Weibel–Palade body

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Weibel–Palade bodies (WPBs) are the

endothelial cells, the cells that form the inner lining of the blood vessels and heart.[1] They manufacture, store and release two principal molecules, von Willebrand factor and P-selectin, and thus play a dual role in hemostasis and inflammation.[2]

Etymology

Weibel–Palade bodies were initially described by the

Nobel Prize in Physiology and Medicine in 1974 for his work on the function of organelles in cells
.

Constituents

There are two major components stored within Weibel–Palade bodies. One is

leukocytes (white blood cells), allowing them to exit the blood vessel (extravasate) and enter the surrounding tissue, where they can migrate to the site of infection
or injury.

Additional Weibel–Palade body components are the chemokines

.

Production

Multimeric vWF is assembled head-to-head in the Golgi apparatus from tail-to-tail vWF dimers. vWF multimers condense and twist into long, helical, mostly parallel tubules separated by a less dense matrix of protein domains protruding from the tubules.[9] The Golgi then buds off clathrin-coated vesicles which consist almost exclusively of vWF.

Immature Weibel–Palade bodies remain near the nucleus, where they acquire more membrane proteins and then disperse throughout the cytoplasm, carried along

microtubules by kinesins.[8] Clathrin-coated vesicles bud from immature Weibel–Palade bodies, reducing their volumes, condensing their contents, and removing select membrane proteins. Maturing Weibel–Palade bodies may also fuse with each other.[9]

The only parallel organelle in physiology is the alpha granule of platelets, which also contains vWF. Weibel–Palade bodies are the main source of vWF, while α-granules probably play a minor role.

Secretion

The small subset of Weibel–Palade bodies tethered at the cell periphery to the actin cortex serve as a readily releasable pool that's replenished by a larger pool of microtubule-associated bodies in the cell interior.[8]

The contents of Weibel–Palade bodies are secreted by one of three mechanisms.

fuse transiently to the plasma membrane in a "lingering kiss" that opens a pore large enough for only their smaller cargo (e.g. IL-8, CD63) to diffuse out.[9] Weibel–Palade bodies may also coalesce into larger vesicles called secretory pods for multigranular exocytosis.[9] Secretory pod formation is mediated by interposition of tiny nanovesicles between bodies. As Weibel–Palade bodies fuse with secretory pods, their vWF cargo loses its tubular form for spaghetti-like strings that are then exocytosed through a fusion pore.[9] Whether cargo besides vWF is exocytosed from secretory pods or selectively retained is uncertain. Different modes of cargo release from Weibel–Palade bodies may be a mechanism for differential release of subsets of molecules in different physiological conditions.[9]

During secretion, the vWF molecules fuse together into the final concatamer "strings".[10]

Clinical significance

The importance of Weibel–Palade bodies are highlighted by some human disease mutations. Mutations within vWF are the usual cause of the most common inherited bleeding disorder,

platelets at a site of injury, and is also important in secondary hemostasis, acting as a chaperone for coagulation factor VIII (FVIII).[11]

See also

References

External links