Essential Polyunsaturated Fatty Acids Research Articles

Docosahexaenoic acid promotes M2 microglia phenotype via activating PPARγ-mediated ERK/AKT pathway against cerebral ischemia-reperfusion injury

In ischemia-reperfusion stroke, microglia play a dual role in brain injury as well as brain repair, and promoting their switch from a pro-inflammatory M1 phenotype to an anti-inflammatory M2 phenotype is considered to be a potential therapeutic strategy. Docosahexaenoic acid (DHA) is an essential long-chain omega-3 polyunsaturated fatty acid that exhibits potent anti-inflammatory properties in the acute phase of ischemic stroke, but its effect on microglia polarization is unknown. Thus, the objective of this study was to investigate the neuroprotective effects of DHA on rat brain following ischemia-reperfusion injury, and to investigate the mechanism by which DHA regulates microglia polarization. We administered DHA 5 mg/kg intraperitoneally daily for 3 d following a transient middle cerebral artery occlusion reperfusion model in rats. The protective effects of DHA on cerebral ischemia-reperfusion injury were detected by TTC staining, HE staining, Nissler staining, and TUNEL staining. Quantitative real-time PCR, immunofluorescence, western blot, and enzyme-linked immunosorbent assay were used to detect the expression of M1 and M2 microglia-associated markers and PPARγ-mediated ERK/AKT signaling pathway proteins. We found that DHA significantly improved brain injury by decreasing the expression of the M1 phenotypic marker (iNOS, CD16) and increasing the expression of the M2 phenotypic marker (Arg-1, CD206). DHA also increased the expression of peroxisome proliferator-activated receptor gamma (PPARγ) mRNA and protein, increased the expression of the pathway protein AKT, and decreased the expression of ERK1/2. In addition, DHA promoted the expression of anti-inflammatory factor IL-10 and decreased the expression of pro-inflammatory factors TNF-α and IL-1β. However, the PPARγ antagonist GW9662 greatly blocked these beneficial effects. These results suggest that DHA may activate PPARγ to inhibit ERK and activate AKT signaling pathways to regulate microglia polarization, thereby reducing neuroinflammation and promoting neurological recovery to alleviate cerebral ischemia-reperfusion injury.

Development of technology of crackers wuth increased food value to improve the food supply to military servants during a special period

Flour confectionery products have an unstable polyphase structure that needs stabilization. The nutrient composition of these products is characterized by a high content of sugar and saturated fatty acids. The content of protein, dietary fiber, vitamins, and minerals is low. This predetermines the feasibility of using the latest raw materials. This paper has proven the possibility of using flour from extruded sunflower seed kernels (FESSK). FESSK is a unique protein-mineral raw material ingredient that contains essential amino and polyunsaturated fatty acids, as well as biologically active substances. In FESSK, compared to high grade wheat flour (HGWF), the content of protein increases by 3.1–3.3 times; minerals – 13.80–13.82 times; fiber – 98.91–98.93 times; fat – 2.54–2.56 times; the total amount of essential amino acids – by 3.15–3.19 times. One should note the balance of amino acid composition and the usefulness of FESSK proteins (amino acid number (AAN) of essential amino acids approaches 100 %). Compared to HGWF, FESSK has increased biological value index and utilization rate of amino acid composition, by 48.74 % and 39.29 %, respectively. Of the 13 vitamins necessary for the human body, 12 vitamins (92.3 % of the total amount of vitamins) were identified as part of the FESSK composition. In FESSK, compared to HGWF, fat-absorbing capacity increases by 1.50–1.52 times and water retention capacity by 3.62–3.64 times. It was found that the addition of 10.0 % FESSK increases wettability by 6.58–11.19 %; expansion rate by (1,0±0,1) %; ash content – 5.71–13.33 times; fat content by 2,19–6,17 %; protein content by 8.29–21.37 %. The integrated quality indicator increases by 5.1–6.8 %. Alkalinity decreases by 1.04–2.06 %. The expediency of the production of crackers with improved nutritional properties to improve the food supply of servicemen in a special period has been proven.

FADS1-arachidonic acid axis enhances arachidonic acid metabolism by altering intestinal microecology in colorectal cancer

Colonocyte metabolism shapes the microbiome. Metabolites are the main mediators of information exchange between intestine and microbial communities. Arachidonic acid (AA) is an essential polyunsaturated fatty acid and its role in colorectal cancer (CRC) remains unexplored. In this study, we show that AA feeding promotes tumor growth in AOM/DSS and intestinal specific Apc−/− mice via modulating the intestinal microecology of increased gram-negative bacteria. Delta-5 desaturase (FADS1), a rate-limiting enzyme, is upregulated in CRC and effectively mediates AA synthesis. Functionally, FADS1 regulates CRC tumor growth via high AA microenvironment-induced enriched gram-negative microbes. Elimination of gram-negative microbe abolishes FADS1 effect. Mechanistically, gram-negative microbes activate TLR4/MYD88 pathway in CRC cells that contributes FADS1-AA axis to metabolize to prostaglandin E2 (PGE2). Cumulatively, we report a potential cancer-promoting mechanism of FADS1-AA axis in CRC that converts raising synthesized AA to PGE2 via modulating the intestinal microecology of gram-negative.

Can Glyphosate and Temperature Affect the Nutritional Lipid Quality in the Mussel Mytilus galloprovincialis?

Mussels are an important source of the essential omega-3 polyunsaturated fatty acids (n-3 PUFAs), which play a critical role in human health, preventing a variety of diseases. This study aimed to evaluate, for the first time, the combined effect of glyphosate (Gly) and culturing temperature on the lipid content and fatty acid (FA) profile of the Mediterranean mussel M. galloprovincialis. In addition, a number of lipid nutritional quality indices (LNQIs) were applied as important tools to assess the nutritional value of food. Mussels were exposed for 4 days to two Gly concentrations (1 mg/L, 10 mg/L) and two temperatures (T°: 20-26 °C). Statistical analysis showed significant effects of T°C, Gly, and T°C × Gly interaction (p < 0.05) on the lipid and FA profiles of M. galloprovincialis. Mussels exposed to 10 mg/L Gly at 20 °C showed a decrease in eicosapentaenoic (EPA, from 14.6% to 12% of total FAs) and docosahexaenoic acids (DHA, from 10% to 6.4% of total FAs), compared to the control mussels. Both stressors caused a considerable decrease in n-3 PUFAs, which resulted in a less favorable n-6/n-3 PUFA ratio. Overall, this study demonstrated a decline in the nutritive values of mussels, most prominently in groups exposed to 10 mg/L Gly at a temperature of 20 °C and in those exposed to a temperature of 26 °C. This was confirmed by such LNQIs as EPA + DHA, PUFA/Saturated FAs, atherogenic and thrombogenic indices (AI and TI), the health promoting index (HPI), and the unsaturation index (UI). Further investigations into chronic exposure to both stressors are desirable to predict the impacts on aquatic ecosystems and food quality.

Technological Advancement in ω-3 fatty acids: its Therapeutic Functions and Novel Delivery Strategies.

Being an important dietary component, omega-3 (ω-3) fatty acids are essential polyunsaturated fatty acids, which plays a crucial role in normal growth and development of an individual. ω-3 fatty acids have been reported to possess therapeutic activities against several diseases, including cardiovascular, neurological and cancer, etc. Due to unsaturation ω-3 fatty acids are highly reactive and prone oxidation, which is biggest hurdle in its administration, as oxidation produces foul smell and reduces it therapeutic efficacy. Although numerous supplementation strategies have been developed to enhance its bioavailability, targeted drug delivery and maximized therapeutic potential, the rate of compliance is low due to difficulty in swallowing and unpleasant aftertaste. To cope with these problems, several novel drug delivery approaches have been developed, that may be used as an alternative to enhance effectiveness of ω-3 when administered alone or in combination therapy. This review focuses on the how the novel drug delivery approaches are used to overcome the ω-3 stability issues and how to maximize is therapeutic activity.

Effect of omega-6 linoleic acid on neurobehavioral development in Caenorhabditis elegans

Linoleic acid (LA, omega-6), an essential polyunsaturated fatty acid, is supplied by vegetable oils such as corn, sunflower and soybean. Supplementary LA in infants and children is required for normal growth and brain development, but has also been reported to induce brain inflammation and neurodegenerative diseases. This controversial role of LA development requires further investigation. Our study utilized Caenorhabditis elegans (C. elegans) as a model to clarify the role of LA in regulating neurobehavioral development. A mere supplementary quantity of LA in C. elegans larval stage affected the worm's locomotive ability, intracellular ROS accumulation and lifespan. We found that more serotonergic neurons were activated by supplementing LA above 10 μM thereby promoting locomotive ability with upregulation of serotonin-related genes. Supplementation with LA above 10 μM also inhibited the expression of mtl-1, mtl-2 and ctl-3 to accelerate oxidative stress and attenuate lifespan in nematodes; however, enhancement of stress-related genes such as sod-1, sod-3, mtl-1, mtl-2 and cyp-35A2 by supplementary LA under 1 μM decreased oxidative stress and increased the worm's lifespan. In conclusion, our study reveals that supplementary LA possesses both pros and cons in worm physiology and provides new suggestions for LA intake administration in childhood.

Alpha-linolenic acid enhances the facilitation of GABAergic neurotransmission in the BLA and CA1.

Hyperexcitability is a major mechanism implicated in several neuropsychiatric disorders, such as organophosphate-induced status epilepticus (SE), primary epilepsy, stroke, spinal cord injury, traumatic brain injury, schizophrenia, and autism spectrum disorders. Underlying mechanisms are diverse, but a functional impairment and loss of GABAergic inhibitory neurons are common features in many of these disorders. While novel therapies abound to correct for the loss of GABAergic inhibitory neurons, it has been difficult at best to improve the activities of daily living for the majority of patients. Alpha-linolenic acid (ALA) is an essential omega-3 polyunsaturated fatty acid found in plants. ALA exerts pleiotropic effects in the brain that attenuate injury in chronic and acute brain disease models. However, the effect of ALA on GABAergic neurotransmission in hyperexcitable brain regions involved in neuropsychiatric disorders, such as the basolateral amygdala (BLA) and CA1 subfield of the hippocampus, is unknown. Administration of a single dose of ALA (1500 nmol/kg) subcutaneously increased the charge transfer of inhibitory postsynaptic potential currents mediated by GABAA receptors in pyramidal neurons by 52% in the BLA and by 92% in the CA1 compared to vehicle animals a day later. Similar results were obtained in pyramidal neurons from the BLA and CA1 when ALA was bath-applied in slices from naïve animals. Importantly, pretreatment with the high-affinity, selective TrkB inhibitor, k252, completely abolished the ALA-induced increase in GABAergic neurotransmission in the BLA and CA1, suggesting a brain-derived neurotrophic factor (BDNF)-mediated mechanism. Addition of mature BDNF (20 ng/mL) significantly increased GABAA receptor inhibitory activity in the BLA and CA1 pyramidal neurons similar to the results obtained with ALA. ALA may be an effective treatment for neuropsychiatric disorders where hyperexcitability is a major feature.

A diet rich in polyunsaturated fatty acids as supportive therapy in the treatment and prevention of psychotic disorders

IntroductionProper nutrition with fats has a protective effect on the functioning of the nervous system. However, a disturbed ratio of essential polyunsaturated fatty acids supply is nowadays a common phenomenon. A diet overloaded with saturated fats and a shortage of those essential ones in the company with possibly some unfavorable genetic endowment could lead to the release of psychosis from the framework of diet defined by nature for thousands of years.ObjectivesThe study aims to review the literature to assess the influence of supplementation with polyunsaturated fatty acids in the occurrence of psychotic disorders prevention, as well as their impact on remission prolongation.MethodsLiterature review in PubMed, Google Scholar, and Web of Science using the keywords [psychosis] OR [psychotic] OR [schizophrenia] OR [unipolar] OR [bipolar] OR [schizoaffective] OR [depression] OR [manic] OR [hypomanic] OR [mania] OR [hypomania] OR [first episode psychosis] OR [ultra-high risk] OR [UHR] AND [polyunsaturated fatty acids] OR [PUFA] OR [prostaglandin] OR [phospholipid] OR [phospholipase A2] OR [arachidonic acid] OR [linoleic acid] OR [alpha-linolenic acid] OR [omega-3] OR [omega-6] OR [nutrition] OR [diet]. The review included original articles, reviews, systematic reviews, meta-analyses, and case reports from 1977-2022 in Polish and English.Results86 articles devoted to diet and nutrition in psychotic disorders were analyzed. Patients with schizophrenia, bipolar disorder, and schizoaffective disorders exhibit deficiencies in polyunsaturated fatty acids. Such results may indicate compliance with David Horrobin’s theory of the psychotic disorders development in predisposed individuals.ConclusionsSupplementation with polyunsaturated fatty acids may be a chance for a selected group of patients to prolong remission but also hope to prevent the occurrence of psychotic disorders in particularly vulnerable individuals.Disclosure of InterestNone Declared

Protist–Lactic Acid Bacteria Co-Culture as a Strategy to Bioaccumulate Polyunsaturated Fatty Acids in the Protist Aurantiochytrium sp. T66

Thraustochytrids are aquatic unicellular protists organisms that represent an important reservoir of a wide range of bioactive compounds, such as essential polyunsaturated fatty acids (PUFAs) such as arachidonic acid (ARA), docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), which are involved in the regulation of the immune system. In this study, we explore the use of co-cultures of Aurantiochytrium sp. and bacteria as a biotechnological tool capable of stimulating PUFA bioaccumulation. In particular, the co-culture of lactic acid bacteria and the protist Aurantiochytrium sp. T66 induce PUFA bioaccumulation, and the lipid profile was evaluated in cultures at different inoculation times, with two different strains of lactic acid bacteria capable of producing the tryptophan dependent auxins, and one strain of Azospirillum sp., as a reference for auxin production. Our results showed that the Lentilactobacillus kefiri K6.10 strain inoculated at 72 h gives the best PUFA content (30.89 mg g-1 biomass) measured at 144 h of culture, three times higher than the control (8.87 mg g-1 biomass). Co-culture can lead to the generation of complex biomasses with higher added value for developing aquafeed supplements.

Transcriptome-based analysis of key genes and pathways affecting the linoleic acid content in chickens

Linoleic acid is an essential polyunsaturated fatty acid that cannot be synthesized by humans or animals themselves and can only be obtained externally. The amount of linoleic acid present has an impact on the quality and flavour of meat and indirectly affects consumer preference. However, the molecular mechanisms influencing the deposition of linoleic acid in organisms are not clear. As the molecular mechanisms of linoleic acid deposition are not well understood, to investigate the main effector genes affecting the linoleic acid content, this study aimed to screen for hub genes in slow-type yellow-feathered chickens by transcriptome sequencing (RNA-Seq) and weighted gene coexpression network analysis (WGCNA). We screened for candidate genes associated with the linoleic acid content in slow-type yellow-feathered broilers. A total of 399 Tiannong partridge chickens were slaughtered at 126 days of age, fatty acid levels were measured in pectoral muscle, and pectoral muscle tissue was collected for transcriptome sequencing. Transcriptome sequencing results were combined with phenotypes for WGCNA to screen for candidate genes. KEGG enrichment analysis was also performed on the genes that were significantly enriched in the modules with the highest correlation. A total of 13 310 genes were identified after quality control of transcriptomic data from 399 pectoral muscle tissues. WGCNA was performed, and a total of 26 modules were obtained, eight of which were highly correlated with the linoleic acid content. Four key genes, namely, MDH2, ATP5B, RPL7A and PDGFRA, were screened according to the criteria |GS|>0.2 and |MM|>0.8. The functional enrichment results showed that the genes within the target modules were mainly enriched in metabolic pathways. In this study, a large-sample-size transcriptome analysis revealed that metabolic pathways play an important role in the regulation of the linoleic acid content in Tiannong partridge chickens, and MDH2, ATP5B, RPL7A and PDGFRA were screened as important candidate genes affecting the linoleic acid content. The results of this study provide a theoretical basis for selecting molecular markers and comprehensively understanding the molecular mechanism affecting the linoleic acid content in muscle, providing an important reference for the breeding of slow-type yellow-feathered broiler chickens.

The effects of ketogenic diet on beta-hydroxybutyrate, arachidonic acid, and oxidative stress in pediatric epilepsy

The exact mechanism of a ketogenic diet (KD) as a suitable alternative therapeutic approach for drug-resistant epilepsy (DRE) in alleviating seizures is not yet fully understood. The present study aimed to evaluate the role of the KD in reducing oxidative stress (OS) by increasing the ketone body beta-hydroxybutyrate (BHB) and Arachidonic acid (ARA), an essential polyunsaturated fatty acid, as a possible mechanism in relieving seizure attacks in children with DRE. Forty children with refractory epilepsy were included in the present study. The serum levels of BHB, ARA, and OS markers, malondialdehyde (MDA), and 8-hydroxyl-deoxyguanosine (8-OHdG), were evaluated in children with DRE and compared before and after the three months of KD therapy. Thirty-four of 40 included children could complete the three-month KD therapy. Twenty-one (61.76%) patients had more than a 50% reduction in seizure frequency after the KD (responders). The remaining 13 children were considered non-responders to the diet. The serum levels of ARA and BHB significantly (p < 0.05) increased after the KD therapy. The serum levels of OS parameters MDA and 8-OHdG before the diet therapy were significantly (p < 0.05) higher than those after the administration. The serum levels of BHB and MDA after the KD therapy in the responders were respectively higher and lower than those in the non-responders (p < 0.001). Ketogenic diet might reduce brain OS by increasing BHB and ARA. The role of BHB in diminishing OS and seizure might be more remarkable than ARA.

Bacillus subtilis K-C3 as Potential Starter to Improve Nutritional Components and Quality of Shrimp Paste and Corresponding Changes during Storage at Two Alternative Temperatures

This study aimed to evaluate Bacillus subtilis K-C3 as a potential starter to improve shrimp paste quality, particularly in terms of nutritional profiles. The quality/characteristic changes of shrimp paste with and without inoculation during storage for 18 months when stored at low (4 °C) and room (28 °C) temperature were also investigated. The results found that this B. strain increased essential amino acids (EAAs) and polyunsaturated fatty acids (PUFAs), as well as antioxidant properties including 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azino-bis (3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical scavenging activities, ferric reducing antioxidant power (FRAP) and metal chelating activity in the experimental shrimp paste compared to traditional shrimp paste (p &lt; 0.05). The faster development of some characteristics of inoculated samples were also noted, as indicated by the higher total viable count (TVC), formal and amino nitrogen content, pH, and browning index, as well as biogenic amines, indicating different quality which may be further responsible for different product acceptability. The changes in quality/characteristics of shrimp paste were observed throughout the 18 months of storage. Shrimp paste stored at room temperature accelerated those changes faster than samples stored at low temperature (p &lt; 0.05); however, the quality of them still meets the product’s standard even storage for 18 months. Meanwhile, shrimp paste stored at a low temperature had an amount of yeast and mold over the limitation (&gt;3.00 log CFU/g), indicating food spoilage. Thus, storage at room temperature can extend this product’s shelf-life better than storage at low temperature. Overall, inoculation with B. subtilis K-C3, in conjunction with storage at room temperature, resulted in quality improvement and maintenance in shrimp paste, particularly in the aspects of nutritional profiles and safety concern, as the shrimp paste should have a shelf-life of at least 18 months.

Expression of glycerol-3-phosphate acyltransferase increases non-polar lipid accumulation in Nannochloropsis oceanica

Microalgae are considered a suitable production platform for high-value lipids and oleochemicals. Several species including Nannochloropsis oceanica produce large amounts of essential omega-3 polyunsaturated fatty acids (PUFAs) which are integral components of food and feed and have been associated with health-promoting effects. N. oceanica can further accumulate high contents of non-polar lipids with chemical properties that render them a potential replacement for plant oils such as palm oil. However, biomass and lipid productivities obtained with microalgae need to be improved to reach commercial feasibility. Genetic engineering can improve biomass and lipid productivities, for instance by increasing carbon flux to lipids. Here, we report the overexpression of glycerol-3-phosphate acyltransferase (GPAT) in N. oceanica during favorable growth conditions as a strategy to increase non-polar lipid content. Transformants overproducing either an endogenous (NoGPAT) or a heterologous (Acutodesmus obliquus GPAT) GPAT enzyme targeted to the endoplasmic reticulum had up to 42% and 51% increased non-polar lipid contents, respectively, compared to the wild type. Biomass productivities of transformant strains were not substantially impaired, resulting in lipid productivities that were increased by up to 37% and 42% for NoGPAT and AoGPAT transformants, respectively. When exposed to nutrient stress, transformants and wild type had similar lipid contents, suggesting that GPAT enzyme exerts strong flux control on lipid synthesis in N. oceanica under favorable growth conditions. NoGPAT transformants further accumulated PUFAs in non-polar lipids, reaching a total of 6.8% PUFAs per biomass, an increase of 24% relative to the wild type. Overall, our results indicate that GPAT is an interesting target for engineering of lipid metabolism in microalgae, in order to improve non-polar lipid and PUFAs accumulation in microalgae.

