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Actinobacillus pleuropneumoniae serotype 2—effects on the interferon- α production of porcine leukocytes in vivo and in vitro

Identifieur interne : 000360 ( Istex/Corpus ); précédent : 000359; suivant : 000361

Actinobacillus pleuropneumoniae serotype 2—effects on the interferon- α production of porcine leukocytes in vivo and in vitro

Auteurs : Eva Wattrang ; P. Wallgren ; Caroline Fossum

Source :

RBID : ISTEX:15FDA434633898272995DFA1C77BB5EA29AD2DCE

English descriptors

Abstract

Abstract: Effects of a bacterial infection on the IFN-α production in vivo and in vitro were studied in eight specific pathogen free pigs experimentally infected with Actinobacillus pleuropneumoniae. Clinically, the experimental infection was manifested as a febrile stage which lasted approximately one week and by signs of respiratory disease. The Aujeszky’s disease virus (ADV) induced IFN-α production, assessed in whole blood cultures, was increased for the infected pigs during the febrile stage. Potentiating effects on the IFN-α production could be transferred to cultures of purified peripheral blood mononuclear cells with sera collected from the infected pigs during this period of time. Although the experimental infection with A. pleuropneumoniae did not induce any detectable amounts of IFN-α in serum or nasal secretion, both a phenol-extract and a heat-inactivated preparation of the bacteria induced low levels of IFN-α in cultures of purified PBMC. The interferogenic structures of the bacteria were not identified but there were indications that the bacteria induced IFN-α production in the same cell type as ADV.
Résumé: Huit porcs exemptsd’organismes pathogènes spécifiques et infectés expérimentalement par Actinobacillus pleuropneumoniae, on étéutilisés dans le butd’étudier les effetsd’une infection bactérienne sur la productiond’IFN-α in vivo et in vitro. Les effets cliniques del’infection expérimentale induent un état fébrile persistant environ une semaine ainsi que des symptômes respiratoires. La productiond’IFN-α induite par le virus de la maladied’Aujeszky (ADV), déterminée àpartir de cultures de sang total, a étéaugmentée chez les animaux infectés, pendant la phase fébrile. L’effet potentialiseur del’infection bactérienne sur la productiond’IFN-α a pu être transféréàdes cultures de cellules mononuclées du sang périphérique par dessérumsd’animaux infectés collectés pendant cette phase fébrile. L’infection expérimentale par A. pleuropneumoniae n’a pas induit la production de quantitésd’IFN-αdétectables dans lesérum ou lessécrétions nasales. Un extrait phénolique bactérien ou une préparation bactérienne inactivée par la chaleur ont induit une faible productiond’IFN-α par des leucocytes purifiés du sang périphérique. Les structures interferogénes de la bacteria n’ont pas étéidentifiées, mais il semble que A. pleuropneumoniae a induit la productiond’IFN-α par lemême type cellulaire que ADV.

Url:
DOI: 10.1016/S0147-9571(97)00025-8

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ISTEX:15FDA434633898272995DFA1C77BB5EA29AD2DCE

