Heparan sulfate proteoglycan, a component of endothelial cell membrane
s and extracellular matrices, is involved in a number of the critical
functions of endothelium and of antigen-presenting cells. This review
discusses bow heparan sulfate is released from endothelial cells durin
g inflammation, how the loss of heparan sulfate potentially alters end
othelial cell physiology, and bow the presence of heparan sulfate in a
soluble form might regulate the functioning of lymphocytes at sites o
f inflammation.