Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > UI team improves delivery of cancer-fighting molecules

A mouse tumor treated with an aptamer-siRNA combination (right) shows many dead areas (indicated by the asterisks), whereas an untreated tumor (left) is still largely intact. Delivering siRNA successfully to specific cells has been challenging. UI researchers modified siRNA so that it could be injected into the bloodstream and impact only targeted cells.
A mouse tumor treated with an aptamer-siRNA combination (right) shows many dead areas (indicated by the asterisks), whereas an untreated tumor (left) is still largely intact. Delivering siRNA successfully to specific cells has been challenging. UI researchers modified siRNA so that it could be injected into the bloodstream and impact only targeted cells.

Abstract:
Small interfering RNA (siRNA), a type of genetic material, can block potentially harmful activity in cells, such as tumor cell growth. But delivering siRNA successfully to specific cells without adversely affecting other cells has been challenging.

UI team improves delivery of cancer-fighting molecules

Iowa City, IA | Posted on August 27th, 2009

University of Iowa researchers have modified siRNA so that it can be injected into the bloodstream and impact targeted cells while producing fewer side effects. The findings, which were based on animal models of prostate cancer, also could make it easier to create large amounts of targeted therapeutic siRNAs for treating cancer and other diseases. The study results appeared online Aug. 23 in the journal Nature Biotechnology.

"Our goal was to make siRNA deliverable through the bloodstream and make it more specific to the genes that are over expressed in cancer," said the study's senior author Paloma Giangrande, Ph.D., assistant professor of internal medicine and a member of Holden Comprehensive Cancer Center.

In previous research completed at Duke University, Giangrande's team showed that a compound called an aptamer can be combined with siRNA to target certain genes. When the combined molecule is directly injected into tumors in animal models, it triggers the processes that stop tumor growth. However, directly injecting the combination into tumors in humans is difficult.

In the new study, the researchers trimmed the size of a prostate cancer-specific aptamer and modified the siRNA to increase its activity. Upon injection into the bloodstream, the combination triggered tumor regression without affecting normal tissues.

Making the aptamer-siRNA combination smaller makes it easier to produce large amounts of it synthetically, Giangrande said.

The team also addressed the problem that large amounts of siRNA are needed since most of it gets excreted by the kidneys before having an effect. To keep siRNA in the body longer and thereby use less of it, the team modified it using a process called PEGlyation.

"If you want to use siRNA effectively for clinical use, especially for cancer treatment, you need to deliver it through an injection into the bloodstream, reduce the amount of side effects and be able to improve its cost-effectiveness. Our findings may help make these things possible," Giangrande said.

Although the current study focused on prostate cancer, the findings could apply to other cancers and diseases. Giangrande said the next step is to test the optimized aptamer-siRNA compound in a larger animal model.

Other researchers who contributed significantly to the study included James McNamara, Ph.D., and Anton McCaffrey, Ph.D., both UI assistant professors of internal medicine.

The study was supported by an American Cancer Society Institutional Research grant and a Lymphoma SPORE Development Research Award.

JOURNAL ARTICLE ABSTRACT: www.nature.com/nbt/journal/vaop/ncurrent/full/nbt.1560.html

####

About University of Iowa
The University of Iowa is a major national research university located on a 1,900-acre campus in Iowa City in southeast Iowa, on the Iowa River near the intersection of U.S. Interstate Highways 80 and 380. Iowa is composed of 11 colleges, the largest of which is the College of Liberal Arts and Sciences, enrolling most of Iowa's undergraduates. The Henry B. Tippie College of Business, the Roy J. and Lucille A. Carver College of Medicine, and the Colleges of Education, Engineering, Law, Nursing, Pharmacy, enroll undergraduates, and with the Colleges of Dentistry and Public Health provide graduate education in conjunction with the Graduate College.

