Lack of CD24 expression in mice reduces the number of leukocytes in the colon.

Abstract:

:CD24 is an extensively glycosylated membrane protein that is linked to the membrane via a glycosyl-phosphatidylinositol (GPI)-anchor. In mice, CD24 is expressed by hematopoietic and non-hematopoietic cells. CD24-/- mice do not have gross immunological defects, but detailed analysis revealed strongly reduced responses in an experimental autoimmune encephalomyelitis (EAE) model and a massive proliferation of T cells under lymphopenic conditions. It was also demonstrated that preB cells from CD24-/- mice are impaired in α4-integrin-mediated cell binding. Here we report that CD24-/- mice have strongly reduced numbers of leukocytes in the colon compared to wildtype mice. The reduction comprized all subpopulations. Leukocyte counts in spleen, mesenteric lymph nodes or small intestine were not significantly different. We find that beside leukocytes, CD24 is widely expressed in EpCAM+ epithelial and CD31+ endothelial cells of colon and small intestine. However, in CD24-/- mice the number of CD31+ endothelial cells in colons was strongly reduced and the number of epithelial cells was augmented. Leukocyte transfer experiments provided evidence that the CD24 status of recipient mice, rather than of the transferred cells, is crucial for leukocyte recruitment to the colon. We hypothesize that CD24 on colonic epithelial and endothelial cells is required for the retention and positioning of leukocytes most likely by affecting integrin function.

journal_name

Immunol Lett

journal_title

Immunology letters

authors

Bretz NP,Salnikov AV,Doberstein K,Garbi N,Kloess V,Joumaa S,Naumov I,Boon L,Moldenhauer G,Arber N,Altevogt P

doi

10.1016/j.imlet.2014.06.004

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

140-8

issue

1

eissn

0165-2478

issn

1879-0542

pii

S0165-2478(14)00116-3

journal_volume

161

pub_type

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