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Nanomedicine system engineered to enhance therapeutic effects of injectable drugs
Date:3/3/2008

ltistage approach, according to Ferrari, is needed to circumvent the bodys natural defenses or biobarriers, which act as obstacles to foreign objects injected in the blood stream. To overcome this problem, we hypothesized and developed a multifunctional MDS comprising stage 1 mesoporous particles loaded with one or more types of stage 2 nanoparticles, which can in turn carry either active agents or higher-stage particles. We have demonstrated the loading, controlled release and simultaneous in vitro delivery of quantum-dots and carbon nanotubes to human vascular cells, the authors write.

In addition to circumventing biobarriers, Ferraris team is working on the biochemical modifications required to efficiently deliver the MDS to a specific cancer lesion. We have preliminary data that show that we can localize a payload of diagnostic agents, therapeutic agents or combination of both to target cells. Once on site, the molecules can be released in a controlled way and then the MDS will degrade in 24 to 48 hours, be transformed into orthosilicic acid and leave no trace in the body, Ferrari said.

Lead author Ennio Tasciotti, Ph.D., senior postdoctoral fellow in the NanoMedicine Research Center at the UT Health Science Center at Houston, said the proof-of-concept study would have not been possible without a multidisciplinary effort including contributions from mathematicians, physicists, engineers, chemists and biologists.

We are dealing with objects that are in the billionth of a meter size range and to study such objects we used cutting edge technologies, Tasciotti said. The characterization of the particles was performed using scanning electron and atomic force microscopy, dynamic light scattering, fluorimetry and flow cytometry. The interaction of particles with cells was studied using fluorescence and confocal microscopy as well as a series of assays intended to determine cell viability and internalization rate of the nanoparticles.


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Contact: Robert Cahill
Robert.Cahill@uth.tmc.edu
713-500-3030
University of Texas Health Science Center at Houston
Source:Eurekalert  

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