Scientists discover an unexpected influence on dividing stem cells' fate

Scientists discover an unexpected influence on dividing stem cells' fate

When most cells divide, they simply make more of themselves. But stem cells, which are responsible for repairing or making new tissue, have a choice: They can generate more stem cells or differentiate into skin cells, liver cells, or virtually any of the body's specialized cell types.

As reported February 3 in Science, scientists at The Rockefeller University have discovered that this pivotal decision can hinge on whether or not tiny organ-like structures, organelles, are divvied up properly within the dividing stem cell.

"In order for the body's tissues to develop properly and maintain themselves, renewal and differentiation must be carefully balanced," says senior author Elaine Fuchs, the Rebecca C. Lancefield Professor and head of the Robin Chemers Neustein Laboratory of Mammalian Cell Biology and Development. "Our experiments suggest an unexpected role for the positioning and inheritance of cellular organelles, in this case enzyme-filled peroxisomes, in controlling this intricate balance."

An uneven division

The outer section of the skin, the epidermis, provides a protective barrier for the body, and stem cells reside deep within it. During development, these cells divide so that one renewing stem cell daughter remains inward while the other daughter differentiates and moves outward to become part of the epidermis' outer layers. First author Amma Asare, a graduate student in the lab, wanted to know how skin cells first emerge and begin this transition.

Looking in developing mouse skin, Asare devised an approach to identify genes that help guide the balance between new cells that either stay stem-like or differentiate. One particular protein, Pex11b, caught her attention. It is associated with the membrane that surrounds the peroxisome, an organelle that helps to free energy from food.

Asare showed that the protein seems to work by making sure the organelles are in the right locations so they can be divided between the daughter cells. In cells that lacked Pex11b, peroxisomes weren't divvied up evenly -- in some cases, one daughter cell ended up with all of the peroxisomes and the other didn't get any at all. And for those cells whose peroxisome distribution was disrupted, cell division took longer, and the mitotic spindle, the structure that separates the daughters' genetic material, didn't align correctly.

The net result of depleting skin stem cells of Pex11b, Asare found, was that fewer daughter cells were able to differentiate into mature skin cells.

A delay changes fate

The researchers next moved peroxisomes around in the cell using a sophisticated laboratory technique, and the effect was the same. "If the peroxisomes are in the wrong positions during cell division, no matter how they get there, that slows down the process," Asare says.

The effect for the whole organism was dramatic: If peroxisome positioning was disrupted in the stem cells, the mice embryos could no longer form normal skin.

"While some evidence already suggested the distribution of organelles, including energy-producing mitochondria, can influence the outcome of cell division, we have shown for the first time that this phenomenon is essential to the proper behavior of stem cells and formation of the tissue," says Fuchs, who is also a Howard Hughes Medical Institute Investigator.



Add Comment

all comments

  Other news

more
Glastonbury to open with minute's silence

Glastonbury to open with minute's silence..

23-Jun, 01:51

The Glastonbury Festival will open with a minute's silence on Friday...

British population shows sharpest growth since 1947  ONS

British population shows sharpest growth since 1947 ONS..

22-Jun, 12:06

The population of Britain grew by 538,000 in a single year, according to...

Switchable DNA mini-machines store information

Switchable DNA mini-machines store information..

22-Jun, 15:38

Biomedical engineers have built simple machines out of DNA, consisting of...

Find out which royal just launched their own clothing line!

Find out which royal just launched their own clothing line!..

23-Jun, 04:13

Pauline has launched her own clothing line Photo: Altered features...

Melissa Etheridge admits she's smoked pot with her 2 grown children

Melissa Etheridge admits she's smoked pot with her 2 grown children..

17-Apr, 10:57

Melissa Etheridge thinks it's silly that there's still a stigma around...

Energetic Backstreet Boys bring the nostalgia to ACM Awards

Energetic Backstreet Boys bring the nostalgia to ACM Awards..

09-Apr, 05:18

While Justin Timberlake had a show-stopping moment alongside Chris...

Meet the real-life Darth Vader who lives in Tennessee

Meet the real-life Darth Vader who lives in Tennessee..

04-May, 05:24

Darthvader Williamson is a real person. The 39-year-old of Eads,...

Raphael Bostic tapped to head Atlanta Federal Reserve Bank

Raphael Bostic tapped to head Atlanta Federal Reserve Bank..

13-Mar, 13:14

Raphael W. Bostic, a former Obama administration housing official, has...