For more information, please click here

Contacts:
Becky Soglin
319-356-7127

Copyright © University of Iowa

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Tiny sensor lays groundwork for precision X-rays detection via endoscopy:Nanoscale fiber-integrated X-ray sensor opens new doors for medical imaging and radiotherapy March 29th, 2017

Researchers uncover secret of nanomaterial that makes harvesting sunlight easier March 29th, 2017

Information storage with a nanoscale twist: Discovery of a novel rotational force inside magnetic vortices makes it easier to design ultrahigh capacity disk drives March 28th, 2017

A big leap toward tinier lines: Self-assembly technique could lead to long-awaited, simple method for making smaller microchip patterns March 27th, 2017

Possible Futures

Tiny sensor lays groundwork for precision X-rays detection via endoscopy:Nanoscale fiber-integrated X-ray sensor opens new doors for medical imaging and radiotherapy March 29th, 2017

Researchers uncover secret of nanomaterial that makes harvesting sunlight easier March 29th, 2017

Information storage with a nanoscale twist: Discovery of a novel rotational force inside magnetic vortices makes it easier to design ultrahigh capacity disk drives March 28th, 2017

Laser activated gold pyramids could deliver drugs, DNA into cells without harm: Microstructures create temporary pores in cells March 27th, 2017

Nanomedicine

Tiny sensor lays groundwork for precision X-rays detection via endoscopy:Nanoscale fiber-integrated X-ray sensor opens new doors for medical imaging and radiotherapy March 29th, 2017

Laser activated gold pyramids could deliver drugs, DNA into cells without harm: Microstructures create temporary pores in cells March 27th, 2017

Researchers make flexible glass for tiny medical devices: Glass can bend over and over again on a nanoscale March 27th, 2017

Cryo-electron microscopy achieves unprecedented resolution using new computational methods March 25th, 2017

Discoveries

Tiny sensor lays groundwork for precision X-rays detection via endoscopy:Nanoscale fiber-integrated X-ray sensor opens new doors for medical imaging and radiotherapy March 29th, 2017

Researchers uncover secret of nanomaterial that makes harvesting sunlight easier March 29th, 2017

Information storage with a nanoscale twist: Discovery of a novel rotational force inside magnetic vortices makes it easier to design ultrahigh capacity disk drives March 28th, 2017

A big leap toward tinier lines: Self-assembly technique could lead to long-awaited, simple method for making smaller microchip patterns March 27th, 2017

Announcements

Tiny sensor lays groundwork for precision X-rays detection via endoscopy:Nanoscale fiber-integrated X-ray sensor opens new doors for medical imaging and radiotherapy March 29th, 2017

Researchers uncover secret of nanomaterial that makes harvesting sunlight easier March 29th, 2017

Information storage with a nanoscale twist: Discovery of a novel rotational force inside magnetic vortices makes it easier to design ultrahigh capacity disk drives March 28th, 2017

ATTOPSEMI Technology Joins FDXcelerator Program to Deliver Advanced Non-Volatile Memory IP to GLOBALFOUNDRIES 22 FDX® Technology Platform: Leading-edge I-fuse™ brings higher reliability, smaller cell size and ease of programmability for consumer, automotive, and IoT applications March 27th, 2017

Grants/Sponsored Research/Awards/Scholarships/Gifts/Contests/Honors/Records

“Cysteine Rose” Wins 2016 Thermo Fisher Scientific Electron Microscopy Image Contest: Thermo Fisher honors Andrea Jacassi of the Italian Institute of Technology for image of cysteine crystals using focused ion beam techniques March 27th, 2017

Argon is not the 'dope' for metallic hydrogen March 24th, 2017

Rice U. refines filters for greener natural gas: New study defines best materials for carbon capture, methane selectivity March 23rd, 2017

Artificial photosynthesis steps into the light: Rice University lab turns transition metals into practical catalyst for solar, other applications March 23rd, 2017

Nanobiotechnology

Laser activated gold pyramids could deliver drugs, DNA into cells without harm: Microstructures create temporary pores in cells March 27th, 2017

Cryo-electron microscopy achieves unprecedented resolution using new computational methods March 25th, 2017

Nanobiotix: The Independent Data Monitoring Committee Recommends the Continuation of the Ongoing Phase II/III Trial of NBTXR3 in Soft Tissue Sarcoma March 23rd, 2017

Nanoparticle paves the way for new triple negative breast cancer drug March 20th, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project