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Assaying for Inorganic Polyphosphate in Bacteria
Published on: January 21, 2019
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Biogenic Polyphosphate Nanoparticles from a Marine Cyanobacterium
Guangxin Feng1, Shiyuan Dong2, Min Huang3
1College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, Shandong Province, China. fengguangxin@stu.ouc.edu.cn.
Marine Drugs
|September 12, 2018
Summary
Marine cyanobacteria Synechococcus sp. PCC 7002 produce biogenic polyphosphate nanoparticles (BPNPs). These BPNPs demonstrate anti-inflammatory properties by inhibiting key inflammatory mediators and pathways.
Area of Science:
- Microbiology
- Biotechnology
- Immunology
Background:
- Polyphosphates are recognized for their therapeutic potential in gut health.
- Marine cyanobacteria offer a novel source for biogenic compound production.
Purpose of the Study:
- To investigate the production and characterization of polyphosphate nanoparticles (BPNPs) from marine cyanobacteria.
- To evaluate the anti-inflammatory properties of BPNPs in vitro.
Main Methods:
- Cultivation of Synechococcus sp. PCC 7002 under optimized conditions for polyphosphate accumulation.
- Extraction and purification of BPNPs using hot water extraction and gel filtration.
- Characterization of BPNPs size distribution via ultrafiltration.
- Assessment of BPNP stability during simulated gastrointestinal digestion.
- In vitro evaluation of BPNP anti-inflammatory effects on lipopolysaccharide-activated RAW264.7 cells, focusing on inflammatory mediator production and signaling pathways.
Main Results:
- Intracellular accumulation of nano-sized polyphosphate granules (BPNPs) was achieved in Synechococcus sp. PCC 7002.
- BPNPs were successfully extracted, purified, and fractionated into distinct size populations (10-30 nm and 30-70 nm).
- A small percentage of BPNPs (14-18%) showed degradation during simulated gastrointestinal digestion.
- BPNPs significantly inhibited the expression of cyclooxygenase-2 and inducible nitric oxide synthase.
- BPNPs suppressed the production of pro-inflammatory mediators (NO, TNF-α, IL-6, IL-1β) by downregulating the TLR4/NF-κB signaling pathway.
Conclusions:
- Marine cyanobacterium Synechococcus sp. PCC 7002 is a promising source for producing anti-inflammatory biogenic polyphosphate nanoparticles (BPNPs).
- BPNPs exhibit significant anti-inflammatory activity through the inhibition of key inflammatory mediators and the TLR4/NF-κB pathway.
- These findings highlight the potential of BPNPs as a novel postbiotic therapeutic agent for inflammatory conditions.
Keywords:
Synechococcus sp. PCC 7002Toll-like receptorsanti-inflammationmacrophagespolyphosphate nanoparticlesMore Related Videos
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