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Fatty acids resources:

Fatty acids research abs 1 || Fatty acids research abs 2 || Fatty acids research abs 3 || Fatty acids research abs 4





Biochemistry. 2001 Jan 30;40(4):977-86.
Kinetic model of protein-mediated ligand transport: influence of soluble binding proteins on the intermembrane diffusion of a fluorescent fatty acid.

Zucker SD.

Division of Digestive Diseases, University of Cincinnati, Cincinnati, Ohio 45267-0595, USA. zuckersmail.uc.edu

The mechanism (or mechanisms) whereby fatty acids and other amphipathic compounds are transported from the plasma membrane to intracellular sites of biotransformation remains poorly defined. In an attempt to better characterize the role of cytosolic binding proteins in this process, a kinetic model of intermembrane ligand transport was developed in which diffusional transfer of ligand between membrane and protein is assumed. The model was tested by utilizing stopped-flow techniques to monitor the transfer of the fluorescent fatty acid analogue, 12-anthroyloxy stearate (12-AS), between model membrane vesicles. Studies were conducted in the presence or absence of bovine serum albumin (BSA), liver fatty acid-binding protein (L-FABP), and intestinal fatty acid-binding protein (I-FABP) in order to determine the effect of soluble proteins on the rate of intermembrane ligand transfer. As predicted by the model, the initial velocity of 12-AS arrival at the acceptor membrane increases in an asymptotic manner with the acceptor concentration. Furthermore, probe transfer velocity was found to decline asymptotically with increasing concentrations of BSA or L-FABP, proteins that exhibit diffusional transfer kinetics. This observation was found to hold true independent of whether donor or acceptor vesicles were preequilibrated with the protein. In contrast, 12-AS transfer velocity exhibited a linear correlation with the concentration of I-FABP, a protein that is thought to transport fatty acids, at least in part, via a collisional mechanism. Taken together, these findings validate the derived kinetic model of protein-mediated ligand transport and further suggest that the mechanism of ligand-protein interaction is a key determinant of the effect of cytosolic proteins on intracellular ligand diffusion.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11170419&dopt=Abstract



Biochemistry. 2001 Jan 30;40(4):1070-6.
Binding of cytochrome P450 monooxygenase and lipoxygenase pathway products by heart fatty acid-binding protein.

Widstrom RL, Norris AW, Spector AA.

Department of Biochemistry, University of Iowa College of Medicine, Iowa City, Iowa 52242, USA.

Arachidonic acid metabolism by lipoxygenases and cytochrome P450 monooxygenases produces regioisomeric hydroperoxyeicosatetraenoic acids (HPETEs), hydroxyeicosatetraenoic acids (HETEs), epoxyeicosatrienoic acids (EETs), and dihydroxyeicosatrienoic acids (DHETs), which serve as components of cell signaling cascades. Intracellular fatty acid-binding proteins (FABPs) may differentially bind these nonprostanoid oxygenated fatty acids, thus modulating their metabolism and activities. Vascular cells, which express heart FABP (H-FABP), utilize oxygenated fatty acids for regulation of vascular tone. Therefore, the relative affinities of H-FABP for several isomeric series of these compounds were measured by fluorescent displacement of 1-anilinonaphthalene-8-sulfonic acid (ANS). In general, H-FABP rank order affinities (arachidonic acid > EETs > HETEs > DHETs) paralleled reversed-phase high-performance liquid chromatography retention times, indicating that the differences in H-FABP affinity were determined largely by polarity. H-FABP displayed a similar rank order of affinity for compounds derived from linoleic acid. H-FABP affinity for 20-HETE [apparent dissociation constant (K(d)') of 0.44 microM] was much greater than expected from its polarity, indicating unique binding interactions for this HETE. H-FABP affinity for 5,6-EET and 11,12-EET (K(d)' of approximately 0.4 microM) was approximately 20-fold greater than for DHETs (K(d)' of approximately 8 microM). The homologous proteins, liver FABP and intestinal FABP, also displayed selective affinity for EET versus DHET. Thus, FABP binding of EETs may facilitate their intracellular retention whereas the lack of FABP affinity for DHETs may partially explain their release from cells. The affinity of H-FABP for EETs suggests that this family of intracellular proteins may modulate the metabolism, activities, and targeting of these potent eicosanoid biomediators.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11170430&dopt=Abstract



J Agric Food Chem. 2001 Jan;49(1):67-71.
Fatty acid steryl, stanyl, and steroid esters by esterification and transesterification in vacuo using Candida rugosa lipase as catalyst.

