Polyunsaturated Fatty Acids in Multiple Sclerosis and Rheumatoid Arthritis

Multiple Sclerosis

The combined data of three clinical trials in MS with Linoleic Acid alone showed reduced relapse rate and severity, and in mildly affected MS a decrease in long term progression. Furthermore, three pilot clinical trials using lipid treatments in MS, where GLA was an important component, have shown significant reductions in relapse rate and improvement in neurological status i.e., improvement of neurological disability scores.

In addition, there is evidence, based on both its known biological functions i.e., when metabolised to its longer chain fatty acids and from studies in MS patients, that GLA can improve cognitive function. Over a dozen published scientific research papers beginning in the early 1970’s have shown that circulating and cellular lipids in Multiple Sclerosis (MS) patients have a disturbed Omega-6 fatty acid pattern. This disturbed Omega-6 fatty acid metabolism in MS is thought by some scientists to lead to dysregulated immune-inflammatory processes as well as loss of specific fatty acids e.g., arachidonic acid which are required by neurones for brain health. 

Clinical Studies

High dose borage oil slows progression
High dose borage oil reduced relapse rate

Over an 18-month period, patients taking a high dose selected borage oil (high in Sn2 GLA) showed significant and marked improvement in Expanded Disability Status Scale (EDSS) score, and markedly reduced rate of relapse, symptomatic relief of muscle spasticity and painful sensory symptoms, and improved objective measures of cognitive functions. Low dose was without effect.

Patients taking the high dose selected Sn2 borage oil maintained their level of immune cell production of anti-inflammatory TGF-β1 during the trial period. Their pro-inflammatory cytokines TNF-α and IL-1β were significantly and markedly (<70%) reduced. In parallel they maintained the membrane long chain omega-6 fatty acids, dihomo-γ-linolenic acid (DGLA) and arachidonic acid (AA). In contrast patients taking the placebo demonstrated loss of omega-6 fatty acids e.g. AA over the course of the trial period.

While immune-suppression would be expected to reduce active lesioning and neuro-degeneration, the sn2 borage maintains key omega-6 membrane fatty acids that are otherwise lost in MS, suggesting a correction of a metabolic defect not otherwise effectively treated by current therapies. These membrane long chain omega-6 fatty acids (AA and 22:4 n-6) are also required by the brain and are known as brain selective fatty acids.

Some of the initial clinical trial details were published in the British Journal of Nutrition (2007), 98, Suppl. 1, S46-S53.

Rheumatoid arthritis

Lower risk as well as clinical improvement of Rheumatiod Arthritis (RA) has been linked to both the dietary intake of Omega-6 and Omega-3 fatty acids and their levels in blood. Moreover,  GLA has been extensively studied for its potential to reduce the clinical symptoms of RA. Several clinical trials have demonstrated that GLA can reduce joint pain, swelling, and stiffness in RA patients receiving GLA supplements and were able to show significant overall improvements in disease activity when compared to those RA patients receiving a placebo. Furthermore, the anti-inflammatory effects of GLA are attributed to its ability in RA to inhibit the production of inflammatory cytokines and other inflammatory mediators.