Navigation Links
Mechanical regulation of cell substrates effects stem cell development, adhesion
Date:8/1/2010

PHILADELPHIA - Bioengineers at the University of Pennsylvania have created a system to control the flexibility of the substrate surfaces on which cells are grown without changing the surface properties, providing a technique for more controlled lab experiments on cellular mechanobiology, an important step in the scientific effort to understand how cells sense and respond to mechanical forces in their environment.

Researchers created a library of micromolded, hexagonally spaced elastomeric micropost arrays, one to a few microns high, on which they cultivated cells. The micropost system allowed engineers to modulate the rigidity and flexibility of the substrate surface without changing the adhesive or other material surface properties that could affect cell growth. Post height determined the degree to which a post would bend in response to a cell's horizontal traction force. The system enabled researchers to map cell traction forces to individual focal adhesions and spatially quantify sub-cellular distributions of focal-adhesion area, traction force and focal-adhesion stress.

The research, published in the current issue of the journal Nature Methods, demonstrated that the height of the posts determined the flexibility of the surface substrate, which in turn impacted the cell's morphology, leading to differences in focal adhesions, cytoskeletal contractility and stem-cell differentiation. Furthermore, early changes in cytoskeletal contractility measured by the devices predicted lineage fate decisions made days later by the stem cells.

"The library of micropost arrays spanned a more than 1,000-fold range of rigidity from 1.31 nN μm−1 up to 1,556 nN μm−1," said Chris Chen, lead author and the Skirkanich Professor of Innovation in Bioengineering in the School of Engineering and Applied Science at Penn. "Furthermore, the micropost array library will be made available to researchers in other laboratories."

Using current methods, it was not possible to change surface rigidity without also affecting other cellular properties such as the amount of active ligand molecules presented to cells, making it difficult to tease out the precise contributions of rigidity to cellular behavior.

Prior techniques employed the culture of cells on hydrogels derived from natural extracellular matrix proteins at different densities; however, changing densities of the gels impacted not only mechanical rigidity but also the amount of the binding or signaling ligand, leaving uncertainty as to the relevant contribution of these two matrix properties on the observed cellular response. Other synthetic hydrogels have been used that can vary rigidity without altering ligand density, but such systems cannot separate whether cells are sensing flexibility of individual molecules or of the macroscale mechanics.

"Although hydrogels will continue to be important in characterizing and controlling cell-material interactions, alternative approaches are necessary to understand how cells sense changes in substrate rigidity," Chen said.

In the body, cells do not exist in isolation but are in constant contact with other cells and with the extracellular matrix, providing structural support as well as both molecular and mechanical signals. In prior research, Chen's team has demonstrated that the push and pull of cellular forces drives the buckling, extension and contraction of cells during tissue development. These processes ultimately shape the architecture of tissues and play an important role in coordinating cell signaling, gene expression and behavior, and they are essential for wound healing and tissue homeostasis in adult organisms.


'/>"/>

Contact: Jordan Reese
jreese@upenn.edu
215-573-6604
University of Pennsylvania
Source:Eurekalert  

Related biology news :

1. Cellular mechanical forces may initiate angiogenesis
2. Scientists create artificial human skin with biomechanical properties using tissue engineering
3. Small mechanical forces have big impact on embryonic stem cells
4. Company Granted Patent on Apparatus, Systems, and Methods for Gathering and Processing Wireless Biometric and Biomechanical Data
5. Clemson researchers advance nano-scale electromechanical sensors
6. Flemish researchers provide the first experimental evidence of dynamic allostery in protein regulation
7. Remote control for cholesterol regulation discovered in brain
8. New computational method to uncover gene regulation
9. New data on the regulation of a protein that is altered in all cancers
10. Rewiring of gene regulation across 300 million years of evolution
11. Gene regulation: Can we stomach it?
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Mechanical regulation of cell substrates effects stem cell development, adhesion
(Date:4/26/2016)... DUBLIN , April 27, 2016 ... of the  "Global Multi-modal Biometrics Market 2016-2020"  report ... ) , The analysts forecast ... a CAGR of 15.49% during the period 2016-2020.  ... a number of sectors such as the healthcare, ...
(Date:4/13/2016)... 13, 2016  IMPOWER physicians supporting Medicaid patients in ... new clinical standard in telehealth thanks to a new ... higi platform, IMPOWER patients can routinely track key health ... mass index, and, when they opt in, share them ... to a local retail location at no cost. By ...
(Date:3/22/2016)... India , March 22, 2016 /PRNewswire/ ... market research report "Electronic Sensors Market for Consumer ... Proximity, & Others), Application (Communication & IT, ... Geography - Global Forecast to 2022", published ... industry is expected to reach USD 26.76 ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... , June 24, 2016 Epic ... sensitively detects cancers susceptible to PARP inhibitors by ... tumor cells (CTCs). The new test has already ... therapeutics in multiple cancer types. Over ... DNA damage response pathways, including PARP, ATM, ATR, ...
(Date:6/23/2016)... June 23, 2016   Boston Biomedical , ... compounds designed to target cancer stemness pathways, announced ... granted Orphan Drug Designation from the U.S. Food ... gastric cancer, including gastroesophageal junction (GEJ) cancer. Napabucasin ... to inhibit cancer stemness pathways by targeting STAT3, ...
(Date:6/23/2016)...  The Prostate Cancer Foundation (PCF) is pleased to announce 24 ... for prostate cancer. Members of the Class of 2016 were selected from a ... Read More About the Class of 2016 PCF Young Investigators ... ... ...
(Date:6/23/2016)... (PRWEB) , ... June 23, 2016 , ... In a ... Hospital in Denmark detail how a patient who developed lymphedema after being treated for ... The results could change the paradigm for dealing with this debilitating, frequent side effect ...
Breaking Biology Technology: