Antibody Production Induced by Bovine Serum Albumin (BSA)-Conjugated Tetrasaccharide Related to Streptococcus pneumoniae Type 3 Capsular Polysaccharide

2020 ◽  
Vol 11 ◽  
Author(s):  
Ekaterina A. Kurbatova ◽  
Nelli K. Akhmatova ◽  
Anton E. Zaytsev ◽  
Elina A. Akhmatova ◽  
Nadezhda B. Egorova ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Diagnostic Test ◽  
Bovine Serum ◽  
Capsular Polysaccharide ◽  
Binding Capacity ◽  
Immunological Study ◽  
Gm Csf ◽  
Test Systems ◽  
Type 3

A number of studies have demonstrated the limited efficacy of S. pneumoniae type 3 capsular polysaccharide (CP) in the 13-valent pneumococcal conjugate vaccine against serotype 3 invasive pneumococcal diseases and carriage. Synthetic oligosaccharides (OSs) may provide an alternative to CPs for development of novel conjugated pneumococcal vaccines and diagnostic test systems. A comparative immunological study of di–, tri–, and tetra–bovine serum albumin (BSA) conjugates was performed. All oligosaccharides conjugated with biotin and immobilized on streptavidin-coated plates stimulated production of IL-1α, IL-2, IL-4, IL-5, IL-10, IFNγ, IL-17A, and TNFα, but not IL-6 and GM-CSF in monocultured mice splenocytes. The tetrasaccharide–biotin conjugate stimulated the highest levels of IL-4, IL-5, IL-10, and IFNγ, which regulate expression of specific immunoglobulin isotypes. The tetra–BSA conjugate adjuvanted with aluminum hydroxide elicited high levels of IgM, IgG1, IgG2a, and IgG2b antibodies (Abs). Anti-CP-induced Abs could only be measured using the biotinylated tetrasaccharide. The tetrasaccharide ligand possessed the highest binding capacity for anti-OS and antibacterial IgG Abs in immune sera. Sera to the tetra–BSA conjugate promoted greater phagocytosis of bacteria by neutrophils and monocytes than the CRM197-CP-antisera. Sera of mice immunized with the tetra–BSA conjugate exhibited the highest titer of anti-CP IgG1 Abs compared with sera of mice inoculated with the same doses of di– and tri–BSA conjugates. Upon intraperitoneal challenge with lethal doses of S. pneumoniae type 3, the tri– and tetra–BSA conjugates protected mice more significantly than the di–BSA conjugate. Therefore, it may be concluded that the tetrasaccharide ligand is an optimal candidate for development of a semi-synthetic vaccine against S. pneumoniae type 3 and diagnostic test systems.

A Novel Approach to Magnetic Nanoadsorbents with High Binding Capacity for Bovine Serum Albumin

2007 ◽  
Vol 28 (3) ◽  
pp. 346-351 ◽  
Author(s):  
Yabin Sun ◽  
Xiaobin Ding ◽  
Zhaohui Zheng ◽  
Xu Cheng ◽  
Xinhua Hu ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Binding Capacity ◽  
High Binding ◽  
Novel Approach

scholarly journals Increased binding and defective migration across fibronectin of cycling hematopoietic progenitor cells

Blood ◽  
2002 ◽  
Vol 99 (6) ◽  
pp. 2023-2031 ◽  
Author(s):  
Olivier Giet ◽  
Dirk R. Van Bockstaele ◽  
Ivano Di Stefano ◽  
Sandra Huygen ◽  
Roland Greimers ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Progenitor Cells ◽  
Bovine Serum ◽  
Binding Capacity ◽  
Hematopoietic Progenitor Cells ◽  
Hematopoietic Progenitor ◽  
Cd34 Cells ◽  
And Migration

Abstract Engraftment of hematopoietic progenitor cells has been shown to decrease during cell cycle transit. We studied cell cycle–associated changes in adhesion and migration of mitotically activated cord blood CD34+ cells. Migration toward medium conditioned by the stromal-derived factor-1–producing cell line MS-5 was studied in bovine serum albumin– and fibronectin (Fn)–coated transwells. Migration was reduced in cycling CD34+ cells and long-term culture-initiating cells (LTC-ICs) compared with their noncycling counterparts across Fn but not across bovine serum albumin. Conversely, Fn binding was higher in cycling CD34+ cells and LTC-ICs compared with noncycling progenitor cells, while adhesion of both subsets to bovine serum albumin was undetectable. The contribution of α4 and α5 integrins in mediating adhesion and migration of activated CD34+ cells onto Fn was analyzed by neutralization experiments. While α4-mediated Fn binding decreased during G2/M, α5 integrin–mediated adhesion increased during transit from G0/G1 to S and G2/M phases. As for migration, the contribution of α4 integrin was similar in all phases, whereas α5-directed migration was lower in G2/M compared with G0/G1and S phases. Defective migration of cycling CD34+ cells was not due to differences in α5 integrin expression. In conclusion, chemotaxis across Fn is less efficient in cycling progenitor cells in correlation with an increased Fn binding capacity. In addition, α4 and α5 integrin functions are independently modulated during cell cycle transit.

