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Infection and Immunity, July 1999, p. 3504-3511, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Differential Roles of Segmented Filamentous Bacteria and Clostridia in Development of the Intestinal Immune System

Yoshinori Umesaki,1,* Hiromi Setoyama,1 Satoshi Matsumoto,1 Akemi Imaoka,1 and Kikuji Itoh2

Yakult Central Institute for Microbiological Research, Yaho 1796, Kunitachi-shi, Tokyo 186-8650,1 and Department of Veterinary Public Health, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657,2 Japan

Received 4 March 1999/Accepted 26 April 1999

The presence of microflora in the digestive tract promotes the development of the intestinal immune system. In this study, to evaluate the roles of two types of indigenous microbe, segmented filamentous bacteria (SFB) and clostridia, whose habitats are the small and large intestines, respectively, in this immunological development, we analyzed three kinds of gnotobiotic mice contaminated with SFB, clostridia, and both SFB and clostridia, respectively, in comparison with germfree (GF) or conventionalized (Cvd) mice associated with specific-pathogen-free flora. In the small intestine, the number of alpha beta T-cell receptor-bearing intraepithelial lymphocytes (alpha beta IEL) increased in SFB-associated mice (SFB-mice) but not in clostridium-associated mice (Clost-mice). There was no great difference in Vbeta usage among GF mice, Cvd mice, and these gnotobiotic mice, although the association with SFB decreased the proportion of Vbeta 6+ cells in CD8beta - subsets to some extent, compared to that in GF mice. The expression of major histocompatibility complex class II molecules on the epithelial cells was observed in SFB-mice but not in Clost-mice. On the other hand, in the large intestine, the ratio of the number of CD4- CD8+ cells to that of CD4+ CD8- cells in alpha beta IEL increased in Clost-mice but not in SFB-mice. On association with both SFB and clostridia, the numbers and phenotypes of IEL in the small and large intestines changed to become similar to those in Cvd mice. In particular, the ratio of the number of CD8alpha beta + cells to that of CD8alpha alpha + cells in alpha beta IEL, unusually elevated in the small intestines of SFB-mice, decreased to the level in Cvd mice on contamination with both SFB and clostridia. The number of immunoglobulin A (IgA)-producing cells in the lamina propria was more elevated in SFB-mice than in Clost-mice, not only in the ileum but also in the colon. The number of IgA-producing cells in the colons of Clost-mice was a little increased compared to that in GF mice. Taken together, SFB and clostridia promoted the development of both IEL and IgA-producing cells in the small intestine and that of only IEL in the large intestine, respectively, suggesting the occurrence of compartmentalization of the immunological responses to the indigenous bacteria between the small and large intestines.

* Corresponding author. Mailing address: Yakult Central Institute for Microbiological Research, Yaho 1796, Kunitachi-shi, Tokyo 186-8650, Japan. Phone: 81-42-577-8960. Fax: 81-42-577-3020. E-mail: hfg00420{at}nifty.ne.jp.

Infection and Immunity, July 1999, p. 3504-3511, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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