Different Crop Rotations and Residue Levels as They Affect Corn Grain, Residue Production, and Nutrient Concentration

The consumption of corn-based foods is a good alternative for human health due to their high content of proteins, essential amino acids and polyunsaturated fatty acids of the omega-3 family. The present study evaluated the effect of two medium-term canola (Brassica napus L.)-corn (Zea mays L.) and bean (Phaseolus vulgaris L.)-corn rotations with four residue incorporation rates (0%, 50%, 100% and 200% of the preceding crop) on corn grain yield, residue production, nutrient concentration and extraction after two rotation cycles in a volcanic soil of south-central Chile. Results indicated that grain yield ranged from 17.04 to 17.40 Mg ha -1 , and residue production ranged from 16.41 to 16.50 Mg ha -1 , being unaffected by the preceding crop. Residue incorporation rates had no effect on grain yield and residue production. The preceding crop affected the concentration and extraction of some nutrients in grain and residue. Residue rate affected the concentration and extraction of some nutrients in grain only. Ca distribution in corn grain was negatively affected by the preceding bean crop and increased residue incorporation rate. Nutrient concentration in grain ranged from 1.33 to 1.36% for N, 0.33% for P, 0.53 to 0.54% for K, 0.008 to 0.011% for Ca, 0.14% for Mg, and 0.087 to 0.092% for S. The ranking of total macronutrient extraction in the corn crop was K &gt; N &gt; Ca &gt; P &gt; Mg &gt; S. The extraction means ranged from 320.0 to 325.8, 56.0 to 57.1, 364.7 to 373.7, 86.5 to 99.3, 39.4 to 42.4, and 22.6 to 23. 7 kg ha -1 , while grain nutrient partitioning coefficients ranged from 64.5 to 66.8, 90.1 to 90.9, 23.1 to 23.7, 1.3 to 2.0, 50.8 to 57.5, and 60.3 to 60.6 for N, P, K, Ca, Mg, and S, respectively. The use of bean as a previous crop allowed an increase in grain protein content (8.56 vs. 8.30%) with respect to the canola crop.

Dietary n-3 and n-6 polyunsaturated fatty acids differentially modulate the adiponectin and leptinmediated major signaling pathways in visceral and subcutaneous white adipose tissue in high fat diet induced obesity in Wistar rats

Obesity is a chronic metabolic disease that involves excessive accumulation of fat in white adipose tissue (WAT). Apart from storing excess fats, WAT also serves as an important endocrine organ secreting adipocytokines such as adiponectin and leptin. Adiponectin and leptin bind to their transmembrane receptors adiponectin receptor 1 (AdipoR1)/adiponectin receptor 2 (AdipoR2) and Ob-R, respectively, and mediate their effect on metabolism by regulating multiple downstream targets. Dietary fat is considered the main culprit behind obesity development. Numerous preclinical studies have highlighted role of essential polyunsaturated fatty acids (PUFAs), particularly n-3 PUFAs, in prevention of obesity. Despite emerging data, there still is no clear understanding of the mechanism of action of n-3 PUFAs and n-6 PUFAs on adipose tissue function in two functionally and anatomically different depots of WAT: visceral and subcutaneous. We designed this study using a high fat diet (HFD) fed rodent model of obesity to test our hypothesis that n-3 and n-6 PUFAs possibly differentially modulate adipokine secretion and downstream metabolic pathways such as peroxisome proliferator-activated receptor-γ (PPAR-γ), protein kinase B (AKT)-forkhead box O1 (FOXO1), and Janus kinase-signal transducer and activator of transcription in obesity. The results of the current study showed that n-3 PUFAs upregulate the expression of AdipoR1/R2 and ameliorate the effects of HFD by modulating adipogenesis via PPAR-γ and by improving glucose tolerance and lipid metabolism via AKT-FOXO1 axis in fish oil fed rats. However, n-6 PUFAs did not show any remarkable change compared with HFD fed animals. Our study highlights that n-3 PUFAs modulate expression of various targets in adiponectin and leptin signaling cascade, bringing about an overall reduction in obesity and improvement in adipose tissue function in HFD induced obesity.

