Alpha granule
| Alpha granule | |
|---|---|
| Details | |
| Part of | Platelets |
| Identifiers | |
| Latin | granulum alpha |
| TH | H2.00.04.1.03005 |
| Anatomical terminology | |
Alpha granules (or α-granules) are a cellular component of platelets. Platelets contain different types of granules that perform different functions, including alpha granules, dense granules, and lysosomes.[1] Of these, alpha granules are the most common.[1] The term "alpha granules" is used to describe granules containing several growth factors.[2]
Contents
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,[3] and von Willebrand factor).[4]
The alpha granules express the adhesion molecule P-selectin[5] and CD63.[6] 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
References
- ^ a b Blair P, Flaumenhaft R (July 2009). "Platelet alpha-granules: basic biology and clinical correlates". Blood Reviews. 23 (4): 177–89. doi:10.1016/j.blre.2009.04.001. PMC 2720568. PMID 19450911.
- ^ Harrison P, Cramer EM (March 1993). "Platelet alpha-granules". Blood Reviews. 7 (1): 52–62. doi:10.1016/0268-960X(93)90024-X. PMID 8467233.
- ^ Whiteheart SW (August 2011). "Platelet granules: surprise packages". Blood. 118 (5): 1190–1191. doi:10.1182/blood-2011-06-359836. PMID 21816838.
- ^ Nurden AT (May 2011). "Platelets, inflammation and tissue regeneration". Thrombosis and Haemostasis. 105 (Suppl 1): S13–33. doi:10.1160/THS10-11-0720. PMID 21479340.
- ^ Orkin SH, Nathan DG, Ginsburg D, Look AT (2009). Nathan and Oski's hematology of infancy and childhood. Elsevier Health Sciences. pp. 1386–. ISBN 978-1-4160-3430-8. Retrieved 2 November 2010.
- ^ Coleman WB, Tsongalis GJ (2009). Molecular pathology: the molecular basis of human disease. Academic Press. pp. 258–. ISBN 978-0-12-374419-7. Retrieved 2 November 2010.
 | This molecular or cell biology article is a stub. You can help Wikipedia by expanding it. |
 | This cardiovascular system article is a stub. You can help Wikipedia by expanding it. |