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Abstract:

Attempts to achieve IgA responses in the intestine by oral immunization with non replicating antigens have been characterized by ineffective responses of short duration unless long term dosages are administered. Cholera toxin (CT) is an exception in that it is able to produce a high secretory and systemic immune response. We study the effects of a bacterial immunomodulator [3 x 1010 Propionibacterium granulosum ml-1 and lipopolysaccharide (LPS) 5 mg ml-1] on the immune response to CT orally administered to Wistar rats. The immunomodulator was orally administered as follows: in schedule 1 during 7 days prior to the first dose of CT; and in schedule 2, 2 days before, together, and 3 days after the first dose of CT. Schedules 1 and 2 were effective in increasing the specific IgA in the intestinal fluid and specific IgG in serum (P < 0.001) when compared to controls. Besides, schedule 2 was more effective than schedule 1 when the levels of specific IgG in serum or specific IgA in intestinal fluid was measured (P < 0.05). Total IgA in the intestinal fluid was increased in rats receiving the immunomodulator (P < 0.01). However, the ratio of specific IgA per total IgA was higher in rats receiving treatment 1 or 2 when compared to controls (P < 0.01). The number of antitoxin antibody producing cells was not increased in the Peyer patches, but a significant increase was observed in the mesenteric lymph nodes and spleen when compared to controls (P < 0.05). The administration of LPS alone produced an increase in the antitoxin immune response when compared to controls, but it was lower than those produced by the administration of the immunomodulator. These results indicate that this immunomodulator is an effective adjuvant of the mucosal and systemic immune response to CT. The mechanisms of action possibly involve nonespecific and specific modulations of the immune response.

Registro:

Documento: Artículo
Título:Oral administration of a bacterial immunomodulator enhances the immune response to cholera toxin
Autor:Fló, J.; Goldman, H.; Roux, M.E.; Massouh, E.
Filiación:Laboratory of Immunochemistry, Fac. of Exact and Natural Sciences, University of Buenos Aires, Buenos Aires 1428, Argentina
Natl. Cncl. of Tech./Sci. I., Buenos Aires, Argentina
Palabras clave:Bacterial immunomodulator; Cholera toxin; Immune response; cholera toxin; immunoglobulin A; immunomodulating agent; lipopolysaccharide; animal experiment; animal model; antibody response; article; cholera; controlled study; immunogenicity; immunomodulation; intestine mucosa; lung lavage; nonhuman; oral drug administration; Peyer patch; priority journal; rat
Año:1996
Volumen:14
Número:12
Página de inicio:1167
Página de fin:1173
DOI: http://dx.doi.org/10.1016/0264-410X(96)00019-9
Título revista:Vaccine
Título revista abreviado:VACCINE
ISSN:0264410X
CODEN:VACCD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0264410X_v14_n12_p1167_Flo

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Citas:

---------- APA ----------
Fló, J., Goldman, H., Roux, M.E. & Massouh, E. (1996) . Oral administration of a bacterial immunomodulator enhances the immune response to cholera toxin. Vaccine, 14(12), 1167-1173.
http://dx.doi.org/10.1016/0264-410X(96)00019-9
---------- CHICAGO ----------
Fló, J., Goldman, H., Roux, M.E., Massouh, E. "Oral administration of a bacterial immunomodulator enhances the immune response to cholera toxin" . Vaccine 14, no. 12 (1996) : 1167-1173.
http://dx.doi.org/10.1016/0264-410X(96)00019-9
---------- MLA ----------
Fló, J., Goldman, H., Roux, M.E., Massouh, E. "Oral administration of a bacterial immunomodulator enhances the immune response to cholera toxin" . Vaccine, vol. 14, no. 12, 1996, pp. 1167-1173.
http://dx.doi.org/10.1016/0264-410X(96)00019-9
---------- VANCOUVER ----------
Fló, J., Goldman, H., Roux, M.E., Massouh, E. Oral administration of a bacterial immunomodulator enhances the immune response to cholera toxin. VACCINE. 1996;14(12):1167-1173.
http://dx.doi.org/10.1016/0264-410X(96)00019-9