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Related Experiment Videos

Tumor necrosis factor-induced necrosis: a monocyte-mediated hypercoagulable effect

C R Spillert1, S Sun, R Ponnudurai

  • 1Department of Surgery, University of Medicine and Dentistry of New Jersey-New Jersey Medical School, Newark 07103-2757, USA.

Journal of the National Medical Association
|July 1, 1995
PubMed
Summary

Tumor necrosis factor (TNF) can cause tissue necrosis, but requires incubation. TNF alone does not activate blood clotting; monocyte activation is necessary for TNF to induce hypercoagulability and thrombosis.

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Area of Science:

  • Immunology
  • Hematology
  • Oncology

Background:

  • The precise mechanisms underlying tumor necrosis factor's (TNF) necrotic effects remain unclear.
  • A proposed pathway involves TNF-induced monocyte activation, leading to tissue factor production and subsequent hypercoagulability.
  • This hypercoagulable state may result in thrombotic vascular occlusion and tissue necrosis.

Purpose of the Study:

  • To investigate the role of TNF in inducing procoagulant activity and tissue necrosis.
  • To determine if TNF alone, or in conjunction with monocyte activation, causes hypercoagulability.

Main Methods:

  • Modified recalcification time assays were performed on blood samples.
  • Samples were treated with albumin (control), endotoxin-containing saline, or albumin with TNF (450 units).

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  • The effect of incubation time on procoagulant activity was assessed.
  • Main Results:

    • No significant differences in recalcification times were observed between the groups without incubation.
    • Incubation was required for TNF to exhibit any effect on the blood samples.
    • TNF alone, without prior monocyte activation, did not demonstrate procoagulant activity.

    Conclusions:

    • Tumor necrosis factor (TNF) can induce tissue necrosis, but this effect is dependent on incubation.
    • TNF itself lacks direct procoagulant activity.
    • Monocyte activation is a critical prerequisite for TNF to initiate a procoagulant cascade leading to thrombosis and necrosis.