Medical Research Council - London Institute of Medical Sciences

BPoD is 5

In 2017 we celebrate five years of bringing you beautiful imagery from biomedical science

Skin Tight
11 January 2017

Skin Tight

Our skin is vital – it’s a physical barrier against disease. One way it protects us is with a cell layer called the stratum granulosum in which the cells form connections called tight junctions to prevent liquids passing in or out. However, this barrier is only several cells thick and needs to be maintained. Scientists recently found that the cells of the stratum granulosum (pictured) in 3D are a 14-sided shape called Kelvin’s tetrakaidecahedron, formed of six rectangles and eight hexagons. It’s a very effective shape for filling space, so it could help the cells pack together to form the barrier. Using imaging and computer modelling, they also found that the tight junctions move between cells in a very precise way, to make sure that the barrier stays sealed when cells are joining or leaving it. Why this important barrier is only several cells thick, however, remains to be discovered.

Written by Esther Redhouse White

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BPoD stands for Biomedical Picture of the Day. Managed by the MRC London Institute of Medical Sciences the website aims to engage everyone, young and old, in the wonders of biomedicine. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.

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