L (leukocyte)-selectin (CD62L) and CD44 are major adhesion receptors that support the rolling of leukocytes on endothelium, the first step of leukocyte entry into inflamed tissue. The specific contribution of L-selectin or CD44 to the regulation of cell traffic to joints in arthritis has not been investigated. We used CD44-deficient, L-selectin-deficient, and CD44/L-selectin double knockout mic...

Immunization by intramuscular injection of plasmid DNA expressing mycobacterial 65-kDa heat shock protein (hsp65) protects mice against challenge with virulent Mycobacterium tuberculosis H37Rv. During infection or after immunization, CD4+/CD8- and CD8+/CD4- hsp65-reactive T cells increased equally in spleens. During infection, the majority of these cells were weakly CD44 positive (CD44(lo)) and...

CD44 expression is elevated in basal-like breast cancer (BLBC) tissue, and correlates with increased efficiency of distant metastasis in patients and experimental models. We sought to characterize mechanisms underpinning CD44-promoted adhesion of BLBC cells to vascular endothelial monolayers and extracellular matrix (ECM) substrates. Stimulation with hyaluronan (HA), the native ligand for CD44,...

CD44 is involved in several biological processes owing to its dual role as a cell adhesion and signaling molecule. In an allogeneic dendritic cell (DC)-T cell interaction model, we show here that CD44 gets clustered at the contact between T cells with mature but not immature DCs. Also, CD44 colocalized with lipid rafts at the immunological synapse (IS). Using DCs or T cells derived from CD44-de...

BACKGROUND CD44 is a transmembrane receptor for the extracellular matrix glycosaminoglycan, hyaluronan. This receptor-ligand interaction plays an essential role in tumour progression, in embryonic tissue morphogenesis and in leukocyte migration during inflammation. It is well documented that the interaction between CD44 and hyaluronan is strictly regulated, but little is known about the relatio...

CD44 is a major cell surface receptor for the glycosaminoglycan hyaluronan (HA). Native high molecular weight hyaluronan (nHA) and oligosaccharides of hyaluronan (oHA) provoke distinct biological effects upon binding to CD44. Despite the importance of such interactions, however, the feature of binding with CD44 at the cell surface and the molecular basis for functional distinction between diffe...

Inflammation contributes to renal ischemia reperfusion (I/R) injury, potentially causing renal dysfunction. The inflammatory infiltrate mainly consists of neutrophils, which are deleterious for the renal tissue. Because CD44 is expressed by neutrophils and is rapidly upregulated by capillary endothelial cells after I/R injury, it was hypothesized that CD44 might play an important role in the de...

Adversities observed in treatment of children with neoplastic disease based on new diagnostic markers and new prognostic factors. Both of them allow prognosis to be established for a single patient. The aim of our study was to examine the expression of CD44 adhesion molecule in different histologic types in a neuroblastoma group of tumours (35 cases of neuroblastoma from current files and archi...

OBJECTIVE To identify early changes in vascular gene expression mediated by CD44 that promote atherosclerotic disease in apolipoprotein E (apoE)-deficient (apoE-/-) mice. METHODS AND RESULTS We demonstrate that CD44 is upregulated and functionally activated in aortic arch in the atherogenic environment of apoE-/- mice relative to wild-type (C57BL/6) controls. Moreover, CD44 activation even in...

The purpose of this study was to investigate how CD44 impaired Akt phosphorylation, EGR-1 expression and cell proliferation. E6.1 Jurkat cells, which lack endogenous CD44 expression, were engineered to express CD44. Previously we showed that Akt is hypophosphorylated, EGR-1 expression is reduced and proliferation is impaired in CD44 expressing E6.1 Jurkat cells. The cell cycle was studied using...