Expression of macrophage inflammatory protein-3 alpha, stromal cell-derived factor-1, and B-cell-attracting chemokine-1 identifies the tonsil crypt as an attractive site for B cells
M. Casamayor-palleja et al., Expression of macrophage inflammatory protein-3 alpha, stromal cell-derived factor-1, and B-cell-attracting chemokine-1 identifies the tonsil crypt as an attractive site for B cells, BLOOD, 97(12), 2001, pp. 3992-3994
The expression of 3 lymphoid chemokines - macrophage inflammatory protein-3
alpha (MIP-3 alpha), stromal cell-derived factor-1 (SDF-1), and B-cell-att
racting chemokine-1 (BCA-1) - in the tonsil and the possible correlation be
tween their sites of expression and B-cell localization within this tissue
were studied. The results show that all 3 chemokines are produced in the cr
ypts but differ by the nature of the cells that produce them and their loca
tion within the crypt, SDF-1 and MIP-3 alpha are produced by epithelial cel
ls, but their secretion is mutually exclusive. Both MIP-3 alpha- and SDF-1-
expressing cells are in close contact with memory B cells. By contrast, BCA
-l-producing cells in the crypt are not epithelial and form clusters coloca
lized with plasma cells, Altogether, these data suggest that the chemokines
produced in the tonsillar crypt may (1) attract memory B cells to antigen
and (2) recruit and retain plasma cells and memory B cells within the suppo
rtive epithelial microenvironment of the crypt.