Glycobiology Advance Access published online on December 17, 2002
Glycobiology, doi:10.1093/glycob/cwg029
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© 2002 Oxford University Press
ORIGINAL ARTICLES
1 Department of Biochemistry & Molecular Biology, and The Oklahoma Center for Medical Glycobiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73190 The clearance of hyaluronan (HA) and chondroitin sulfates from the circulating blood and lymph in the body is mediated by the membrane-bound HA Receptor for Endocytosis (HARE). Previously, we found that two HARE species of
Revised on November 6, 2002
Accepted on November 6, 2002
Purification and molecular identification of the human hyaluronan receptor for endocytosis (HARE)
2 Department of Pathology, St Joseph's Hospital, 69 Exchange St, St Paul, MN 55102
175 kDa and
300 kDa are abundant in the sinusoidal endothelial cells in rat liver, spleen, and lymph nodes (Zhou et al., J. Biol. Chem. 275, 37733-37741, 2000). In the present study, immuno-cytochemical analysis of human tissues showed a similar pattern with abundant expression of HARE in the sinusoidal endothelial cells of human liver, spleen, and lymph nodes. The two human HARE proteins were immunoaffinity purified from human spleen. Each protein was recognized in Western blots using several anti-rat HARE monoclonal antibodies, and was able to bind 125I-HA specifically. In non-reducing SDS-PAGE, these two human HARE species migrated at
190 kDa and
315 kDa; both proteins are
15 kDa larger than the corresponding rat HAREs, although the de-N-glycosylated core proteins are essentially the same mass. After reduction, the human 190 kDa HARE gave a single 196 kDa species, which was not seen in the
315 kDa HARE after reduction. The reduced
315 kDa HARE yielded two major proteins at
250 kDa and
220 kDa. We determined the sequence of the human 190 kDa HARE cDNA based on analysis of internal tryptic peptides, as well as RT-PCR and 5'RACE analyses using human spleen and lymph node cDNA libraries. The human gene that encodes HARE is on chromosome 12.
Key words: hyaluronan binding protein, hyaluronic acid, iso-receptors, receptor mediated endocytosis, recycling receptor.
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