Abstract:
:A recombinant human GM-CSF-EPO hybrid protein named MEN 11300 was administered biweekly for a total of 6 weeks to rhesus monkeys in order to evaluate its pharmacokinetic behaviour, tolerability and immunogenicity. In this primate species a strong antibody response was induced which neutralized the in vitro biological activity of human EPO while no antibody response could be detected against human GM-CSF. A severe drop in reticulocyte counts at approximately 2 weeks after initiation of treatment was followed by a dramatic decrease in the number of erythrocytes. No effects were observed on GM-CSF-dependent hematopoietic lineages and the clinical chemistry analyses did not reveal signs of general toxicity. Reticulocyte and erythrocyte counts started to recover 3-4 weeks after discontinuation of treatment in concert with a decline in anti-EPO antibody titres. Nevertheless, cell numbers remained below basal levels up to 50 days after the last MEN 11300 administration. Haematological impairment indicates that the administration to non-human primate of human EPO fused to human GM-CSF, induces neutralizing autoantibodies to the self EPO. Present data do not allow prediction of the immunogenic potential of the fusion protein in humans and a dose-escalating phase I study should be addressed to investigate the safety of the product.
journal_name
Cytokinejournal_title
Cytokineauthors
Coscarella A,Liddi R,Di Loreto M,Bach S,Faiella A,van der Meide PH,Mele A,De Santis Rdoi
10.1006/cyto.1998.0384keywords:
subject
Has Abstractpub_date
1998-12-01 00:00:00pages
964-9issue
12eissn
1043-4666issn
1096-0023pii
S1043-4666(98)90384-2journal_volume
10pub_type
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