title: Antisense inhibition of hyaluronan synthase-2 in human osteosarcoma cells inhibits hyaluronan retention and tumorigenicity.
abstract: Osteosarcoma is a common malignant bone tumor associated with childhood and adolescence. The results of numerous studies have suggested that hyaluronan plays an important role in regulating the aggressive behavior of various types of cancer cells. However, no studies have addressed hyaluronan with respect to osteosarcomas. In this investigation, the mRNA expression copy number of three mammalian hyaluronan synthases (HAS) was determined using competitive RT-PCR in the osteoblastic osteosarcoma cell line, MG-63. MG-63 are highly malignant osteosarcoma cells with an abundant hyaluronan-rich matrix. The results demonstrated that HAS-2 is the predominant HAS in MG-63. Accumulation of intracellular hyaluronan increased in association with the proliferative phase of these cells. The selective inhibition of HAS-2 mRNA in MG-63 cells by antisense phosphorothioate oligonucleotides resulted in reduced hyaluronan accumulation by these cells. As expected, the reduction in hyaluronan disrupted the assembly of cell-associated matrices. However, of most interest, coincident with the reduction in hyaluronan, there was a substantial decrease in cell proliferation, a decrease in cell motility and a decrease in cell invasiveness. These data suggest that hyaluronan synthesized by HAS-2 in MG-63 plays a crucial role in osteosarcoma cell proliferation, motility, and invasion.
authors.affiliation: Department of Orthopaedic Surgery, Nagoya University School of Medicine, 65 Tsurumai, Showa-ku, Nagoya 466-8550, Japan. ynishida@med.nagoya-u.ac.jp
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nishida
authors.forename: Warren
authors.initials: W
authors.lastname: Knudson
authors.forename: Cheryl B
authors.initials: CB
authors.lastname: Knudson
authors.forename: Naoki
authors.initials: N
authors.lastname: Ishiguro
mesh_terms: D001859:Bone Neoplasms / Q000737:chemistry* / Q000235:genetics / Q000473:pathology; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002633:Chemotaxis / Q000187:drug effects; D003094:Collagen / Q000187:drug effects; D004338:Drug Combinations; D018628:Gene Dosage; D014453:Glucuronosyltransferase / Q000037:antagonists & inhibitors* / Q000235:genetics; D006801:Humans; D000076002:Hyaluronan Synthases; D006820:Hyaluronic Acid / Q000096:biosynthesis / Q000378:metabolism*; D007700:Kinetics; D007797:Laminin / Q000187:drug effects; D016376:Oligonucleotides, Antisense / Q000494:pharmacology*; D012516:Osteosarcoma / Q000737:chemistry* / Q000235:genetics / Q000473:pathology; D011509:Proteoglycans / Q000187:drug effects; D012333:RNA, Messenger / Q000037:antagonists & inhibitors; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D004338:Drug Combinations; D007797:Laminin; D016376:Oligonucleotides, Antisense; D011509:Proteoglycans; D012333:RNA, Messenger; C059485:matrigel; D006820:Hyaluronic Acid; D003094:Collagen; D014453:Glucuronosyltransferase; D000076002:Hyaluronan Synthases