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Titolo:
Timing, localization, and persistence of colonization by segmented filamentous bacteria in the neonatal mouse gut depend on immune status of mothers and pups
Autore:
Jiang, HQ; Bos, NA; Cebra, JJ;
Indirizzi:
Univ Penn, Dept Biol, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 Dept Biol, Philadelphia, PA 19104 USA Univ Groningen, Dept Histol & Cell Biol, NL-9713 EZ Groningen, NetherlandsUniv Groningen Groningen Netherlands NL-9713 EZ Z Groningen, Netherlands
Titolo Testata:
INFECTION AND IMMUNITY
fascicolo: 6, volume: 69, anno: 2001,
pagine: 3611 - 3617
SICI:
0019-9567(200106)69:6<3611:TLAPOC>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
EPITHELIAL-CELLS; MATERNAL ANTIBODY; SMALL-INTESTINE; IGA RESPONSES; SUCKLING MICE; ATTACHMENT; INFECTION; SYSTEM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Cebra, JJ Univ Penn, Dept Biol, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 Philadelphia, PA 19104 USA
Citazione:
H.Q. Jiang et al., "Timing, localization, and persistence of colonization by segmented filamentous bacteria in the neonatal mouse gut depend on immune status of mothers and pups", INFEC IMMUN, 69(6), 2001, pp. 3611-3617

Abstract

As a member of the indigenous gut mucosal microbiota, segmented filamentous bacteria (SFB) colonize the guts of a variety of vertebrates and invertebrates. They are potent microbial stimuli of the gut mucosal immune system. In the small intestines of mice and rats, it has been observed that SFB areabsent during the suckling period and appear in high numbers shortly afterweaning, then quickly retreat to the cecum and large intestine. In this study, we explored whether this microecological phenomenon resulted from the interaction between SFB and the passively acquired maternal mucosal immunity and/or the actively acquired mucosal immunity. We set up a mouse model byreciprocal crossings and backcrossings of SFB-monoassociated, formerly germ-free, immunocompetent (+/+) BALB/c mice and immunodeficient (scid/scid) mice to produce pups which are either immunocompetent (scid/+) or immunodeficient (scid/scid) and are born either to immunocompetent (scid/+) mothers or to immunodeficient (scid/scid) mothers. We monitored the number of SFB onthe mucosa of the small intestine in the four different groups of mice after birth, as well as the level of passively acquired antibodies, the activegut mucosal immune responses, and immunoglobulin A (IgA) coating of SFB inthe gut. The results showed that, irrespective of whether the pups were scid/scid or scid/+, SFB could be found earlier on the mucosa of the small intestine in pups born to scid/scid mothers, appearing from day 13 and rapidly reaching a climax around weaning time on day 28, compared to the significantly delayed colonization in the pups of scid/+ mothers, starting from day16 and peaking around days 28 to 32, After the climax, SFB quickly declined to very low levels in the small intestines of scid/+ pups of either scid/scid mothers or scid/+ mothers, whereas they remained at high levels in scid/scid pups at least until day 70, the last observation time in this study,The dynamic changes in SFB colonization of the small intestines of the different groups of pups may be related to the dynamic changes in the levels of SFB coated,vith secretory IgA (sIgA), which resulted from the significantly different levels of sIgA obtained from the mothers' milk during the suckling period and, later, of self-produced sIgA in the small intestine. Nevertheless, it is evident that the timing, localization, and persistence of colonization of the neonatal gut by SFB depends on the immune status of both mothers and pups.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 15:22:01