Effect of UV‐A Irradiance on Lipid Accumulation in <i>Nannochloropsis oculata</i>

Srinivas, Rathy; Ochs, Clifford A.

doi:10.1111/j.1751-1097.2012.01091.x

Cited by 30 publications

(12 citation statements)

References 28 publications

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“…This statement agrees with the results obtained by other authors in Nannochloropsis (Forján et al. , Srinivas and Ochs ) and artic diatoms (Leu et al. ), but differs from Wang and Chai () and Arts and Rai (), who have reported that UV radiation results in the depletion of ω‐3 fatty acids in microalgae.…”

Section: Discussionsupporting

confidence: 92%

Effects of global change factors on fatty acids and mycosporine‐like amino acid production in Chroothece richteriana (Rhodophyta)

González-Silvera

Perez

Korbee

et al. 2017

Journal of Phycology

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Under natural conditions, Chroothece richteriana synthesizes a fairly high proportion of fatty acids. However, nothing is known about how environmental changes affect their production, or about the production of protective compounds, when colonies develop under full sunshine with high levels of UV radiation. In this study, wild colonies of C. richteriana were subjected to increasing temperature, conductivity, ammonium concentrations and photosynthetically active radiation (PAR), and UV radiations to assess the potential changes in lipid composition and mycosporine-like amino acids (MAAs) concentration. The PERMANOVA analysis detected no differences for the whole fatty acid profile among treatments, but the percentages of α-linolenic acid and total polyunsaturated fatty acids increased at the lowest assayed temperature. The percentages of linoleic and α-linolenic acids increased with lowering temperature. γ-linolenic and arachidonic acids decreased with increasing conductivity, and a high arachidonic acid concentration was related with increased conductivity. The samples exposed to UVB radiation showed higher percentages of eicosapentaenoic acid and total monounsaturated fatty acids, at the expense of saturated fatty acids. MAAs accumulation increased but not significantly at the lowest conductivity, and also with the highest PAR and UVR exposure, while ammonium and temperature had no effect. The observed changes are probably related with adaptations of both membrane fluidity to low temperature, and metabolism to protect cells against UV radiation damage. The results suggest the potential to change lipid composition and MAAs concentration in response to environmental stressful conditions due to climate change, and highlight the interest of the species in future research about the biotechnological production of both compound types.

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Section: Discussionsupporting

confidence: 92%

Effects of global change factors on fatty acids and mycosporine‐like amino acid production in Chroothece richteriana (Rhodophyta)

González-Silvera

Perez

Korbee

et al. 2017

Journal of Phycology

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“…In a study carried out by Srinivas and Ochs [91] on Nannochloropsis oculata the effect of UV-A at different levels of exposure on total lipid accumulation was investigated. UV-A treatments significantly increased the PUFA (chlorophyll-specific lipid concentration) of N. oculata cells, and UV-A and decreased nutrients had a synergistic effect on lipid accumulation.…”

Section: Uv Irradiance For Lipid Inductionmentioning

confidence: 99%

High Lipid Induction in Microalgae for Biodiesel Production

2012

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Oil-accumulating microalgae have the potential to enable large-scale biodiesel production without competing for arable land or biodiverse natural landscapes. High lipid productivity of dominant, fast-growing algae is a major prerequisite for commercial production of microalgal oil-derived biodiesel. However, under optimal growth conditions, large amounts of algal biomass are produced, but with relatively low lipid contents, while species with high lipid contents are typically slow growing. Major advances in this area can be made through the induction of lipid biosynthesis, e.g., by environmental stresses. Lipids, in the form of triacylglycerides typically provide a storage function in the cell that enables microalgae to endure adverse environmental conditions. Essentially algal biomass and triacylglycerides compete for photosynthetic assimilate and a reprogramming of physiological pathways is required to stimulate lipid biosynthesis. There has been a wide range of studies carried out to identify and develop efficient lipid induction techniques in microalgae such as nutrients stress (e.g., nitrogen and/or phosphorus starvation), osmotic stress, radiation, pH, temperature, heavy metals and other chemicals. In addition, several genetic strategies for increased triacylglycerides production and inducibility are currently being developed. In this review, we discuss the potential of lipid induction techniques in microalgae and also their application at commercial scale for the production of biodiesel.

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“…Nannochloroposis spp. are cultivated for EPA production so as to be used in aquaculture as nutritional ingredient and in pharmaceutical sector as a bioactive ingredient for the prevention of various human diseases (Wang and Chai, 1994;Srinivas and Ochs, 2012). Concerning applications in cosmetology, only Nannochloropsis oculata extracts have been commercially used, since they were proven to have skin-tightening properties (Susan et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Skin Protective Effects of Nannochloropsis gaditana Extract on H2O2-Stressed Human Dermal Fibroblasts

Letsiou¹,

Kalliampakou

Gardikis³

et al. 2017

Front. Mar. Sci.

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Nowadays, there is huge interest in natural products obtained from marine organisms that can promote a state of health and well-being for humans. Microalgae represent a primary source of bioactive compounds that could be used as functional ingredients in cosmetic formulations. The aim of the present study is to evaluate, for the first time, the effects of Nannochloropsis gaditana extract against oxidative stress in human primary fibroblasts so as to investigate the potential applications of it in cosmetics. To gain an insight into the molecular mechanisms of N. gaditana bioactivity, we developed a new RT-qPCR platform for studying transcript accumulation for an array of selected genes (up to 100) involved in many skin-related processes including anti-aging, hydration, oxidative stress response, and DNA damage. For the oxidative stress evaluation, H 2 O 2 was used as a stressor. The study of the transcript accumulation of genes revealed that N. gaditana extract exhibits skin protection properties by mediating oxidative responses and apoptosis (including SOD1, GPX1, BID), positively regulates genes involves in skin texture and hydration (including AQP3, Col6A1, FBN1) and modulates the expression of genes involved in skin irritation, DNA damage and aging (including IL1R, PCNA, FOXO3). These findings indicate that the specific N. gaditana extract possesses significant in vitro skin protection activity against induced oxidative stress, and provide new insights into the beneficial role of microalgae bioactive compounds in cosmetic formulations protecting skin from oxidative stress.

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Effect of UV‐A Irradiance on Lipid Accumulation in Nannochloropsis oculata

Cited by 30 publications

References 28 publications

Effects of global change factors on fatty acids and mycosporine‐like amino acid production in Chroothece richteriana (Rhodophyta)

Effects of global change factors on fatty acids and mycosporine‐like amino acid production in Chroothece richteriana (Rhodophyta)

High Lipid Induction in Microalgae for Biodiesel Production

Skin Protective Effects of Nannochloropsis gaditana Extract on H2O2-Stressed Human Dermal Fibroblasts

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