Tracing the start of COVID-19 in GA

At a time when COVID-19 appears to be receding in much of Georgia, it’s worth revisiting the start of the pandemic in early 2020. Emory virologist Anne Piantadosi and colleagues have a paper in Viral Evolution on the earliest SARS-CoV-2 genetic sequences detected in Georgia. Analyzing relationships between those virus sequences and samples from other states and countries can give us an idea about where the first COVID-19 infections in Georgia came from. We can draw Read more

Reddit as window into opioid withdrawal strategies

Drug abuse researchers are using the social media site Reddit as a window into the experiences of people living with opioid addiction. Abeed Sarker in Emory's Department of Biomedical Informatics has a paper in Clinical Toxicology focusing on the phenomenon of “precipitated withdrawal,” in collaboration with emergency medicine specialists from Penn, Rutgers and Mt Sinai. Precipitated withdrawal is a more intense form of withdrawal that can occur when someone who was using opioids starts medication-assisted treatment Read more

CROI: HIV cure report and ongoing research

The big news out of CROI (Conference on Retroviruses and Opportunistic Infections) was a report of a third person being cured of HIV infection, this time using umbilical cord blood for a hematopoetic stem cell transplant. Emory’s Carlos del Rio gave a nice overview of the achievement for NPR this morning. As del Rio explains, the field of HIV cure research took off over the last decade after Timothy Brown, known as “the Berlin patient,” Read more

oxidative phosphorylation

Antibody production: an endurance sport

Antibodies defend us against infections, so they often get described as weapons. And the cells that produce them could be weapon factories?. To understand recent research from immunologist Jerry Boss’s lab, a more appropriate metaphor is the distinction between sprinting and long-distance running.

Graduate student Madeline Price in Boss’s lab has been investigating how antibody-producing cells use glucose – the simple sugar– and how the cells’ patterns of gene activity reflect that usage. Cells can use glycolysis, which is inefficient but fast, analogous to sprinting, or oxidative phosphorylation, generating much more energy overall, more like long distance running.

As Boss and Price point out:

Immunology + Molecular Pathogenesis graduate student Madeline Price

Glycolytic metabolism produces 2 molecules of ATP per molecule of glucose, while oxidative phosphorylation produces 36 molecules of ATP from the same starting glucose molecule. Where oxidative phosphorylation generates more energy from ATP, glycolysis generates metabolic intermediates that are also useful for rapid cellular proliferation.

In their recent paper in Cell Reports, they lay out what happens to B cells, which can go on to become antibody secreting cells (ASCs), after an initial encounter with bacteria. The B cells first proliferate and upregulate both glycolysis and oxidative phosphorylation. However, upon differentiating, the cells shift their preference to oxidative phosphorylation. Read more

Posted on by Quinn Eastman in Immunology Leave a comment