Flow cytometric analysis of age-related changes in intestine intraepithelial lymphocyte subsets and their functional preservation after feeding mice on spirulina.

Abstract:

:We investigated age-related changes in intestinal intraepithelial lymphocyte (IEL) subsets in mice by flow cytometric analysis and their functional preservation as affected by feeding Spirulina, a cyanobacterium that is known to possess various therapeutic effects, including immune modulation activity. The number of cells possessing the leukocyte-common antigen CD45(+) cells in mice (43 weeks old) of the aged group, used as a representative marker for IELs, was significantly lower than that of adult mice (5 weeks old). Either the proportion or the number of CD45(+)CD8(+) cells of the aged mice was significantly lower than that of adult mice, corresponding to previous reports. Proportions and numbers of CD4(+)CD8(+) cells in aged mice, on the other hand, were higher than those in adult mice. Increased or decreased levels of the cell surface antigens observed in the aged mice tended to be restored in aged mice fed Spirulina (aged-SP group), which ingested a hot water extract of Spirulina (SpHW). In fact, the proportions of CD45(+)CD8(+) cells and CD45(+)TCRgammadelta(+) cells in the aged-SP group significantly increased in comparison to the control aged group, which ingested ordinary chow and water ad libitum. These results suggest that ingestion of SpHW in the aged-SP group may contribute to the functional preservation of the intestinal epithelium as a first line of mucosal barrier against infectious agents through retaining the number of certain IELs. Changes in the number of other IEL subsets and blood cells are also discussed.

journal_name

J Med Food

authors

Hayashi O,Katayanagi Y,Ishii K,Kato T

doi

10.1089/jmf.2008.1260

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

982-9

issue

5

eissn

1096-620X

issn

1557-7600

journal_volume

12

pub_type

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