Discovery of antitumor effects of leczymes
Takeo Tatsuta1, Masahiro Hosono2
1Division of Cell Recognition, Institute of Molecular Biomembrane and Glycobiology, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan.
Abstract:
Sialic-acid binding lectin from bullfrog (Rana catesbeiana) eggs, cSBL, is a cytotoxic ribonuclease (RNase) belonging to the RNase A superfamily. cSBL is cytotoxic to tumor cells, such as malignant pleural mesothelioma by inducing apoptotic cell death caused by the degradation of RNA in tumor cells. In addition, we have reported some data that cSBL could be involved in the endoplasmic reticulum stress pathway, and it was also assumed to cause apoptotic cell death. The most significant property of cSBL is its specificity toward malignant cells. Furthermore, since the antitumor activity of cSBL was confirmed by in vivo experiments using mouse xenograft models, it is expected to be a candidate for clinical chemotherapy. Here, we summarize the history of cSBL, alternatively called "leczyme," with its present and future.
Insights
Bullfrog egg lectin (cSBL) is a cytotoxic ribonuclease that selectively induces apoptosis in tumor cells. Its confirmed in vivo antitumor activity suggests potential for clinical chemotherapy.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Sialic-acid binding lectin (cSBL) from bullfrog eggs is a ribonuclease (RNase) in the RNase A superfamily.
- cSBL exhibits cytotoxicity towards tumor cells, including malignant pleural mesothelioma.
- Previous studies suggest cSBL involvement in endoplasmic reticulum stress pathways, leading to apoptotic cell death.
Purpose of the Study:
- To review the history, current status, and future prospects of cSBL as a potential anti-cancer therapeutic.
- To highlight cSBL's unique specificity for malignant cells.
- To discuss the implications of in vivo antitumor activity for clinical applications.
Main Methods:
- Review of existing literature on cSBL (leczyme).
- Analysis of cytotoxic mechanisms, including RNA degradation and endoplasmic reticulum stress.
- Evaluation of in vivo efficacy using mouse xenograft models.
Main Results:
- cSBL demonstrates potent cytotoxicity against various tumor cells by inducing RNA degradation and apoptosis.
- cSBL exhibits remarkable specificity towards malignant cells.
- In vivo studies confirm the antitumor activity of cSBL.
Conclusions:
- cSBL possesses significant antitumor properties with high specificity for cancer cells.
- The mechanism involves inducing apoptotic cell death through RNA degradation.
- cSBL is a promising candidate for clinical chemotherapy, warranting further investigation.
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