Corporate Banner
Satellite Banner
RNAi
Scientific Community
 
Become a Member | Sign in
Home>News>This Article
  News
Return

Tiny Tools Help Advance Medical Discoveries

Published: Tuesday, January 08, 2013
Last Updated: Tuesday, January 08, 2013
Bookmark and Share
MIT researchers are designing tools to analyze cells at the microscale.

To understand the progression of complex diseases such as cancer, scientists have had to tease out the interactions between cells at progressively finer scales — from the behavior of a single tumor cell in the body on down to the activity of that cell’s inner machinery.

To foster such discoveries, mechanical engineers at MIT are designing tools to image and analyze cellular dynamics at the micro- and nanoscale. Such tools, including microfluidics, membrane technology and metamaterials, may help scientists better characterize and develop therapies for cancer and other complex diseases.

New medical discoveries depend on engineering advances in real-time, multifunctional imaging and quantitative analysis, says Nicholas Fang, an associate professor of mechanical engineering.

“What we’ve learned so far is more or less the architecture of cells, and the next layer is the dynamics of cells,” says Fang, who is developing optical sensors to illuminate individual components within a cell. “Cells operate like a city, or a metropolitan area: You have traffic, flow of information, and logistics of materials, and responses related to different events. Medicine requires new modes of seeing these events with better precision in time and space.”

Materials beyond nature

Fang is developing new imaging tools from metamaterials — materials engineered to exhibit properties not normally found in nature. Such materials may be designed as “superlenses” that bend and refract light to image extremely small objects. For example, Fang says that today’s best imaging tools can capture signaling between individual neurons, which may appear as a fuzzy “plume” of neurotransmitters. A superlens, in contrast, would let scientists see individual neurotransmitter molecules at the scale of a few nanometers. Such acuity, he says, would allow scientists to identify certain chemical transmitters that are directly related to particular diseases.

Metamaterials may also help scientists manipulate cells at the microscale. Fang is exploring the use of metamaterials as optical antennae to improve a technique known as optogenetics. This technique, developed in 2005 (and pioneered by MIT’s Ed Boyden, the Benesse Career Development Associate Professor of Research in Education), involves genetically engineering proteins to respond to light. Using various colors of light, scientists may control the activity or expression of such proteins to study the progression of disease. However, researchers have found that the technique requires a large amount of light to prompt a response, risking overheating or damaging the proteins of interest.

To solve this problem, Fang and his colleagues are looking to metamaterials to design tiny optical receivers, similar to radio antennae. Such receivers would attach to a given protein, boosting its receptivity to light, and thereby requiring less light to activate the protein. The project is in its initial stages; Fang says his group is now seeking materials that are compatible with proteins and other biological tissues.

Sorting cells

MIT researchers are also developing tools to sort individual cells — part of an effort to provide simple, cost-effective diagnostic tools for certain diseases. Rohit Karnik, an associate professor of mechanical engineering, is approaching cell sorting from a variety of directions. His lab is fabricating microfluidic, or “lab-on-a-chip,” devices — chips as small as a dime that efficiently sort cells, separating out those of interest from a sample of blood or biological fluid.

Karnik’s group employs nanofabrication techniques to etch tiny, precisely patterned channels into small squares of polymer. The arrangement of the channels directs fluid, capturing cells of interest via “cell rolling,” a phenomenon by which cells roll to one side of a channel, attracted by a wall’s surface coating. The device is a relatively simple, passive cell-sorter that Karnik says may efficiently sort out material such as white blood cells — cells that may quickly be counted to identify conditions such as sepsis and inflammation.  

Karnik is also developing small membranes punctured with microscopic pores. Each pore is a few nanometers wide, small enough to let individual DNA molecules through. By passing an electric current through the nanopore, the researchers can measure certain characteristics of a DNA molecule, such as its size and the presence of any additional proteins bound to it.

Such membrane technology may drastically simplify the process of sizing DNA molecules and mapping DNA modifications, which are critical for understanding gene regulation and the dynamics of cellular machinery — now a lengthy process that involves expensive bench-top instruments. Instead, Karnik says, nanopore membranes may be a faster, cheaper alternative that could work with single DNA molecules with no loss of information from DNA-amplification steps.

Cancer in a chip

Researchers are investigating microfluidics not only as a means to sort cells, but as a way of replicating whole biological environments at the microscale.

“We use microfluidics to develop more realistic models of organs and human physiology so that we can look at, for example, how a tumor cell interacts with other cells in the local environment,” says Roger Kamm, the Cecil and Ida Green Distinguished Professor of Biological and Mechanical Engineering.

Kamm and his colleagues have developed a microfluidic chip that contains tiny channels and reservoirs, in which they can seed various cell types. The group is using the device to study how cancer spreads through the body. Cancer becomes metastatic when tumor cells break off from a primary tumor and cross through a blood vessel wall and into the bloodstream. Kamm is using the group’s microfluidic designs to mimic the metastatic process and identify agents to prevent it.

To replicate the lining of a blood vessel, Kamm seeds one channel in the chip with endothelial cells. In a neighboring channel, he injects a gel, mimicking the body’s extracellular matrix. The group can introduce tumor cells into the gel, along with other chemical agents. In the controlled setup, they can monitor the behavior of tumor cells, and the conditions in which the cells penetrate the endothelial lining, in order to enter a blood vessel.

“This allows us to put cells in close proximity so they can signal with each other in a more realistic fashion,” Kamm says.

Compared with conventional cancer-screening techniques, the microfluidic technique more closely resembles natural processes in the body, Kamm says. For example, pharmaceutical companies tend to test potential drugs in large batches, injecting a drug into tiny, isolated wells containing tumor cells. That works well to test for drugs that kill the tumor, but not so well for identifying drugs that can prevent metastatic disease.

