Streptococcus pneumoniae is a highly important respiratory pathogen that causes infections in children,
elderly people and immunocompromised people around the world. Pneumococcal vaccines licensed did
not reach to eradicate the pneumococcal infection. In a previous study was demonstrated the effectiveness
of a nasal experimental vaccine that consisted in a pneumococcal protective protein A (PppA)
co-administrated with heat-killed-Lactobacillus casei (LcM), in mice model of respiratory pneumococcal
challenge. In the present work the safety of the experimental vaccine LcM + PppA and its components
were evaluated through hematological, biochemical and immune parameters in a model infection with
S. pneumoniae. Thus, alanine transaminase activity, creatinine levels, lactate dehydrogenase activity, C
reactive protein levels, corticosterone levels in serum,total and differential leukocyte counts in blood and
bronchoalveolar lavages (BAL) and IgE in BAL, were evaluated. Experimental vaccine: LcM + PppA nasally
administered does not induce harmful effects in our vaccination–infection model. Studied parameters
showed LcM + PppA’s safety in liver, kidney, pulmonary and systemic levels. Although studies in experimental
animals do not guarantee security for the application ofthe vaccine on humans,they are important
evidence for the planning and subsequent clinical trials in humans
Streptococcus pneumoniae is a highly important respiratory pathogen that causes infections in children,elderly people and immunocompromised people around the world. Pneumococcal vaccines licensed didnot reach to eradicate the pneumococcal infection. In a previous study was demonstrated the effectivenessof a nasal experimental vaccine that consisted in a pneumococcal protective protein A (PppA)co-administrated with heat-killed-Lactobacillus casei (LcM), in mice model of respiratory pneumococcalchallenge. In the present work the safety of the experimental vaccine LcM + PppA and its componentswere evaluated through hematological, biochemical and immune parameters in a model infection withS. pneumoniae. Thus, alanine transaminase activity, creatinine levels, lactate dehydrogenase activity, Creactive protein levels, corticosterone levels in serum,total and differential leukocyte counts in blood andbronchoalveolar lavages (BAL) and IgE in BAL, were evaluated. Experimental vaccine: LcM + PppA nasallyadministered does not induce harmful effects in our vaccination–infection model. Studied parametersshowed LcM + PppA’s safety in liver, kidney, pulmonary and systemic levels. Although studies in experimentalanimals do not guarantee security for the application ofthe vaccine on humans,they are importantevidence for the planning and subsequent clinical trials in humans
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