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Vitamin D deficiency linked to metabolic changes in patients with lupus - study

2021-03-26
(Press-News.org) Patients with lupus are more likely to have metabolic syndrome and insulin resistance - both factors linked to heart disease - if they have lower vitamin D levels, a new study reveals.

Researchers believe that boosting vitamin D levels may improve control of these cardiovascular risk factors, as well as improving long-term outcomes for patients with systemic lupus erythematosus (SLE).

Given that photosensitivity is a key feature of SLE, the scientists say that a combination of avoiding the sun, using high-factor sunblock and living in more northerly countries may contribute to lower levels of vitamin D in lupus patients. Patients with more severe disease also had lower vitamin D levels.

An international research team, led by experts at the University of Birmingham and University of Manchester, studied vitamin D levels in 1,163 SLE patients across 33 centres in 11 countries (UK, USA, Canada, Spain, The Netherlands, Sweden, Iceland, Switzerland, Turkey, South Korea and Mexico), publishing its findings in Rheumatology.

Report co-author Dr John A Reynolds, Clinical Senior Lecturer in Rheumatology at the University of Birmingham, commented: "Our results suggest that co-existing physiological abnormalities may contribute to long-term cardiovascular risk early on in SLE.

"We found a link between lower levels of vitamin D and metabolic syndrome and insulin resistance. Further studies could confirm whether restoring vitamin D levels helps to reduce these cardiovascular risk factors and improve quality of life for patients with lupus."

Lupus is an uncommon incurable immune system illness, more common in women, where the immune system is overactive, causing inflammation anywhere in the body. Untreated, the condition threatens irreversible damage to major organs including kidneys, heart, lungs and brain.

Metabolic syndrome is a combination of diabetes, high blood pressure (hypertension), abnormal cholesterol levels, and obesity. People with metabolic syndrome are at greater risk of getting coronary heart disease, stroke and other conditions affecting the blood vessels.

The researchers note that patients with SLE have an excess cardiovascular risk, up to 50 times that seen in people without the condition - this cannot be attributed to traditional cardiovascular risk factors, such as high blood pressure or smoking, alone.

The mechanisms underlying the association between high blood pressure and low vitamin D in SLE are not clear, but researchers believe they may be linked to impact of vitamin D deficiency on the renin-angiotensin hormone system, which regulates blood pressure, fluid and electrolyte balance, as well as systemic vascular resistance.

"This is the largest-ever study examining associations between vitamin D levels and metabolic syndrome in SLE; it also has the advantage of being an international cohort with diverse racial and ethnic backgrounds - generating results that will be applicable across many settings," commented Dr. Reynolds.

INFORMATION:

For further information, interviews or an embargoed copy of the research paper, please contact Tony Moran, International Communications Manager, University of Birmingham on +44 (0)782 783 2312 or t.moran@bham.ac.uk. Out-of-hours +44 (0) 7789 921 165.

Notes for editors

The University of Birmingham is ranked amongst the world's top 100 institutions. Its work brings people from across the world to Birmingham, including researchers, teachers and more than 6,500 international students from over 150 countries.

'Lower vitamin D is associated with metabolic syndrome and insulin resistance in systemic lupus: data from an international inception cohort' - Christine Chew, John A Reynolds, et al is published by Rheumatology.

Research partners included: University of Manchester; Sandwell and West Birmingham NHS Trust, Birmingham; University of Birmingham; Northwestern University, Chicago; Toronto Western Hospital Centre for Prognosis Studies in the Rheumatic Diseases; Université Laval, Quebec;Hanyang University Hospital for Rheumatic Diseases,Seoul; University of Calgary; McGill University, Montreal; Queen Elizabeth II Health Sciences Centre, Halifax, Canada; University College London; Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran, Mexico; Oklahoma Medical Research Foundation Arthritis and Clinical Immunology Research Program, Department of Clinical Pharmacology, Oklahoma City, OK, USA; Cedars-Sinai Medical Center, Los Angeles; SUNY Downstate Medical Center College of Medicine, Brooklyn, NY; King's College London; Lunds University, Sweden; National University Hospital of Iceland; Allegheny Health Network, Lupus Center of Excellence, Pittsburgh; University of California; University of North Carolina at Chapel Hill; Johns Hopkins University, Baltimore; Northwell Health Feinstein Institutes for Medical Research, Manhasset, NY; Amsterdam University Medical Centres; Kantonsspital Schaffhausen, Switzerland; The University of Alabama at Birmingham; Emory University School of Medicine, Atlanta; Hospital Universitario Cruces, Barakaldo, Spain; University of Manitoba, Winnipeg; Columbia University, New York; Medical University of South Carolina; Istanbul University; and Central Manchester University Hospitals NHS Foundation Trust;



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[Press-News.org] Vitamin D deficiency linked to metabolic changes in patients with lupus - study