Navigation Links
Steering stem cells with magnets
Date:7/16/2013

Magnets could be a tool for directing stem cells' healing powers to treat conditions such as heart disease or vascular disease.

By feeding stem cells tiny particles made of iron oxide, scientists at Emory and Georgia Tech can use magnets to attract the cells to a particular location in the body after intravenous injection.

The results are published online in the journal Small and will appear in an upcoming issue.

The paper was a result of collaboration between the laboratories of W. Robert Taylor, MD, PhD, and Gang Bao, PhD. Taylor is professor of medicine and biomedical engineering and director of the Division of Cardiology at Emory University School of Medicine. Bao is professor in the Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory University.

Co-first authors of the paper are postdoctoral fellows Natalia Landazuri, PhD, and Sheng Tong, PhD. Landazuri is now at the Karolinska Institute in Sweden.

The type of cells used in the study, mesenchymal stem cells, are not embryonic stem cells. Mesenchymal stem cells can be readily obtained from adult tissues such as bone marrow or fat. They are capable of becoming bone, fat and cartilage cells, but not other types of cell such as muscle or brain. They secrete a variety of nourishing and anti-inflammatory factors, which could make them valuable tools for treating conditions such as cardiovascular disease or autoimmune disorders.

Iron oxide nanoparticles are already FDA-approved for diagnostic purposes with MRI (magnetic resonance imaging). Other scientists have tried to load stem cells with similar particles, but found that the coating on the particles was toxic or changed the cells' properties. The nanoparticles used in this study have a polyethylene glycol coating that protects the cell from damage. Another unique feature is that the Emory/Tech team used a magnetic field to push the particles into the cells, rather than chemical agents used previously.

"We were able to load the cells with a lot of these nanoparticles and we showed clearly that the cells were not harmed," Taylor says. "The coating is unique and thus there was no change in viability and perhaps even more importantly, we didn't see any change in the characteristics of the stem cells, such as their capacity to differentiate."

"This was essentially a proof of principle experiment. Ultimately, we would target these to a particular limb, an abnormal blood vessel or even the heart."

The particles are coated with the nontoxic polymer polyethylene glycol, and have an iron oxide core that is about 15 nanometers across. For comparison, a DNA molecule is 2 nanometers wide and a single influenza virus is at least 100 nanometers wide.

The particles appear to become stuck in cells' lysosomes, which are parts of the cell that break down waste. The particles stay put for at least a week and leakage cannot be detected. The scientists measured the iron content in the cells once they were loaded up and determined that each cell absorbed roughly 1.5 million particles.

Once cells were loaded with iron oxide particles, the Emory/Tech team tested the ability of magnets to nudge the cells both in cell culture and in living animals.

In mice, a bar-shaped rare earth magnet could attract injected stem cells to the tail. The magnet was applied to the part of the tail close to the body while the cells were being injected. Normally most of the mesenchymal stem cells would become deposited in the lungs or the liver.

To track where the cells went inside the mice, the scientists labeled the cells with a fluorescent dye. They calculated that the bar magnet made the stem cells 6 times more abundant in the tail. In addition, the iron oxide particles themselves could potentially be used to follow cells' progress through the body.

"Next, we plan to focus on therapeutic applications in animal models where we will use magnets to direct these cells to the precise site need to affect repair and regeneration of new blood vessels," Taylor says.


'/>"/>

Contact: Quinn Eastman
qeastma@emory.edu
404-727-7829
Emory Health Sciences
Source:Eurekalert

Related biology technology :

1. New method for producing precursor of neurons, bone and other important tissues from stem cells
2. Biocept and Academic Collaborators to Present Posters at San Antonio Breast Cancer Symposium on Circulating Tumor Cells (CTCs)
3. Notre Dame researchers develop paint-on solar cells
4. Cord Blood America Announces Exclusive Agreement With National Childrens Leukemia Foundation to Store Stem Cells
5. Stem Cells: Worldwide Markets for Transplantation, Cord Blood Banking and Drug Development
6. In solar cells, tweaking the tiniest of parts yields big jump in efficiency
7. Mesenchymal Stem Cells Have New Cell Culture Environment
8. Discovery in Nature elucidates immune cells in skin and supports novel vaccine approach
9. Scientists Discover How a Bacterial Pathogen Breaks Down Barriers to Enter and Infect Cells
10. IntelliCell BioSciences Signs Technology Licensing Agreement with Stem Cells 21 Thailand
11. Study dusts sugar coating off little-known regulation in cells
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/10/2016)... ... 09, 2016 , ... Creation Technologies, leading global provider of ... Customer Rating Award from Circuits Assembly , today announced its milestone achievement of ... Mexico and China. , The EMS provider, known in the EMS industry for ...
(Date:2/9/2016)... , Feb. 9, 2016  Regenicin, Inc. ... company specializing in the development and commercialization of ... damaged tissues and organs, recently reported the Company,s ... first quarter of 2016. Lonza America ... new 2015 fiscal year in the process of ...
(Date:2/9/2016)... ... February 08, 2016 , ... ... services, announced today the launch of its revamped and improved website. In an ... service solutions, the redesigned website will better communicate how the company designs and ...
(Date:2/9/2016)... ... February 09, 2016 , ... Tunnell Consulting, Inc. announced that ... Paris, he will focus on acquiring new accounts and work closely with existing Tunnell ... , “Fred brings to our European clients more than 15 years of experience in ...
Breaking Biology Technology:
(Date:1/20/2016)... , Jan. 20, 2016  Synaptics Incorporated (NASDAQ: ... interface solutions, today announced sampling of S1423, its ... wearables and small screen applications including smartwatches, fitness ... Supporting round and rectangular shapes, as well as ... performance with moisture on screen, while wearing gloves, ...
(Date:1/15/2016)... Puerto Rico , Jan. 15, 2016 ... big and small to find new ways to ensure ... culture. iOS and Android ... based on biometrics, transforming it into a hardware authorization ... that users swipe their fingerprint on their KodeKey enabled ...
(Date:1/13/2016)... , January 13, 2016 /PRNewswire/ ... announced the addition of the  "India ... Estimation & Forecast (2015-2020)"  report ... http://www.researchandmarkets.com/research/7h6hnn/india_biometrics ) has announced the addition ... Identification Market - Estimation & Forecast ...
Breaking Biology News(10 mins):