Characteristics of chlorophyll formation of the aerial microalga Coelastrella striolata var. multistriata and its application for environmental biomonitoring

Abe, Katsuyuki; Takizawa, Hiroyuki; Kimura, Seiko; Hirano, Morio

doi:10.1016/s1389-1723(04)70239-x

Cited by 22 publications

(5 citation statements)

References 15 publications

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“…Colonies of the airborne microalgae became reddish on agar plates after prolonged incubation (more than 4 weeks) under continuous light. This phenomenon is reminiscent of Haematococcus pluvialis 15 , Coelastrella striolata 16 and Coelastrella sp. F50 17 , which accumulate high levels of carotenoids, which are strong antioxidants, under stressful conditions.…”

Section: Resultsmentioning

confidence: 97%

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Mechanisms protect airborne green microalgae during long distance dispersal

Chiu

Yong

et al. 2020

Sci Rep

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Viable microalgae occur in the air. Whether they can survive the stresses such as UV, desiccation and freezing temperatures at high altitudes during long distance dispersal is rarely studied. if yes, what mechanisms confer the tolerance? four freshwater airborne green microalgae were isolated from Dongsha Atoll in the South China Sea, classified as Scenedesmus sp. DSA1, Coelastrella sp. DSA2, Coelastrella sp. DSA3 and Desmodesmus sp. DSA6 based on their morphologies and ITS sequences. their survival rates under UV stress were tightly correlated with their cell wall thickness. All the four airborne green microalgae survived the air-dry stress on benchtop followed by − 20 °C freezedesiccation stress for 4 weeks, but not the two waterborne green microalgae Desmodesmus sp. F5 and Neodesmus sp. UTEX 2219-4 used as controls. Three of the four airborne microalgae survived the lyophilization treatment, excluding Desmodesmus sp. DSA6 and the two waterborne microalgae. The four airborne microalgae produced carotenoids under prolonged stress conditions, which might help detoxify the reactive oxygen species generated under environmental stresses and shield from the highlight stress in the air. characterization of these airborne microalgae may help answer how the descendants of green algae survived on the land about 450 MYA. Darwin described the falling of fine dust particles from the sails of his vessel on many occasions while cruising in the Atlantic Ocean. He reported that the particles contained dry "infusoria" which included siliceous shells of many freshwater species and a least one marine diatom identified using microscopes available at that time 1. Although he did not attempt to grow microalgae from the dust collections, it is now well known that viable microalgae occur in the atmosphere 2-5. In a historical survey of airborne microalgae, van Overeem collected green microalgae in northern Europe using an airplane at various altitudes 3. These cells were cultivated, and nine algal isolates were identified. In the US, airborne microalgal cells were isolated in many states using car and airplane in a study conducted by Brown et al. 2. These isolates were classified into 38 and 17 genera of Chlorophyta and Chrysophyta, respectively, in addition to seven genera of cyanobacteria. More recently, airborne algae were surveyed in Hawaii, and the results of this investigation showed that these algae were dominated by cyanobacteria, followed by green algae and diatoms 6. A comprehensive review of the history of airborne microalgae studies is provided by Sharma et al. 4. Most studies on airborne microalgae have been focused on their diversity and abundance in various regions and at different altitudes, as well as the effects of these airborne cells on human health, such allergenicity and toxicity 4,7. How they resist environmental stresses in the air has rarely been discussed 8. When microalgal cells are dispersed through a long distance in the atmosphere, they encounter a few environmental stresses not common in water and on the ...

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Section: Resultsmentioning

confidence: 97%

“…isolated by Abe et al . from rock surfaces in Japan (their ITS sequences not available at the time of this manuscript preparation), which could produce high levels of carotenoids 16 , 19 , 20 . The common features of DSA2, DSA3, and the two aeroterrestrial Coelastrella spp .…”

