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Platelet alpha-granule

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Title: Platelet alpha-granule  
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Subject: Granule (cell biology), P-selectin, Eosinophil peroxidase, Platelet storage pool deficiency, Pseudo gray platelet syndrome
Publisher: World Heritage Encyclopedia

Platelet alpha-granule

Alpha granule
Latin granulum alpha
Code TH H2.
Anatomical terminology

In platelets, the term "alpha granules" is used to describe granules containing several growth factors.[1]


  • Contents of alpha-granules 1
  • Clinical significance 2
  • See also 3
  • References 4

Contents of alpha-granules

Contents include insulin-like growth factor 1, platelet-derived growth factors, TGFβ, platelet factor 4 (which is a heparin-binding chemokine) and other clotting proteins (such as thrombospondin, fibronectin, factor V,[2] and von Willebrand factor).[3]

The alpha granules express the adhesion molecule P-selectin[4] and CD63.[5] These are transferred to the membrane after synthesis.

The other type of granules within platelets are called dense granules.

Clinical significance

A deficiency of alpha granules is known as gray platelet syndrome.

See also


  1. ^ Harrison P, Cramer E (1993). "Platelet alpha-granules.". Blood Rev 7 (1): 52–62.  
  2. ^
  3. ^ Nurden AT (2011). "Platelets, inflammation and tissue regeneration" (PDF). THROMBOSIS AND HAEMOSTASIS 105 (Suppl 1): S13–S33.  
  4. ^ Stuart H. Orkin; David G. Nathan; David Ginsburg; A. Thomas Look (2009). Nathan and Oski's hematology of infancy and childhood. Elsevier Health Sciences. pp. 1386–.  
  5. ^ William B. Coleman; Gregory J. Tsongalis (2009). Molecular pathology: the molecular basis of human disease. Academic Press. pp. 258–.  

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