There is growing evidence that adipose tissue plays a key role in the aggravation of COVID-19. One of the theories under investigation is that fat cells (adipocytes) act as a reservoir for SARS-CoV-2 and increase viral load in obese or overweight individuals. Scientists also suspect that during infection fat cells release into the bloodstream substances that boost the inflammatory reaction triggered by the virus in the organism. These hypotheses are being investigated by researchers at the University of São Paulo's Medical School (FM-USP) in Brazil under the coordination of Marilia Cerqueira Leite Seelaender (https://bv.fapesp.br/en/pesquisador/5631/marilia-cerqueira-leite-seelaen...), PhD, a Professor in the Department of Clinical Surgery. Peter Ratcliffe, MD, PhD, a Professor at the University of Oxford in the UK and one of the winners of the 2019 Nobel Prize for Physiology or Medicine (“for discoveries of how cells sense and adapt to oxygen availability”), is collaborating. "A cytokine storm resulting in systemic inflammation similar to sepsis occurs in some severe COVID-19 patients. We believe these inflammatory factors come from adipose tissue. It's been shown that when adipocytes expand too much, they can cause inflammation throughout the body, even in the brain," Dr. Seelaender told Agência FAPESP (news agency). The FM-USP group analyzed samples of adipose tissue obtained from autopsies of people who died from COVID-19, and also from patients infected with SARS-CoV-2 who had to be submitted to emergency surgery at the university's hospital for appendicitis or other reasons not related to the viral infection. Preliminary results confirmed that the virus can be found in fat cells, whose membranes are rich in ACE-2, the main receptor used by the virus to invade human cells. The researchers have yet to confirm that once it has invaded adipocytes, it can remain there long enough to replicate inside them. "It's worth noting that visceral adipocytes [located deep in the abdomen and around internal organs] have much more ACE2 than subcutaneous adipose tissue," Dr. Seelaender said. "In addition, they're much more inflammatory. As a result, visceral obesity tends to be even more harmful as far as COVID-19 is concerned."
EXOSOME SECRETION & HYPOXIA
The preliminary findings also brought to light a change in the pattern of exosome secretion in the adipose tissue of infected people. Exosomes (highlighted by yellow arrows in image, which is more fully explained below) are extracellular vesicles, comparable to tiny bubbles, released by cells into the bloodstream and often containing proteins and other types of signaling molecules, as well as informational molecules such as various RNAs. This is one of the mechanisms whereby information is exchanged between different tissues as the body adapts to changes in its environment.
The aims of the research conducted by the FM-USP group include investigating whether infection by SARS-CoV-2 makes adipocytes release more exosomes containing inflammatory factors. So far, the group has shown that the number of vesicles released into the bloodstream does indeed increase. The researchers will now analyze the contents of these circulating vesicles, as well as those remaining inside cells. They also plan to investigate the inflammatory pathways presumably activated by these molecules.
"We first assumed that as a person gets fat, their adipose tissue becomes hypoxic, meaning the person has less oxygen available. Hypoxia is itself a cause of inflammation, so one of the things we want to investigate is whether COVID-19 causes hypoxia in adipocytes," Dr. Seelaender said.
Research on how human cells adapt to hypoxia won Dr. Ratcliffe the 2019 Nobel Prize, together with William G. Kaelin (Harvard University) and Gregg Semenza (Johns Hopkins School of Medicine).
Sir Radcliffe's group is now interested in exploring the possibility that the SARS-CoV-2 virus interacts with hypoxia signaling pathways, and the Brazilian and British groups are collaborating to address this hypothesis.
INFECTION EFFECTS ON ADIPOSE TISSUE
The FM-USP group in Brazil, meanwhile, is concentrating on an effort to understand the effect of infection on adipose tissue. "We're analyzing everything secreted by fat cells: proteins, saturated fatty acids, prostaglandins (lipids with diverse hormone-like effects), microRNAs (small non-coding RNA molecules that regulate gene expression) and exosomes," Dr. Seelaender said.
HYPOTHESIS THAT ADIPOSE TISSUE IN OBESE COVID-19 PATIENTS UNDERGOES PROCESS SIMILAR TO CACHEXIA, A WASTING SYNDROME ASSOCIATED WITH CANCER AND OTHER DISEASES
Inflammatory factors released by adipose tissue in COVID-19 patients may be the cause of damage to the heart, lungs, and nervous system described in such patients, she added. "Our hypothesis is that obese COVID-19 patients undergo a similar process to that observed in the adipose tissue of patients with cachexia (significant rapid weight loss and muscle wasting associated with AIDS, heart failure, and cancer, among other diseases)," she said. "Adipocytes in cachexic individuals release more exosomes, and their contents are altered so that they have a pro-inflammatory profile. We know there's inflammation in both cachexia and obesity. The difference lies in the type of inflammatory mediator released and the signaling pathways activated."
Dr. Seelaender and her group have been researching the links between cachexia and inflammation since 2013 with FAPESP's support (https://bv.fapesp.br/en/auxilios/81525/systemic-inflammation-in-cachecti...). The FAPESP is the São Paulo Research Foundation.
OPPOSITE BUT SIMILAR
In an article published online on September 25, 2020 in Advances in Nutrition (https://academic.oup.com/advances/advance-article/doi/10.1093/advances/n...), Dr. Seelaender and her group discuss how nutritional status can influence a patient's response to COVID-19. According to the authors, both obesity and malnutrition--including cachexia and sarcopenia (loss of skeletal muscle mass associated with aging)--can impair the immune response and prevent the organism from combating viral infection. The article is titled “Coronavirus Disease 2019 (COVID-19) and Nutritional Status: The Missing Link?”
"Immune cells require more energy during an infectious process, especially if the body takes a long time to overcome it. Their metabolism needs to change so that they can multiply rapidly, but in an undernourished organism, this isn't possible. During an infection the number of T-lymphocytes in a malnourished individual is much smaller than in a eutrophic (well-nourished) individual," Dr. Seelaender said.
Moreover, she continued, undernourished organisms suffer from atrophy of the lymphoid organs (especially bone marrow, thymus, and lymph nodes), in which the lymphocytes are produced and reach maturity. As a result, the number of circulating defense cells declines. Experiments with animals have also shown that an organism suffering from malnutrition takes longer to eliminate viruses.
"Fat can be a problem when it's excessive or insufficient. However paradoxical it may seem, both extremes are dangerous," she explained. "Adipose tissue secretes leptin, a hormone that regulates T-lymphocyte metabolism. Leptin signaling falls in a body with very low fat. Excessively high fat makes cells less sensitive to leptin, so the amount of leptin released rises sharply."
Aging affects several of the factors mentioned by Dr. Seelaender. The immune system becomes less responsive. Skeletal muscle mass dwindles, visceral fat increases, and the proportion between lean and fat mass worsens.
"Loss of lean mass can worsen the outcome of chronic and acute diseases in older people. Muscle is a reservoir of energy substrate (amino acids) that can be mobilized at times of need, such as during an infection," she said. "That's why it's important to stress that not just adiposity, but also the lean-to-fat mass ratio, is a problem in COVID-19 patients. If a person has a lot of fat and little muscle, it's worse than if they have a lot of fat but a good muscular condition."
SÃO PAULO RESEARCH FOUNDATION (FAPESP)
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