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Immune responses to T-cell epitopes of SARS CoV-N protein are enhanced by N immunization with a chimera of lysosome-associated membrane protein

Identifieur interne : 000813 ( PascalFrancis/Curation ); précédent : 000812; suivant : 000814

Immune responses to T-cell epitopes of SARS CoV-N protein are enhanced by N immunization with a chimera of lysosome-associated membrane protein

Auteurs : K. Yang [États-Unis, République populaire de Chine] ; K. Sun [Singapour] ; K. N. Srinivasan [États-Unis, Singapour] ; J. Salmon [États-Unis] ; E. T. Marques [États-Unis] ; J. Xu [République populaire de Chine] ; J. T. August [États-Unis]

Source :

RBID : Pascal:09-0476528

Descripteurs français

English descriptors

Abstract

In our previous study by Gupta et al, dominant T-cell epitopes of SARS CoV-N(N) protein were predicted by software. The spectrum of interferon (IFN)-γ responses of Balb/c mice immunized against two different forms of SARS CoV-N plasmid was then analyzed. A cluster of dominant T-cell epitopes of SARS CoV-N protein was found in the N-terminus (amino acids 76-114). On the basis of this study, four different plasmids were constructed: (i) DNA encoding the unmodified N (p-N) or N70-122 (p-N70-122) as an endogenous cytoplasmic protein or (ii) DNA encoding a lysosome-associated membrane protein (LAMP) chimera with N (p-LAMP/N) or N70-122 (p-LAMP/N70-122). The immune responses of mice to these four constructs were evaluated. The results showed marked differences in the responses of the immunized mice. A single priming immunization with the p-LAMP/N construct was sufficient to elicit an antibody response. Enzyme-linked immunospot (ELISpot) assay indicated that p-LAMP/N70-122 and p-LAMP/N plasmids both elicited a greater IFN-γ response than p-N. p-N and p-N70-122 constructs induced low or undetectable levels of cytokine secretion. We also found that the p-LAMP/N70-122 construct promoted a long-lasting T-cell memory response without an additional boost 6 months after three immunizations. These findings show that DNA vaccines, even epitope-based DNA vaccines using LAMP as chimera, can elicit both humoral and cellular immune responses.
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C01 01    ENG  @0 In our previous study by Gupta et al, dominant T-cell epitopes of SARS CoV-N(N) protein were predicted by software. The spectrum of interferon (IFN)-γ responses of Balb/c mice immunized against two different forms of SARS CoV-N plasmid was then analyzed. A cluster of dominant T-cell epitopes of SARS CoV-N protein was found in the N-terminus (amino acids 76-114). On the basis of this study, four different plasmids were constructed: (i) DNA encoding the unmodified N (p-N) or N70-122 (p-N70-122) as an endogenous cytoplasmic protein or (ii) DNA encoding a lysosome-associated membrane protein (LAMP) chimera with N (p-LAMP/N) or N70-122 (p-LAMP/N70-122). The immune responses of mice to these four constructs were evaluated. The results showed marked differences in the responses of the immunized mice. A single priming immunization with the p-LAMP/N construct was sufficient to elicit an antibody response. Enzyme-linked immunospot (ELISpot) assay indicated that p-LAMP/N70-122 and p-LAMP/N plasmids both elicited a greater IFN-γ response than p-N. p-N and p-N70-122 constructs induced low or undetectable levels of cytokine secretion. We also found that the p-LAMP/N70-122 construct promoted a long-lasting T-cell memory response without an additional boost 6 months after three immunizations. These findings show that DNA vaccines, even epitope-based DNA vaccines using LAMP as chimera, can elicit both humoral and cellular immune responses.
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Pascal:09-0476528

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<div type="abstract" xml:lang="en">In our previous study by Gupta et al, dominant T-cell epitopes of SARS CoV-N(N) protein were predicted by software. The spectrum of interferon (IFN)-γ responses of Balb/c mice immunized against two different forms of SARS CoV-N plasmid was then analyzed. A cluster of dominant T-cell epitopes of SARS CoV-N protein was found in the N-terminus (amino acids 76-114). On the basis of this study, four different plasmids were constructed: (i) DNA encoding the unmodified N (p-N) or N
<sub>70-122</sub>
(p-N
<sub>70-122</sub>
) as an endogenous cytoplasmic protein or (ii) DNA encoding a lysosome-associated membrane protein (LAMP) chimera with N (p-LAMP/N) or N
<sub>70-122</sub>
(p-LAMP/N
<sub>70-122</sub>
). The immune responses of mice to these four constructs were evaluated. The results showed marked differences in the responses of the immunized mice. A single priming immunization with the p-LAMP/N construct was sufficient to elicit an antibody response. Enzyme-linked immunospot (ELISpot) assay indicated that p-LAMP/N
<sub>70-122</sub>
and p-LAMP/N plasmids both elicited a greater IFN-γ response than p-N. p-N and p-N
<sub>70-122</sub>
constructs induced low or undetectable levels of cytokine secretion. We also found that the p-LAMP/N
<sub>70-122</sub>
construct promoted a long-lasting T-cell memory response without an additional boost 6 months after three immunizations. These findings show that DNA vaccines, even epitope-based DNA vaccines using LAMP as chimera, can elicit both humoral and cellular immune responses.</div>
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<s1>XU (J.)</s1>
</fA11>
<fA11 i1="07" i2="1">
<s1>AUGUST (J. T.)</s1>
</fA11>
<fA14 i1="01">
<s1>Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine</s1>
<s2>Baltimore, MD</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>7 aut.</sZ>
</fA14>
<fA14 i1="02">
<s1>Department of Immunology, The Fourth Military Medical University</s1>
<s2>Xi'an, Shaanxi Province</s2>
<s3>CHN</s3>
<sZ>1 aut.</sZ>
</fA14>
<fA14 i1="03">
<s1>Division of Biomedical Sciences, Johns Hopkins in Singapore</s1>
<s3>SGP</s3>
<sZ>2 aut.</sZ>
</fA14>
<fA14 i1="04">
<s1>Product Evaluation and Registration Division, Centre for Drug Administration, Health Sciences Authority</s1>
<s3>SGP</s3>
<sZ>3 aut.</sZ>
</fA14>
<fA14 i1="05">
<s1>Division of Infectious Diseases, Department of Medicine, The Johns Hopkins University School of Medicine</s1>
<s2>Baltimore, MD</s2>
<s3>USA</s3>
<sZ>5 aut.</sZ>
</fA14>
<fA14 i1="06">
<s1>Department of Neurology, Tangdu Hospital, The Fourth Military Medical University</s1>
<s2>Xi'an, Shaanxi Province</s2>
<s3>CHN</s3>
<sZ>6 aut.</sZ>
</fA14>
<fA20>
<s1>1353-1362</s1>
</fA20>
<fA21>
<s1>2009</s1>
</fA21>
<fA23 i1="01">
<s0>ENG</s0>
</fA23>
<fA43 i1="01">
<s1>INIST</s1>
<s2>26274</s2>
<s5>354000170372360090</s5>
</fA43>
<fA44>
<s0>0000</s0>
<s1>© 2009 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45>
<s0>41 ref.</s0>
</fA45>
<fA47 i1="01" i2="1">
<s0>09-0476528</s0>
</fA47>
<fA60>
<s1>P</s1>
</fA60>
<fA61>
<s0>A</s0>
</fA61>
<fA64 i1="01" i2="1">
<s0>Gene therapy : (Basingstoke)</s0>
</fA64>
<fA66 i1="01">
<s0>GBR</s0>
</fA66>
<fC01 i1="01" l="ENG">
<s0>In our previous study by Gupta et al, dominant T-cell epitopes of SARS CoV-N(N) protein were predicted by software. The spectrum of interferon (IFN)-γ responses of Balb/c mice immunized against two different forms of SARS CoV-N plasmid was then analyzed. A cluster of dominant T-cell epitopes of SARS CoV-N protein was found in the N-terminus (amino acids 76-114). On the basis of this study, four different plasmids were constructed: (i) DNA encoding the unmodified N (p-N) or N
<sub>70-122</sub>
(p-N
<sub>70-122</sub>
) as an endogenous cytoplasmic protein or (ii) DNA encoding a lysosome-associated membrane protein (LAMP) chimera with N (p-LAMP/N) or N
<sub>70-122</sub>
(p-LAMP/N
<sub>70-122</sub>
). The immune responses of mice to these four constructs were evaluated. The results showed marked differences in the responses of the immunized mice. A single priming immunization with the p-LAMP/N construct was sufficient to elicit an antibody response. Enzyme-linked immunospot (ELISpot) assay indicated that p-LAMP/N
<sub>70-122</sub>
and p-LAMP/N plasmids both elicited a greater IFN-γ response than p-N. p-N and p-N
<sub>70-122</sub>
constructs induced low or undetectable levels of cytokine secretion. We also found that the p-LAMP/N
<sub>70-122</sub>
