Resveratrol, a naturally occurring polyphenol compound produced by the skin of red grapes and peanuts, and found in red wine, has been touted as a beneficial supplement due to its anti-inflammatory and antioxidant properties.
This has been supported by some experimental studies, whereas others suggest a lack of benefit. A new study using two multiple sclerosis (MS) models published in The American Journal of Pathology has found that resveratrol actually worsened MS-like neuropathology and inflammation and had no neuroprotective effects.
"Resveratrol may have detrimental effects in some disease conditions and should be discouraged for supplemental use by MS patients pending further research," says lead investigator Ikuo Tsunoda, MD, PhD, Assistant Professor in the Department of Microbiology and Immunology, Center for Molecular & Tumor Virology of the Louisiana State University Health Sciences Center, Shreveport, LA.
Investigators (Fumitaka Sato, PhD, et al) tested resveratrol in autoimmune and viral models of MS. In the autoimmune model, experimental autoimmune encephalomyelitis (EAE) was induced in 6-week-old mice using myelin oligodendrocyte glycoprotein (MOG)35-55 peptide. Mice were fed either a control diet or a diet containing resveratrol for 2 months or only during the early (days -1 to 8) or the late (days 14 to 23) phases of EAE. Around 12 days after MOG sensitization, all groups started to develop clinical signs, such as tail and hind limb paralysis, and the symptoms worsened and peaked by 3 weeks. After 5 weeks, mice fed the control diet showed either complete recovery or mild paralysis, but all three groups fed resveratrol exhibited severe and lasting EAE without remission.
Spinal cord neuropathology showed higher pathology scores in demyelination, meningitis, perivascular cuffing (inflammation), and overall pathology in mice that had been given resveratrol during the early phase compared with mice fed a control diet, whereas mice treated with resveratrol during the entire treatment period had significantly higher pathology scores in meningitis and overall pathology than controls. Groups did not differ in brain pathology scores.
Although it has been suggested that resveratrol has anti-inflammatory properties, in this study resveratrol did not suppress autoimmune responses as measured by levels of MOG35-55-specific lymphoproliferative responses and pro-inflammatory cytokine production.
To see whether resveratrol had anti-viral properties, as has been reported, 5-week-old mice were infected intracerebrally with the Daniels (DA) strain of Theiler's murine encephalomyelitis virus (TMEV) to induce TMEV-induced demyelinating disease (TMEV-IDD). The mice were fed either a control diet or one containing resveratrol from days 35 to 48 (the chronic phase). Similar to the findings from the EAE model, mice treated with resveratrol developed significantly more severe TMEV-IDD compared with the controls. Another study using the GDVII strain of TMEV to see whether resveratrol could suppress neurodegeneration caused by direct viral infection, not by immunopathology, found that resveratrol had no neuroprotective activity against the virus.
"Resveratrol did not show anti-viral effects in TMEV infection," says Dr. Tsunoda, although he notes that resveratrol has been shown by others to have anti-viral effects on some viruses related to MS, such as herpes simplex virus and Epstein-Barr virus.
To explain their findings, the authors suggest that resveratrol's vasodilating effects via endothelial cells might enhance infiltration of inflammatory cells into the central nervous system, which in turn might play a key role in the pathogenesis of MS.
The degree to which resveratrol exacerbated demyelination and inflammation surprised the research team. "Our findings illustrate that caution should be exercised for potential therapeutic application of resveratrol in human inflammatory demyelination diseases, including MS," says Dr. Tsunoda.
Eileen Leahy | EurekAlert!
Improving memory with magnets
28.03.2017 | McGill University
Graphene-based neural probes probe brain activity in high resolution
28.03.2017 | Graphene Flagship
The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.
To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
28.03.2017 | Life Sciences
28.03.2017 | Information Technology
28.03.2017 | Physics and Astronomy