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A Tn antigen binding lectin from Myrsine coriacea displays toxicity in human cancer cell lines
Andrea Medeiros1, Nora Berois, Marcelo Incerti
1Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Av. Gral. Flores 2125, 11800, Montevideo, Uruguay.
Abstract:
The Tn antigen (GalNAc-O-Ser/Thr) is one of the most specific human cancer-associated structures. In the present study we characterize the biochemical and functional properties of the Myrsine coriacea lectin (McL). We show that McL is an unusual high molecular weight highly glycosylated protein, which displays a strong Tn binding activity. The lectin exhibits in vitro inhibition of proliferation in the six cancer cell lines evaluated, in a dose-dependent manner (the strongest activity being against HT-29 and HeLa cells), whereas it does not exhibit toxicity against normal lymphocytes. McL could be exploited in the design of potential new tools for the diagnosis or treatment of cancer.
Insights
Myrsine coriacea lectin (McL) strongly binds the cancer-associated Tn antigen. This lectin inhibits cancer cell proliferation in vitro without harming normal lymphocytes, suggesting potential diagnostic or therapeutic cancer applications.
Area of Science:
- Biochemistry
- Glycobiology
- Cancer Research
Background:
- The Tn antigen (GalNAc-O-Ser/Thr) is a highly specific tumor-associated carbohydrate antigen.
- Lectins are proteins with specific carbohydrate-binding properties, making them valuable tools in biological research.
Purpose of the Study:
- To characterize the biochemical and functional properties of Myrsine coriacea lectin (McL).
- To evaluate the potential of McL as a tool for cancer diagnosis or treatment.
Main Methods:
- Biochemical characterization of Myrsine coriacea lectin (McL).
- Assessment of McL's binding activity towards the Tn antigen.
- In vitro proliferation inhibition assays using various cancer cell lines and normal lymphocytes.
Main Results:
- McL is a high molecular weight, highly glycosylated protein with strong Tn antigen binding activity.
- McL demonstrated dose-dependent inhibition of proliferation in six evaluated cancer cell lines, notably HT-29 and HeLa.
- No toxicity was observed against normal human lymphocytes.
Conclusions:
- Myrsine coriacea lectin (McL) exhibits specific binding to the Tn antigen and potent anti-proliferative effects on cancer cells.
- McL shows selectivity, sparing normal lymphocytes from toxicity.
- McL holds promise for the development of novel diagnostic and therapeutic strategies for cancer.
