CYTOSINE-ARABINOSIDE INCREASES THE BINDING OF I-125 LABELED EPIDERMAL GROWTH-FACTOR AND I-125 TRANSFERRIN AND ENHANCES THE IN-VITRO TARGETING OF HUMAN TUMOR-CELLS WITH ANTI-(GROWTH FACTOR-RECEPTOR) MAB
CYTOSINE-ARABINOSIDE INCREASES THE BINDING OF I-125 LABELED EPIDERMAL GROWTH-FACTOR AND I-125 TRANSFERRIN AND ENHANCES THE IN-VITRO TARGETING OF HUMAN TUMOR-CELLS WITH ANTI-(GROWTH FACTOR-RECEPTOR) MAB(270 views visite) Caraglia M, Tagliaferri P, Correale P, Genua G, Pinto A, Del Vecchio S, Esposito G, Bianco AR
Cancer Immunol Immunother (ISSN: 0340-7004, 0340-7004linking), 1993 Sep; 37(3): 150-156.
Affiliations Affiliazioni: Cattedra di Oncologia Medica, Facolt di Medicina, Universit degli Studi 'Federico II' di Napoli, Via S. Pansini 5, Napoli, 80131, Italy Centro di Riferimento Oncologico, Aviano (PN), Italy Fondazione 'G. Pascale', Istituto Nazionale dei Tumori, Napoli, Italy
References Riferimenti: Not available. Non disponibili.
CYTOSINE-ARABINOSIDE INCREASES THE BINDING OF I-125 LABELED EPIDERMAL GROWTH-FACTOR AND I-125 TRANSFERRIN AND ENHANCES THE IN-VITRO TARGETING OF HUMAN TUMOR-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 K(d) of 0.055 nM and 2.3 nM respectively, and one class of transferrin-binding sites with a K(d) of about 4 nM are detected on both untreated and Ara-C-treated KB cells. [H-3]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 I-125 LABELED EPIDERMAL GROWTH-FACTOR AND I-125 TRANSFERRIN AND ENHANCES THE IN-VITRO TARGETING OF HUMAN TUMOR-CELLS WITH ANTI-(GROWTH FACTOR-RECEPTOR) MAB
CYTOSINE-ARABINOSIDE INCREASES THE BINDING OF I-125 LABELED EPIDERMAL GROWTH-FACTOR AND I-125 TRANSFERRIN AND ENHANCES THE IN-VITRO TARGETING OF HUMAN TUMOR-CELLS WITH ANTI-(GROWTH FACTOR-RECEPTOR) MAB
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