title: Expression of HYAL2 mRNA, hyaluronan and hyaluronidase in B-cell non-Hodgkin lymphoma: relationship with tumor aggressiveness.
abstract: Hyaluronidases and their substrate, hyaluronan (HA), were mainly explored in solid tumors but rarely in hematologic malignancies. While HA involvement was demonstrated in invasion and metastasis in most cases of solid tumors, the role of hyaluronidases in cancer progression remains controversial. One of the hyaluronidases, HYAL2, is suspected to be involved in the first step of HA degradation. In this work, HYAL2 mRNA, HA and total hyaluronidases expression were examined in lymphoma tissue extracts and correlated to the lymphoma subtype. Real-time RT-PCR was performed to evaluate HYAL2 mRNA. HA and hyaluronidase were assayed by enzyme-linked sorbent assay. Our results showed that HYAL2 mRNA expression was correlated to lymphoma diagnosis (p = 6 x 10(-3)) and was significantly lower in high-grade lymphoma, i.e., diffuse large B-cell diffuse lymphomas (DLBCLs). Several forms of hyaluronidase were detected by zymography and total hyaluronidase activity detected in tissue extracts was not significantly different according to tumor grade. HA levels also correlated to lymphoma subtype (p = 1 x 10(-5)) and were higher in DLBCLs. Moreover, HYAL2 mRNA and HA expressions were inversely correlated (p = 0.035). HYAL2 gene is localized on chromosome 3p21, which contains candidates tumor suppressor genes. Our results suggest that HYAL2 may have a prognostic significance in lymphomas and an antioncogenic activity. Conversely, HA overexpression in high-grade lymphomas is in favor of its involvement in tumor development and could provide a useful target for lymphoma therapy using HA-binding peptides.
authors.affiliation: INSERM EMI 9906-IFR23, Molecular Biology Laboratory, Department of Hematology, Centre Henri-Becquerel, Rue d'Amiens, 76038 Rouen Cedex, France. pbertrand@rouen.fnclcc.fr
authors.forename: Philippe
authors.initials: P
authors.lastname: Bertrand
authors.forename: Marie-Noëlle
authors.initials: MN
authors.lastname: Courel
authors.forename: Catherine
authors.initials: C
authors.lastname: Maingonnat
authors.forename: Fabrice
authors.initials: F
authors.lastname: Jardin
authors.forename: Hervé
authors.initials: H
authors.lastname: Tilly
authors.forename: Christian
authors.initials: C
authors.lastname: Bastard
mesh_terms: D015815:Cell Adhesion Molecules / Q000096:biosynthesis*; D002893:Chromosomes, Human, Pair 3; D018450:Disease Progression; D058851:GPI-Linked Proteins; D020869:Gene Expression Profiling; D006801:Humans; D006820:Hyaluronic Acid / Q000096:biosynthesis*; D006821:Hyaluronoglucosaminidase / Q000096:biosynthesis*; D016393:Lymphoma, B-Cell / Q000235:genetics* / Q000473:pathology*; D011379:Prognosis; D012333:RNA, Messenger / Q000096:biosynthesis; D011991:Receptors, Virus; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D015815:Cell Adhesion Molecules; D058851:GPI-Linked Proteins; D012333:RNA, Messenger; D011991:Receptors, Virus; D006820:Hyaluronic Acid; C473096:Hyal2 protein, human; D006821:Hyaluronoglucosaminidase