Effect of Denaturating Agents on the Structural Alterations and Drug-Binding Capacity of Human and Bovine Serum Albumin

2012 ◽  
Vol 45 (7) ◽  
pp. 520-529 ◽  
Author(s):  
J. Równicka-Zubik ◽  
A. Sułkowska ◽  
M. Maciążek-Jurczyk ◽  
L. Sułkowski ◽  
W. W. Sułkowski
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Binding Capacity ◽  
Drug Binding ◽  
Structural Alterations

scholarly journals Synthesis and Preliminary Immunological Evaluation of a Pseudotetrasaccharide Related to a Repeating Unit of the Streptococcus pneumoniae Serotype 6A Capsular Polysaccharide

2021 ◽  
Vol 8 ◽  
Author(s):  
Elena V. Sukhova ◽  
Dmitry V. Yashunsky ◽  
Ekaterina A. Kurbatova ◽  
Elina A. Akhmatova ◽  
Yury E. Tsvetkov ◽  
...  
Keyword(s):  
Streptococcus Pneumoniae ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Capsular Polysaccharide ◽  
Capsular Polysaccharides ◽  
Immunological Evaluation

2-Aminoethyl glycoside of the pseudotetrasaccharide α-d-Glcp-(1→3)-α-l-Rhap-(1→3)-d-Rib-ol-(5-P-2)-α-d-Galp corresponding to a repeating unit of the Streptococcus pneumoniae type 6A capsular polysaccharide has been synthesized. A suitably protected pseudotrisaccharide α-d-Glcp-(1→3)-α-l-Rhap-(1→3)-d-Rib-ol with a free 5-OH group in the ribitol moiety and a 2-OH derivative of 2-trifluoroacetamidoethyl α-d-galactopyranoside have been efficiently prepared and then connected via a phosphate bridge using the hydrogen phosphonate procedure. Preliminary immunological evaluation of this pseudotetrasaccharide and the previously synthesized pseudotetrasaccharide corresponding to a repeating unit of the capsular polysaccharide of S. pneumoniae serotype 6B has shown that they contain epitopes specifically recognized by anti-serogroup 6 antibodies and are able to model well the corresponding capsular polysaccharides. Conjugates of the synthetic pseudotetrasaccharides with bovine serum albumin were shown to be immunogenic in mice.

scholarly journals SYNTHETIC CONJUGATED ANALOGUES OF CAPSULE POLYSACCHARIDES OF PNEUMOCOCCUS - AN INSTRUMENT FOR DETECTION OF POST-VACCINATION ANTIBODIES

2016 ◽  
pp. 54-60 ◽  
Author(s):  
E. A. Kurbatova ◽  
E. A. Akhmatova ◽  
N. K. Akhmatova ◽  
N. B. Egorova ◽  
N. E. Yastrebova ◽  
...  
Keyword(s):  
Streptococcus Pneumoniae ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Diagnostic Test ◽  
Bovine Serum ◽  
High Ability ◽  
Post Vaccination ◽  
Protein Carrier ◽  
Synthetic Oligosaccharides

Aim. Evaluation of the ability of capsule polysaccharides (CP) of Streptococcus pneumoniae serotype 3 and 14 and their synthetic structure analogues, conjugated with bovine serum albumin (BSA), to detect antibodies in post-vaccination sera of mice. Materials and methods. Oligosaccharides corresponding to one, one and a half and two repeating links of serotype 3 and 14 S. pneumoniae CP were synthesized, their conjugates with BSA were produced by squarate method as well. Ligand content per BSA molecule was controlled by MALDI-TOF spectrometry. Immune sera were obtained after 2 intraperi-toneal administrations to mice of glucoconjugates adsorbed on aluminum hydroxide or 13-valent pneumococcal conjugated vaccine. Determination of levels of post-vaccination class G antibodies and their sub-isotypes was carried out in EIA. Results. Immunization of mice with neoglucoconjugates resulted in formation of predominantly IgGl recognizing serotype 3 and 14 S. pneumoniae CP. IgGl in mice immunized with a 13-valent conjugated vaccine recognized serotype 3 S. pneumoniae CP, but detected serotype 14 S. pneumoniae CP weakly. All the conjugated synthetic oligosaccharides were characterized by a high ability to bind antibodies in blood of mice immunized with the polysaccharide conjugated vaccine. BSA-tetrasaccharide of serotype 3 S. pneumoniae and BSA-tetrasaccharide of serotype 14 S. pneumoniae were characterized by the highest ability to detect IgG 1 against CP. Conclusion. Synthetic oligosaccharides, conjugated with BSA protein-carrier, may be used to develop diagnostic test-systems for determination of antibodies in post-vaccination sera.

Improvement of an artificial test substrate technique for evaluation of em immunocytochemical labeling

1987 ◽  
Vol 45 ◽  
pp. 762-763
Author(s):  
G. D. Gagne ◽  
M. F. Miller
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Artificial Substrate ◽  
Chemical Fixation ◽  
As If

We recently described an artificial substrate system which could be used to optimize labeling parameters in EM immunocytochemistry (ICC). The system utilizes blocks of glutaraldehyde polymerized bovine serum albumin (BSA) into which an antigen is incorporated by a soaking procedure. The resulting antigen impregnated blocks can then be fixed and embedded as if they are pieces of tissue and the effects of fixation, embedding and other parameters on the ability of incorporated antigen to be immunocyto-chemically labeled can then be assessed. In developing this system further, we discovered that the BSA substrate can also be dried and then sectioned for immunolabeling with or without prior chemical fixation and without exposing the antigen to embedding reagents. The effects of fixation and embedding protocols can thus be evaluated separately.

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