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Lipids archive

 

Australian lipid study finds connection to multiple sclerosis disability(15/05/14)

Disability in those with multiple sclerosis (MS) can vary in different ways for the millions of people with it all across the globe and no one had been able to figure out why. Researchers in Australia now believe they know why and they are accusing serum lipids and apolipoproteins in Wednesday’s ‘before print’ release of their study.

Lipids are molecules that include fats, waxes and vitamins like A, D, E and K and have been seen as playing a very important part in helping cells communicate. Serum lipids are defined as the blood fats that have influence on metabolism and apolipoproteins are the proteins that function as the carriers of lipids through the circulatory and lymphatic systems.

Blood samples were taken from 178 MS patients from southern Tasmania, Australia from 2002 to 2005 so that researchers could measure the patients’ lipid profiles and apolipoproteins levels. The patients’ blood was drawn at the beginning of the study and then again at the biannual reviews.

Along with taking blood samples, each patient was examined to see if there were any changes in their disability. Actual disease progression was looked at too but there was no mention of an MRI to measure lesions or plaques but they did use the Expanded Disability Status Scale (EDSS).

The EDSS provides a way for doctors to score the levels of disability a patient has according to eight ‘functional systems’ and most MS patients have under gone the test at one time or another. The scale includes motor function, cerebellar (brain), brain stem, sensory, bowel and bladder, visual, mental and, what can be called a miscellaneous catch-all area; ‘other’.

After adjustments were made for cholesterol totals and body weights, they were able to see there were adverse lipid profiles according to disability. According to the researchers, “total cholesterol (TC) (p = 0.037), apolipoprotein B (ApoB) (p = 0.003), and the apolipoprotein B to apolipoprotein A-I ratio (ApoB/ApoA-I ratio) (p = 0.018) were independently associated with a higher EDSS.” [see abstract link below]

The next logical step would be to find ways to improve serum lipid levels and though there have been studies on working with adverse lipids, at this point there hasn’t been a pointed-in-this-direction kind of help and it is not sure when that could be happening. Especially since doctors still don’t have a strong line on what levels are clearly ‘good’ or ‘bad’; it might take awhile.

Abstract  

Sources: Examiner.com & Science Direct Copyright © 2014 Elsevier B.V. (15/05/14)

Could 'good' cholesterol protect against MS?(13/11/13)

A protein found in HDL, or ''good,'' cholesterol may help protect against the effects of multiple sclerosis, according to new research.

In the study, patients with MS had much lower levels of the protein than did healthy people, says study researcher Lidia Gardner, PhD. She is an assistant professor of neurology at the University of Tennessee Health Science Center.

Those with more severe forms of MS, known as progressive, had even lower levels of the protein than those with a 'milder' form called relapsing-remitting. The protein is known as ApoA1.

ApoA1 is the main component of HDL. It is known to protect the body from inflammation.

In MS patients, inflammation occurs when the body's immune system attacks cells of the brain, spinal cord, and optic nerve.

Gardner presented the findings at the Society for Neuroscience's annual meeting in San Diego.

"I think it's an interesting preliminary study that has potential [applications] for people living with MS,'' says Bruce Bebo, PhD. He is associate vice president of discovery research for the National Multiple Sclerosis Society. He was not involved in the study.

Comparing Protein Levels in Patients

Gardner and her team took blood samples from four groups. They included a group without MS and a group for each of the three forms of MS.

Compared to those without MS, all the MS patients had lower levels of the cholesterol protein. This was true no matter what type of MS they had. It was reduced by 25% in people with relapsing remitting MS, 50% in people with secondary progressive MS, and 75% in people with primary progressive MS.

Conflicting Discoveries

"I think you have to take the findings with some caution, because they are very preliminary," Bebo says.

Other research has looked at prescribing cholesterol-lowering drugs, known as statins, to increase good cholesterol in MS patients. The studies have produced conflicting findings, Gardner says.

She plans to focus next on the process of making and then increasing ApoA1 to help.

For now, lifestyle changes such as eating a vegetarian, vegan, or low-fat diet may help boost levels of the cholesterol protein, Gardner says. Exercise may also help.

Source: WebMD ©2005-2013 WebMD, LLC (13/11/13)

Replacing fatty acids may fight MS

By delving into the components of protective nerve coatings that get damaged in multiple sclerosis, scientists have identified a handful of lipid molecules that appear to be attacked by an immune system run amok.

Bolstering the supply of these lipids might help preserve these nerve coatings and, in the process, knock back the inflammation that contributes to their destruction, researchers report in the June 6 Science Translational Medicine.

In MS patients, rogue antibodies assault myelin, the fatty sheath that insulates nerves and facilitates signaling. Inflammation exacerbates the attack on myelin and the cells that make it. But other details of MS, including the roles of myelin lipids, have been less clearly understood.

“I think this is a very good study,” says Francisco Quintana, an immunologist at Harvard Medical School. “Overall, there are not many papers on lipids in MS. Technically, they are challenging and require a lot of expertise.”

To explore the role of lipids, the researchers studied spinal fluid from people with MS, healthy people and patients with other neurological disorders. Tests on the fluid showed that antibodies targeted four lipids more often in MS patients than in the other groups. Examination of autopsied brains from MS patients and people without MS revealed that, in the MS patients, these four lipids were depleted at the sites where the nerve coatings were damaged.

A nerve needs an intact myelin sheath to conduct signals. “It short-circuits if they are not there,” says study coauthor Lawrence Steinman, a neurologist at Stanford University. This nerve damage causes loss of muscle control and other symptoms characteristic of MS.

Steinman and his colleagues conducted tests in mice with a condition similar to MS and found that injections of the lipids over several weeks could limit severity of the disease and even reverse some symptoms in the animals. The four lipids — abbreviated as PGPC, azPC, azPC ester and POPS — share a similar phosphate group, to which the rogue antibodies bind.

Other tests in mice showed that side chains of fatty acids, attached to the lipids like fingers on a glove, “keep the myelin-making cells alive and reduce the inflammatory response,” Steinman says. “It turns out that the side chains are imbued with protective properties.” They repel inflammation and even kill the T cells that trigger it, the researchers found.

It could be that people with MS, who lack adequate supplies of these lipids and their protective fatty acids, fail to keep up with the destruction caused by antibodies and inflammation. But that dismal numbers game might present an opening for future research, Steinman says. Just as the mice benefited from receiving extra lipids, human patients might, too. And some tests now show that mice can take the lipids orally and still improve, he adds.

Quintana says that further animal studies will be needed to clarify the full effects of giving lipids to fight MS. “But it could potentially lead to some kind of therapy.”

Joan Goverman, an immunologist at the University of Washington in Seattle, says the researchers deserve credit for their approach. “Looking at humans and then going back and incorporating that in animal models is a powerful way to understand the disease.”

Source: Science News © Society for Science & the Public 2000 - 2012 (07/06/12)