scholarly journals Immunization of Mice with Combinations of Pneumococcal Virulence Proteins Elicits Enhanced Protection against Challenge with Streptococcus pneumoniae

2000 ◽  
Vol 68 (5) ◽  
pp. 3028-3033 ◽  
Author(s):  
A. David Ogunniyi ◽  
Rebekah L. Folland ◽  
David E. Briles ◽  
Susan K. Hollingshead ◽  
James C. Paton
Keyword(s):  
Streptococcus Pneumoniae ◽  
Metal Binding ◽  
Protein A ◽  
Surface Protein ◽  
Active Immunization ◽  
Survival Times ◽  
Virulence Proteins ◽  
Virulent Type ◽  
Vaccine Potential ◽  
High Doses

ABSTRACT The vaccine potential of a combination of three pneumococcal virulence proteins was evaluated in an active-immunization–intraperitoneal-challenge model in BALB/c mice, using very high challenge doses of Streptococcus pneumoniae. The proteins evaluated were a genetic toxoid derivative of pneumolysin (PdB), pneumococcal surface protein A (PspA), and a 37-kDa metal-binding lipoprotein referred to as PsaA. Mice immunized with individual proteins or combinations thereof were challenged with high doses of virulent type 2 or type 4 pneumococci. The median survival times for mice immunized with combinations of proteins, particularly PdB and PspA, were significantly longer than those for mice immunized with any of the antigens alone. A similar effect was seen in a passive protection model. Thus, combinations of pneumococcal proteins may provide the best non-serotype-dependent protection against S. pneumoniae.

scholarly journals Protection against Streptococcus pneumoniae Elicited by Immunization with Pneumolysin and CbpA

2001 ◽  
Vol 69 (10) ◽  
pp. 5997-6003 ◽  
Author(s):  
Abiodun David Ogunniyi ◽  
Matthew C. Woodrow ◽  
Jan T. Poolman ◽  
James C. Paton
Keyword(s):  
Streptococcus Pneumoniae ◽  
Median Survival ◽  
Protein A ◽  
Active Immunization ◽  
Survival Times ◽  
Protein Antigens ◽  
Aluminium Phosphate ◽  
Associated Proteins ◽  
High Doses ◽  
The Individual

ABSTRACT The need for the development of cheap and effective vaccines against pneumococcal disease has necessitated the evaluation of common virulence-associated proteins of Streptococcus pneumoniae as potential vaccine antigens. In this study, we examined the capacity of active immunization with a genetic toxoid derivative of pneumolysin (PdB) and/or a fragment of choline binding protein A (CbpA; also known as PspC, Hic, and SpsA) to protect mice from intraperitoneal challenge with medium to very high doses of a highly virulent capsular type 2 pneumococcal strain, D39. The median survival times for mice immunized with the individual protein antigens in different adjuvant combinations were significantly longer than those for mice that received the respective adjuvants alone. Mice immunized with CbpA alone were significantly better protected than mice immunized with PdB alone. Correspondingly, the median survival times for mice that were immunized with a combination of PdB and CbpA were significantly longer than those for mice that received PdB alone but not significantly different from those that received CbpA alone. Mice immunized with the protein antigens in a mixture of monophospholipid A (MPL) and aluminium phosphate (AlPO4) adjuvants had higher antibody titers than mice that received the antigens in AlPO4 alone. Mice immunized with PdB in MPL plus AlPO4 were also significantly better protected than mice that received PdB in AlPO4 alone.

scholarly journals Contributions of Pneumolysin, Pneumococcal Surface Protein A (PspA), and PspC to Pathogenicity of Streptococcus pneumoniae D39 in a Mouse Model

2007 ◽  
Vol 75 (4) ◽  
pp. 1843-1851 ◽  
Author(s):  
Abiodun D. Ogunniyi ◽  
Kim S. LeMessurier ◽  
Rikki M. A. Graham ◽  
James M. Watt ◽  
David E. Briles ◽  
...  
Keyword(s):  
Streptococcus Pneumoniae ◽  
Systemic Disease ◽  
Protein A ◽  
Virulence Gene ◽  
Surface Protein ◽  
Invasive Disease ◽  
Upper Respiratory Tract ◽  
Virulence Proteins ◽  
Pneumococcal Surface Protein A ◽  
Genes Encoding

