Autocrine stimulation of the Xmrk receptor tyrosine kinase in Xiphophorus melanoma cells and identification of a source for the physiological ligand
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- The melanoma·inducing gene of Xiphophorus fish encodes the Xmrk receptor tyrosine kinase. U sing a highly specific antiserum p~oduced against the recombinant receptor expressed with a baculovirus, it is shown that Xmrk is the most abundant phosphotyrosine protein in fish melanoma and thus highly activated in the tumors. Studies on a melanoma cellline revealed that these cells produce an activity that considerably stimulates receptor autophosphorylation. The stimulating activity induces receptor down-regulation and can be depleted from theThe melanoma·inducing gene of Xiphophorus fish encodes the Xmrk receptor tyrosine kinase. U sing a highly specific antiserum p~oduced against the recombinant receptor expressed with a baculovirus, it is shown that Xmrk is the most abundant phosphotyrosine protein in fish melanoma and thus highly activated in the tumors. Studies on a melanoma cellline revealed that these cells produce an activity that considerably stimulates receptor autophosphorylation. The stimulating activity induces receptor down-regulation and can be depleted from the melanoma cellsupernatant by the immobilized recombinant receptor protein. The fish melanoma cells can thus be considered autocrine tumor cells providing a source for future purification and characterization of the Xmrk ligand.…
Autor(en): | Barbara Malitschek, Joachim Wittbrodt, Petra Fischer, Reiner Lammers, Axel Ullrich, Manfred Schartl |
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URN: | urn:nbn:de:bvb:20-opus-61551 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Medizinische Fakultät / Theodor-Boveri-Institut für Biowissenschaften |
Fakultät für Biologie / Theodor-Boveri-Institut für Biowissenschaften | |
Sprache der Veröffentlichung: | Englisch |
Erscheinungsjahr: | 1994 |
Originalveröffentlichung / Quelle: | In: Journal of Biological Chemistry (1994) , 269, 14, 10423-10430 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Normierte Schlagworte (GND): | Physiologische Chemie |
Datum der Freischaltung: | 25.11.2011 |
Lizenz (Deutsch): | Deutsches Urheberrecht |