Cytosine arabinoside increases the binding of 125I-labelled epidermal growth factor and 125I-transferrin and enhances the in vitro targeting of human tumour cells with anti-(growth factor receptor) mAb
Cytosine arabinoside increases the binding of 125I-labelled epidermal growth factor and 125I-transferrin and enhances the in vitro targeting of human tumour cells with anti-(growth factor receptor) mAb(370 views) Caraglia M, Tagliaferri P, Correale P, Genua G, Pinto A, Del Vecchio S, Esposito G, Bianco AR
Paper type: Journal Article
, Research Support, Non-U. S. Gov'T,
Impact factor: 4.293, 5-year impact factor: 3.661
Url: Not available.
Keywords: Adenocarcinoma Drug Therapy Metabolism
, Antibodies, Monoclonal Metabolism Therapeutic Use
, Cell Division Drug Effects
, Cytarabine Pharmacology
, Dose-Response Relationship, Epidermal Growth Factor Metabolism
, Erbb Receptors Biosynthesis Drug Effects Immunology
, Humans
, Immunotherapy
, Iodine Radioisotopes
, Kb Cells
, Lung Neoplasms Drug Therapy Metabolism
, Neoplasms Metabolism Therapy
, Radioimmunoassay
, Cell Surface Biosynthesis Drug Effects Immunology
, Transferrin Biosynthesis Drug Effects Immunology
, Time Factors
, Transferrin Metabolism
, Tumor Cells, Cultured
, Up-Regulation,
Affiliations: Cattedra di Oncologia Medica, Facolta di Medicina, Universita degli Studi Federico II di Napoli, Italy.
References: Not available.
Cytosine arabinoside increases the binding of 125I-labelled epidermal growth factor and 125I-transferrin and enhances the in vitro targeting of human tumour cells with anti-(growth factor receptor) mAb
We report that cytosine arabinoside (Ara-C), a cytosine analogue that at low doses causes phenotypical changes on human leukemia cells in vitro and in vivo, induces growth inhibition of oropharyngeal cancer KB and lung adenocarcinoma A549 cell lines. An increase in the number of epidermal growth factor and transferrin receptors (EGFR, TrfR) is induced by Ara-C on these cells. Maximal EGFR up-regulation occurs 96 h after the beginning of Ara-C exposure while maximal TrfR up-regulation is detected 24 h later. These effects occur without changes in the affinity of EGFR and TrfR for their ligands. Two classes of EGF-binding sites with a Kd of 0.055 nM and 2.3 nM respectively, and one class of transferrin-binding sites with a Kd of about 4 nM are detected on both untreated and Ara-C-treated KB cells. [3H]Thymidine uptake is clearly stimulated on KB cells by nanomolar concentrations of EGF and transferrin, whereas in Ara-C-treated cells [3H]thymidine uptake is not increased by EGF and transferrin under conditions where maximal EGFR and TrfR up-regulation occurs. The enhanced EGF and transferrin binding is paralleled by a twofold increase of in vitro targeting of Ara-C-treated KB and A549 cells with anti-EGFR 108.1 mAb and anti-TrfR OKT9 mAb. We propose that Ara-C could provide a new approach for the improvement of the therapeutic index of anti-EGFR and anti-TrfR immunoconjugates.
Cytosine arabinoside increases the binding of 125I-labelled epidermal growth factor and 125I-transferrin and enhances the in vitro targeting of human tumour cells with anti-(growth factor receptor) mAb
Cytosine arabinoside increases the binding of 125I-labelled epidermal growth factor and 125I-transferrin and enhances the in vitro targeting of human tumour cells with anti-(growth factor receptor) mAb
Bogdanovich S, Kim Y, Mizutani T, Yasuma R, Tudisco L, Cicatiello V, Bastos-carvalho A, Kerur N, Hirano Y, Baffi JZ, Tarallo V, Li S, Yasuma T, Arpitha P, Fowler BJ, Wright CB, Apicella I, Greco A, Brunetti A, Ruvo M, Sandomenico A, Nozaki M, Ijima R, Kaneko H, Ogura Y, Terasaki H, Ambati BK, Leusen JH, Langdon WY, Clark MR, Armour KL, Bruhns P, Verbeek JS, Gelfand BD, De Falco S, Ambati J * Human IgG1 antibodies suppress angiogenesis in a target-independent manner(670 views) Signal Transduct Target Ther (ISSN: 2059-3635print), 2016; 1: N/D-N/D. Impact Factor:0 ViewExport to BibTeXExport to EndNote