ABSTRACTSuccessful colonization of the upper respiratory tract byStreptococcus pneumoniaeis an essential first step in the pathogenesis of pneumococcal disease. However, the bacterial and host factors that provoke the progression from asymptomatic colonization to invasive disease are yet to be fully defined. In this study, we investigated the effects of single and combined mutations in genes encoding pneumolysin (Ply), pneumococcal surface protein A (PspA), and pneumococcal surface protein C (PspC, also known as choline-binding protein A) on the pathogenicity ofStreptococcus pneumoniaeserotype 2 (D39) in mice. Following intranasal challenge with D39, stable colonization of the nasopharynx was maintained over a 7-day period at a level of approximately 105bacteria per mouse. The abilities of the mutant deficient in PspA to colonize the nasopharynx and to cause lung infection and bacteremia were significantly reduced. Likewise, the PspC mutant and, to a lesser extent, the Ply mutant also had reduced abilities to colonize the nasopharynx. As expected, the double mutants colonized less well than the parent to various degrees and had difficulty translocating to the lungs and blood. A significant additive attenuation was observed for the double and triple mutants in pneumonia and systemic disease models. Surprisingly, the colonization profile of the derivative lacking all three proteins was similar to that of the wild type, indicating virulence gene compensation. These findings further demonstrate that the mechanism of pneumococcal pathogenesis is highly complex and multifactorial but ascribes a role for each of these virulence proteins, alone or in combination, in the process.

scholarly journals Streptococcus pneumoniae Surface Protein PcpA Elicits Protection against Lung Infection and Fatal Sepsis

2008 ◽  
Vol 76 (6) ◽  
pp. 2767-2776 ◽  
Author(s):  
David T. Glover ◽  
Susan K. Hollingshead ◽  
David E. Briles
Keyword(s):  
Streptococcus Pneumoniae ◽  
Protein A ◽  
Surface Protein ◽  
Murine Models ◽  
Wild Type ◽  
Survival Times ◽  
High Manganese ◽  
Subcutaneous Immunization ◽  
Fatal Sepsis ◽  
Manganese Concentrations

ABSTRACTPrevious studies have suggested that pneumococcal choline binding protein A (PcpA) is important for the full virulence ofStreptococcus pneumoniae, and its amino acid sequence suggests that it may play a role in cellular adherence. PcpA is under the control of a manganese-dependent regulator and is only expressed at low manganese concentrations, similar to those found in the blood and lungs. PcpA expression is repressed under high manganese concentrations, similar to those found in secretions. In this study, we have demonstrated that PcpA elicits statistically significant protection in murine models of pneumonia and sepsis. In the model of pneumonia with each of four challenge strains, statistically fewerS. pneumoniaecells were recovered from the lungs of mice immunized with PcpA and alum versus mice immunized with alum only. The immunizations reduced the median CFU by 4- to 400-fold (average of 28-fold). In the model of sepsis using strain TIGR4, PcpA expression resulted in shorter times to become moribund and subcutaneous immunization with PcpA increased survival times of mice infected with wild-type PcpA-expressing pneumococci.

scholarly journals DNA vaccines expressing pneumococcal surface protein A (PspA) elicit protection levels comparable to recombinant protein

2006 ◽  
Vol 55 (4) ◽  
pp. 375-378 ◽  
Author(s):  
Daniela M. Ferreira ◽  
Eliane N. Miyaji ◽  
Maria Leonor S. Oliveira ◽  
Michelle Darrieux ◽  
Ana Paula M. Arêas ◽  
...  
Keyword(s):  
Streptococcus Pneumoniae ◽  
Recombinant Protein ◽  
Dna Vaccines ◽  
Protein A ◽  
Surface Protein ◽  
Humoral Response ◽  
Cost Effective ◽  
Promising Candidate ◽  
Pneumococcal Surface Protein A ◽  
Antibody Levels

Pneumococcal surface protein A (PspA) is a promising candidate for the development of cost-effective vaccines against Streptococcus pneumoniae. In the present study, BALB/c mice were immunized with DNA vaccine vectors expressing the N-terminal region of PspA. Animals immunized with a vector expressing secreted PspA developed higher levels of antibody than mice immunized with the vector expressing the antigen in the cytosol. However, both immunogens elicited similar levels of protection against intraperitoneal challenge. Furthermore, immunization with exactly the same fragment in the form of a recombinant protein, with aluminium hydroxide as an adjuvant, elicited even higher antibody levels, but this increased humoral response did not correlate with enhanced protection. These results show that DNA vaccines expressing PspA are able to elicit protection levels comparable to recombinant protein, even though total anti-PspA IgG response is considerably lower.

scholarly journals Determination of phenotypes and pneumococcal surface protein A family types of Streptococcus pneumoniae from Malaysian healthy children

2013 ◽  
Vol 46 (3) ◽  
pp. 180-186 ◽  
Author(s):  
Masura Mohd Yatim ◽  
Siti Norbaya Masri ◽  
Mohd Nasir Mohd Desa ◽  
Niazlin Mohd Taib ◽  
Syafinaz Amin Nordin ◽  
...  
Keyword(s):  
Streptococcus Pneumoniae ◽  
Protein A ◽  
Surface Protein ◽  
Healthy Children ◽  
Pneumococcal Surface Protein A ◽  
Family Types
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