Health Observance

Cholesterol Education Month 2021

Research highlights: genes, bears and bugs (of the viral variety)
Courtney Chandler
Sept. 1, 2021

While cholesterol may have a bad rep, it is necessary for human health — it gives your body the building blocks it needs to make cells, hormones and vitamins. Cholesterol becomes a problem when there's too much of it circulating in your bloodstream. As cholesterol levels increase, so does the risk for developing diseases such as heart disease and stroke, two leading causes of death in the U.S.

Around 10% of adults in the U.S. have high total cholesterol levels. Much research has focused on better understanding how cholesterol is made and trafficked in our body, oftentimes with the goal of developing better diagnostic tools and treatments to prevent disease. Here, I’ve rounded up some of the most recent research on cholesterol in honor of Cholesterol Education Month.

Gene variants that impair cholesterol clearance

High density lipoprotein and its primary receptor, called scavenger receptor class B type I, or SR-BI, work together to clear excess cholesterol from the bloodstream, thus protecting against fatty plaque buildup in the arteries. Humans have different genetic variants of SR-BI, some of which have been identified in patients with high levels of HDL and cholesterol. Researchers from Medical College of Wisconsin recently published their work on a specific SR-BI variant associated with cardiovascular disease in the Journal of Lipid Research. They found that this variant, which has a cysteine residue at amino acid position 174 instead of an arginine and is thus called R174C-SR-BI, had impaired cholesterol transport in monkey cells. If these results translate to humans, this variant could be a risk factor for impaired cholesterol clearance and cardiovascular disease. Genetic screening may help physicians better identify patients with this variant and develop better treatment plans.

What bears can tell us about cholesterol

Recent insights into cholesterol research focused on an unexpected group of fuzzy animals — bears. Specifically, Swedish brown bears. Earlier this year, ASBMB Today's Arti Dumbrepatil wrote about how a team of researchers compared human and bear lipoproteins to try to understand why hibernating bears can withstand elevated levels of cholesterol and triglycerides without developing clogged arteries, whereas humans can’t. Their research, also published in the Journal of Lipid Research, found that bear lipoproteins differ in structure and function, which results in less binding to the walls of arteries and thus less fatty plaque buildup. To learn more, read Dumbrepatil's article.

Reducing cholesterol to block viruses

While cholesterol may be important for our health, it’s also important for the life cycle of other, more nefarious entities. Some types of viruses, called enveloped viruses, emerge from infected human cells in cholesterol-rich lipid rafts. (SARS-CoV-2 is an enveloped virus.) Lowering the levels of cellular cholesterol can impede this process, reducing the ability of these viruses to spread and survive. Researchers from the University of Michigan recently described how an enzyme located to the endoplasmic reticulum, called viperin, exerts its antiviral effects by downregulating cholesterol biosynthesis. After expression, viperin forms a complex with key cholesterol biosynthesis enzymes lanosterol synthetase and squalene monooxygenase. Formation of this complex correlates with a reduction in total cellular cholesterol, possibly through inhibition of those key enzymes, thus preventing of viral budding. This research, published in the Journal of Biological Chemistry, points to control of cholesterol biosynthesis as a means for cells to protect themselves against enveloped viruses. 

Enjoy reading ASBMB Today?

Become a member to receive the print edition monthly and the digital edition weekly.

Learn more
Courtney Chandler

Courtney Chandler is a biochemist and microbiologist in Baltimore, Md., and a careers columnist for ASBMB Today.

Get the latest from ASBMB Today

Enter your email address, and we’ll send you a weekly email with recent articles, interviews and more.

Latest in Science

Science highlights or most popular articles

‘Inert’ ingredients in pesticides may be more toxic to bees than scientists thought
News

‘Inert’ ingredients in pesticides may be more toxic to bees than scientists thought

Dec. 9, 2023

Pesticide users sometimes know very little about how inerts function. That’s partly because they are regulated very differently than active ingredients.

FDA approves CRISPR–Cas9 therapy for sickle cell disease
News

FDA approves CRISPR–Cas9 therapy for sickle cell disease

Dec. 8, 2023

The gene editing treatment from Vertex Pharmaceuticals and CRISPR Therapeutics is the first of its kind

From the journals: MCP
Journal News

From the journals: MCP

Dec. 8, 2023

Metals contaminate protein samples. Lipid droplets go haywire in Huntington’s. Nerve cells respond to stimulation. Read about these recent papers.

The perfect storm
Feature

The perfect storm

Dec. 6, 2023

The world has 2023 Nobel laureates Katalin Karikó, Drew Weissman and others to thank for laying a foundation for the COVID-19 vaccine decades before the pandemic.

Throw your hat in the ring!
Annual Meeting

Throw your hat in the ring!

Dec. 6, 2023

Apply to speak at Discover BMB in Chicago in 2025.

How bacteria inhibit gene expression
Journal News

How bacteria inhibit gene expression

Dec. 5, 2023

Researchers show how altering activity of the transcription factor CarD can cause downregulation and upregulation of some genes.