Release and activation of platelet latent TGF-beta in blood clots during dissolution with plasmin.

Abstract:

:Transforming growth factor beta 1 (TGF-beta 1) is a platelet-derived cytokine involved in both normal wound healing and scarring. We show that human platelets contain two pools of latent TGF-beta 1, which constitute more than 95% of the total TGF-beta assayed in whole platelets. During clotting, one pool, the large latent TGF-beta complex consisting of latent TGF-beta binding protein (LTBP), the latency-associated peptide (LAP) and the 25-kD mature TGF-beta 1 dimer is released into the serum. A second pool, which contains LAP but not LTBP, is retained in the clot, but can be released by RGD peptide. When the clot is dissolved by plasmin this bound TGF-beta 1 is gradually activated and released. If similar mechanisms operate in vivo, the clot will act as a slow-release capsule of TGF-beta 1 activity during wound healing.

journal_name

Nat Med

journal_title

Nature medicine

authors

Grainger DJ,Wakefield L,Bethell HW,Farndale RW,Metcalfe JC

doi

10.1038/nm0995-932

subject

Has Abstract

pub_date

1995-09-01 00:00:00

pages

932-7

issue

9

eissn

1078-8956

issn

1546-170X

journal_volume

1

pub_type

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