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O-Glycoprotein DeGP-4 From Dioscorea esculenta (Lour.) Burkill: Isolation, Structural Characterization, and Potent
Guo Xu1, Chen Li1, Jing Liang1
1College of Chemistry and Chemical Engineering, Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, China.
Chemistry & Biodiversity
|June 24, 2026
Summary
A novel glycoprotein, DeGP-4, from Dioscorea esculenta exhibits significant antitumor potential against breast cancer cell lines. This natural compound effectively inhibits cancer cell proliferation and migration, offering a promising therapeutic candidate.
Area of Science:
- Biochemistry and Molecular Biology
- Pharmacology and Toxicology
- Natural Product Chemistry
Background:
- Breast cancer remains a leading cause of mortality worldwide, necessitating the discovery of novel therapeutic agents.
- Natural products, particularly glycoproteins, have shown promise as anticancer agents due to their diverse biological activities.
- Dioscorea esculenta (Lour.) Burkill is a plant with a history of medicinal use, suggesting potential for bioactive compound discovery.
Purpose of the Study:
- To isolate and characterize a glycoprotein (DeGP-4) from Dioscorea esculenta.
- To evaluate the in vitro and in vivo antitumor activity of DeGP-4 against human breast cancer cell lines (MDA-MB-231 and BT-549).
- To elucidate the molecular mechanisms underlying DeGP-4's anticancer effects.
Main Methods:
- Glycoprotein isolation and purification from Dioscorea esculenta.
- Biochemical characterization of DeGP-4, including protein and carbohydrate content, molecular weight, amino acid, and carbohydrate composition analysis.
- In vitro antiproliferative assays, apoptosis induction studies (ROS production, apoptotic protein modulation), and migration assays.
- In vivo antitumor activity assessment using a mouse tumor model, complemented by histological and immunohistochemical analyses.
Main Results:
- DeGP-4 was isolated as a glycoprotein of approximately 23.28 kDa with 93.20% purity, rich in Asp, Glu, mannose, and glucose.
- DeGP-4 exhibited potent inhibition of MDA-MB-231 and BT-549 cell proliferation (IC50 values of 1.2 and 2.5 µg/mL, respectively), outperforming cisplatin in one cell line.
- DeGP-4 suppressed tumor cell migration, induced apoptosis via ROS production, and modulated key apoptotic proteins (Bcl-2, Bax, Caspase-3), with significant in vivo antitumor efficacy confirmed.
Conclusions:
- The purified glycoprotein DeGP-4 from Dioscorea esculenta possesses significant antitumor activity against aggressive breast cancer cell lines.
- DeGP-4 exerts its effects by inhibiting proliferation, suppressing migration, and inducing apoptosis through ROS generation and modulation of apoptotic pathways.
- DeGP-4 represents a promising natural compound for further development as a potential therapeutic agent for breast cancer treatment.
