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Related Experiment Videos

The calpain system in human placenta.

Valery F Thompson1, Sandra Saldaña, Jinyang Cong

  • 1Muscle Biology Group, University of Arizona, Tucson, AZ 85721, USA. valery.thompson@arizona.edu

Life Sciences
|August 14, 2002
PubMed
Summary

Human placenta is a valuable source of mu-calpain and m-calpain, crucial for understanding diseases like Alzheimer's. This study characterizes these calpains and their inhibitor, calpastatin, found in placenta extracts.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Human Pathophysiology

Background:

  • The calpain system plays a role in various human diseases, including muscular dystrophies and Alzheimer's disease.
  • Characterizing mu-calpain and m-calpain from human tissues is essential for research.
  • A readily available source for human m-calpain has been lacking.

Purpose of the Study:

  • To identify and characterize mu-calpain and m-calpain from human placenta.
  • To investigate the properties of calpastatin in placenta extracts.
  • To determine the calcium (Ca2+) requirements for placenta mu- and m-calpain activity.

Main Methods:

  • Extraction and purification of calpains and calpastatin from human placenta.
  • Ion-exchange chromatography for protein separation.

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  • Enzyme activity assays to determine calcium sensitivity.
  • Western blot analysis to identify protein isoforms.

    • Main Results:

    • Human placenta contains significant amounts of both mu-calpain (3-4 mg/1000g) and m-calpain (4-5 mg/1000g).
    • Placenta extracts contain calpastatin, which interferes with calpain purification and activity assays.
    • Placenta mu-calpain requires 50-70 microM Ca2+ and m-calpain requires 450-460 microM Ca2+ for half-maximal activity.
    • Western analysis revealed distinct calpastatin isoforms (48-51 kDa and 70 kDa) in placenta.

    Conclusions:

    • Human placenta is a viable source for both mu-calpain and m-calpain.
    • Placenta calpastatin presents purification challenges but exists in at least two isoforms.
    • Understanding placenta calpain and calpastatin is important for studying calpain-related pathologies.