Navigation Links
New microscopy tracks molecules in live tissue at video rate
Date:12/2/2010

CAMBRIDGE, Mass. -- A novel type of biomedical imaging, made possible by new advances in microscopy from scientists at Harvard University, is so fast and sensitive it can capture "video" of blood cells squeezing through capillaries.

Researchers led by Harvard's Brian G. Saar, Christian W. Freudiger, and X. Sunney Xie describe the work this week in the journal Science.

The new technique, based on stimulated Raman scattering (SRS), makes a complementary partner to MRI, widely used to capture static images of organs, tumors, and other large structures. For the first time, SRS microscopy makes possible label-free chemical movies, with streaming footage at the subcellular level, catching video of proteins, lipids, and water within cells.

"When we started this project 11 years ago, we never imagined we'd have an amazing result like this," says Xie, professor of chemistry and chemical biology at Harvard. "It took MRI more than 30 years to reach patients, but we're already looking forward with great anticipation to applications of SRS microscopy in hospitals. It's now clear that stimulated Raman scattering will play an important role in the future of biological imaging and medical diagnostics."

Xie says SRS microscopy could aid, and speed, surgery to remove tumors and other lesions. Surgeons must now send excised samples for histological analysis -- a process that takes about 20 minutes -- while a patient waits on the operating table. SRS microscopy provides equivalent insights through real-time scanning.

Xie's team has already used SRS microscopy to track migration of medications in skin, shedding new light on the absorption of topical drugs. In conjunction with endoscopy, the technique can also view three-dimensional sections of tissue, layer by layer.

"Previous SRS microscopy captured only about one image per minute, far too slow for use in live animals or humans," Xie says. "We were able to speed the collection of data by more than three orders of magnitude, attaining video-rate imaging."

Because SRS microscopy works by detecting the intrinsic vibrations in chemical bonds between atoms, it doesn't require intrusive fluorescent labeling. An optical technique, it compliments MRI, whose depth of penetration is better suited to imaging organs and other large objects deep within the body.

The current work greatly improves detection of signals -- backscattered by tissues in the body -- by rearranging photodetectors to surround a small aperture through which a beam of light is directed at the tissue being examined. Using this approach, the scientists were able to collect and analyze almost 30 percent of the laser light directed at a biological sample, a more than 30-fold increase over previous SRS microscopy.

Scientists currently use a variety of techniques to view biomolecules, but most have significant limitations that are sidestepped by SRS microscopy. Labeling with green fluorescent protein (GFP) provides sharp images, but the bulky protein can perturb delicate biological pathways, overwhelming smaller biomolecules. Conventional infrared (IR) microscopy has low spatial resolution and requires desiccated samples, while spontaneous Raman microscopy requires high laser power and long integration times, limiting use in live specimens. Coherent anti-Stokes Raman scattering (CARS) microscopy, pioneered by Xie's own group, lacks the contrast to image most molecules beyond lipids.


'/>"/>

Contact: Steve Bradt
steve_bradt@harvard.edu
617-496-8070
Harvard University
Source:Eurekalert  

Related medicine news :

1. Hayes, Inc. Technology Prognosis Team Tracks First-of-a-Kind Technologies
2. Fit People Release More Fat-Burning Molecules During Exercise
3. Exploring the Davids and Goliaths of therapeutic molecules
4. New Cancer-Fighting Strategy Focuses On Signaling Molecules
5. Tiny molecules may tell big story about cardiovascular disease risk
6. Nerve Tissue Cancer More Often Fatal for Non-White Kids
7. Stanford researchers first to turn normal cells into 3-D cancers in tissue culture dishes
8. Scientists develop method to keep surgically-removed prostate tissue alive and working for week
9. IU researchers: Chemotherapy alters brain tissue in breast cancer patients
10. USGI medical tissue anchors show durability beyond 1 year
11. Natural lung material is promising scaffold for engineering lung tissue using embryonic stem cells
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New microscopy tracks molecules in live tissue at video rate
(Date:4/28/2017)... Edinburg, Texas (PRWEB) , ... April 28, 2017 , ... ... a plaque in recently to the labor and delivery team at Women’s Hospital at ... generous mothers who give birth at the hospital and decide to donate. , ...
(Date:4/28/2017)... ... April 28, 2017 , ... Yisrayl Hawkins, Pastor and Overseer at The House of Yahweh ... Creator responds to and which He does not. Yisrayl says with so many titles ... the true name, but he says with a little Scripture, backed with a lot of ...
(Date:4/28/2017)... ... 28, 2017 , ... NuevaCare, a leading home care agency based in San ... Alto, is proud to announce information upgrades to its blog in the form of ... on topics such as home care (generally) as well as senior care and home ...
(Date:4/27/2017)... ... 2017 , ... The Incentive Research Foundation is pleased to ... a groundbreaking analysis of how behavioral economics can be applied to the incentive, ... programs, the report highlights proven behavioral economics approaches and the powerful role emotions ...
(Date:4/27/2017)... ... April 27, 2017 , ... SyncDog, Inc. ... at MobileIron Live! 2017 in Santa Clara, California. Each year, MobileIron ... approach to helping organizations maximize the benefits of mobility in their operations securely. ...
Breaking Medicine News(10 mins):
(Date:4/19/2017)... NASHVILLE , Tenn. and DALLAS , ... and EndoStim, Inc., announced that the first patients in ... with the EndoStim device in the Lower Esophageal Sphincter ... is a minimally-invasive implantable device designed to provide long-term ... through neurostimulation. GERD affects nearly 65 million ...
(Date:4/19/2017)... , April 19, 2017  Novartis today announced ... National Heart, Lung, and Blood Institute (NHLBI) of ... 58% of patients with treatment-naïve severe aplastic anemia ... treated with eltrombopag at the initiation of and ... study evaluated three sequential treatment groups, or cohorts. ...
(Date:4/18/2017)... April 18, 2017 Research and Markets has ... report to their offering. ... The global arthroscopy devices market to grow at a CAGR of ... Arthroscopy Devices Market 2017-2021, has been prepared based on an in-depth ... market landscape and its growth prospects over the coming years. The ...
Breaking Medicine Technology: