Bacterial Imprinting of the Neonatal Immune System: Lessons From Maternal Cells?

• Autores: Perez, Pablo Fernando; Doré, Joel; Leclerc, Marion; Levenez, Florence; Benyacoub, Jalil; Serrant, Patrick; Segura Roggero, Iris; Schiffrin, Eduardo J.; Donnet Hughes, Anne
• Año de publicación: 2007
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Bacterial translocation; Breast milk; Immunity; Maternal and child health; Lactation
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

OBJECTIVE. We examined the presence of a natural bacterial inoculum in breast milk and its intracellular transport from the maternal intestine to the breast through the circulation. METHODS. Breast milk and peripheral blood were collected aseptically from healthy donors at various times after delivery, and the presence of viable bacteria was determined through plating. Temporal temperature gradient gel electrophoresis was used to examine the bacterial ribosomal DNA content in milk cells, maternal peripheral blood mononuclear cells, and feces and in corresponding infant feces. Blood from nongravid nonlactating women served as control samples. Bacterial translocation to extraintestinal tissues was also evaluated in virgin, pregnant, and lactating mice. RESULTS. Breast milk contained a low total concentration of microbes of <103 colony-forming units per mL. Temporal temperature gradient gel electrophoresis revealed that maternal blood and milk cells contained the genetic material of a greater biodiversity of enteric bacteria. Some bacterial signatures were common to infant feces and to samples of maternal origin. Bacterial translocation from the gut to mesenteric lymph nodes and mammary gland occurred during late pregnancy and lactation in mice. CONCLUSIONS. Bacterial translocation is a unique physiologic event, which is increased during pregnancy and lactation in rodents. Human breast milk cells contain a limited number of viable bacteria but a range of bacterial DNA signatures, as also found in maternal peripheral blood mononuclear cells. Those peripheral blood mononuclear cells showed greater biodiversity than did peripheral blood mononuclear cells from control women. Taken together, our results suggest that intestinally derived bacterial components are transported to the lactating breast within mononuclear cells. We speculate that this programs the neonatal immune system to recognize specific bacterial molecular patterns and to respond appropriately to pathogens and commensal organisms.
Fil: Perez, Pablo Fernando. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; Argentina
Fil: Doré, Joel. Nestlé Research Centre. Nestec; Francia
Fil: Leclerc, Marion. National Institute for Agronomic Research. Unit for Ecology and Physiology of the Digestive Tract; Francia
Fil: Levenez, Florence. National Institute for Agronomic Research. Unit for Ecology and Physiology of the Digestive Tract; Francia
Fil: Benyacoub, Jalil. Nestlé Research Centre. Nestec; Francia
Fil: Serrant, Patrick. Nestlé Research Centre. Nestec; Francia
Fil: Segura Roggero, Iris. Nestlé Research Centre. Nestec; Francia
Fil: Schiffrin, Eduardo J.. Nestlé Research Centre. Nestec; Francia
Fil: Donnet Hughes, Anne. Nestlé Research Centre. Nestec; Francia