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Citations to this article

Platelet alpha-granule fibrinogen, albumin, and immunoglobulin G are not synthesized by rat and mouse megakaryocytes.
P Handagama, … , J Levin, D F Bainton
P Handagama, … , J Levin, D F Bainton
Published October 1, 1990
Citation Information: J Clin Invest. 1990;86(4):1364-1368. https://doi.org/10.1172/JCI114848.
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Research Article

Platelet alpha-granule fibrinogen, albumin, and immunoglobulin G are not synthesized by rat and mouse megakaryocytes.

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Abstract

It has been assumed that endogenous synthesis by the platelet precursor cell, the bone marrow megakaryocyte, is the major source of platelet alpha-granule protein. To test this hypothesis, we used mRNA phenotyping to detect in megakaryocytes the presence of mRNA transcripts specific for various proteins. Our results indicate that megakaryocytes synthesize platelet factor 4, a protein relatively specific for platelets, but do not express mRNA transcripts for the fibrinogen, albumin, or IgG found in alpha-granules. We have previously shown that megakaryocytes endocytose circulating proteins, including fibrinogen, albumin, and IgG, and incorporate them into alpha-granules. Thus, platelets appear to contain a unique type of secretory granule whose contents originate by both endogenous synthesis and endocytosis from plasma. Under basal conditions, the source of alpha-granule fibrinogen is plasma.

Authors

P Handagama, D A Rappolee, Z Werb, J Levin, D F Bainton

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Year: 2024 2021 2020 2018 2017 2016 2014 2013 2010 2009 2008 2006 2005 2003 2001 2000 1999 1998 1996 1995 1994 1993 1992 1990 Total
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