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Francisco Alvarez

Happy birthday, spinal cord neurons

Congratulations to JoAnna Anderson, postdoctoral fellow in Francisco Alvarez’ lab, for winning the Best Image contest, part of the Postdoctoral Research Symposium taking place Thursday. We will have explanations of the second and third place images Thursday and Friday.

The brief description of Anderson’s image is: “EdU birthdating of V1 inhibitory interneurons in the postnatal day 5 lumbar spinal cord.” But how did all those colors get in there and what do they mean? Alvarez explains:

The work is about finding the times of neurogenesis of the many inhibitory neurons that pattern motor output in the ventral horn of the spinal cord, so that our muscles contract in a coordinated manner to achieve the desired movements.

For example, when one muscle contracts, the muscle with the opposite action on the same joint will be inhibited. Anderson and her fellow postdoc Andre Rivard have been studying the development of the V1 neurons that carry out this inhibition.

AndersonJoAnnaThe image shows a slice of a 5 day old mouse’s spinal cord, and we can see individual cells. Some of the neurons are producing fluorescent proteins: one of the proteins is red, the other is green, and where both proteins are present, a yellow or orange color can be seen. The red and the green colors are indicators for two genes, Engrailed-1 and FoxP2, respectively, both of which regulate neurons’ development.

In addition, the white spots at the top come from EdU (5-ethynyl-2’-deoxyuridine), a chemical that impersonates a building block of DNA well enough to get incorporated into cells when they are dividing. It is helpful to remember that neurons are cells that have stopped dividing. Giving embryos a pulse of EdU is a way to mark the point at which progenitor cells mature and become neurons.

By repeating the experiment at different dates, the researchers can see that FoxP2 positive green cells are generated after the FoxP2 negative red cells. Both types of cells are derived from the same progenitors, but in different cell cycles. Read more

Posted on by Quinn Eastman in Neuro Leave a comment

Six beautiful images — choose your favorites

WoodruffMatthew1

Matthew Woodruff — Bali Pulendran lab

ImageJ=1.48g unit=micron

Kenneth Myers — James Zheng lab

Joshua_Strauss_OPE_Image

Joshua Strauss — Elizabeth Wright lab

AndersonJoAnna

JoAnna Anderson — Francisco Alvarez lab

AlexTamas

Alexey Tamas — Charles Searles lab

Emory’s Office of Postdoctoral Education is holding a Best Image contest. The deadline to vote is this Thursday, April 30. You can look at these beautiful images (and guess exactly what they are, based on what lab they come from), but to VOTE, you need to go to the OPE site.

This is part of the run up to their Postdoctoral Research Symposium at the end of May.

(Hat tip to Ashley Freeman in Dept of Medicine!)

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Posted on by Quinn Eastman in Uncategorized Leave a comment