Navigation Links
MIT: New cell measurement system
Date:4/11/2010

CAMBRIDGE, Mass. Using a sensor that weighs cells with unprecedented precision, MIT and Harvard researchers have measured the rate at which single cells accumulate mass a feat that could shed light on how cells control their growth and why those controls fail in cancer cells.

The research team, led by Scott Manalis, MIT associate professor of biological engineering, revealed that individual cells vary greatly in their growth rates, and also found evidence that cells grow exponentially (meaning they grow faster as they become larger).

The new measurement system, reported in the April 11 edition of the journal Nature Methods, is the first technique that can measure cells' mass as they grow over a period of time, ranging from five to 30 minutes. Previous methods for measuring cell growth rates have focused on volume or length measurements, and have not yet exhibited the necessary precision for revealing single cell growth models.

How they did it: The cell-mass sensor, which Manalis first demonstrated in 2007, consists of a fluid-filled microchannel etched in a tiny silicon slab that vibrates inside a vacuum. As cells flow through the channel, one at a time, their mass slightly alters the slab's vibration frequency. The mass of the cell can be calculated from that change in frequency, with a resolution as low as a femtogram (10-15 grams).

Michel Godin, a former postdoctoral associate in Manalis' lab and co-lead author of the paper, developed a way to trap a cell within the microchannel by precisely coordinating the flow direction. That enables the researchers to repeatedly pass a single cell through the channel every second or so, measuring it each time it moves through.

The researchers studied four types of cells: two strains of bacteria (E. coli and B. subtilis), a strain of yeast and mammalian lymphoblasts (precursors to white blood cells). They showed that B. subtilis cells appear to grow exponentially, but they did not obtain conclusive evidence for E. coli. That's because there is so much variation between individual cell growth rates in E. coli, even for cells of similar mass, says Francisco Delgado, a grad student in Manalis' lab and co-lead author of the paper.

If cells do grow exponentially, it means there must be some kind of mechanism to control that growth. Otherwise, when cells divide into two slightly different-sized daughter cells, as they often do, the larger cell in each generation would always grow faster than the smaller cell, leading to inconsistent cell sizes.

"If there were no control over the process, the variation in cell size would be all over the map," says Marc Kirschner, professor of systems biology at Harvard Medical School and an author of the paper. However, biologists don't know yet how that control mechanism might work.

Next steps: In their current studies, the researchers are tagging proteins inside the cell with fluorescent molecules that reveal what stage of the cell cycle the cell is in, allowing them to correlate cell size with cell cycle position. They are also working on a way to add chemicals such as nutrients, antibiotics and cancer drugs to the fluid inside the microchannel, so they can study how those substances affect growth rates.


'/>"/>

Contact: Jennifer Hirsch
jfhirsch@mit.edu
617-253-1682
Massachusetts Institute of Technology
Source:Eurekalert

Related biology news :

1. Innerscope Research Adds to Its Advisory Board Two Pioneers in the Measurement and Application of Emotional Engagement
2. NIST issues human milk and blood serum SRMs for contaminant measurements
3. Innerscope Research Adds to Its Advisory Board Two Pioneers in the Measurement and Application of Emotional Engagement
4. Carbon accounting from atmospheric measurements -- the aircraft perspective
5. UI researchers help to improve carbon measurements in global climate studies
6. Successful series of measurements in Arctic sea ice
7. Scientists demonstrate the sharpest measurement of ice crystals in clouds
8. LDL particle measurement by NMR recognized by ADA, ACC
9. Worldwide atmospheric measurements will determine the role of atmospheric fine particles
10. Measurement Specialties, Inc. Announces Impact of German Business Tax Reform 2008 Resulting in Lower Combined German Tax Rate - Impacts 2Q08 Reported Financial Results
11. Unprecedented global measurement network achieves full coverage of oceans
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/11/2017)... Florida , April 11, 2017 ... a security technology company, announces the appointment of independent Directors ... Bendheim to its Board of Directors, furthering the company,s ... ... of NXT-ID, we look forward to their guidance and benefiting ...
(Date:4/4/2017)...   EyeLock LLC , a leader of iris-based ... Patent and Trademark Office (USPTO) has issued U.S. Patent ... an iris image with a face image acquired in ... 45 th issued patent. "The ... the multi-modal biometric capabilities that have recently come to ...
(Date:3/29/2017)... , March 29, 2017  higi, the health IT ... North America , today announced a ... the acquisition of EveryMove. The new investment and acquisition ... of tools to transform population health activities through the ... data. higi collects and secures data today ...
Breaking Biology News(10 mins):
(Date:10/9/2017)... 2017  BioTech Holdings announced today identification and ... ProCell stem cell therapy prevents limb loss in ... demonstrated that treatment with ProCell resulted in more ... compared to standard bone marrow stem cell administration.  ... reduction of therapeutic effect.  ...
(Date:10/9/2017)... ... October 09, 2017 , ... The ... medical marijuana products targeting the needs of consumers who are incorporating medical marijuana ... place in Phoenix, Arizona. , As operators of two successful Valley dispensaries, The ...
(Date:10/7/2017)... Seattle, WA (PRWEB) , ... ... ... the industry leader in Hi-C-based genomic technologies, launched its ProxiMeta™ Hi-C metagenome ... the ProxiMeta Hi-C kit and accompanying cloud-based bioinformatics software to perform Hi-C ...
(Date:10/6/2017)... ... October 06, 2017 , ... ... lunch discussion and webinar on INSIGhT, the first-ever adaptive clinical trial for glioblastoma ... Cancer Institute. The event is free and open to the public, but registration ...
Breaking Biology Technology: