RESUMO
Previous studies on the effect of the oral administration of bacterial immunomodulators (IM-104 and RN-301) during the protein free diet period, have shown an increase on B and T cell gut repopulation, accompanied by IgA antibody production. The usefulness of oral administration of the immunomodulator thymomodulin (TmB) during the protein refeeding period was investigated. TmB allowed the recovery of a normal repopulation of gut lamina propria with IgA B and CD5 T cells and decreases to control values the number of activated intraepithelial lymphocytes (CD25+T cell subset). Therefore, the oral administration of TmB may be useful as a therapeutic agent as it seems to improve the repopulation of intestinal villi with immunocompetent cells. Also, it seems to regulate the immunosurveillance at the epithelium level as it increases the CD5+T cells but decreases the activated ones.
Assuntos
Ratos , Feminino , Animais , Adjuvantes Imunológicos/uso terapêutico , Linfócitos B/efeitos dos fármacos , Imunoglobulina A/efeitos dos fármacos , Intestinos/efeitos dos fármacos , Deficiência de Proteína/tratamento farmacológico , Linfócitos T/efeitos dos fármacos , Extratos do Timo/uso terapêutico , Adjuvantes Imunológicos , Análise de Variância , Linfócitos B/metabolismo , Caseínas , Imunoglobulina A/metabolismo , Intestinos/citologia , Deficiência de Proteína/metabolismo , Ratos Wistar , Linfócitos T/metabolismo , Extratos do TimoRESUMO
It has been previously demonstrated in Wistar rats that severe protein deprivation at weaning, even after refeeding with a 20 percent casein diet for 21 days, provokes alterations in IgA+ B cell and T cell populations from gut and GALT (gut associated lymphoid tissue) that are reverted by immunomodulator IM-104. In the present report, we investigated the influence of RN-301 (quite similar to IM-104) given by the oral or subcutaneous route during the protein deprivation period, in the seeding of BALT with IgA+ B and CD5+T cells. The immunomodulator RN-301 contains LPS from E. coli and membrane and ribosomal fractions of P. acne. Tissue sections of the lower respiratory tract were studied by immunohistochemistry. The immunomodulator RN-301 administered by the oral route favours the significant increase in the seeding of the BALT lamina propria with IGA+B and CD5+T cells (p < 0.001). However, the RN-301 given by the subcutaneous route does not favour the repopulation of the BALT lamina propria. The ribosomal fractions from P. acne associated with LPS from E. coli contained in the immunomodulator RN-301 administered by the oral route may rescue the small resting lymphocytes in the gut-associated lymphoid tissue (GALT). This event favours their proliferation and migration to the BALT.