Related Experiment Videos
Characterization of seven murine caspase family members
M Van de Craen1, P Vandenabeele, W Declercq
1Flanders Interuniversity Institute for Biotechnology and University of Ghent, Belgium.
Abstract:
Seven members of the murine caspase (mCASP) family were cloned and functionally characterized by transient overexpression: mCASP-1 (mICE), mCASP-2 (Ich1), mCASP-3 (CPP32), mCASP-6 (Mch2), mCASP-7 (Mch3), mCASP-11 (TX) and mCASP-12. mCASP-11 is presumably the murine homolog of human CASP-4. Although mCASP-12 is related to human CASP-5 (ICErel-III), it is most probably a new CASP-1 family member. On the basis of sequence homology, the caspases can be divided into three subfamilies: first, mCASP-1, mCASP-11 and mCASP-12; second, mCASP-2; third, mCASP-3, mCASP-6 and mCASP-7. The tissue distribution of the CASP-1 subfamily transcripts is more restricted than that of the CASP-3 subfamily transcripts, suggesting that the transcriptional regulation of the CASP members within one subfamily is related, but is quite different between the CASP-1 and the CASP-3 subfamilies. Transient overexpression of each of the seven CASPs induced apoptosis in mammalian cells. Only two, mCASP-1 as well as mCASP-3, were able to process precursor interleukin (IL)-1beta to biologically active IL-1beta. In addition, mCASP-3 is the predominant PARP-cleaving enzyme in vivo.
Insights
Seven murine caspases (mCASP) were cloned and characterized. All seven mCASP family members induced apoptosis, with mCASP-1 and mCASP-3 processing interleukin-1beta.
Area of Science:
- Molecular Biology
- Cell Biology
- Immunology
Background:
- Caspases are key regulators of apoptosis.
- Understanding the murine caspase (mCASP) family is crucial for studying cell death pathways.
Purpose of the Study:
- To clone and functionally characterize seven members of the murine caspase family.
- To investigate the subfamily classification and tissue distribution of mCASP transcripts.
- To determine the apoptotic and processing activities of individual mCASPs.
Main Methods:
- Cloning and transient overexpression of seven mCASP genes.
- Analysis of caspase-induced apoptosis in mammalian cells.
- Assessment of precursor interleukin (IL)-1beta processing and poly(ADP-ribose) polymerase (PARP) cleavage.
Main Results:
- Murine caspases were divided into three subfamilies based on sequence homology.
- Tissue distribution of CASP-1 subfamily transcripts was more restricted than CASP-3 subfamily transcripts.
- All seven overexpressed mCASPs induced apoptosis; mCASP-1 and mCASP-3 processed IL-1beta, and mCASP-3 cleaved PARP.
Conclusions:
- The mCASP family exhibits distinct subfamily structures and transcriptional regulation.
- Specific mCASPs, particularly mCASP-3, play significant roles in apoptosis and inflammatory cytokine processing.