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Fatty acids resources:

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Br J Nutr. 2002 Mar;87(3):211-7.
Functional characterization of three clones of the human intestinal Caco-2 cell line for dietary lipid processing.

Salvini S, Charbonnier M, Defoort C, Alquier C, Lairon D.

Unite 476 INSERM, Nutrition humaine et lipides, Marseille, France.

We aimed to improve the use of the human intestinal Caco-2 cell line for studying dietary lipid and cholesterol processing by using isolated pure clones (Chantret et al. 1994). Three clones (TC7, PD7 and PF11) were grown as monolayers on semi-permeable filters and compared for cell viability, fatty acid and cholesterol apical uptake or basolateral secretion, apolipoprotein B-48 basolateral secretion and 3-hydroxy-3-methylglutaryl (HMG)-CoA reductase activity. The TC7 clone showed the best viability upon apical incubation with mixed micelles and should be preferred for routine work. Short-term (3.0 h) rates of apical uptake of cholesterol were not different with the three clones, whereas the rate of apical uptake of oleic acid (18:1) was lower (P<0.05) with PF11 (250.6 nmol/mg) and the basolateral secretion of cholesterol and oleic acid was lower with the TC7 clone (0.40 and 29.1 nmol/mg respectively). The secretion of apolipoprotein B-48 basolaterally was about 2-fold lower than from PD7 clone. The basal levels of HMG-CoA reductase activity were significantly different (P<0.05; TC7>PF11 >PD7). The down-regulation of the enzyme activity was moderate (range 13.8-21.0%) and comparable in the presence of apical micellar cholesterol, but was much marked upon basolateral incubation with LDL (range 34.0-53.6%), especially for the PD7 clone. In conclusion, the Caco-2 clones characterized here proved to be particularly suitable for studying lipid nutrients processing. Because these three clones exhibit some different metabolic capabilities, they provide a new tool to study intestinal response to lipid nutrients.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12064329&dopt=Abstract

Br J Nutr. 2002 Mar;87(3):247-52.
The effect of maternal smoking and ethanol on fatty acid transport by the human placenta.

Haggarty P, Abramovich DR, Page K.

Rowett Research Institute, Aberdeen, Scotland, UK. p.haggartbdn.ac.uk

The role of the placenta in controlling the supply of fatty acids to the fetus was investigated in term placentas from non-smokers (n 5), smokers (>ten cigarettes/d; n 5) and after addition of ethanol at 2 mg/ml (n 4). The maternal side was of the placenta was perfused ex vivo for 90 min with a physiological mixture of fatty acids and fatty acid:human albumin ratio. There was no effect of smoking on the transfer of linoleic (LA, 18: 2 n-6), alpha-linolenic (alphaLN, 18: 3 n-3), arachidonic (AA, 20: 4 n-6) or docosahexaenoic acid (DHA, 22: 6 n-3), expressed per perfused area (calculated from H2(18)O exchange). However, the presence of ethanol in the perfusate at a concentration of 2 mg/ml significantly reduced (P<0.01) the absolute rate of transfer of the two n-3 polyunsaturated fatty acids, alphaLN and DHA. This specific effect of ethanol on alphaLN and DHA also resulted in an altered selectivity for transfer of individual fatty acids. In the non-smoking control group the placenta selectively transferred polyunsaturated fatty acids to the fetus in the order DHA > AA > alphaLN > LA. The order of selectivity was unaltered in placentas from smokers, but the addition of ethanol to the perfusion medium altered the order of selectivity to AA > alphaLN > LA > DHA. The presence of ethanol in the perfusate was also associated with a significant reduction (P<0.05) in the clearance of H2(18)O. These results suggest that the presence of ethanol at a concentration of 2mg/ml may reduce the availability of polyunsaturated fatty acids to the developing fetus.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12064333&dopt=Abstract

Br J Nutr. 2002 Apr;87(4):281-9.
Differential effects of n-3 and n-6 polyunsaturated fatty acids on BRCA1 and BRCA2 gene expression in breast cell lines.

Bernard-Gallon DJ, Vissac-Sabatier C, Antoine-Vincent D, Rio PG, Maurizis JC, Fustier P, Bignon YJ.

Laboratoire d'Oncologie Moleculaire, Centre Jean Perrin, Clermont-Ferrand, France.

Current evidence strongly supports a role for the breast tumour suppressor genes, BRCA1 and BRCA2, in both normal development and carcinogenesis. In vitro observations reported that BRCA1 and BRCA2 are expressed in a cell cycle-dependent manner. Interestingly, differences in the actions of n-3 and n-6 polyunsaturated fatty acids have been observed: while the n-3 polyunsaturated fatty acids have been described to reduce pathological cell growth, the n-6 polyunsaturated fatty acids have been found to induce tumour proliferation. Here, we examined the expression of BRCA1 and BRCA2 in breast cell lines after treatment with polyunsaturated fatty acids. Real-time quantitative polymerase chain reaction determinations conclusively demonstrated increases in BRCA1 and BRCA2 mRNA expressions in MCF7 and MDA-MB 231 tumour cell lines after treatment with n-3 polyunsaturated fatty acids (eicosapentaenoic acid and docosahexaenoic acid), but no variation was noticed with the n-6 polyunsaturated fatty acid (arachidonic acid). On the other hand, no variation of the expression of BRCA1 and BRCA2 mRNA was detected in MCF10a normal breast cell line treated by polyunsaturated fatty acids. The level of BRCA1 and BRCA2 proteins quantified by affinity chromatography remained unchanged in tumour (MCF7, MDA-MB 231) and normal (MCF10a) breast cell lines. We suggest the presence of a possible transcriptional or post-transcriptional regulation of BRCA1 and BRCA2 after n-3 polyunsaturated fatty acid treatment in breast tumour cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12064337&dopt=Abstract

Br J Nutr. 2002 Apr;87(4):375-82.
The effects of dietary lipids on adrenergically-stimulated lipolysis in perinodal adipose tissue following prolonged activation of a single lymph node.

Mattacks CA, Sadler D, Pond CM.

Department of Biological Sciences, The Open University, Milton Keys, Bucks, UK.

The effects of feeding beef suet (mostly saturated and monoenoic fatty acids), sunflower oil (rich in n-6 fatty acids) and fish oil (rich in n-3 fatty acids) on the response of mesenteric, omental, popliteal and perirenal adipocytes to experimentally-induced local inflammation were studied in adult guinea pigs. After 6 weeks on the experimental diets, the animals were fed standard chow, and lipopolysaccharide was injected unilaterally daily for 4 d to induce swelling of one popliteal lymph node. Basal lipolysis in the perinodal adipocytes of all depots studied was higher in the sunflower oil-fed animals than in the controls fed on standard chow, and lower in those fed on suet or fish oil. Dietary lipids altered rates of lipolysis during incubation with l0(-5) M noradrenaline in all samples studied from the locally-activated popliteal depot, but only in adipocytes within 5 mm of a large lymph node in the other depots. The fish-oil diet attenuated the spread of increased lipolysis within the locally-activated popliteal adipose tissue, and from this depot to other node-containing depots. These experiments show that n-6 polyunsaturated fatty acids promote and n-3 fatty acids suppress the spread of immune activation to adipocytes within and between depots, and alter the sensitivity of perinodal adipocytes to noradrenaline. Dietary effects are reduced or absent in adipocytes in sites remote from lymph nodes, and thus such samples do not adequately represent processes in perinodal adipose tissue. These results are consistent with the hypothesis that perinodal adipocytes interact with adjacent lymphoid cells during immune responses.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12064347&dopt=Abstract

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