“What we’re finding is that cells behave completely differently when you have a realistic environment, with cells communicating with different cell types, and when a cell is in a three-dimensional matrix, as opposed to when you have a single cell type inside a well on a two-dimensional, rigid surface,” Kamm says. “High-throughput systems probably miss a lot of potentially good drugs, and they also identify drugs that fail at subsequent stages of testing.”

Karnik, who has collaborated with Kamm on a few lab-on-a-chip designs, sees such devices and other engineering tools as a key connection in pushing medical discoveries, and effective therapies, forward.

“A clinician might say, ‘I need to know whether the patient has this disease or that disease,’ and the biologist would say, ‘Oh, in order to do that, you need to measure molecules A, B and C,’ and it’s up to the engineers to figure out how to do it,” Karnik says. “That’s our key role, bridging in between.”


Further Information

Join For Free

Access to this exclusive content is for Technology Networks Premium members only.

Join Technology Networks Premium for free access to:

  • Exclusive articles
  • Presentations from international conferences
  • Over 3,500+ scientific posters on ePosters
  • More than 5,000+ scientific videos on LabTube
  • 35 community eNewsletters


Sign In



Forgotten your details? Click Here
If you are not a member you can join here

*Please note: By logging into TechnologyNetworks.com you agree to accept the use of cookies. To find out more about the cookies we use and how to delete them, see our privacy policy.

Related Content

High-Capacity Nanoparticles
New type of nanoparticle can now have three or more drugs packaged within it, allowing for customised cancer therapy.
Thursday, September 15, 2016
Delivering Beneficial Bacteria
Method that transports microbes through the stomach to the intestine may benefit human health.
Thursday, September 15, 2016
Linking RNA Structure and Function
Biologists have deciphered a lncRNA structure and used the information to investigate its cellular protein interactions.
Friday, September 09, 2016
Triple-Action Therapy Patch Shows Promise
Patch that delivers drug, gene, and light-based therapy to tumor sites shows promising results in mice.
Wednesday, July 27, 2016
New Device can Study Electric Field Cancer Therapy
Microfluidic device allows study of electric field cancer therapy through low-intensity fields, preventing malignant cells spreading.
Friday, July 08, 2016
Long-Term Drug Release
New tablet attaches to the lining of the GI tract, resists being pulled away.
Thursday, April 07, 2016
Cancer Cells Remodel Environments Before Spreading
Researchers at MIT have found that the cancer cells remodel their environment to make it easier to reach nearby blood vessels.
Wednesday, March 16, 2016
Paving the Way for Metastasis
Cancer cells remodel their environment to make it easier to reach nearby blood vessels.
Tuesday, March 15, 2016
Curing Disease by Repairing Faulty Genes
New delivery method boosts efficiency of CRISPR genome-editing system.
Wednesday, February 03, 2016
No More Insulin Injections?
Encapsulated pancreatic cells offer possible new diabetes treatment.
Tuesday, January 26, 2016
Engineering Foe into Friend
Bose Grant awardee Jacquin Niles aims to repurpose the malaria parasite for drug delivery.
Monday, January 25, 2016
Supply Chain
Chemists discover how a single enzyme maintains a cell’s pool of DNA building blocks.
Wednesday, January 13, 2016
How Cancer Cells Spread
Study offers new targets for drugs that may prevent cancer from spreading.
Thursday, December 17, 2015
Delivering microRNAs for Cancer Treatment
Scientists exploit gene therapy to shrink tumors in mice with an aggressive form of breast cancer.
Wednesday, December 09, 2015
Using Ultrasound to Improve Drug Delivery
New approach could aid in treatment of inflammatory bowel disease.
Friday, October 23, 2015
Scientific News
Potential of New Insect Control Traits in Agriculture
Researchers have discovered a protein that shows promise as an alternate corn rootworm control mechanism.
Fighting Cancer with Sticky Nanoparticles
Treatment that uses bioadhesive nanoparticles drug carriers proved more effective than conventional treatments for certain cancers.
Fighting Plant Pathogens with RNA
Researchers develop strategy that could lead to environmentally friendly fungicide to fight pathogens.
Smart Material Hunts Cancers
Team has created smart material that locates and images cancer or tumour sites in tissue.
Examining mtDNA May Help Identify Unknown Ancestry That Influences Breast Cancer Risk
Researchers studying mtDNA in a group of triple negative breast cancer patients found that 13 percent of participants were unaware of ancestry that could influence their risk of cancer.
Gene Therapy Technique May Help Prevent Cancer Metastasis
Gene-regulating RNA molecules could help treat early-stage breast cancer tumors before they spread.
Enhancing Antibiotics to Defeat Resistant Bacteria
Scientists enhance ability of antibiotics to defeat resistant types of bacteria using molecules called PPMOs
MRI Guidance Aids Stem Cell Delivery
Scientists have delivered stem cells to the brain with unprecedented precision, infusing the cells under real-time MRI guidance.
High-Capacity Nanoparticles
New type of nanoparticle can now have three or more drugs packaged within it, allowing for customised cancer therapy.
UTSW Creates Nanoparticles That Target Lung Cancer Cells
Researchers at UTSW have developed a synthetic polymers that could deliver nucleic acid drugs while possessing enough structural diversity to discover cancer cell-specific nanoparticles.
SELECTBIO

SELECTBIO Market Reports
Go to LabTube
Go to eposters
 
Access to the latest scientific news
Exclusive articles
Upload and share your posters on ePosters
Latest presentations and webinars
View a library of 1,800+ scientific and medical posters
3,500+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
5,000+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FOR FREE!