Parsley and other plants lend form to human stem cell scaffolds – Phys.Org
March 20, 2017 by Terry Devitt Human fibroblast cells, common connective tissue cells, growing on decellularized parsley. A team of UW-Madison researchers from the lab of bioengineering Professor William Murphy is exploring the use of plants to make the three-dimensional structures that may one day be used to repair bone and tissue. Credit: Gianluca Fontana/UW-Madison
Borrowing from nature is an age-old theme in science. Form and function go hand-in-hand in the natural world and the structures created by plants and animals are only rarely improved on by humans.
Taking that lesson to heart, scientists at the University of Wisconsin-Madison are using the decellularized husks of plants such as parsley, vanilla and orchids to form three-dimensional scaffolds that can then be primed and seeded with human stem cells to optimize their growth in the lab dish and, ultimately, create novel biomedical implants.
Writing March 20 in the journal Advanced Healthcare Materials, a team led by William Murphy, a professor of biomedical engineering and co-director of the UW-Madison Stem Cell and Regenerative Medicine Center, describes the use of a variety of plants to create an efficient, inexpensive and scalable technology for making tiny structures that could one day be used to repair muscle, organs and bone using stem cells.
"Nature provides us with a tremendous reservoir of structures in plants," explains Gianluca Fontana, the lead author of the new study and a UW-Madison postdoctoral fellow. "You can pick the structure you want."
The new technology capitalizes on the elegant, efficient structural qualities of plants: strength, rigidity, porosity, low mass and, importantly, surface area. It may help overcome the limitations of current methods such as 3-D printing and injection molding to create feedstock structures for biomedical applications.
"Plants are really special materials as they have a very high surface area to volume ratio, and their pore structure is uniquely well-designed for fluid transport," says Murphy.
The UW-Madison team collaborated with Madison's Olbrich Botanical Gardens and curator John Wirth to identify plant species that could potentially be transformed into the miniature structures useful for biomedical applications. In addition to plants like parsley and orchid, Wirth and colleagues at Olbrich identified bamboo, elephant ear plants and wasabi as plants whose structural qualities may be amenable to creating scaffolds with properties and shapes useful in bioengineering. The team also collected plants such as the wetland-loving bulrush from the UW Arboretum.
"The vast diversity in the plant kingdom provides virtually any size and shape of interest," notes Murphy, who was prompted to explore the plant world after gazing from his office window onto UW-Madison's Lakeshore Nature Preserve. "It really seemed obvious. Plants are extraordinarily good at cultivating new tissues and organs, and there are thousands of different plant species readily available. They represent a tremendous feedstock of new materials for tissue engineering applications."
The new approach to making scaffolds for tissue engineering depends on cellulose, the primary constituent of the cell walls of green plants. The Wisconsin team found that stripping away all of the other cells that make up the plant, and treating the leftover husks of cellulose with chemicals, entices human stem cells such as fibroblastscommon connective tissue cells generated from stem cellsto attach to and grow on the miniature structures.
Stem cells seeded into the scaffolds, according to Fontana, tend to align themselves along the pattern of the scaffold's structure. "Stem cells are sensitive to topography. It influences how cells grow and how well they grow."
That ability to align cells according to the structure of the plant scaffold, adds Murphy, suggests it might be possible to use the materials to control structure and alignment of developing human tissues, a feature critical for nerve and muscle tissues, which require alignment and patterning for their function.
Another critical advantage of the plant scaffolds, notes Murphy, is the apparent ease with which they can be made and manipulated. "They are quite pliable. They can be easily cut, fashioned, rolled or stacked to form a range of different sizes and shapes."
They are also renewable, easy to mass produce and inexpensive.
The scaffolds have yet to be tested in an animal model, but plans are underway to conduct such studies in the near future.
"Toxicity is unlikely, but there is potential for immune responses if these plant scaffolds are implanted into a mammal," says Murphy. "Significant immune responses are less likely in our approach because the plant cells are removed from the scaffolds."
Explore further: New study compares bone-inducing properties of 3-D-printed mineralized scaffolds
More information: Gianluca Fontana et al. Biofunctionalized Plants as Diverse Biomaterials for Human Cell Culture, Advanced Healthcare Materials (2017). DOI: 10.1002/adhm.201601225
A new study of bone formation from stem cells seeded on 3D-printed bioactive scaffolds combined with different mineral additives showed that some of the scaffold mineral composites induced bone-forming activity better than ...
Methicillin-resistant Staphylococcus aureus (MRSA) infections are caused by a type of staph bacteria that has become resistant to the antibiotics used to treat ordinary staph infections. The rise of MRSA infections is limiting ...
Freiburg plant biologist Prof. Dr. Thomas Laux and his research group have published an article in the journal Developmental Cell presenting initial findings on how shoot stem cells in plants form during embryogenesis, the ...
Stem cells are typically thought to have the intrinsic ability to generate or replace specialized cells. However, a team of biologists at NYU showed that regenerating plants can naturally reconstitute their stem cells from ...
The prospect of regenerating bone lost to cancer or trauma is a step closer to the clinic as University of Wisconsin-Madison scientists have identified two proteins found in bone marrow as key regulators of the master cells ...
The word "engineering" can bring to mind images of bridges, spacecraft and even particle colliders. But the human body could use assistance from engineers as well, especially when the natural processes that shape and govern ...
Borrowing from nature is an age-old theme in science. Form and function go hand-in-hand in the natural world and the structures created by plants and animals are only rarely improved on by humans.
Prion diseases are scary, incurable and fatal. They first gained notoriety when cows became infected by prion proteins and, in turn, infected people. Fervor surrounding mad cow disease resulted in the U.S. banning imports ...
Medical devices implanted in the body for drug delivery, sensing, or tissue regeneration usually come under fire from the host's immune system. Defense cells work to isolate material they consider foreign to the body, building ...
Scientists have synthesised the first transparent sample of a popular industrial ceramic at DESY. The result is a super-hard window made of cubic silicon nitride that can potentially be used under extreme conditions like ...
Consumers want fuel-efficient vehicles and high-performance sporting goods, municipalities want weather-resistant bridges, and manufacturers want more efficient ways to make reliable cars and aircraft. What's needed are new ...
A new study has modeled a crucial first step in the self-assembly of cellular structures such as drug receptors and other protein complexes, and found that the flexibility of the structures has a dramatic impact on how fast ...
Please sign in to add a comment. Registration is free, and takes less than a minute. Read more
Follow this link:
Parsley and other plants lend form to human stem cell scaffolds - Phys.Org