کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8327641 | 1540201 | 2018 | 37 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural characterization of polysaccharides from Saposhnikovia divaricata and their antagonistic effects against the immunosuppression by the culture supernatants of melanoma cells on RAW264.7 macrophages
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Two purified native polysaccharides, namely, SDNP-1 and SDNP-2 with apparent molecular weight of 67.9 Ã 103 and 5.2 Ã 103, separately, were isolated from the water extract of Saposhnikovia divaricata by combined ion-exchange and gel permeation chromatography. The structures of these polysaccharides were characterized by high-performance gel permeation chromatography, chemical derivative analysis, GC-MS, FT-IR spectroscopy, and NMR spectroscopy. Results showed that SDNP-1 and SDNP-2 were composed of arabinose and galactose with molar ratio of approximately 1:1. The polysaccharides were deduced to be AGII-type arabinogalactans with distinct molecular weights and backbone chains. The backbone chain of SDNP-2 mainly consisted of (1 â 3)-linked and (1 â 6)-linked Galp residues with an approximate molar ratio of 1:3. Approximately half of the (1 â 6)-linked Galp residues were substituted at O-3, and small amounts of (1 â 6)-linked Galp were substituted at O-3 and O-4 by branches that mainly consisted of terminal and (1 â 5)-linked Araf residues. Bioactivity tests showed that SDNP-2 exhibited significant antagonistic effect against immunosuppression as shown by the cell viability of the culture supernatants of melanoma cells on RAW264.7 macrophages. However, SDNP-1 showed no effect. Thus, molecular weight and backbone chain may be the key factors for the antagonistic effects against immunosuppression.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Biological Macromolecules - Volume 113, 1 July 2018, Pages 748-756
Journal: International Journal of Biological Macromolecules - Volume 113, 1 July 2018, Pages 748-756
نویسندگان
Cai-Xia Dong, Liu Liu, Chang-Ying Wang, Zheng Fu, Ying Zhang, Xuan Hou, Chao Peng, Rui-Xue Ran, Zhi Yao,