News ID: 208613
Published: 0235 GMT January 23, 2018

Anemia discovery offers new targets to treat fatigue in millions

Anemia discovery offers new targets to treat fatigue in millions
medicalxpress.com

A new discovery from the University of Virginia School of Medicine has revealed an unknown clockwork mechanism within the body that controls the creation of oxygen-carrying red blood cells.

The finding sheds light on iron-restricted anemias that leave millions of people weak, tired and unable to concentrate — and it may point the way to better treatments as well, medicalxpress.com reported.

 

Understanding anemia

 

Adam Goldfarb, MD, and his colleagues made the discovery while seeking to better understand why iron-restricted anemias cause the body to create insufficient numbers of vital red blood cells.

Members of the research team were working independently on what would prove to be key pieces of the puzzle, but it was only when they put them together that they could see the big picture.

Shadi Khalil, who worked in Goldfarb's lab, was examining bone marrow cells when he noticed something intriguing about them.

"I thought it was beautiful. I just stood there at the microscope looking at these cells."

What caught his eye was that the cells contained large pools of the receptor for erythropoietin, a hormone that directs the bone marrow to make red blood cells.

The hormone, known as EPO, has been used by Lance Armstrong and other athletes as a performance-enhancing drug.

To do its job receiving the instruction to make blood cells, the receptor must be on the outside of the marrow cells. Yet so much was stored up inside them.

Perhaps, Khalil thought, this might explain why some people's bone marrow cells fail to follow the hormone's instructions. And it did, partly. But there was still a piece missing, and, it would turn out, a colleague in the lab had already found it.

 

Parallel research

 

Researcher Lorrie Delehanty was studying anemia using a model the lab developed — ‘anemia in a dish’, the scientists call it.

Delehanty said, "If you drop the iron level way down, these cells act like anemic cells. They basically become anemic cells — they even look very pale.

“Something else happens and a particular protein disappeared.”

The Scribble protein (named after the SCRIB gene that produces it) proved to be a key piece of the clockwork mechanism.

Basically, it works like this: The amount of iron in the blood affects the amount of the Scribble protein available and Scribble controls whether the hormone receptor is welled up inside the bone marrow cells or doing its job on the outside.

Khalil said, "We realized that this was kind of a complicated symphony that starts with iron and ultimately controls how much and what kind of messages the cells get.”

The researchers used this knowledge to fix EPO resistance in their model, and they hope the discovery will eventually be useful for treating anemias in people, too.

 

   
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