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Flipped cells cause blood vessels to leak in diabetes and other diseases

An enzyme activated in diabetics has been found to cause previously aligned cells in a blood vessel to reverse their orientation, creating misalignments that allow veins and arteries to leak three times more blood proteins than normally constructed blood vessels. Controlling the enzyme could ease symptoms of swelling, nerve pain, localized low blood pressure and risk of infection in diabetes, smoking and other diseases that cause blood vessels to leak. The finding stems from a closer examination of the chirality, or "handedness," of cells. Chirality is a property of asymmetry found at all scales of life, from the level of molecules to organisms. Like left and right hands, cells that display chirality are mirror images of one another. The endothelial cells that line the interior of a blood vessel commonly share a right-hand orientation, fitting neatly together to form a semi-permeable barrier that tightly controls the passage of proteins and cells from the bloodstream into the surrounding tissue. But the new research shows that even low levels of the protein kinase C (PKC) -- activated in diseases like diabetes -- in blood vessels can cause some cells to reverse chirality, flipping to left-hand orientation and creating gaps between right- and left-hand cells that increase permeability threefold. This is the first study to move beyond the effects of cell chirality on embryonic development and examine its effects on physiological processes.

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