Hemostatic effects of fibrinogen gamma-chain dodecapeptide-conjugated polymerized albumin particles in vitro and in vivo.

Abstract:

BACKGROUND:Prototypes of platelet (PLT) substitutes have been studied and the focus was on a dodecapeptide, HHLGGAKQAGDV (H12), which is a fibrinogen gamma-chain carboxy-terminal sequence (gamma 400-411) and exists only in the fibrinogen domain. STUDY DESIGN AND METHODS:H12 was conjugated to the surface of polymerized albumin particles (polyAlb) as biocompatible and biodegradable particles with a mean diameter of 260 +/- 60 nm, and the hemostatic ability of H12-conjugated polyAlb (H12-polyAlb) under flow conditions and thrombocytopenic rats have been studied. RESULTS:H12-polyAlb enhanced the in vitro thrombus formation of activated PLTs on a collagen-immobilized plate when exposed to the flowing thrombocytopenic imitation blood. Furthermore, the analysis of the tail bleeding time of rats that were made thrombocytopenic by busulfan injection showed that H12-polyAlb had a hemostatic effect. Based on the bleeding time and the amount injected, the hemostatic capacity of 20 H12-polyAlb was estimated to correspond to that of one PLT. CONCLUSION:These results were important first steps toward the development of PLT substitutes and indicated that H12-polyAlb may be a suitable candidate for an alternative to human PLT concentrates transfused into thrombocytopenic patients in the future.

journal_name

Transfusion

journal_title

Transfusion

authors

Okamura Y,Takeoka S,Teramura Y,Maruyama H,Tsuchida E,Handa M,Ikeda Y

doi

10.1111/j.1537-2995.2005.00173.x

subject

Has Abstract

pub_date

2005-07-01 00:00:00

pages

1221-8

issue

7

eissn

0041-1132

issn

1537-2995

pii

TRF00173

journal_volume

45

pub_type

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