Navigation Links
Scientists can predict nano drug outcome
Date:2/5/2009

Scientists including one from The University of Texas Health Science Center at Houston successfully predicted the outcome of a nano drug on breast tumors in a pre-clinical study. Their research could help determine which patients will respond best to cancer-fighting nano drugs.

Researchers from the Georgia Institute of Technology and Emory University also participated in the study, which appears in the February issue of Radiology.

The investigators used contrast agents encapsulated in tiny fat bubbles called liposomes to determine if breast tumors in rodents could be breached by liposomes loaded with a cancer drug called liposomal doxorubicin. The liposomes were administered intravenously.

When scientists X-rayed the rodents, the investigators received good images of porous breast tumors which had absorbed the contrast agents. On the other hand, poor images indicated the contrast agents had not substantially penetrated the tumor. When liposomal doxorubicin was administered, it was associated with better therapeutic results in the tumors with superior images.

"We can tell if the animals are candidates for the treatment or not," said Ananth Annapragada Ph.D., one of two senior authors and an associate professor at The University of Texas School of Health Information Sciences at Houston.

Higher uptake of the probe by the tumor, indicating leakier vasculature, was associated with a slower tumor growth rate, suggesting a better therapeutic outcome with liposomal doxorubicin, the authors wrote. A nanometer is a billionth of a meter and a liposome is about 100 nanometers.

Nano drugs for cancer like liposomal doxorubicin are designed to increase the amount of drug reaching tumors. Currently, when an intravenous cancer drug is administered, very little reaches its intended target. The remaining drug circulates in the bloodstream and can cause side effects.

Liposomes carrying drugs infiltrate leaky tumors that have pores up to eight times the size of these miniaturized drug carriers. If a liposome with contrast agents can penetrate a tumor and be detected by X-rays, there is a good chance that a liposome with anti-cancer agents can enter the tumor, too. "We found that different tumors light up differently. The tumors that light up well take up the agent. Consequently, these are the tumors most likely to respond to liposomal doxorubicin," Annapragada said.

The current clinical protocols for liposomal doxorubicin consist of a standard dose every three to four weeks, the authors wrote. No prior knowledge of tumor vessel status, especially leakiness, is taken into account for the dose scheduling. However, it is well known that the degree of tumor vasculature leakiness differs not only among same-type tumors, but even spatially in the same tumor.

"This new information could help personalize the treatment of cancer with liposomal doxorubicin," Annapragada said.

In addition to predicting the outcome of liposomal doxorubicin on breast tumors, liposomes can be used for live monitoring of anti-cancer agents in action. When loaded with both contrast agents and liposomal doxorubicin, the liposomes provide information on tumor leakiness, which can be used in tumor prognostication. A pre-clinical study on multi-functional liposomes by many of the same researchers was published in Biomaterials in December.

Annapragada and the study's other senior author, Ravi V. Bellamkonda, Ph.D., of the Georgia Institute of Technology/Emory University, are involved in a UT Health Science Center at Houston portfolio start-up company called Marval Biosciences that is working to translate these enhanced medical imaging techniques into patient diagnostics.


'/>"/>

Contact: Robert Cahill
Robert.Cahill@uth.tmc.edu
713-500-3042
University of Texas Health Science Center at Houston
Source:Eurekalert

Related biology news :

1. CSHL scientists discover how companion cells to sperm protect them from genetic damage
2. Weizmann Institute scientists show extra copies of a gene carry extra risk
3. Scientists discover how deadly fungus protects itself
4. Scientists discover hot spot for toxic HABS off Washington coastline
5. Scientists uncover new class of non-protein coding genes in mammals with key functions
6. Smithsonian scientists receive coveted BBVA Ecology and Conservation Award
7. CSHL scientists clarify editing error underlying genetic neurodegenerative disease
8. Weizmann Institute scientists discover how cancer cells survive a chemotherapy drug
9. Substantial work ahead for water issues, say scientists at ACS Final Report briefing
10. CSHL scientists find a new class of small RNAs and define its function
11. Scientists uncover new genetic variations linked to psoriasis
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/28/2016)... BANGALORE, India , April 28, 2016 ... subsidiary of Infosys (NYSE: INFY ), and Samsung ... global partnership that will provide end customers with a ... and payment services.      (Logo: http://photos.prnewswire.com/prnh/20130122/589162 ... for financial services, but it also plays a fundamental part ...
(Date:4/15/2016)... , April 15, 2016  A new partnership ... more accurate underwriting decisions in a fraction of ... competitively priced and high-value life insurance policies to ... With Force Diagnostics, rapid testing (A1C, ... data readings (blood pressure, weight, pulse, BMI, and ...
(Date:3/31/2016)... 31, 2016  Genomics firm Nabsys has completed a ... Barrett Bready , M.D., who returned to the company ... technical leadership team, including Chief Technology Officer, John ... Steve Nurnberg and Vice President of Software and Informatics, ... Dr. Bready served as CEO of Nabsys ...
Breaking Biology News(10 mins):
(Date:5/18/2016)... , ... May 18, 2016 , ... ... Sciences Summer Camp at The University of Toledo. This two-day camp will take ... opportunity to explore the field of pharmaceutical sciences in preparation for a university ...
(Date:5/18/2016)... ... May 18, 2016 , ... STACS DNA Inc., the sample tracking ... and report sexual assault kit processing to help them save time and reduce errors. ... for kits to be processed and victims informed of results. Due to a previous ...
(Date:5/18/2016)... ... , ... The Academy of Model Aeronautics has been helping graduating seniors achieve ... of $1 million in awarded scholarships. , The AMA is happy to announce that ... nation has helped bring the total of AMA scholarships that have been given to ...
(Date:5/17/2016)... 2016 Haselmeier announces the launch ... approval by EMA, the European Medicines Agency. Originally launched ... company, the new pen version includes enhancements to further ... confidence to patients during use. Its enhanced ... to handle with a larger display window that improves ...
Breaking Biology Technology: