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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
1988 ; 106
(3
): 649-56
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Murine fetal liver macrophages bind developing erythroblasts by a divalent
cation-dependent hemagglutinin
#MMPMID2831233
Morris L
; Crocker PR
; Gordon S
J Cell Biol
1988[Mar]; 106
(3
): 649-56
PMID2831233
show ga
During mammalian development the fetal liver plays an important role in
hematopoiesis. Studies with the macrophage (M phi)-specific mAb F4/80 have
revealed an extensive network of M phi plasma membranes interspersed between
developing erythroid cells in fetal liver. To investigate the interactions
between erythroid cells and stromal M phi, we isolated hematopoietic cell
clusters from embryonic day-14 murine fetal liver by collagenase digestion and
adherence. Clusters of erythroid cells adhered to glass mainly via M phi, 94% of
which bound 19 +/- 11 erythroblasts (Eb) per cell. Bound Eb proliferated
vigorously on the surface of fetal liver M phi, with little evidence of
ingestion. The M phi could be stripped of their associated Eb and the clusters
then reconstituted by incubation with Eb in the presence of divalent cations. The
interaction required less Ca++ than Mg++, 100 vs. 250 microM for half-maximal
binding, and was mediated by a trypsin-sensitive hemagglutinin on the M phi
surface. After trypsin treatment fetal liver M phi recovered the ability to bind
Eb and this process could be selectively inhibited by cycloheximide. Inhibition
tests showed that the Eb receptor differs from known M phi plasma membrane
receptors and fetal liver M phi did not bind sheep erythrocytes, a ligand for a
distinct M phi hemagglutinin. We propose that fetal liver M phi interact with
developing erythroid cells by a novel nonphagocytic surface hemagglutinin which
is specific for a ligand found on Eb and not on mature red cells.