title: Heparin localization and fine structure regulate Burkitt's lymphoma growth.
abstract: Burkitt's lymphoma (BL) is a B-cell malignancy associated with the Epstein-Barr virus (EBV). Mounting evidence has implicated heparan sulfate proteoglycans and heparan sulfate-like glycosaminoglycans (HSGAGs) in the initiation, severity, and progression of the malignancy. The importance of HSGAGs in regulating BL cell growth was therefore examined. Extracellular exogenous heparin inhibited cell growth >30%, while heparin internalized with poly(beta-amino ester)s promoted proliferation up to 58%. The growth-modulating effects of heparin and internalized heparin were dependent on cell surface HSGAGs, PI3K, and Erk/Mek. Treatment of cells with protamine sulfate or with heparinases potently inhibited proliferation, with the greatest effects induced by heparinase I. Cell surface HSGAGs therefore play an important role in regulating BL proliferation and may offer a potential target for therapeutic intervention.
authors.affiliation: Harvard Medical School, Boston, MA 02215, USA.
authors.forename: David
authors.initials: D
authors.lastname: Berry
authors.forename: David M
authors.initials: DM
authors.lastname: Lynn
authors.forename: Eric
authors.initials: E
authors.lastname: Berry
authors.forename: Ram
authors.initials: R
authors.lastname: Sasisekharan
authors.forename: Robert
authors.initials: R
authors.lastname: Langer
mesh_terms: D002051:Burkitt Lymphoma / Q000737:chemistry* / Q000378:metabolism / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015536:Down-Regulation / Q000502:physiology; D006131:Growth Inhibitors / Q000494:pharmacology / Q000502:physiology*; D006493:Heparin / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology / Q000502:physiology*; D006801:Humans; D015854:Up-Regulation / Q000502:physiology
chemical_list: D006131:Growth Inhibitors; D006493:Heparin