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Related Experiment Videos

Post-mortem changes in calmodulin binding proteins in muscle and lung.

Susey Kang1, Nishma Kassam, Mona L Gauthier

  • 1Department of Zoology, University of Toronto at Mississauga, Mississauga, Ont, Canada L5L 1C6.

Forensic Science International
|February 19, 2003
PubMed
Summary

Calmodulin binding proteins (CaMBPs) show stable levels for up to 96 hours post-mortem, with specific proteins like calcineurin A (CNA) and Ca(2+)/CaM-dependent kinase II (CaMKII) exhibiting predictable changes useful for estimating post-mortem intervals (PMI).

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Area of Science:

  • Forensic Science
  • Biochemistry
  • Molecular Biology

Background:

  • Estimating the post-mortem interval (PMI) is crucial in forensic investigations but remains challenging.
  • Calmodulin (CaM) binding proteins (CaMBPs) are involved in cellular signaling and may offer insights into post-mortem changes.

Purpose of the Study:

  • To investigate the potential of CaMBPs as reliable indicators for estimating PMI.
  • To analyze the stability and changes in CaMBP levels in rat lung and skeletal muscle tissues over time post-mortem.

Main Methods:

  • Calmodulin binding overlay technique (CaMBOT) was used to detect whole CaMBP populations.
  • Immunoblot analysis was performed on specific CaMBPs: Ca(2+)/CaM-dependent kinase II (CaMKII), calcineurin A (CNA), myristoylated alanine-rich C-kinase substrate (MARCKS), and inducible nitric oxide synthase (iNOS).

Related Experiment Videos

  • Samples were analyzed at 0, 24, 48, and 96 hours post-mortem at 21°C.

    • Main Results:

    • The overall CaMBP population remained stable for up to 96 hours post-mortem.
    • MARCKS levels decreased steadily, while CNA showed a mobility shift and then decreased in lung tissue.
    • CaMKII levels were stable in both lung and skeletal muscle tissues over the 96-hour period.

    Conclusions:

    • Specific CaMBPs, particularly CNA and CaMKII, demonstrate predictable patterns of change post-mortem.
    • These findings support the further investigation of CNA and CaMKII as potential biomarkers for estimating both short- and long-term PMIs.