Aqueous extracts from cultivated Cistanche deserticola Y.C. Ma as polysaccharide adjuvant promote immune responses via facilitating dendritic cell activation
Copyright © 2021 Elsevier B.V. All rights reserved..
ETHNOPHARMACOLOGICAL RELEVANCE: Herbal polysaccharides have exhibited great immune-enhancing potential. Adjuvants are a key tool for developing efficacious vaccines. In our previous study, a water-soluble polysaccharide extracted from wild Cistanche deserticola Y.C. Ma showed potent immunostimulatory activity.
AIM OF STUDY: In this study, the immune profiles and efficacy of aqueous extracts of cultivated Cistanche deserticola Y.C. Ma (AECCD) on ICR mice against ovalbumin (OVA) were investigated. In vitro experiments, the possible DC activation mechanism by AECCD was evaluated.
MATERIALS AND METHODS: AECCD were extracted using hot water after which the crude polysaccharides were precipitated by ethanol. Mice were firstly immunized subcutaneously with OVA (10 μg per mouse) alone or OVA (10 μg per mouse) respectively containing different dose of AECCD (200, 400 and 800 μg per mouse) on Days 1 and 14 and the magnitude and kinetics of antibodies and cell-mediated responses were then assessed.
RESULTS: AECCD elicited vigorous and long-term IgG responses with mixed Th1/Th2 responses and up-regulated levels of Th-associated cytokines (CD4+IL-4, CD4+IFN-γ and CD8+IFN-γ). Moreover, AECCD induced the strong cellular immune response characterized by increased splenocyte proliferation as well as the activated T cell response. Notably, AECCD significantly enhanced the maturation of dendritic cells (DCs) and inhibited Tregs. In vitro experiments, Preliminary tests indicated that AECCD induced DC activation by promoting phenotypic maturation, cytokine section and allostimulatory activity. Toll-like receptor 4 (TLR4) was an essential receptor for DCs to directly bind AECCD. The inhibitors of NF-κB decreased the expression levels of CD40, CD80, CD86 and MHC-II and the production of IFN-γ, TNF-α and IL-6 through DCs.
CONCLUSIONS: Finally, these findings suggested that AECCD could elicit potent and durable antigen specific immune responses through DC activation, which was involved in the regulation of maturation markers and cytokine expression via TLR4-related NF-κB pathway. The study indicates that AECCD is a potential immunomodulator.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:277 |
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| Enthalten in: |
Journal of ethnopharmacology - 277(2021) vom: 15. Sept., Seite 114256 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Feng, Shuangshuang [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 23.11.2021 Date Revised 23.11.2021 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.jep.2021.114256 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM326107517 |
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| 100 | 1 | |a Feng, Shuangshuang |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Aqueous extracts from cultivated Cistanche deserticola Y.C. Ma as polysaccharide adjuvant promote immune responses via facilitating dendritic cell activation |
| 264 | 1 | |c 2021 | |
| 336 | |a Text |b txt |2 rdacontent | ||
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| 500 | |a Date Completed 23.11.2021 | ||
| 500 | |a Date Revised 23.11.2021 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Copyright © 2021 Elsevier B.V. All rights reserved. | ||
| 520 | |a ETHNOPHARMACOLOGICAL RELEVANCE: Herbal polysaccharides have exhibited great immune-enhancing potential. Adjuvants are a key tool for developing efficacious vaccines. In our previous study, a water-soluble polysaccharide extracted from wild Cistanche deserticola Y.C. Ma showed potent immunostimulatory activity | ||
| 520 | |a AIM OF STUDY: In this study, the immune profiles and efficacy of aqueous extracts of cultivated Cistanche deserticola Y.C. Ma (AECCD) on ICR mice against ovalbumin (OVA) were investigated. In vitro experiments, the possible DC activation mechanism by AECCD was evaluated | ||
| 520 | |a MATERIALS AND METHODS: AECCD were extracted using hot water after which the crude polysaccharides were precipitated by ethanol. Mice were firstly immunized subcutaneously with OVA (10 μg per mouse) alone or OVA (10 μg per mouse) respectively containing different dose of AECCD (200, 400 and 800 μg per mouse) on Days 1 and 14 and the magnitude and kinetics of antibodies and cell-mediated responses were then assessed | ||
| 520 | |a RESULTS: AECCD elicited vigorous and long-term IgG responses with mixed Th1/Th2 responses and up-regulated levels of Th-associated cytokines (CD4+IL-4, CD4+IFN-γ and CD8+IFN-γ). Moreover, AECCD induced the strong cellular immune response characterized by increased splenocyte proliferation as well as the activated T cell response. Notably, AECCD significantly enhanced the maturation of dendritic cells (DCs) and inhibited Tregs. In vitro experiments, Preliminary tests indicated that AECCD induced DC activation by promoting phenotypic maturation, cytokine section and allostimulatory activity. Toll-like receptor 4 (TLR4) was an essential receptor for DCs to directly bind AECCD. The inhibitors of NF-κB decreased the expression levels of CD40, CD80, CD86 and MHC-II and the production of IFN-γ, TNF-α and IL-6 through DCs | ||
| 520 | |a CONCLUSIONS: Finally, these findings suggested that AECCD could elicit potent and durable antigen specific immune responses through DC activation, which was involved in the regulation of maturation markers and cytokine expression via TLR4-related NF-κB pathway. The study indicates that AECCD is a potential immunomodulator | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Cultivated Cistanche deserticola | |
| 650 | 4 | |a Dendritic cells | |
| 650 | 4 | |a Immunomodulator | |
| 650 | 4 | |a NF-κB signaling pathway | |
| 650 | 4 | |a Polysaccharide adjuvant | |
| 650 | 4 | |a Toll-like receptor 4 | |
| 650 | 7 | |a Adjuvants, Immunologic |2 NLM | |
| 650 | 7 | |a Cytokines |2 NLM | |
| 650 | 7 | |a Immunologic Factors |2 NLM | |
| 650 | 7 | |a Plant Extracts |2 NLM | |
| 650 | 7 | |a Polysaccharides |2 NLM | |
| 650 | 7 | |a Ovalbumin |2 NLM | |
| 650 | 7 | |a 9006-59-1 |2 NLM | |
| 700 | 1 | |a Yang, Xiumei |e verfasserin |4 aut | |
| 700 | 1 | |a Weng, Xiang |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Bin |e verfasserin |4 aut | |
| 700 | 1 | |a Zhang, Ailian |e verfasserin |4 aut | |
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