Ji-Young Bae, a graduate student in the laboratory of Dr. Young-Hee Kang, presented results of the two-part study on Tuesday, April 21, at the Experimental Biology 2009 meeting in New Orleans. The presentation was part of the scientific program of the American Society for Nutrition.
Ellagic acid is an antioxidant found in numerous fruits, vegetables and nuts, especially raspberries, strawberries, cranberries and pomegranates. Earlier studies have suggested it has a photoprotective effect.
But how? The Kang laboratory found that, in human skin cells, ellagic acid worked to protect against UV damage by blocking production of MMP (matrix metalloproteinase enzymes that break down collagen in damaged skin cells) and by reducing the expression of ICAM (a molecule involved in inflammation).
The scientists then turned to young (four weeks), male, hairless mice - genetically bred types of mice often used in dermatology studies because of the physiological similarities of their skin to that of humans. For eight weeks, the 12 mice were exposed to increasing ultraviolet radiation, such as that found in sunlight, three times a week, beginning at a level sufficient to cause redness or sunburn and increasing to a level that would have definitely caused minor skin damage to human skin.
During these eight weeks, half of the exposed mice were given daily 10 microM topical applications of ellagic acid on their skin surface, even on the days in which they did not receive UV exposure. The other mice, also exposed to UV light, did not receive ellagic acid. (Another six mice served as controls, with neither UV exposure nor ellagic acid.)
What happened? First, as expected, the mice exposed to UV radiation without the ellagic acid treatment developed wrinkles and thickening of the skin.
Second, as hypothesized, the exposed mice that received topical application of ellagic acid showed reduced wrinkle formation.
Third, as suggested in the study of human cells, the ellagic acid reduced inflammatory response and MMP secretion due to protection from the degradation of collagen. The ellagic acid also helped prevent an increase of epidermal thickness
The researchers say the results demonstrate that ellagic acid works to prevent wrinkle formation and photo-aging caused by UV destruction of collagen and inflammatory response.
In addition to Ji-Young Bae and Dr. Young-Hee Kang, co-authors were Jung-Suk Choi, Sang-Wook Kang, Dong Shoo Kim, and Jung Lye Kim. The research was supported by the Korea Research Foundation and Brain Korea 21.
Sylvia Wrobel | EurekAlert!
Further reports about: > Antioxidant > Ellagic acid > Experimental Biology > ICAM > Korea > MMP > UV radiation > UV skin damage > antioxidant ellagic acid > collagen destruction > human skin cells > inflammatory response > matrix metalloproteinase enzymes > skin cell > skin of hairless mice > ultraviolet radioactive rays
Monitoring the heart's mitochondria to predict cardiac arrest?
21.09.2017 | Boston Children's Hospital
Highly precise wiring in the Cerebral Cortex
21.09.2017 | Max-Planck-Institut für Hirnforschung
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
21.09.2017 | Physics and Astronomy
21.09.2017 | Life Sciences
21.09.2017 | Health and Medicine