The objective of the current study was to investigate the effects of dietary ${\omega}-6/{\omega}-3$ polyunsaturated fatty acid (PUFA) ratios on lipid metabolism in goslings. One hundred and sixty 21-day-old Yangzhou geese of similar weight were randomly divided into 4 groups. They were fed different PUFA-supplemented diets (the 4 diets had ${\omega}-6/{\omega}-3$ PUFA ratios of 12:1, 9:1, 6:1, or 3:1). The geese were slaughtered and samples of liver and muscle were collected at day 70. The activities and the gene expression of enzymes involved in lipid metabolism were measured. The results show that the activities of acetyl coenzyme A carboxylase (ACC), malic enzyme (ME), and fatty acid synthase (FAS) were lower (p<0.05), but the activities of hepatic lipase (HL) and lipoprotein lipase (LPL) were higher (p<0.05), in the liver and the muscle from the 3:1 and 6:1 groups compared with those in the 9:1 and 12:1 groups. Expression of the genes for FAS (p<0.01), ME (p<0.01) and ACC (p<0.05) were higher in the muscle of groups fed diets with higher ${\omega}-6/{\omega}-3$ PUFA ratios. Additionally, in situ hybridization tests showed that the expression intensities of the high density lipoprotein (HDL-R) gene in the 12:1 and 9:1 groups were significantly lower (p<0.01) than that of the 3:1 group in the muscle of goslings. In conclusion, diets containing lower ${\omega}-6/{\omega}-3$ PUFA ratios (3:1 or 6:1) could decrease fat deposition by inhibiting fat synthesis in goslings.
The change in fatty acid composition in brain tissue of the second generation rats(Sprague-Dawley strain) was studied using four different fat diets(Corn oil=CO, Soybean oil=SO, Perilla oil=PO, Fish oil=FO, 10% by Wt). The experimental diets were started from pregnancy in four different groups, each consisting of 9 rats. The seound generation rats were fed the same diet as their mothers. Animals were anesthetized with ether at 0, 3, 9 & 16 weeks of age. Whole brains were dissected out, brain tissues were, then, homogenized and lipids were extracted from brain tissues. The fatty acid compositions were measured after methylation by gas-liquid chromatography at 0, 3, 9 and 16 weeks of age of offspring. The changes in the relative concentrations of polyunsaturated fatty acids(PUFA) or more specifically docosahexaenoic acid(22 : 6, $\omega$3, DHA), the major $\omega$3 fatty acid component in rat brain at different age were similar to changes in the amount of DNA in brain tissue showing the maximum value during the lactation. The changes in saturated fatty acid(SFA) content showed a contrasting patten to those of PUFA, while monounsaturated fatty acid(MUFA) increased steadily throughout the experimental period. At birth, the relative concentrations of $\omega$3 series fatty acids the relative concentrations of PUFA, MUFA and SFA converged to very similar values respectively regardless of the dietary fatty acid compositions. In brain tissue, it is of value to note that while changes in relative concentrations of linoleic acid (18 : 2, $\omega$6, LA) and arachidonic acid(20 : 4, $\omega$6, AA) showed a precursor-product-like relationship, $\alpha$-linolenic acid(18 : 3, $\omega$3, $\alpha$-LnA) and DHA showed a different pattern. Even when the $\omega$3 fatty acid content in very low in maternal diet(CO), the second generation rat brain tissues appeared to secure DHA content, suggesting an essential role of this fatty acid in the brain. The fact that a large amount of $\alpha$-LnA in the maternal diet did not have a significant effect on the second generation rat brain $\alpha$-LnA content, indicated that DHA seemed essential component for the brain development in our experimental condition. In all groups, the relative content of $\alpha$-LnA in the brain tissues remained relatively constant throughout the experimental period at the very low level. The study of the specific concentrations and essential role(s) of DHA in each parts of brain tissue is needed in more details.
This study was carried out to evaluate the fatty acid intakes of employees in employee feeding operations in Seoul and to provide prudent dietary guidelines with special concern on dietary fat. Four establishments were selected in large scale group and other four were selected as small scale group according to feeding numbers and food cost. Food intake was measured by substracting the leftover from the averaged portion amount. The leftover was measured by the modified aggregate selection plate waste measurement technique. The results were as follows : Employees from the large scale institution consumed more energy, protein, carbohydrate and niacin compared to those from the small scale institution(p<0.05). The mean calorie compositions of carbohydrate, protein and fat of all subjects were 66.7, 16.4 and 16.9%. The mean fat intake was 12.1g/lunch. Linoleic acid(C18:2 $\omega$6, 3.67g) was the most abundant fatty acid contained in the diet, followed by oleic acid (C18:1 $\omega$9, 3.53g) and palmitic acid(C16:0, 1.83g). The subjects consumed 5.2g polyunsaturated fatty acids(PUFA), 4.6g monounsaturated fatty acid(MUFA), 3.2g saturated fatty acid(SFA) per lunch per person. The average ratios of P/M/S and $\omega$6/$\omega$3 fatty acids were 1.6/1.5/1.0 and 8.5/1/0., respectively. the dietary $\omega$3 fatty acid status can be improved, even though the ratios found belong to the desirable range, by including $\omega$3 fatty acid rich-foods such as bean products and seafoods more frequently in the diet. Caution is needed for higher unsaturated nature of $\omega$3 series fatty acids to be prevented from peroxidation.
Objectives : Epidemiological studies in other countries show that a low intake of omega-3 fatty acids (FAs) increases the risk of depression or suicidality. However, no studies have investigated the associations of suicidality with omega-3 FAs in Korea. Hence, this cross-sectional study aimed to investigate the effects of omega FAs on suicidality in the general South Korean population. Methods : The data in this study were sourced from adults (n=215,860) who completed the Sixth Korea National Health and Nutrition Examination Survey (KNHANES VI), and the associations between omega FAs and suicidality were analyzed using multivariate logistic regressions. Results : Our results demonstrated that high omega-3 FA intake was associated with a decreased risk of suicide (OR=0.83, 95% CI : 0.71-0.98) and the high omega-6 to omega-3 FA ratio was associated with an increased risk of suicide (OR=1.25, 95% CI : 1.02-1.54). Additionally, a high intake of omega-3 FAs was associated with a decreased risk of suicide in men, but not in women (OR=0.72, 95% CI : 0.59-0.88). Conclusions : Overall, our findings suggest that a lower intake of omega-3 FA is associated with the increased risk of suicidality in the general Korean population, especially in men.
The effects of feeding diets with different fatty acids on the composition of fatty acids and vitamin E status in maternal milk & serum and pup's serum were studied. Dietary fats(10% by wt) include on oil(CO), soybean oil(SO), perilla seed oil(PO : about 60% , C18 : 3 $\omega$3) and fish oil(FO : rich in C20 : 5$\omega$3, eicosapentaenoic acid = EPA & 22 : 6$\omega$3, docosahexaenoic acid = DHA), Sprague-Dawley rats weighing 200-250g, were fed experimental diets from pregnancy through lactation period. Maternal milk was obtained by gentle squeezing after 30 minutes of oxytocin(0.2 IU, intraperitoneal) injection. The fatty acid compositions of milk and serum were analyzed at day-2 and day-15. The concentrations of vitamin E in maternal milk and serum and pup's serum were also analyzed. The groups of CO, SO and PO which had no DHA in their diet, contained DHA in their milk, The rations of EPA+DHA/arachidonic acid(AA) were higher in PO group than those in either CO or SO group. This seemed to be due not only to more conversion from C18 : 3$\omega$3 to C20 : 5$\omega$3 and C22 : 6$\omega$3 but also to inhibition of C18 : 2$\omega$6 conversion to C20 : 4$\omega$6. More DHA was found in day-2 milk than in day-15 milk. It was also noted that milk contained more DHA was found in day-2 milk than in day-15 milk. It was also noted that milk contained more DHA than serum and this difference was larger in day-2 than in day-15 milk. Even though the concentrations of vitamin E both in maternal serum and milk were lower in PO and FO groups fed highly unsaturated fat than in CO or SO groups, pup's serum did not show a significant difference among all the experimental groups indicating that the pups man secure their essential nutrients by the biomagnification mechanism.
Effect of oral taurine supplementation on plasma total and phospholidpid -fatty acid profiles and their metabolism were evaluated in healthy female adults. Among twenty five female volunteers(23.6$\pm$0.3 years old ) participated in the taruine supplementation program(6g taurine /day), twenty four subjects succesfully completed the 2 week program , and only nine subjects continued to take taurine for another 2 weeks. Levels of plasma fatty acids and taruine were measured by gas-liquid chromatobraphy and an automated amino acid analyzer based on ion exchange chromatography, respectively. Plasma taurine concentration s of the subjects were 108. 7$\pm$3.4 , 184.2$\pm$8.2 and 235.9$\pm$77.0$\mu$emol/L at 0 , 2 and 4 weeks of taurine supplementation. Fatty acid compositions and elongation and desaturation indices of polyunsaturated fatty acids (PUFA) in plasma total lipids were not influenced by oral taurine supplementation. However, fatty acid compositions and their metabolism in plasma phospholipids were significantly affected by taurine supplementation in female adults. Compared to the values for 0 week, the percentage of saturated fatty acids (SFA) in plasma phospholipid was significantly lowered at 2 weeks, but elevated at 4 weeks of taurine supplementation. In contrast , the percentage of phospholipid PUFA significantly increased at 2 weeks and decreased at 4 weeks of taurine supplementation from to the values for 0 weeks. Foru weeks of oral taurine supplementation signifinatly elevated the eongation index(20 : 4$\omega$6 ⇒22 : 4 $\omega$6, p<0.01), and decreased the desaturation index (20 : 3 $\omega$6 ⇒20 : 4 $\omega$6 , p<0.01) of $\omega$6 fatty acids in plasma phospholipids. Plasma taurine concentration was positively correlated with the percentage of 14 : 0 fatty acids and the enlongation index o f$\omega$3 fatty acids(20 : 5 $\omega$3 ⇒22 : 5 $\omega$3), and thenegatively correlated with the percentage of 20 : 0 in plasma phospholipids. These results indicate that oral taurine supplementation for 4 weeks signidicantly elelvated the percentage of SFA, and lowered the percentage of PUFA in plasma phospholipids with no influence on plasm total fatty aicd composition in healthy female adults.
The lipids of ten major fishes caught in Korean seas were analyzed for fatty acid composition and for the content of $\omega-3$ polyunsaturated fatty acids. The major fatty acids present were hexadecanoic acid $(14{\sim}24%)$, hexadecenoic acid $(4{\sim}13%)$, octadecenoic acid $(8{\sim}29%)$, eicospentaenoic acid $(4{\sim}18%)$ and docosahexenoic acid $(6{\sim}33%)$. The ${\omega}-3$ polyunsturated fatty acids ranged from 18% to 48% of the total fatty acids depending on the species. The content of eicosapentaenoic acid was relatively high in sardine, gizzard shad and atka fish on the basic of fresh body weight, while that of docosahexaenoic acid was highest in hair tail and followed by atka fish and sardine.
This study was conducted to compare the lipid content and fatty acid composition of the Korean breast milk produced at 1, 2 and 3 months postpartum with the infant formula produced in Korea. The content of total lipids of the breast milk was low compared with the other data of Korean as well as foreign breast milk, and the content tended to reduce during the progress of lactation. The composition of fatty acids of the breast milk was characterized by low saturated fatty acids(SFA) and high $\omega$3 series of polyunsaturated fatty acids (PUFA), especially 20:5 and 22:6, so the P/S and $\omega$6/$\omega$3 rations were high. The formulas had more total lipids, triglycerides(TG) and phospholipids and less cholesterol(CHOL) and free fatty acids than the breast milk. The cholesterol content of the formulas was around 50% of that of the breast milk, so the CHOL/TG ratio was low. Although the formulas varied in fatty acid composition, the formulas had more SFA and $\omega$6 series of PUFA, but less monounsaturated fatty acids and $\omega$3 series of PUFA than the breast milk. This study shows that there are some differences in lipid content and fatty acid composition between breast milk and infant formula. Therefore, further studies needed to investigate the physiological effect of this difference on lipid metabolism of infants.