Weber N, Weitkamp P, Mukherjee KD.

Institute for Biochemistry and Technology of Lipids, H. P. Kaufmann-Institute, Federal Centre for Cereal, Potato and Lipid Research, Piusallee 68, D-48147 Munster, Germany.

Sterols (sitosterol, cholesterol, stigmasterol, ergosterol, and 7-dehydrocholesterol) and sitostanol have been converted in high to near-quantitative yields to the corresponding long-chain acyl esters via esterification with fatty acids or transesterification with methyl esters of fatty acids or triacylglycerols using lipase from Candida rugosa as biocatalyst in vacuo (20-40 mbar) at 40 degrees C. Neither organic solvent nor water is added in these reactions. Under similar conditions, cholesterol has been converted to cholesteryl butyrate and steroids (5alpha-pregnan-3beta-ol-20-one or 5-pregnen-3beta-ol-20-one) have been converted to their propionic acid esters, both in moderate to high yields, via transesterification with tributyrin and tripropionin, respectively. Reaction parameters studied in esterification include the temperature and the molar ratio of the substrates as well as the amount and reuse properties of the C. rugosa lipase. Lipases from porcine pancreas, Rhizopus arrhizus, and Chromobacterium viscosum are quite ineffective as biocatalysts for the esterification of cholesterol with oleic acid under the above conditions.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11170561&dopt=Abstract



J Agric Food Chem. 2001 Jan;49(1):349-54.
Gamma-linolenic acid and tocopherol contents in the seed oil of 47 accessions from several Ribes species.

Goffman FD, Galletti S.

Institute of Agronomy and Plant Breeding, Georg-August-University of, Von-Siebold-Strasse 8, 37075 Gottingen, Germany. fgoffmaail.agro.uba.ar

Gamma-linolenic acid is an essential fatty acid for humans with delta-6-desaturase deficiency; it is a precursor of prostaglandins, prostacyclins, and tromboxanes; and it has antiinflammatory and antitumoral effects. Tocopherols are natural antioxidants with biological activity, heart/vascular, and cancer protective properties. The oil, gamma-linolenic acid, and tocopherol contents, as well as tocopherol composition, were investigated in the seed oil of a collection of 47 accessions belonging to various species of the genus Ribes. Differences for oil content among species were not significant. The highest total tocopherol content was found in R. nigrum (mean, 1716 mg kg(-1) oil), followed by R. rubrum (mean, 1442 mg kg(-1) oil). R. grossularia showed the lowest values for this trait (mean, 786 mg kg(-1) oil). The three species also differed strongly for tocopherol composition. R. rubrumwas distinguished by a higher concentration of delta-tocopherol (mean, 20.2%); R. grossularia displayed the highest percentage of gamma-tocopherol (mean, 70.0%), and R. nigrum showed the highest concentration for alpha-tocopherol (mean, 34.8%), the most biologically active among the four tocopherols. Regarding gamma-linolenic acid, the highest content was found in R. nigrum, which exhibited up to 15.8% of this essential fatty acid in the oil. R. grossularia and R. rubrum showed mean gamma-linolenic acid contents of 8% and 6.2%, respectively. The present study indicated that seeds of Ribes species, especially R. nigrum, could be used as sources of gamma-linolenic acid and natural vitamin E.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11170598&dopt=Abstract







Natural Herbal Supplement: Hair Million


Hair loss alone does not pose significant health problems. In fact, there are people who opt for baldness as an alternative hair style. However, in general, however, hair loss is not considered desirable.

The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer a biologically essential part of our body, just like appendix. The hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.

While the hair loss and resulting baldness in general have not been proven to be related to underlying health problems, there are certain correlations between hair loss and health problems. For instance, premature hair loss could suggest premature aging or nutritional and hormonal imbalance, stressful life, use of drugs that cause hair loss as a side effect, skin disease, or heart disease. The balding appearance could also impart a subdued impression of integrity in bodily health and youthfulness.












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