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<note type="content">Fig. 1: (A) Alterations in the total number of blood lymphocytes (rhombs) and PHA induced proliferation in cultures of purified PBMC (bars) recorded during the experimental period. The results are expressed as mean values (±SD) for the infected (solid symbols, n=8) and uninfected (open symbols, n=8) pigs. (B) Alterations in the total number of segmented neutrophils (rhombs) and luminol-enhanced chemiluminescence of purified blood PMNL (bars) recorded during the experimental period. The results are expressed as mean values (±SD) for the infected (solid symbols) and uninfected (open symbols) pigs. Cell counts were performed in both sets (n=8 vs 8) while chemiluminescence was performed only in set II (n=4 vs 4 with one missing value on days 0, 3 and 14). Significant differences between “treatment” (infected vs uninfected animal groups), as determined by the ANOVA test, are indicated in the figure: ∗=p<0.05; ∗∗=p<0.01; ∗∗∗=p<0.001. No significant effects of “treatment×set” were found.</note>
<note type="content">Fig. 2: (See facing page.) The ADV-induced IFN-α production (U/ml) in cultures of purified PBMC (A) and in cultures of whole blood (B) recorded during the experimental period and the effect of 10% sera from the experimental pigs on the IFN-α production of purified PBMC from a SPF pig, not included in the experiment (C). The results are expressed as mean values (+SD) for the infected (filled rhombs, n=8) and uninfected (open rhombs, n=8) pigs, in A and B. In C, the results are expressed as mean values (+SD) from cultures supplemented with sera sequentially collected during the experimental period (sera from infected pigs: solid rhombs; sera from uninfected pigs: open rhombs). For details see Materials and Methods. Significant differences between “treatment” (infected vs uninfected animal groups), as determined by the ANOVA test, are indicated in the figure: ∗=p<0.05; ∗∗=p<0.01; ∗∗∗=p<0.001. In addition a significant effect of “treatment×set” was found for cultures of purified PBMC (A) day 3 (p<0.05).</note>
<note type="content">Fig. 3: Proliferation (open squares; mean netcpm-values+SD) and IFN-α production (solid squares; individual values) of PBMC induced by the phenol-extract (A) and the heat-inactivated (B) preparations of A. pleuropneumoniae. The tests were carried out with PBMC isolated from blood of the pigs in set I, day 0 (n=8).</note>
<note type="content">Fig. 4: The effect of various concentrations of Con A on the proliferation (open squares) and IFN-α production (solid squares) induced by the heat-inactivated preparation of A. pleuropneumoniae in cultures of purified PBMC. Representative results from one out of eight pigs are shown.</note>
<note type="content">Table 1: The IFN-α response to ADV, the heat-inactivated preparation of A. pleuropneumoniae or the combination of the two, in the presence or absence of Con A</note>
<note type="content">Table 2: The IFN-α response to ADV and A. pleuropneumoniae, respectively among PBMC, PBMC depleted of adherent cells, and by PMNL</note>
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<p>Abstract: Effects of a bacterial infection on the IFN-α production in vivo and in vitro were studied in eight specific pathogen free pigs experimentally infected with Actinobacillus pleuropneumoniae. Clinically, the experimental infection was manifested as a febrile stage which lasted approximately one week and by signs of respiratory disease. The Aujeszky’s disease virus (ADV) induced IFN-α production, assessed in whole blood cultures, was increased for the infected pigs during the febrile stage. Potentiating effects on the IFN-α production could be transferred to cultures of purified peripheral blood mononuclear cells with sera collected from the infected pigs during this period of time. Although the experimental infection with A. pleuropneumoniae did not induce any detectable amounts of IFN-α in serum or nasal secretion, both a phenol-extract and a heat-inactivated preparation of the bacteria induced low levels of IFN-α in cultures of purified PBMC. The interferogenic structures of the bacteria were not identified but there were indications that the bacteria induced IFN-α production in the same cell type as ADV.</p>
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<p>Résumé: Huit porcs exemptsd’organismes pathogènes spécifiques et infectés expérimentalement par Actinobacillus pleuropneumoniae, on étéutilisés dans le butd’étudier les effetsd’une infection bactérienne sur la productiond’IFN-α in vivo et in vitro. Les effets cliniques del’infection expérimentale induent un état fébrile persistant environ une semaine ainsi que des symptômes respiratoires. La productiond’IFN-α induite par le virus de la maladied’Aujeszky (ADV), déterminée àpartir de cultures de sang total, a étéaugmentée chez les animaux infectés, pendant la phase fébrile. L’effet potentialiseur del’infection bactérienne sur la productiond’IFN-α a pu être transféréàdes cultures de cellules mononuclées du sang périphérique par dessérumsd’animaux infectés collectés pendant cette phase fébrile. L’infection expérimentale par A. pleuropneumoniae n’a pas induit la production de quantitésd’IFN-αdétectables dans lesérum ou lessécrétions nasales. Un extrait phénolique bactérien ou une préparation bactérienne inactivée par la chaleur ont induit une faible productiond’IFN-α par des leucocytes purifiés du sang périphérique. Les structures interferogénes de la bacteria n’ont pas étéidentifiées, mais il semble que A. pleuropneumoniae a induit la productiond’IFN-α par lemême type cellulaire que ADV.</p>
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serotype 2—effects on the interferon-
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<ce:italic>in vivo</ce:italic>
and
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<ce:simple-para>Huit porcs exempts
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d’organismes pathogènes spécifiques et infectés expérimentalement par
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d’étudier les effets
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d’une infection bactérienne sur la production
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d’IFN-
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. Les effets cliniques de
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l’infection expérimentale induent un état fébrile persistant environ une semaine ainsi que des symptômes respiratoires. La production
