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Poly(amidoamine) dendrimer-based nanodevice developed for cancer therapy
[November 24, 2005]

Poly(amidoamine) dendrimer-based nanodevice developed for cancer therapy

(Vaccine Weekly)
2005 NOV 30 - ( -- Scientists have developed a poly(amidoamine) dendrimer-based multifunctional engineered nanodevice for cancer therapy.

Investigators writing in the Journal of Medicinal Chemistry report, "Multifunctional cancer therapeutic nanodevices have been designed and synthesized using the poly(amidoamine) (PAMAM) dendrimer as a carrier."

"Partial acetylation of the generation 5 (G5) PAMAM dendrimer was utilized to neutralize a fraction of the primary amino groups, provide enhanced solubility of the dendrimer during the conjugation reaction of fluorescein isothiocyanate (FITC) (in dimethyl sulfoxide (DMSO)), and prevent nonspecific targeting interactions (in vitro and in vivo) during delivery."

"The remaining nonacetylated primary amino groups were utilized for conjugation of the functional molecules fluorescein isothiocyanate (FITC, an imaging agent), folic acid (FA, targets overexpressed folate receptors on specific cancer cells), and methotrexate (MTX, chemotherapeutic drug)," said Istvan J. Majoros and colleagues at the University of Michigan. "The appropriate control nanodevices have been synthesized as well. The G5 PAMAM dendrimer molecular weight and number of primary amino groups were determined by gel permeation chromatography (GPC) and potentiometric titration for stoichiometric design of ensuing conjugation reactions."

The researchers noted, "Additionally, dendrimer conjugates were characterized by multiple analytical methods including GPC, nuclear magnetic resonance spectroscopy (NMR), high performance liquid chromatography (HPLC), and UV spectroscopy."

"The fully characterized nanodevices can be used for the targeted delivery of chemotherapeutic and imaging agents to specific cancer cells. We present a more extensive investigation of our previously reported synthesis of this material with improvements directed toward scale-up synthesis and clinical trials," the authors stated.

Majoros and associates published their study in the Journal of Medicinal Chemistry (Poly(Amidoamine) dendrimer-based multifunctional engineered nanodevice for cancer therapy. J Med Chem, 2005;48(19):5892-5899).

Additional information can be obtained by contacting Istvan J. Majoros, Center for Biologic Nanotechnology, University of Michigan, 200 Zina Pitcher Place, 4027 Kresge II, Ann Arbor, Michigan 48109-0533, USA. E-mail: [email protected].

The publisher of the Journal of Medicinal Chemistry can be contacted at: American Chemical Society, 1155 16th Street, NW, Washington, DC 20036, USA.

Keywords: Ann Arbor, Michigan, United States, Nanotechnology, Cancer Therapy, Cancer Vaccine, Vaccine Delivery, Immunology, Immunotherapy, Medical Device, Oncology.

This article was prepared by Vaccine Weekly editors from staff and other reports. Copyright 2005, Vaccine Weekly via

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