Section: Discussionmentioning

confidence: 99%

Mechanisms protect airborne green microalgae during long distance dispersal

Chiu

Yong

et al. 2020

Sci Rep

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“…Its carotenogenesis biosynthetic pathway thus seems different from that of H. pluvialis, which produces mostly esterified astaxanthin [ 59 ], and seems close to the carotenogenesis of C. zofingiensis , Chlorococcum sp., and other Coelastrella strains, which accumulate the same carotenoids species as Coelastrella sp. S6 [ 16 , 17 , 60 , 61 , 62 ]. The biosynthesis pathway of astaxanthin and canthaxanthin has only been recently elucidated in C. zofingiensis and showed that astaxanthin is synthesized from the ketolation of zeaxanthin, rather than by the hydroxylation of canthaxanthin [ 63 ], setting the basis for rational genetic engineering.…”

Section: Resultsmentioning

confidence: 99%

A Fast-Growing Oleaginous Strain of Coelastrella Capable of Astaxanthin and Canthaxanthin Accumulation in Phototrophy and Heterotrophy

Corato

Baurain

et al. 2022

Life

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Considering the importance of microalgae as a promising feedstock for the production of both low- and high-value products, such as lipids and pigments, it is desirable to isolate strains which simultaneously accumulate these two types of products and grow in various conditions in order to widen their biotechnological applicability. A novel freshwater strain from the genus Coelastrella was isolated in Belgium. Compared to other Coelastrella species, the isolate presented rapid growth in phototrophy, dividing 3.5 times per day at a light intensity of 400 µmol·m−2·s−1 and 5% CO2. In addition, nitrogen depletion was associated with the accumulation of astaxanthin, canthaxanthin, and fatty acids, which reached ~30% of dry weight, and a majority of SFAs and MUFAs, which are good precursors for biodiesel. This strain also accumulated astaxanthin and canthaxanthin in heterotrophy. Although the content was very low in this latter condition, it is an interesting feature considering the biotechnological potential of the microalgal heterotrophic growth. Thus, due to its rapid growth in the light, its carotenogenesis, and its fatty acids characteristics, the newly identified Coelastrella strain could be considered as a potential candidate for biorefinery purposes of both low- and high-values products.

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“…HCC accounts for 70‐85% of liver cancers and is one of the most common malignancies worldwide (Abe, Takizawa, Kimura, & Hirano, 2004). Current HCC therapies include surgery, liver transplantation, chemotherapy, transarterial chemoembolization, and radiofrequency ablation (Poon et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Microalgal extract from thermotolerant Coelastrella sp. F50 retards the liver tumor progression by targeting hepatic cancer stem cells

Chang

Chu

et al. 2021

Phytotherapy Research

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Microalgae extracts have shown antitumor activities. However, the antitumor mechanism of them is not yet completely clear, especially the effect on cancer stem cells (CSCs). This study aimed to elucidate the antitumor activity and mechanism of microalgal extract from thermotolerant Coelastrella sp. F50 (F50) in hepatocellular carcinoma (HCC). Oncogenic behaviors were analyzed using cell proliferation, colony formation, invasion, sphere formation, and side population cells (SPCs) assays in HCC cells after F50 treatment. The molecular mechanism was further studied by quantitative real-time PCR, immunoblot, and immunofluorescence analyses. The chemopreventive efficacy of F50 was evaluated in rat orthotopic hepatoma, and the hepatic pathologies were investigated by immunohistochemical, immunoblot, and immunofluorescence analyses. F50 specifically suppressed hepatic CSCs (tumor spheres, drug efflux, CD133/ABCG2 CSCs markers) with no cytotoxicity in vitro. In the animal experiments, prophylactic F50 administration significantly attenuated tumor progression and improved liver function in HCC-bearing rats. In the mechanistic analysis, F50

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Characteristics of chlorophyll formation of the aerial microalga Coelastrella striolata var. multistriata and its application for environmental biomonitoring

Cited by 22 publications

References 15 publications

Mechanisms protect airborne green microalgae during long distance dispersal

Mechanisms protect airborne green microalgae during long distance dispersal

A Fast-Growing Oleaginous Strain of Coelastrella Capable of Astaxanthin and Canthaxanthin Accumulation in Phototrophy and Heterotrophy

Microalgal extract from thermotolerant Coelastrella sp. F50 retards the liver tumor progression by targeting hepatic cancer stem cells

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