Gökkuşağı alabalığı rasyonuna eklenen astaksantinin kas dokusu siyalik asit miktarı üzerine etkisinin araştırılması

Astaxanthin is an oxidized carotenoid component responsible for pigmentation, protecting essential polyunsaturated fatty acids from oxidation, immune response, communication, reproductive behavior, and improved reproduction in aquatic animals. In aquaculture, astaxanthin is a pigment used to give rainbow trout flesh its distinctive pinkish tint. Sialic acid is an alpha-keto acid monosaccharide with a nine-carbon backbone that is an acylated derivative of neuraminic acid and a terminal component of the oligosaccharide chains of many glycoproteins and glycolipids. It impacts cell recognition, communication, signaling, cellular aggregation and development, infections, tumor growth and metastasis, immunology, reproductive biology, and neurology. Forty female rainbow trout were used in the study. Fish were divided into two groups. The experimental group (n=20) received a daily dose of astaxanthin of 50 ppm/day for 225 days, whereas the control group (n=20) received a standard fish meal. The concentration of sialic acid in fish muscle tissue was evaluated using the enzyme-linked immunosorbent assay (ELISA) method. The sialic acid level in muscle tissue of fish fed a standard fish ration was 111.97 ± 4.56 µg/g, while the sialic acid level in muscle tissue of fish fed astaxanthin was 110.33 ± 8.54 µg/g. In our research, we found that adding astaxanthin to the fish diet had no effect on the amount of sialic acid in the fish, which is crucial in human nutrition. As a result, it was revealed that dietary astaxanthin did not influence the level of sialic acid in fish muscle tissue (p&gt;0.05).

Shark liver and flaxseed oils as alternatives to soybean oil in the lipid quality of Japanese quail eggs

PurposeThe objective of this study was to assess the incorporation of polyunsaturated omega 3 and omega 6 fatty acids in the eggs of Japanese quails (Coturnix coturnix japonica) fed with soybean, flaxseed and shark liver oils, as well as to assess their effects on the chemical composition and lipid quality of the yolks.Design/methodology/approachThe total of 252 units of quails were distributed in a completely randomized design with seven treatments and six replications, totaling 42 experimental design units. The sources of oils and their inclusions in the experimental diet were 2% of soybean oil (S), 2% of flaxseed oil (L) and 2% shark liver oil (T), obtained from the species Carcharhinus acronotus, and the mixtures of 1% S + 1% L (SL); 1% S + 1% T (ST); 1% L + 1% T (LT) and 0.67% S + 0.67% L + 0.67% T (SLT).FindingsThe proximate composition of the egg yolk was not changed to the supplementation of lipid sources added in quail diet. The total replacement of soybean oil by shark liver oil reduced the cholesterol content in the yolk by 19% (T = 282.97 mg cholesterol/100 g egg) and the addition of flaxseed oil produced eggs with greater amount of polyunsaturated fatty acids (PUFAs) (LS = 18.32%). The treatments with flaxseed oil and its mixtures (soybean oil + flaxseed oil and flaxseed oil + shark liver oil) effectively contributed to reducing the ω-6:ω-3 ratio and enriching the quail eggs with PUFAs, especially linolenic acid (18: 3n3c) and EPA (20: 5n3c).Originality/valueThus, manipulation in the diet of quails enriched the content of essential PUFAs and reduced the cholesterol content in the yolk. The flaxseed oil was the lipid source that influenced to improve the quality of the egg yolk. These results have practical applicability for the quail egg industry.

