Navigation Links
Rice chemists cram 2 million nanorods into single cancer cell
Date:11/16/2011

Rice University chemists have found a way to load more than 2 million tiny gold particles called nanorods into a single cancer cell. The breakthrough could speed development of cancer treatments that would use nanorods like tiny heating elements to cook tumors from the inside.

The research appears online this week in the chemical journal Angewandte Chemie International Edition.

"The breast cancer cells that we studied were so laden with gold nanorods that their masses increased by an average of about 13 percent," said study leader Eugene Zubarev, associate professor of chemistry at Rice. "Remarkably, the cells continued to function normally, even with all of this gold inside them."

Though the ultimate goal is to kill cancer, Zubarev said the strategy is to deliver nontoxic particles that become deadly only when they are activated by a laser. The nanorods, which are about the size of a small virus, can harvest and convert otherwise harmless light into heat. But because each nanorod radiates miniscule heat, many are needed to kill a cell.

"Ideally, you'd like to use a low-power laser to minimize the risks to healthy tissue, and the more particles you can load inside the cell, the lower you can set the power level and irradiation time," said Zubarev, an investigator at Rice's BioScience Research Collaborative (BRC).

Unfortunately, scientists who study gold nanorods have found it difficult to load large numbers of particles into living cells. For starters, nanorods are pure gold, which means they won't dissolve in solution unless they are combined with some kind of polymer or surfactant. The most commonly used of these is cetyltrimethylammonium bromide, or CTAB, a soapy chemical often used in hair conditioner.

CTAB is a key ingredient in the production of nanorods, so scientists have often relied upon it to make nanorods soluble in water. CTAB does this job by coating the surface of the nanorods in much the same way that soap envelopes and dissolves droplets of grease in dishwater. CTAB-encased nanorods also have a positive charge on their surfaces, which encourages cells to ingest them. Unfortunately, CTAB is also toxic, which makes it problematic for biomedical applications.

In the new research, Zubarev, Rice graduate student Leonid Vigderman and former graduate student Pramit Manna, now at Applied Materials Inc., describe a method to completely replace CTAB with a closely related molecule called MTAB that has two additional atoms attached at one end.

The additional atoms -- one sulfur and one hydrogen -- allow MTAB to form a permanent chemical bond with gold nanorods. In contrast, CTAB binds more weakly to nanorods and has a tendency to leak into surrounding media from time to time, which is believed to be the underlying cause of CTAB-encased nanorod toxicity.

It took Zubarev, Vigderman and Manna several years to identify the optimal strategy to synthesize MTAB and substitute it for CTAB on the surface of the nanorods. In addition, they developed a purification process that can completely remove all traces of CTAB from a solution of nanorods.


'/>"/>

Contact: David Ruth
druth@rice.edu
713-348-6327
Rice University
Source:Eurekalert

Related medicine news :

1. UF medicinal chemists modify sea bacteria byproduct for use as potential cancer drug
2. Breathing easy: LSU biochemists offer first 3-D model of asthma-causing inflammation enzyme
3. MIT chemists engineer plants to produce new drugs
4. Flu Hits 90 Million Children Under 5 Each Year
5. Getting on your nerves: $1.4 million NIH grant to study the regeneration of nerves
6. Scripps Research scientist receives $1 million research grant from Novo Nordisk
7. Scott & White Cancer Research Institute receives $3.5 million grant
8. Earthquakes Put Millions of Lives, Major Cities at Risk
9. Penn collaborates on $8 million Barretts esophagus research network
10. NYUCD awarded $2.2 million NIH grant to decode genome of caries-causing bacteria
11. BUSM researcher awarded 2 NIH grants totaling over $11 million
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/26/2017)... (PRWEB) , ... February 26, 2017 , ... ODH, Inc.™ ... Care Summit, February 27-28 at the Sheraton Pentagon City Hotel in Arlington, VA. ODH’s ... PerformCARE to use behavioral health analytics to improve Medicaid population health management. , ODH ...
(Date:2/24/2017)... , ... February 24, 2017 , ... ... newly designed TaskMate Go. Core benefits and advantages built into the home office ... stylish, functional look and feel. Ability to gain the benefits embedded in the ...
(Date:2/24/2017)... ... February 24, 2017 , ... An in-depth computational analysis ... University of Pittsburgh points to eight genes that may explain why susceptibility to one ... the results of a study published today in the journal npj Schizophrenia. , ...
(Date:2/24/2017)... ... 2017 , ... With millions of Americans and people worldwide ... all are aware of our options and are empowered with strength and information ... of its newest edition of "Vision and Hearing" in USA Today, that will ...
(Date:2/24/2017)... ... February 24, 2017 , ... The California State University Institute for Palliative ... in or interested in palliative care education and research. The Symposium, “Innovate. Investigate. ... County San Diego on Sept. 28 and 29, 2017, on the campus of California ...
Breaking Medicine News(10 mins):
(Date:2/24/2017)... YORK , Feb. 23, 2017  This report ... Thousand by the following Products: Intermediates, ... in the report include Pharmaceuticals, and Agrochemicals. The report ... Japan , Europe , and ... for the period 2015 through 2022. Also, a six-year ...
(Date:2/24/2017)... 24, 2017  Xynomic Pharmaceuticals, Inc., an oncology drug ... has acquired exclusive worldwide rights to develop, manufacture ... inhibitor targeting hematological and solid tumors. ... and 2 clinical trials of Abexinostat in US, ... already been completed, demonstrating that Abexinostat is clinically ...
(Date:2/23/2017)... -- Genesis Healthcare Services has merged with Hospice Cloud, a ... Bill Monast , President and CEO of Hospice Cloud ... , executives with Home Health Depot, Inc., the parent ... This acquisition helps Hospice Cloud maintain its position as ... equipment (DME) solutions for the hospice industry. Nathan ...
Breaking Medicine Technology: