Inflammation

, Volume 16, Issue 1, pp 57–68 | Cite as

Effects of combination of tumor necrosis factor alpha and chemotactic peptide, f-met-leu-phe, on phagocytosis of opsonized microspheres by human neutrophils

  • James D. Ogle
  • J. Greg Noel
  • R. Michael Sramkoski
  • Cora K. Ogle
  • J. Wesley Alexander
Original Articles

Abstract

Pretreatment of normal, human neutrophils with 8 units/ml of TNF-α followed by treatment with 10−8 M FMLP resulted in a synergistic effect of the combination of the two mediators on the enhancement of the phagocytic capacity of the cells. This enhancement of phagocytosis occurred without an additional increase in the upregulation of C3b receptors (CR1) beyond that caused by each mediator alone. Pretreatment of the cells with 8 units/ml of TNF-α followed by 10−6 M FMLP resulted in an additive effect of the mediators on neutrophil phagocytosis, again without an additional up-regulation of CR1. This additive effect resulted in an increase in phagocytic capacity of the neutrophils greater than that obtained by treatment of the cells with 10−6 M FMLP alone, which heretofore has resulted in the greatest enhancement of phagocytic capacity obtained by any pretreatment condition. These synergistic and additive effects of the combination of mediators could be of great importance in host defense against bacterial infections and have important implications regarding the mechanisms of receptor upregulation and phagocytosis.

Keywords

Peptide Tumor Necrosis Tumor Necrosis Factor Synergistic Effect Important Implication 

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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • James D. Ogle
    • 1
    • 3
  • J. Greg Noel
    • 3
  • R. Michael Sramkoski
    • 3
  • Cora K. Ogle
    • 2
    • 3
  • J. Wesley Alexander
    • 2
    • 3
  1. 1.Department of Molecular Genetics, Biochemistry and MicrobiologyUniversity of Cincinnati Medical CenterCincinnati
  2. 2.Department of SurgeryUniversity of Cincinnati Medical CenterCincinnati
  3. 3.Shriners Burns InstituteCincinnati

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