Пряно-ароматические и эфирно-масличные культуры: урожайность и жирнокислотный состав семян

Spices, herbs, and essential-oil plants provide a lot of marketable products, e.g., green mash, seeds, essential oils, etc. These raw materials find application in food industry, pharmacy, perfumery, traditional and folk medicine, landscape gardening, etc. The research objective was to test some new varieties of spices, aromatic herbs, and essential oil crops for their yield and fatty acid composition.&#x0D; The study featured new varieties of medicinal hyssop (Hyssopus officinalis L.), oregano (Origanum vulgare L.), basil (Ocimum basilicum L.), tulsi (Ocimum tenuiflorum L.), garlic chives (Allium odorum L.), rue (Ruta graveolens L.), blue fenugreek (Trigonella caerulea (L.) Ser.), and big-root geranium (Geranium macrorrhizum L.). The yield of green mass and seeds was studied on the experimental field of the Belarusian State Agricultural Academy according to standard methods. A set of standard laboratory procedures made it possible to define the content of crude fat, while the fatty acid composition of seed lipids was studied by gas chromatography in extracts of methyl esters of fatty acids.&#x0D; The green mass yield was 150–280 c/ha, whereas the seed yield was 0.5–4.0 c/ha; the crude fat content was 1.15–3.37 and 1.62–9.81%, respectively. The fatty acid composition of seed lipids included caprylic, palmitic, stearic, oleic, linoleic, and α-linolenic acids. The highest content of polyunsaturated essential fatty acids represented by linoleic and α-linolenic acids was observed in oregano (86.74–87.27%), hyssop (76.41–85.96%), tulsi (85.67%), basil (72.52–80.72%), rue (78.04%), and blue fenugreek (72.96%).&#x0D; The specified yield and fatty acid composition provided a complete assessment of spices, herbs, and essential-oil plants with the prospect of their use as part of new functional products.

Invasive Crayfish Faxonius limosus: Meat Safety, Nutritional Quality and Sensory Profile.

The aim of the present study was to evaluate the safety parameters, nutritional value and sensory profile of the meat from spiny-cheek crayfish (Faxonius limosus), captured from the Danube River in Serbia. To achieve this, we determined their microbiological safety, chemical composition, minerals and heavy metals, fatty acid and amino acid profile, as well as a sensory profile of the meat. The obtained results showed that the meat from crayfish was microbiologically safe. Crayfish meat has a high nutritional quality, high protein content (18.12%) and a total of 17 detected amino acids, of which essential amino acids constituted 6.96 g/100 g sample. Additionally, the crayfish meat was characterized by high levels of essential polyunsaturated fatty acids (PUFA), particularly n-3 PUFA, at an optimal ratio of n-3/n-6 and with low values of atherogenic and thrombogenic indices. Predominant macrominerals in the meat are K, followed by Na, Ca, P and Mg, whereas the content of microminerals was in the following order: Zn &gt; Cu &gt; Fe &gt; Mn. The concentrations of accumulated toxic metals (Cd, Pb, As and Hg) did not exceed the maximum allowed levels. Sensory analysis confirmed that the meat from spiny-cheek crayfish has the potential to become a new food source of essential nutrients.

Labelling of eicosapentaenoic acid with stable isotope 13C in the marine bacterium Shewanella marinintestina

Eicosapentaenoic acid (EPA) is an essential omega-3 polyunsaturated fatty acid that plays a critical role in marine life. It is present in several marine animals, including fish, but the primary producers of EPA are phytoplankton and specific marine bacteria. Although most of the EPA present in marine animals come from phytoplankton, the bacterial input into the marine EPA food web is still unknown. The labelling of EPA within a bacterial strain could be a viable strategy to help revealing this contribution. In this work, Shewanella marinintestina IRL 567, a marine bacterium isolated from fish guts and known to produce EPA, was labelled with the stable isotope 13C at small (250-mL shake flask), bench (2.5-L shake flask), and pilot scale (50-L stirred tank bioreactor). Growing the bacterium with 13C-acetate in the culture medium demonstrated that EPA was de-novo synthesized utilizing acetate as precursor. 13C incorporation into the EPA molecule resulted in values as high as 95.5% of the synthesized EPA being labelled in small scale, 95.9% in bench scale and 91.5% in pilot scale. This simple method to label EPA proved to be effective and therefore it could be a valuable tool to follow the fate of bacterial EPA into higher trophic levels.