Structure and Antitumor and Immunomodulatory Activities of a Water-Soluble Polysaccharide from Dimocarpus longan Pulp

International Journal of Molecular Sciences

Fa-Yan Meng¹  Yuan-Ling Ning¹  Jia Qi²  Zhou He³  Jiang Jie¹  Juan-Juan Lin¹  Yan-Jun Huang¹  Fu-Sen Li¹ 

[1] School of Pharmaceutical Sciences, Guangxi Medical University, No. 22 Shuangyong Road, Nanning 530021, Guangxi, China; E-Mails:;Department of Pharmacy, Heilongjiang Nursing College, No. 209 Xuefu Road, Harbin 150036, Heilongjiang, China; E-Mail:;Department of Acupuncture and Moxibustion, the People’s Hospital of Guangxi Zhuang Autonomous Region, No. 6 Taoyuan Road, Nanning 530021, Guangxi, China; E-Mail:

关键词: structure;    antitumor activity;    immunomodulatory activity;    polysaccharide;    Dimocarpus longan pulp;   

DOI  :  10.3390/ijms15035140

来源: mdpi

【 摘 要 】

A new water-soluble polysaccharide (longan polysaccharide 1 (LP1)) was extracted and successfully purified from Dimocarpus longan pulp via diethylaminoethyl (DEAE)-cellulose anion-exchange and Sephacryl S-300 HR gel chromatography. The chemical structure was determined using Infrared (IR), gas chromatography (GC) and nuclear magnetic resonance (NMR) analysis. The results indicated that the molecular weight of the sample was 1.1 × 10⁵ Da. Monosaccharide composition analysis revealed that LP1 was composed of Glc, GalA, Ara and Gal in a molar ratio of 5.39:1.04:0.74:0.21. Structural analysis indicated that LP1 consisted of a backbone of →4)-α-d-Glcp-(1→4)-α-d-GalpA-(1→4)-α-d-Glcp-(1→4)-β-d-Glcp-(1→ units with poly saccharide side chains composed of →2)-β-d-Fruf-(1→2)-l-sorbose-(1→ attached to the O-6 position of the α-d-Glcp residues. In vitro experiments indicated that LP1 had significantly high antitumor activity against SKOV3 and HO8910 tumor cells, with inhibition percentages of 40% and 50%, respectively. In addition, LP1 significantly stimulated the production of the cytokine interferon-γ (IFN-γ), increased the activity of murine macrophages and enhanced B- and T-lymphocyte proliferation. The results of this study demonstrate that LP1 has potential applications as a natural antitumor agent with immunomodulatory activity.

【 授权许可】

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