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Wegener autoantigen and myeloblastin are encoded by a single mRNA

C Labbaye1, P Musette, Y E Cayre

  • 1Department of Physiology and Cellular Biophysics, Columbia University College of Physicians and Surgeons, New York, NY 10032.

Proceedings of the National Academy of Sciences of the United States of America
|October 15, 1991
PubMed

Insights

Myeloblastin and proteinase 3, both serine proteases, are encoded by a single mRNA. This finding clarifies their relationship in human leukemia cells and neutrophils, impacting cancer research.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hematology

Background:

  • Myeloblastin is a serine protease found in HL-60 leukemia cells.
  • Proteinase 3, a neutrophil serine protease, is the Wegener autoantigen.
  • High homology suggests myeloblastin and proteinase 3 may be identical.

Purpose of the Study:

  • To investigate the relationship between myeloblastin and proteinase 3.
  • To determine if myeloblastin and proteinase 3 are encoded by the same gene.
  • To analyze the expression of proteinase 3 mRNA in leukemia cells.

Main Methods:

  • 5'-terminal nucleotide sequencing of proteinase 3.
  • Analysis of mRNA expression in HL-60 cells and patient samples.
  • Demonstration of single mRNA encoding both proteins.

Main Results:

  • Proteinase 3 mRNA is expressed in HL-60 cells and acute myeloid leukemia patient cells.
  • Myeloblastin and proteinase 3 are encoded by a single mRNA.
  • Confirms the identity of myeloblastin and proteinase 3.

Conclusions:

  • Myeloblastin and proteinase 3 are the same serine protease.
  • This finding has implications for understanding leukemia and autoimmune diseases like Wegener's.
  • Identifies a key target for therapeutic intervention in certain leukemias.

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