This study evaluated the effects of chronic ethanol consumption and/or taurine supplementation on hepatic total, phospholipid fatty acid composition and the metabolism of rats fed one of three purified liquid diets for 8 weeks. the rats followed either the control diet (CD, ethanol-free and taurine-free diet); ethanol diet (ED, CD+ 50g ethanol/L) or ethanol-taurine diet (ETD, ED+3.75g taurne/L). Chronic ethanol consumption and/or dietary taurine supplementation were associated with altered hepatic total and phospholipid fatty acid composition. compared to the values for the control rats, ED or ETD significantly decreased the percentage of total monounsaturated fatty acids ($\Sigma$MUFA), and increased the percentage of total polyunsaturated fatty acids ($\Sigma$PUFA) of hepatic total lipids(p〈0.01). Percentages of 14:0(P〈0.01) and 16:0(p〈0.001) were sigificantly lower, and those of 18:0(p〈0.01), 20:0(p〈0.001), 20:3$\omega$6(p〈0.01) and 22:4$\omega$6(p〈0.01) in hepatic total fatty acid compositions were oserved in rats fed ETD versus those fed ED or ETD. No significant differences in hepatic total fatty acid compositions were observed in rats fed ETD versus those fed ED. Percentages of 24:0(p〈0.01), 16:1(p〈0.05), 20:1(p〈0.01), 18:2$\omega$6(p〈0.01) and 18:3$\omega$3(p〈0.05) in hepati phospholipids were significantly higher, and those of 14:0(p〈0.01), 16:0(p〈0.001), 20:3$\omega$3(p〈0.05) in hepatic phospholipids were significantly higher, and those of 14:0(p〈0.01), 16:0(p〈0.001), 20:3$\omega$3(p〈0.001), 22:6$\omega$3(p〈0.001) and $\Sigma$$\omega$3(P〈0.001) were significantly lower in rats fed ED or ETD compared to the values for the control rats. The Δ5 desaturation index(20:3$\omega$6⇒20:4$\omega$6) and elongation index (20:5$\omega$3⇒22:5$\omega$3) of hepatic phospholipid index (20:3$\omega$6⇒20:4$\omega$6) and decreased Δ4 desaturation index (22:5$\omega$3⇒22:6$\omega$3) compared to the values for the ED rats. These changes in hepatic fatty acid composition induced by chronic ethanol consumption and/or taurine supplementation might be associated with the modulations of physical properties of the hepatic cell membrane and its sensitivity to peroxidation damage.
BACKGROUND/OBJECTIVES: The aim of this research was to study the different long term effects of consumption of dietary oil sources with varying omega-6/omega-3 (${\omega}-6/{\omega}-3$) polyunsaturated fatty acids (PUFAs) ratios on bone marrow fatty acid level, ex vivo prostaglandin $E_2$ ($PGE_2$) release, and mineral content of bone in rabbits. MATERIALS/METHODS: For this purpose, weaning and female New Zealand white rabbits were purchased and randomly divided into five groups and offered ad libitum diets containing 70 g/kg of added oil for 100 days. The dietary lipid treatments were formulated to provide the following ratios of ${\omega}-6/{\omega}-3$ fatty acids: 8.68 soy bean oil (SBO control), 21.75 sesame oil (SO), 0.39 fish oil (FO), 0.63 algae oil (DHA), and 0.68 algae oils (DHA/ARA). DHA and ARA are two types of marine microalgae of the genus Crypthecodinium cohnii. RESULTS: The dietary treatments had significant effects on the bone marrow fatty acids of rabbits. Rabbits fed the FO diet, containing the highest ${\omega}-3$ PUFA concentration, and those fed the SBO diet showed the highest ${\omega}-6$ PUFA. On the other hand, a positive correlation was observed between Ex vivo $PGE_2$ level and the ${\omega}-6/{\omega}-3$ dietary ratio. Significant effects of dietary treatment on femur Ca, P, Mg, and Zn contents were observed in both genders. CONCLUSIONS: Findings of the current study clearly demonstrated that dietary PUFA, particularly ${\omega}-6/{\omega}-3$ and ARA/EPA ratios are important factors in determining bone marrow fatty acid profile, and this in turn determines the capacity of bone for synthesis of $PGE_2$, thereby reducing bone resorption and improving bone mass during growth.
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