Over 80 percent of COVID-19 patients have vitamin D deficiency
Vitamin D deficiency was more prevalent in men
October 27, 2020
Science Daily/The Endocrine Society
Over 80 percent of 200 COVID-19 patients in a hospital in Spain have vitamin D deficiency, according to a new study published in the Endocrine Society's Journal of Clinical Endocrinology & Metabolism.
Vitamin D is a hormone the kidneys produce that controls blood calcium concentration and impacts the immune system. Vitamin D deficiency has been linked to a variety of health concerns, although research is still underway into why the hormone impacts other systems of the body. Many studies point to the beneficial effect of vitamin D on the immune system, especially regarding protection against infections.
"One approach is to identify and treat vitamin D deficiency, especially in high-risk individuals such as the elderly, patients with comorbidities, and nursing home residents, who are the main target population for the COVID-19," said study co-author José L. Hernández, Ph.D., of the University of Cantabria in Santander, Spain. "Vitamin D treatment should be recommended in COVID-19 patients with low levels of vitamin D circulating in the blood since this approach might have beneficial effects in both the musculoskeletal and the immune system."
The researchers found 80 percent of 216 COVID-19 patients at the Hospital Universitario Marqués de Valdecilla had vitamin D deficiency, and men had lower vitamin D levels than women. COVID-19 patients with lower vitamin D levels also had raised serum levels of inflammatory markers such as ferritin and D-dimer.
Other authors of the study include: Daniel Nan, José M. Olmos, Javier Crespo, and Víctor M. Martínez-Taboada of the University of Cantabria; Marta Fernandez-Ayala, Mayte García-Unzueta, Miguel A. Hernández-Hernández, Marcos López-Hoyos, Manuel Gutiérrez-Cuadra, and Juan J. Ruiz-Cubillán of the Hospital Marqués de Valdecilla-IDIVAL in Santander, Spain; Pedro Muñoz Cacho of the Servicio Cántabro de Salud in Santander, Spain;
https://www.sciencedaily.com/releases/2020/10/201027092216.htm
Vitamin D study sheds light on immune system effects
April 17, 2019
Science Daily/University of Edinburgh
Scientists have uncovered fresh insights into how vitamin D affects the immune system and might influence susceptibility to diseases such as multiple sclerosis.
Vitamin D is produced by the body in response to sunlight and is often lauded for its health benefits. Researchers found it also affects key cells of the immune system.
This discovery might explain how vitamin D regulates immune reactions that have been implicated in autoimmune diseases such as MS.
The University of Edinburgh team focused on how vitamin D affects a mechanism in the body's immune system -- dendritic cells' ability to activate T cells.
In healthy people, T cells play a crucial role in helping to fight infections. In people with autoimmune diseases, however, they can start to attack the body's own tissues.
By studying cells from mice and people, the researchers found vitamin D caused dendritic cells to produce more of a molecule called CD31 on their surface and that this hindered the activation of T cells.
The team observed how CD31 prevented the two cell types from making a stable contact -- an essential part of the activation process -- and the resulting immune reaction was far reduced.
Researchers say the findings shed light on how vitamin D deficiency may regulate the immune system and influence susceptibility to autoimmune diseases.
The study, published in Frontiers in Immunology, was funded by the Medical Research Council, Biotechnology and Biological Sciences Research Council, Natural Environment Research Council and Wellcome.
Professor Richard Mellanby, of the University of Edinburgh's Centre for Inflammation Research, said: "Low vitamin D status has long being implicated as a significant risk factor for the development of several autoimmune diseases. Our study reveals one way in which vitamin D metabolites can dramatically influence the immune system."
https://www.sciencedaily.com/releases/2019/04/190417111440.htm