title: Expression of attractin and its differential enzyme activity in glioma cells.
abstract: Attractin/mahogany protein was previously shown to be involved in a number of physiological and pathological events, including immune system regulation, body weight control, pigmentation, myelinization, and tumor susceptibility. Human attractin has an enzymatic activity resembling dipeptidyl peptidase IV (DPP-IV). In the central nervous system, attractin has been detected in neurons but not in glial cells up to now. We show the expression of attractin mRNA and protein in glioma cell lines at different degree of transformation. In human U373 and U87 glioma cells (Grades III and IV), membrane-bound attractin displays hydrolytic activity amounting to 5 and 25% of total cellular DPP-IV-like enzyme activity, respectively. Such activity has not been observed in the rat C6 glioma cells (Grade I). Attractin presence in glioma, but not in normal glial cells, together with its differential enzymatic activity, suggests its role in growth properties of tumors of glial cell origin.
authors.affiliation: Joint Laboratory of Cancer Cell Biology, First Department, First Faculty of Medicine, Katerinská 32, Prague 2, CZ-12108, Czech Republic.
authors.forename: R
authors.initials: R
authors.lastname: Malík
authors.forename: V
authors.initials: V
authors.lastname: Mares
authors.forename: Z
authors.initials: Z
authors.lastname: Kleibl
authors.forename: P
authors.initials: P
authors.lastname: Pohlreich
authors.forename: K
authors.initials: K
authors.lastname: Vlasicová
authors.forename: A
authors.initials: A
authors.lastname: Sedo
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000201:enzymology; D002850:Chromatography, Gel; D018076:DNA, Complementary / Q000235:genetics / Q000302:isolation & purification; D018819:Dipeptidyl Peptidase 4 / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004789:Enzyme Activation / Q000187:drug effects; D005910:Glioma / Q000737:chemistry / Q000201:enzymology*; D006023:Glycoproteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D006801:Humans; D007525:Isoelectric Focusing; D007527:Isoenzymes / Q000302:isolation & purification / Q000378:metabolism; D007930:Leucine / Q000031:analogs & derivatives / Q000494:pharmacology; D008970:Molecular Weight; D011480:Protease Inhibitors / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012689:Sequence Homology, Nucleic Acid; D013347:Subcellular Fractions / Q000201:enzymology; D013379:Substrate Specificity; D014407:Tumor Cells, Cultured
chemical_list: D018076:DNA, Complementary; D006023:Glycoproteins; D007527:Isoenzymes; D011480:Protease Inhibitors; D012333:RNA, Messenger; D018819:Dipeptidyl Peptidase 4; D007930:Leucine; C012211:ubenimex