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Cathepsin H from human placenta.

G Sawicki1, M Warwas

  • 1Department of Pharmaceutical Biochemistry, Medical Academy, Wroclaw, Poland.

Acta Biochimica Polonica
|January 1, 1989
PubMed
Summary

Researchers isolated human Cathepsin H using various chromatography techniques. This cysteine protease exhibits optimal activity at pH 6.8 and is inhibited by cystatins, suggesting its role in placental physiology.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Human Physiology

Background:

  • Cathepsin H is a cysteine protease implicated in various cellular functions.
  • Understanding its properties in specific human tissues is crucial for physiological and pathological studies.
  • Human placenta is a rich source of enzymes, but Cathepsin H characterization remains incomplete.

Purpose of the Study:

  • To isolate and characterize Cathepsin H from human placenta.
  • To determine the enzyme's molecular weight, charge heterogeneity, and substrate specificity.
  • To investigate the enzyme's stability and inhibition profile.

Main Methods:

  • Enzyme isolation via autolysis, acetone fractionation, and multiple chromatography steps (DEAE-cellulose, Sephadex G-75, hydroxyapatite, concanavalin A-Sepharose).
  • Molecular weight determination using SDS-polyacrylamide gel electrophoresis.
  • Isoelectric focusing for pI analysis.
  • Enzyme activity assays with protein and naphthylamide substrates.
  • Stability studies across pH range and temperature.
  • Inhibition assays with known cysteine protease inhibitors and cystatins.

Main Results:

  • Cathepsin H was successfully isolated from human placenta.
  • SDS-PAGE revealed two molecular weight bands (Mr 25,500 and 28,500).
  • Isoelectric focusing identified two active forms with pI values of 6.0 and 6.45.
  • The enzyme demonstrated stability between pH 5-7.5 and was inactivated at 50°C.
  • Optimal substrate hydrolysis occurred with arginine-beta-naphthylamide at pH 6.8.
  • Inhibition was observed with cysteine protease inhibitors and placental cystatins.

Conclusions:

  • Human placental Cathepsin H is a heterogeneous enzyme with distinct molecular forms.
  • Its substrate specificity and stability profile provide insights into its physiological role.
  • Inhibition by cystatins highlights potential regulatory mechanisms in the placenta.

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