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Therapeutically effective dendritic cells generated by progenipoietin.(Brief Article)

Vaccine Weekly

| October 09, 2002 | COPYRIGHT 2002 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2002 OCT 9 - (NewsRx.com & NewsRx.net) -- by Maria G. Essig, MS, ELS, senior medical writer - Progenipoietin (ProGP-4) stimulated the proliferation of dendritic cells that have shown effectiveness against cancerous tumors, according to a report in the International Journal of Cancer.

The chimeric molecule progenipoietin (ProGP-4) is a dual receptor agonist for the human FMS-like tyrosine kinase 3 (Flt3) and granulocyte-colony stimulating factor (G-CSF) receptors. Pia Bjorck and colleagues at the University of Pittsburgh and Pharmacia treated BALB/c mice subcutaneously with ProGP-4 (40-100 microgram/day).

The investigators found that the numbers of CD11c+ dendritic cells (DCs) and CD11c-/CD11b+ granulocytes increased significantly in the spleen, blood, and lymph nodes of ProGP-4-treated animals, reaching a peak on the seventh day of treatment. Approximately 8% of splenocytes were CD11c+ DCs, of which almost half could endocytose and present the fluorescent DQ-BSA antigen.

BALB/c mice with 7-day CMS4 sarcomas received two injections (1 week apart) of a vaccine containing either CD11c+ DCs alone or CD11c+ DCs pulsed with a specific murine tumor antigen (murine p53[subscript]232-240). Although the DCs alone did not significantly affect the tumors, the peptide-pulsed DCs caused shrinkage or a reduction in ...

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