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Updated: Jun 23, 2026
Detection and Analysis of DNA Damage in Mouse Skeletal Muscle In Situ Using the TUNEL Method
Published on: December 16, 2014
Microwave cell death: molecular analysis using DNA electrophoresis, PCR amplification and TUNEL
Ichiro Mori1, Takashi Ozaki, Katsuyoshi Tabuse
1Department of Pathology, Wakayama Medical University, Wakayama City, Wakayama, Japan.
Abstract:
Microwave cell death (MCD) is unique in that microscopic morphology and antigenicity are well preserved, while enzymatic activity is lost. The aim of the present study was to carry out DNA electrophoresis, polymerase chain reaction (PCR) amplification and terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) examination of MCD. DNA electrophoresis indicated only a thick band of large DNA immediately after microwave treatment, which became a smear 6 h later and indicated a delayed type of DNA degradation over 2 weeks. Neither a DNA smear characteristic of oncosis nor DNA ladder patterns characteristic of apoptosis were found in MCD. PCR of p53 in MCD showed a single band at the same level of control of non-microwave treated cells. MCD was negatively stained on TUNEL. These results provide further evidence that MCD is distinct from oncosis and apoptosis, in addition to showing unique morphological and antigenic preservation and enzymatic inactivation.
Insights
Microwave cell death (MCD) preserves cell structure but inactivates enzymes. DNA analysis confirms MCD is distinct from apoptosis and oncosis, showing delayed DNA degradation without characteristic patterns.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Microwave cell death (MCD) is characterized by preserved morphology and antigenicity but lost enzymatic activity.
- Understanding the molecular mechanisms distinguishing MCD from other cell death types is crucial.
Purpose of the Study:
- To investigate DNA integrity and specific molecular markers in Microwave cell death (MCD).
- To differentiate MCD from oncosis and apoptosis using molecular techniques.
Main Methods:
- DNA electrophoresis to assess DNA fragmentation patterns.
- Polymerase Chain Reaction (PCR) amplification of the p53 gene.
- Terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) assay for DNA breaks.
Main Results:
- DNA electrophoresis showed delayed DNA degradation in MCD, distinct from oncosis (smear) and apoptosis (ladder).
- PCR analysis of p53 revealed no significant alterations in MCD compared to controls.
- TUNEL staining was negative in MCD, indicating absence of significant DNA strand breaks.
Conclusions:
- Microwave cell death (MCD) represents a unique mode of cell death, distinct from oncosis and apoptosis.
- MCD is characterized by delayed DNA degradation and lack of detectable DNA strand breaks by TUNEL.
- Preserved morphology and antigenicity in MCD are associated with specific molecular events differentiating it from other cell death pathways.
