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Related Experiment Videos

Human monocytes synthesize hyaluronidase.

Nicole Girard1, Catherine Maingonnat, Philippe Bertrand

  • 1Laboratory of Molecular Oncology, Centre Henri-Becquerel, Rouen, France. ngirard@rouen.fnclcc.fr

British Journal of Haematology
|October 3, 2002
PubMed
Summary
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Peripheral blood mononuclear cells (PBMC) possess hyaluronidase activity, primarily linked to the cell membrane. This enzyme can generate active hyaluronic acid fragments, with activity found in myelomonocytic leukemias but not lymphoblastic ones.

Area of Science:

  • Immunology
  • Biochemistry
  • Cell Biology

Background:

  • Hyaluronic acid (HA) oligosaccharides and mononuclear cells are implicated in inflammation.
  • The presence and role of hyaluronidase activity in peripheral blood mononuclear cells (PBMC) remain largely uncharacterized.

Purpose of the Study:

  • To investigate whether peripheral blood mononuclear cells (PBMC) exhibit hyaluronidase activity.
  • To identify the specific PBMC subpopulations responsible for this activity and characterize the enzyme's localization.

Main Methods:

  • Incubation of PBMC with macromolecular-tritiated hyaluronic acid (HA) at pH 3.8.
  • Analysis of supernatants using size exclusion chromatography to detect HA digestion.
  • Characterization of the enzyme's localization through aqueous and detergent extracts of PBMC.

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Main Results:

  • PBMC demonstrated hyaluronidase activity, evidenced by the digestion of HA.
  • The activity was attributed to the CD14-positive, adherent, non-specific esterase-positive subpopulation of PBMC.
  • Hyaluronidase activity (72 kDa) was detected in PBMC extracts, suggesting membrane linkage rather than excretion.
  • Hyaluronidase activity was present in myelomonocytic leukemias but absent in lymphoblastic leukemias.

Conclusions:

  • Monocytes within PBMC possess membrane-associated hyaluronidase(s).
  • This activity can generate bioactive HA fragments in tissues, potentially influencing inflammatory processes.
  • Hyaluronidase activity serves as a potential biomarker distinguishing myelomonocytic from lymphoblastic leukemias.