Crossref journal-article
Rockefeller University Press
The Journal of Experimental Medicine (291)
Abstract

Agents that restore vascular patency in stroke also increase the risk of intracerebral hemorrhage (ICH). As Factor IXa is a key intermediary in the intrinsic pathway of coagulation, targeted inhibition of Factor IXa–dependent coagulation might inhibit microvascular thrombosis in stroke without impairing extrinsic hemostatic mechanisms that limit ICH. A competitive inhibitor of native Factor IXa for assembly into the intrinsic Factor X activation complex, Factor IXai, was prepared by covalent modification of the Factor IXa active site. In a modified cephalin clotting time assay, in vivo administration of Factor IXai caused a dose-dependent increase in time to clot formation (3.6-fold increase at the 300 μg/kg dose compared with vehicle-treated control animals, P < 0.05). Mice given Factor IXai and subjected to middle cerebral artery occlusion and reperfusion demonstrated reduced microvascular fibrin accumulation by immunoblotting and immunostaining, reduced 111In-labeled platelet deposition (42% decrease, P < 0.05), increased cerebral perfusion (2.6-fold increase in ipsilateral blood flow by laser doppler, P < 0.05), and smaller cerebral infarcts than vehicle-treated controls (70% reduction, P < 0.05) based on triphenyl tetrazolium chloride staining of serial cerebral sections. At therapeutically effective doses, Factor IXai was not associated with increased ICH, as opposed to tissue plasminogen activator (tPA) or heparin, both of which significantly increased ICH. Factor IXai was cerebroprotective even when given after the onset of stroke, indicating that microvascular thrombosis continues to evolve (and may be inhibited) even after primary occlusion of a major cerebrovascular tributary.

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Choudhri, T. F., Hoh, B. L., Prestigiacomo, C. J., Huang, J., Kim, L. J., Schmidt, A. M., Kisiel, W., Connolly, E. S., & Pinsky, D. J. (1999). Targeted Inhibition of Intrinsic Coagulation Limits Cerebral Injury in Stroke without Increasing Intracerebral Hemorrhage. The Journal of Experimental Medicine, 190(1), 91–100.

Authors 9
  1. Tanvir F. Choudhri (first)
  2. Brian L. Hoh (additional)
  3. Charles J. Prestigiacomo (additional)
  4. Judy Huang (additional)
  5. Louis J. Kim (additional)
  6. Ann Marie Schmidt (additional)
  7. Walter Kisiel (additional)
  8. E. Sander Connolly (additional)
  9. David J. Pinsky (additional)
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Dates
Type When
Created 23 years ago (July 26, 2002, 12:48 p.m.)
Deposited 2 years ago (July 25, 2023, 5:55 a.m.)
Indexed 11 months, 2 weeks ago (Sept. 9, 2024, 2:38 a.m.)
Issued 26 years, 1 month ago (July 1, 1999)
Published 26 years, 1 month ago (July 1, 1999)
Published Online 26 years, 1 month ago (July 5, 1999)
Published Print 26 years, 1 month ago (July 1, 1999)
Funders 0

None

@article{Choudhri_1999, title={Targeted Inhibition of Intrinsic Coagulation Limits Cerebral Injury in Stroke without Increasing Intracerebral Hemorrhage}, volume={190}, ISSN={1540-9538}, url={http://dx.doi.org/10.1084/jem.190.1.91}, DOI={10.1084/jem.190.1.91}, number={1}, journal={The Journal of Experimental Medicine}, publisher={Rockefeller University Press}, author={Choudhri, Tanvir F. and Hoh, Brian L. and Prestigiacomo, Charles J. and Huang, Judy and Kim, Louis J. and Schmidt, Ann Marie and Kisiel, Walter and Connolly, E. Sander and Pinsky, David J.}, year={1999}, month=jul, pages={91–100} }