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Broccoli Could be Key in the Fight Against Osteoarthritis

Published: Thursday, August 29, 2013
Last Updated: Thursday, August 29, 2013
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A compound found in broccoli could be key to preventing or slowing the progress of the most common form of arthritis.

Results from the laboratory study show that sulforaphane slows down the destruction of cartilage in joints associated with painful and often debilitating osteoarthritis. The researchers found that mice fed a diet rich in the compound had significantly less cartilage damage and osteoarthritis than those that were not.

The study, which also examined human cartilage cells and cow cartilage tissue, was funded by BBSRC's Diet and Health Research Industry Club (DRINC), medical research charity Arthritis Research UK and The Dunhill Medical Trust.

Sulforaphane is released when eating cruciferous vegetables such as Brussels sprouts and cabbage, but particularly broccoli. Previous research has suggested that sulforaphane has anti-cancer and anti-inflammatory properties, but this is the first major study into its effects on joint health.

The researchers discovered that sulforaphane blocks the enzymes that cause joint destruction by stopping a key molecule known to cause inflammation. They wanted to find out if the compound got into joints in sufficient amounts to be effective and their findings are published in the journal Arthritis & Rheumatism.

More than 8.5 million people in the UK have osteoarthritis, a degenerative disease affecting the hands, feet, spine, hips and knees in particular. According to Arthritis Research UK, the annual cost of the condition to the NHS is £5.2 billion. In 2011, more than 77,000 knee and 66,000 hip replacements were carried out due to osteoarthritis - approximately one every four minutes.

Aging and obesity are the most common contributors to the condition and due to their effects, the number of people in the UK consulting a GP about knee osteoarthritis alone could rise from 4.7 million in 2010 to 8.3 million by 2035. Currently one in five people over the age of 45 has osteoarthritis in their knee. There is no cure or effective treatment for the disease other than pain relief, which is often inadequate, or joint replacement.

The study involved researchers from UEA's schools of Biological Sciences, Pharmacy and Norwich Medical School, along with the University of Oxford and Norfolk and Norwich University Hospital.

Researchers from the School of Biological Sciences and Norwich Medical School are now embarking on a small scale trial in osteoarthritis patients due to have knee replacement surgery, to see if eating broccoli has similar effects on the human joint. If successful, they hope it will lead to funding for a large scale clinical trial to show the effect of broccoli on osteoarthritis, joint function and pain itself.

Ian Clark, Professor of Musculoskeletal Biology at UEA and the lead researcher, said: "The results from this study are very promising. We have shown that this works in the three laboratory models we have tried, in cartilage cells, tissue and mice. We now want to show this works in humans. It would be very powerful if we could.

"As well as treating those who already have the condition, you need to be able to tell healthy people how to protect their joints into the future. There is currently no way in to the disease pharmaceutically and you cannot give healthy people drugs unnecessarily, so this is where diet could be a safe alternative.

"Although surgery is very successful, it is not really an answer. Once you have osteoarthritis, being able to slow its progress and the progression to surgery is really important. Prevention would be preferable and changes to lifestyle, like diet, may be the only way to do that."

Prof Clark added: "Osteoarthritis is a major cause of disability. It is a huge health burden but a huge financial burden too, which will get worse in an increasingly aging and obese population such as ours.

"This study is important because it is about how diet might work in osteoarthritis. Once you know that you can look at other dietary compounds which could protect the joint and ultimately you can advise people what they should be eating for joint health. Developing new strategies for combating age-related diseases such as osteoarthritis is vital, both to improve the quality of life for sufferers and to reduce the economic burden on society."

Arthritis Research UK's medical director Prof Alan Silman said: "This is an interesting study with promising results as it suggests that a common vegetable, broccoli, might have health benefits for people with osteoarthritis and even possibly protect people from developing the disease in the first place.

"Until now research has failed to show that food or diet can play any part in reducing the progression of osteoarthritis, so if these findings can be replicated in humans, it would be quite a breakthrough. We know that exercise and keeping to a healthy weight can improve people's symptoms and reduce the chances of the disease progressing, but this adds another layer in our understanding of how diet could play its part."

For the small scale trial, funded by DRINC, half the 40 patients will be given 'super broccoli' - bred to be high in sulforaphane - to eat for two weeks before their operation. Once the surgery has taken place the researchers will look at whether the compound has altered joint metabolism and if it can be detected in the replaced joints.

'Sulforaphane represses matrix-degrading proteases and protects cartilage from destruction in vitro and in vivo' by Rose Davidson, Orla Jupp, Rachel De Ferrars, Colin Kay, Kirsty Culley, Rosemary Norton, Clare Driscoll, Tonia Vincent, Simon Donell, Yongping Bao and Ian Clark was published in Arthritis & Rheumatism on Wednesday August 28.

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