construct promoted a long-lasting T-cell memory response without an additional boost 6 months after three immunizations. These findings show that DNA vaccines, even epitope-based DNA vaccines using LAMP as chimera, can elicit both humoral and cellular immune responses.</s0>
</fC01>
<fC02 i1="01" i2="X">
<s0>002A31D01D</s0>
</fC02>
<fC02 i1="02" i2="X">
<s0>002B27D03</s0>
</fC02>
<fC02 i1="03" i2="X">
<s0>215</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE">
<s0>Réponse immune</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG">
<s0>Immune response</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA">
<s0>Respuesta inmune</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE">
<s0>Lymphocyte T</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG">
<s0>T-Lymphocyte</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA">
<s0>Linfocito T</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE">
<s0>Déterminant antigénique</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG">
<s0>Antigenic determinant</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA">
<s0>Determinante antigénico</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE">
<s0>Protéine membranaire</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG">
<s0>Membrane protein</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA">
<s0>Proteína membranar</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE">
<s0>Immunisation</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG">
<s0>Immunization</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA">
<s0>Inmunización</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE">
<s0>Chimère</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG">
<s0>Chimera</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA">
<s0>Quimera</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE">
<s0>Lysosome</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG">
<s0>Lysosome</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA">
<s0>Lisosoma</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE">
<s0>Lampe</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG">
<s0>Lamp</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA">
<s0>Lámpara</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE">
<s0>Vaccin génétique</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG">
<s0>Genetic vaccine</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA">
<s0>Vacuna genética</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE">
<s0>Thérapie génique</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG">
<s0>Gene therapy</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA">
<s0>Terapia génica</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE">
<s0>Virus syndrome respiratoire aigu sévère</s0>
<s2>NW</s2>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG">
<s0>Severe acute respiratory syndrome virus</s0>
<s2>NW</s2>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA">
<s0>Severe acute respiratory syndrome virus</s0>
<s2>NW</s2>
<s5>16</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE">
<s0>Coronavirus</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG">
<s0>Coronavirus</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA">
<s0>Coronavirus</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE">
<s0>Coronaviridae</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG">
<s0>Coronaviridae</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA">
<s0>Coronaviridae</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE">
<s0>Nidovirales</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="03" i2="X" l="ENG">
<s0>Nidovirales</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="03" i2="X" l="SPA">
<s0>Nidovirales</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="04" i2="X" l="FRE">
<s0>Virus</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="04" i2="X" l="ENG">
<s0>Virus</s0>
<s2>NW</s2>
</fC07>
<fC07 i1="04" i2="X" l="SPA">
<s0>Virus</s0>
<s2>NW</s2>
</fC07>
<fN21>
<s1>348</s1>
</fN21>
<fN44 i1="01">
<s1>OTO</s1>
</fN44>
<fN82>
<s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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   |wiki=    Sante
   |area=    SrasV1
   |flux=    PascalFrancis
   |étape=   Curation
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   |texte=   Immune responses to T-cell epitopes of SARS CoV-N protein are enhanced by N immunization with a chimera of lysosome-associated membrane protein
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