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d’IFN-
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d’Aujeszky (ADV), déterminée àpartir de cultures de sang total, a étéaugmentée chez les animaux infectés, pendant la phase fébrile. L’effet potentialiseur de
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l’infection bactérienne sur la production
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d’IFN-
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a pu être transféréàdes cultures de cellules mononuclées du sang périphérique par des
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sérums
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<abstract lang="en">Abstract: Effects of a bacterial infection on the IFN-α production in vivo and in vitro were studied in eight specific pathogen free pigs experimentally infected with Actinobacillus pleuropneumoniae. Clinically, the experimental infection was manifested as a febrile stage which lasted approximately one week and by signs of respiratory disease. The Aujeszky’s disease virus (ADV) induced IFN-α production, assessed in whole blood cultures, was increased for the infected pigs during the febrile stage. Potentiating effects on the IFN-α production could be transferred to cultures of purified peripheral blood mononuclear cells with sera collected from the infected pigs during this period of time. Although the experimental infection with A. pleuropneumoniae did not induce any detectable amounts of IFN-α in serum or nasal secretion, both a phenol-extract and a heat-inactivated preparation of the bacteria induced low levels of IFN-α in cultures of purified PBMC. The interferogenic structures of the bacteria were not identified but there were indications that the bacteria induced IFN-α production in the same cell type as ADV.</abstract>
<abstract lang="fr">Résumé: Huit porcs exemptsd’organismes pathogènes spécifiques et infectés expérimentalement par Actinobacillus pleuropneumoniae, on étéutilisés dans le butd’étudier les effetsd’une infection bactérienne sur la productiond’IFN-α in vivo et in vitro. Les effets cliniques del’infection expérimentale induent un état fébrile persistant environ une semaine ainsi que des symptômes respiratoires. La productiond’IFN-α induite par le virus de la maladied’Aujeszky (ADV), déterminée àpartir de cultures de sang total, a étéaugmentée chez les animaux infectés, pendant la phase fébrile. L’effet potentialiseur del’infection bactérienne sur la productiond’IFN-α a pu être transféréàdes cultures de cellules mononuclées du sang périphérique par dessérumsd’animaux infectés collectés pendant cette phase fébrile. L’infection expérimentale par A. pleuropneumoniae n’a pas induit la production de quantitésd’IFN-αdétectables dans lesérum ou lessécrétions nasales. Un extrait phénolique bactérien ou une préparation bactérienne inactivée par la chaleur ont induit une faible productiond’IFN-α par des leucocytes purifiés du sang périphérique. Les structures interferogénes de la bacteria n’ont pas étéidentifiées, mais il semble que A. pleuropneumoniae a induit la productiond’IFN-α par lemême type cellulaire que ADV.</abstract>
<note type="content">Fig. 1: (A) Alterations in the total number of blood lymphocytes (rhombs) and PHA induced proliferation in cultures of purified PBMC (bars) recorded during the experimental period. The results are expressed as mean values (±SD) for the infected (solid symbols, n=8) and uninfected (open symbols, n=8) pigs. (B) Alterations in the total number of segmented neutrophils (rhombs) and luminol-enhanced chemiluminescence of purified blood PMNL (bars) recorded during the experimental period. The results are expressed as mean values (±SD) for the infected (solid symbols) and uninfected (open symbols) pigs. Cell counts were performed in both sets (n=8 vs 8) while chemiluminescence was performed only in set II (n=4 vs 4 with one missing value on days 0, 3 and 14). Significant differences between “treatment” (infected vs uninfected animal groups), as determined by the ANOVA test, are indicated in the figure: ∗=p<0.05; ∗∗=p<0.01; ∗∗∗=p<0.001. No significant effects of “treatment×set” were found.</note>
<note type="content">Fig. 2: (See facing page.) The ADV-induced IFN-α production (U/ml) in cultures of purified PBMC (A) and in cultures of whole blood (B) recorded during the experimental period and the effect of 10% sera from the experimental pigs on the IFN-α production of purified PBMC from a SPF pig, not included in the experiment (C). The results are expressed as mean values (+SD) for the infected (filled rhombs, n=8) and uninfected (open rhombs, n=8) pigs, in A and B. In C, the results are expressed as mean values (+SD) from cultures supplemented with sera sequentially collected during the experimental period (sera from infected pigs: solid rhombs; sera from uninfected pigs: open rhombs). For details see Materials and Methods. Significant differences between “treatment” (infected vs uninfected animal groups), as determined by the ANOVA test, are indicated in the figure: ∗=p<0.05; ∗∗=p<0.01; ∗∗∗=p<0.001. In addition a significant effect of “treatment×set” was found for cultures of purified PBMC (A) day 3 (p<0.05).</note>
<note type="content">Fig. 3: Proliferation (open squares; mean netcpm-values+SD) and IFN-α production (solid squares; individual values) of PBMC induced by the phenol-extract (A) and the heat-inactivated (B) preparations of A. pleuropneumoniae. The tests were carried out with PBMC isolated from blood of the pigs in set I, day 0 (n=8).</note>
<note type="content">Fig. 4: The effect of various concentrations of Con A on the proliferation (open squares) and IFN-α production (solid squares) induced by the heat-inactivated preparation of A. pleuropneumoniae in cultures of purified PBMC. Representative results from one out of eight pigs are shown.</note>
<note type="content">Table 1: The IFN-α response to ADV, the heat-inactivated preparation of A. pleuropneumoniae or the combination of the two, in the presence or absence of Con A</note>
<note type="content">Table 2: The IFN-α response to ADV and A. pleuropneumoniae, respectively among PBMC, PBMC depleted of adherent cells, and by PMNL</note>
<subject>
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<topic>A. pleuropneumoniae</topic>
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