scholarly journals Allelopathic interactions of linoleic acid and nitric oxide increase the competitive ability of Microcystis aeruginosa

2017 ◽  
Vol 11 (8) ◽  
pp. 1865-1876 ◽  
Author(s):  
Hao Song ◽  
Michel Lavoie ◽  
Xiaoji Fan ◽  
Hana Tan ◽  
Guangfu Liu ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Linoleic Acid ◽  
Microcystis Aeruginosa ◽  
Competitive Ability ◽  
Allelopathic Interactions

scholarly journals Competitive dominance of Microcystis aeruginosa against Raphidiopsis raciborskii is strain- and temperature-dependent

2020 ◽  
pp. 36
Author(s):  
Lamei Lei ◽  
Jingjun Dai ◽  
Qiuqi Lin ◽  
Liang Peng
Keyword(s):  
Microcystis Aeruginosa ◽  
Competitive Ability ◽  
Competitive Exclusion ◽  
Strain Difference ◽  
Freshwater Ecosystems ◽  
Cylindrospermopsis Raciborskii ◽  
Temperature Dependent ◽  
Temperature Levels ◽  
Multiple Strains ◽  
Allelopathic Interactions

Microcystis aeruginosa and Raphidiopsis raciborskii (previously Cylindrospermopsis raciborskii) are both common bloom-forming cyanobacteria which can coexist but alternatively dominate in freshwater ecosystems. To predict their blooming dynamics, we need to understand the potential environmental factors determining their succession. In the present study, we examined the pairwise competition of the three M. aeruginosa strains (FACHB905, 469 and 915) with one R. raciborskii strain (N8) at three temperature levels (16 °C, 24 °C, and 32 °C). We found that the competitive ability of three Microcystis strains were highly variable. M. aeruginosa FACHB905 was the strongest competitor among them which can finally exclude R. raciborskii N8 regardless of initial biovolume ratios and temperature levels. The competitive exclusion of N8 by 915 also was observed at 24 °C, but they coexisted at 16 °C and 32 °C. We observed that M. aeruginosa FACHB469 and R. raciborskii N8 were able to coexist under all the temperature levels, and M. aeruginosa FACHB469 was the weakest competitor among the three M. aeruginosa strains. Rates of competitive exclusion (RCE) showed that temperature affects the competition between three M. aeruginosa strains and R. raciborskii N8. M. aeruginosa strains always grew quickly at 24 °C and significantly enlarged its dominance in the co-culture system, while R. raciborskii N8 was able to maintain its initial advantages at both 16 and 32 °C. The competitive advantage of M. aeruginosa FACHB905 may be explained by allelopathic interactions through its allelochemicals and other secondary metabolites other than microcystin. We concluded that both strain difference and temperature can affect the competition between M. aeruginosa and R. raciborskii. Our results highlighted the complexity of cyanobacterial dynamics in waterbodies where there exist multiple strains.

scholarly journals Long‐term acclimation might enhance the growth and competitive ability of Microcystis aeruginosa in warm environments

2021 ◽  
Author(s):  
Bogdan Drugă ◽  
Elisabeth Ramm ◽  
Edina Szekeres ◽  
Cecilia Chiriac ◽  
Adriana Hegedüs ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Competitive Ability

scholarly journals Macrophage activation by lipopolysaccharide, interferon-γ and interleukin-4: effect of fatty acid metabolism

1995 ◽  
Vol 4 (1) ◽  
pp. 25-30 ◽  
Author(s):  
H. Darmani ◽  
J. L. Harwood ◽  
J. Parton ◽  
S. K. Jackson
Keyword(s):  
Nitric Oxide ◽  
Fatty Acids ◽  
Arachidonic Acid ◽  
Linoleic Acid ◽  
Macrophage Activation ◽  
Interferon Γ ◽  
Interleukin 4 ◽  
Nitric Oxide Production ◽  
Oxide Production ◽  
Ifn Γ

The aim of this study was to investigate the effects of interferon-γ and -β (IFN-γ, -β), interleukin-4 and -10 (IL-4, -10) and Hpopolysaccharide (LPS) on the metabolism and composition of phospholipid fatty acids in macrophages. Murine J774.2 macrophages were incubated with radiolabelled fatty acids and the appropriate stimulus and the incorporation and composition of the phospholipid classes was determined. IFN-γ and IL-4 specifically stimulated enhanced incorporation of [14C]-linoleic acid into the phosphatidytethanolamine fraction. IL-4 (in contrast to IFN-γ and LPS) reduced incorporation of [14C]- arachidonic acid into phosphatidylinositol. Incubation of J774.2 cells with linoleic acid significantly increased TNFα and nitric oxide production; arachidonic acid enhanced TNFα production but reduced nitric oxide production. It is concluded that IFN-γ, IL-4 and IL-10 may differentially regulate macrophage activation via effects on the metabolism of polyunsaturated fatty acids.

scholarly journals Maternal Plasma Phosphatidylcholine Fatty Acids and Atopy and Wheeze in the Offspring at Age of 6 Years

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Katharine C. Pike ◽  
Philip C. Calder ◽  
Hazel M. Inskip ◽  
Sian M. Robinson ◽  
Graham C. Roberts ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Fatty Acids ◽  
Arachidonic Acid ◽  
Fatty Acid Composition ◽  
Linoleic Acid ◽  
Skin Prick Testing ◽  
Maternal Plasma ◽  
Fractional Exhaled Nitric Oxide ◽  
Metabolic Products ◽  
Reduced Risk

Variation in exposure to polyunsaturated fatty acids (PUFAs) might influence the development of atopy, asthma, and wheeze. This study aimed to determine whether differences in PUFA concentrations in maternal plasma phosphatidylcholine are associated with the risk of childhood wheeze or atopy. For 865 term-born children, we measured phosphatidylcholine fatty acid composition in maternal plasma collected at 34 weeks’ gestation. Wheezing was classified using questionnaires at 6, 12, 24, and 36 months and 6 years. At age of 6 years, the children underwent skin prick testing, fractional exhaled nitric oxide (FENO) measurement, and spirometry. Maternaln-6 fatty acids and the ratio ofn-3 ton-6 fatty acids were not associated with childhood wheeze. However, higher maternal eicosapentaenoic acid, docosahexaenoic acid, and totaln-3 fatty acids were associated with reduced risk of non-atopic persistent/late wheeze (RR 0.57, 0.67 and 0.69, resp.P=0.01, 0.015, and 0.021, resp.). Maternal arachidonic acid was positively associated with FENO (P=0.024). A higher ratio of linoleic acid to its unsaturated metabolic products was associated with reduced risk of skin sensitisation (RR 0.82,P=0.013). These associations provide some support for the hypothesis that variation in exposure ton-6 andn-3 fatty acids during pregnancy influences the risk of childhood wheeze and atopy.

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