Translocation of active heparanase to cell surface regulates degradation of extracellular matrix heparan sulfate upon transmigration of mature monocyte-derived dendritic cells.
After Ag capture and exposure to danger stimuli, maturing dendritic cells (DCs) migrate to regional lymph nodes, where antigenic peptides are presented to T lymphocytes. To migrate from peripheral tissue such as the epidermis to regional lymph nodes, Ag-bearing epidermal Langerhans cells must move through an extracellular matrix (ECM) of various compositions. The nature of their capacity to transmigrate via ECM is not well understood, although MIP-3beta and CCR7 play critical roles. We were interested in verifying whether heparanase, a heparan sulfate-degrading endo-beta-d-glucuronidase that participates in ECM degradation and remodeling, is expressed and functional in monocyte-derived DCs. Using immunohistochemistry, confocal microscopy, RT-PCR, Western blot analysis, assays for heparanase activity, and Matrigel transmigration, we show that heparanase is expressed in both nuclei and cytoplasm of immature DCs, and that gene expression and synthesis take place mainly in monocytes and early immature DCs. We also found that both nuclear and cytoplasm fractions show heparanase activity, and upon LPS-induced maturation, heparanase translocates to the cell surface and degrades ECM heparan sulfate. Matrigel transmigration assays showed a MIP-3beta-comparable role for heparanase. Because heparan sulfate glycosaminoglycans play a key role in the self-assembly, insolubility, and barrier properties of the ECM, the results of this study suggest that heparanase is a key enzyme in DC transmigration through the ECM.
Benhamron
Sandrine
S
Laboratory for Cellular and Molecular Immunology, Bruce Rappaport Faculty of Medicine, Technion, Israel.
Nechushtan
Hovav
H
Verbovetski
Inna
I
Krispin
Alon
A
Abboud-Jarrous
Ghada
G
Zcharia
Eyal
E
Edovitsky
Evgeny
E
Nahari
Efrat
E
Peretz
Tamar
T
Vlodavsky
Israel
I
Mevorach
Dror
D
D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D002454:Cell Differentiation / Q000276:immunology; D002465:Cell Movement / Q000276:immunology*; D002467:Cell Nucleus / Q000201:enzymology; D003593:Cytoplasm / Q000201:enzymology; D003713:Dendritic Cells / Q000166:cytology / Q000201:enzymology*; D004728:Endothelium, Corneal / Q000166:cytology / Q000201:enzymology* / Q000276:immunology; D004789:Enzyme Activation; D005109:Extracellular Matrix / Q000201:enzymology / Q000378:metabolism*; D005966:Glucuronidase / Q000096:biosynthesis / Q000378:metabolism* / Q000502:physiology; D006497:Heparan Sulfate / Q000378:metabolism*; D006801:Humans; D007425:Intracellular Membranes / Q000201:enzymology; D008297:Male; D008565:Membrane Proteins / Q000502:physiology*; D008969:Molecular Sequence Data; D009000:Monocytes / Q000166:cytology / Q000201:enzymology*; D021381:Protein Transport / Q000276:immunology; D000099175:Heparanase
D005966:Glucuronidase; D006497:Heparan Sulfate; D008565:Membrane Proteins; D000099175:Heparanase