Tiny particles only billionths of a meter in diameter—about two thousand would fit across the width of a human hair—could offer big hope in a small package to the many millions of people who are allergic to the nickel in everything from jewelry to coins and cell phones, say scientists at Brigham and Women's Hospital (BWH).
In the April 3 online issue of Nature Nanotechnology, the team will report a new approach to preventing the common skin allergy.
Approximately ten to fifteen percent of the US population, or over 30 to 45 million people, plus many more worldwide, are allergic to the nickel found in many everyday objects. For these people the metal causes a red, itchy rash when it comes into contact with their skin. You can see many examples through a quick google search for nickel-induced dermatitis.
However, even though some countries regulate the amount of the metal in certain products to limit exposure, there is no good solution to the problem. "There have been approaches to developing creams with agents that bind the nickel before it can penetrate the skin, but these are not effective in most patients and can even be toxic when the agents themselves penetrate the skin, as most do," says Jeffrey Karp, leader of the work and co-director of the Center for Regenerative Therapeutics at BWH. He adds, "People also sometimes coat their jewelry with nail polish to create a barrier between the skin and nickel ions, but this won't prevent all exposures, such as handling coins or wearing a watch."
Karp, who also holds appointments through Harvard Medical School, Harvard Stem Cell Institute (HSCI), and the Harvard-MIT Division of Health Sciences and Technology (HST), is himself allergic to nickel.
Now he and colleagues including R. Rox Anderson, a dermatologist at Harvard Medical School and Massachusetts General Hospital, have found that nanoparticles containing calcium could offer a safe solution to the problem. When applied to the skin in a cream, the nanoparticles efficiently capture the nickel, preventing it from making its way into the body. Further, the nanoparticles themselves were designed so that they cannot penetrate the skin. The cream with its nickel can then be easily washed off with water.
Says Anderson, "Despite barrier creams, anti-inflammatory drugs, and attempts to avoid nickel, this [metal] is still the most common cause of allergic skin reactions. Nanoparticles that bind to [the nickel] allergens but do not penetrate the skin offer a new strategy. Big hope in a small package!"
"We expect that a person could simply apply the cream just as they would hand cream," says Praveen Kumar Vemula of BWH, HMS, HSCI, and HST. Vemula is first author of the paper.
Toward a Solution
The idea for tackling the problem began when Karp, a specialist on nanoparticles, met Anderson at a dinner. Afterward, Karp sat at his computer thinking about how he could potentially work with the accomplished dermatologist to tackle medical problems. As he pondered, he looked at his hands, which were red and itchy from his nickel allergy. Could he and Anderson find a nontoxic, practical way to prevent nickel from penetrating the skin using nanoparticles?The team began by focusing on compounds containing calcium, which are known to sequester nickel (some are used in the treatment of water). Next, they explored whether these compounds were available as nanoparticles. Karp knew that the tiny particles could potentially allow very efficient nickel capture thanks to their very high surface area.
They found two compounds that met these criteria (calcium carbonate and calcium phosphate), added them to a common emollient to create a cream, and tested them under a variety of experimental conditions. For example, they applied the cream to samples of animal skin and to living animals, and tested it in the presence of artificial sweat (sweat is known to exacerbate the allergy, accelerating the release of nickel). Further, they conducted the tests with concentrations of nickel much higher than would be found in everyday situations.
"We were able to demonstrate that the particles could indeed capture nickel with high efficiency and prevent inflammation in nickel-sensitized animals," Karp says. Further, "we needed 11-fold less nanoparticles to get the same effect" as another common nickel-capture agent. (A significant drawback of the latter: it can penetrate the skin, and even small amounts can cause local and systemic toxicity.)
All results "suggest that nanoparticles can effectively prevent the penetration of nickel into the skin, and may therefore abrogate nickel-induced contact dermatitis," the team concluded in the Nature Nanotechnology paper.
The team has a patent on the work, which was funded by Brigham and Women's Hospital. Vemula is a recipient of an entrepreneur postdoctoral fellowship from the Ewing Marion Kauffman Foundation.
*PHOTO AND IMAGE CAPTIONS
Photo caption: Researchers at Brigham and Women's Hospital (BWH) believe nanoparticles could prevent the itchy, red rash millions suffer from because they are allergic to the nickel found in many everyday objects. Here Praveen Kumar Vemula of BWH and Jeffrey Karp, co-director of the Center for Regenerative Therapeutics at BWH, sit next to a graphic describing their team's approach. Vemula holds a small jar representative of a cream containing the nanoparticles. He points to Karp's finger as an example of where the cream could be applied; many people are exposed to nickel through jewelry like rings. Photo by Donna Coveney.
Image caption: Researchers from Brigham and Women's Hospital (BWH) believe that nanoparticles added to a cream or coated on a nickel-containing object could prevent the itchy redness associated with an allergy to the nickel found in everyday objects like rings. In this cartoon, a nanoparticle cream applied to the ring finger prevents inflammation from the nickel in a ring (brownish particles represent a thin barrier layer of nanoparticles). The forefinger, without the cream, is inflamed after exposure to the ring and its nickel. Courtesy: Praveen Kumar Vemula, Karp lab, BWH
Brigham and Women's Hospital (BWH) is a 793-bed nonprofit teaching affiliate of Harvard Medical School and a founding member of Partners HealthCare, an integrated health care delivery network. BWH is the home of the Carl J. and Ruth Shapiro Cardiovascular Center, the most advanced center of its kind. BWH is committed to excellence in patient care with expertise in virtually every specialty of medicine and surgery. The BWH medical preeminence dates back to 1832, and today that rich history in clinical care is coupled with its national leadership in quality improvement and patient safety initiatives and its dedication to educating and training the next generation of health care professionals. Through investigation and discovery conducted at its Biomedical Research Institute (BRI), BWH is an international leader in basic, clinical and translational research on human diseases, involving more than 900 physician-investigators and renowned biomedical scientists and faculty supported by more than $ 537 M in funding. BWH is also home to major landmark epidemiologic population studies, including the Nurses' and Physicians' Health Studies and the Women's Health Initiative. For more information about BWH, please visit www.brighamandwomens.org.
Holly Brown-Ayers | EurekAlert!
Team discovers how bacteria exploit a chink in the body's armor
20.01.2017 | University of Illinois at Urbana-Champaign
Rabies viruses reveal wiring in transparent brains
19.01.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences