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Fatty acids resources:

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J Clin Endocrinol Metab. 2002 Oct;87(10):4747-53.
Elevated regional lipolysis in hyperthyroidism.

Riis AL, Gravholt CH, Djurhuus CB, Norrelund H, Jorgensen JO, Weeke J, Moller N.

Medical Department M (Endocrinology and Diabetes), Aarhus University Hospital and Institute of Experimental Clinical Science, Aarhus University, Aarhus 8000, Denmark. anne.lene.riiekf.au.dk

Hyperthyroidism is characterized by increased levels of circulating free fatty acids (FFA) and increased lipid oxidation, but it is uncertain which regional fat depots contribute. The present study was designed to define the participation of femoral and abdominal fat stores in the overall stimulation of lipolysis in hyperthyroidism in the basal state and during insulin stimulation. We studied nine women with newly diagnosed hyperthyroidism (HT) and after (euthyroidism, ET) medical treatment with methimazol and compared with eight control subjects (CTR). All subjects were studied in the postabsorptive state and during a 3-h hyperinsulinemic euglycemic clamp with microdialysis catheters sc in the abdominal and femoral adipose tissue. Before treatment, patients had elevated circulating concentrations of triiodthyronine, FFA, and glycerol. Levels of interstitial glycerol ( micro mol/liter) in abdominal adipose tissue [485 +/- 24 (HT), 226 +/- 20 (ET) (P < 0.001), 265 +/- 34 (CTR) (P < 0.001)] and in femoral adipose tissue [468 +/- 41(HT), 245 +/- 29 (ET) (P < 0.01), 278 +/- 31(CTR) (P < 0.005)] were elevated in the basal hyperthyroid state, and these differences prevailed during the glucose clamp [230 +/- 23 (HT), 113 +/- 13 (ET) (P < 0.01), 132 +/- 22(CTR) (P < 0.01) and 303 +/- 39 (HT), 122 +/- 15 (ET) (P < 0.01), 166 +/- 21(CTR) (P < 0.01)]. These results suggest that femoral and abdominal adipose tissue contribute equally to the excessive rate of lipolysis in hyperthyroidism and that both tissues are resistant to the actions of insulin.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12364469&dopt=Abstract

J Lipid Res. 2002 Oct;43(10):1618-29.
Increased atherosclerosis in diabetic dyslipidemic swine: protection by atorvastatin involves decreased VLDL triglycerides but minimal effects on the lipoprotein profile.

Dixon JL, Shen S, Vuchetich JP, Wysocka E, Sun GY, Sturek M.

Dalton Cardiovascular Research Center, University of Missouri, Research Park, Columbia, MO, USA. dixonissouri.edu

Male Yucatan swine were allocated to four groups (n = 5-6 pigs per group): low fat (3%) fed control, high fat/2% cholesterol (CH) fed (HF), high fat/CH fed with alloxan-induced diabetes (DF) and DF pigs that were treated with atorvastatin (80 mg/day; DF+A). Pigs were fed two meals per day and daily insulin injections were used in diabetic pigs to maintain plasma glucose between 250 and 350 mg/dl. Diabetic dyslipidemic (DF) pigs exhibited greater coronary atherosclerosis and increased collagen deposition in internal mammary artery compared with normoglycemic hyperlipidemic pigs. Although total and LDL CH concentrations did not differ, triglyceride (TG) were increased in DF pigs and FPLC analysis indicated that the LDL/HDL CH ratio was significantly increased in DF compared with HF pigs. The LDL fraction of DF pigs contained larger, lipid enriched particles resembling IDL. Consumption of the high fat/CH diet caused a moderate increase in the percentage of 14:0 fatty acids in plasma lipids and this was compensated by small-moderate declines in several unsaturated fatty acids. There was a significant increase in phospholipid arachidonic acid in DF compared with HF pigs. Atorvastatin protected diabetic pigs from atherosclerosis and decreased total and VLDL TG, but exerted minimal effects on the FPLC lipoprotein and plasma fatty acid profiles and plasma concentrations of total and LDL CH, vitamin A, vitamin E, and lysophosphatidylcholine. Across all groups the plasma CH concentration was positively correlated with hepatic CH concentration. These findings suggest that atorvastatin's protection against coronary artery atherosclerosis in diabetes may involve effects on plasma VLDL TG concentration. Lack of major effects on other lipid parameters, including the LDL/HDL ratio, suggests that atorvastatin may have yet other anti-atherogenic effects, possibly directly in the vessel wall.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12364546&dopt=Abstract

J Lipid Res. 2002 Oct;43(10):1630-40.
Nuclear import of factors involved in signaling is inhibited in C3H/10T1/2 cells treated with tetradecylthioacetic acid.

Bjorndal B, Helleland C, Boe SO, Gudbrandsen OA, Kalland KH, Bohov P, Berge RK, Lillehaug JR.

Department of Molecular Biology, University of Bergen, 5020 Bergen, Norway. bodil.bjorndabi.uib.no

The non-beta-oxidisable tetradecylthioacetic acid (TTA) is incorporated into cellular membranes when C3H/10T1/2 cells are cultured in TTA-containing medium. We here demonstrate that this alteration in cellular membranes affect the nuclear translocation of proteins involved in signal transduction. Analysis of cellular fatty acid composition shows that TTA and TTA:1n-8 constitute approximately 40 mol% of total fatty acids in cellular/nuclear membranes. Activation of c-fos expression is significantly inhibited in TTA-treated cells but the enzymatic activation of mitogen activated protein kinase (ERK) is not affected. Immunofluorescence and confocal microscopy studies demonstrate that in mitogene-stimulated TTA-treated cells, the translocation of phosphorylated ERK1/2, protein kinase C alpha (PKC alpha), and PKC beta(1) from the cytoplasm into the nucleus is considerably decreased and delayed. Concomitant with a decreased nuclear import, ERK1/2 dephosphorylation is decreased in TTA-treated cells. There is no TTA-induced inhibition of nuclear import of proteins with a classical nuclear localization signal (NLS), as seen by in vitro nuclear import experiments of BSA fused to the NLS from SV40 large T, or in vivo studies of hnRNP A1 nuclear import. The expression levels of Importin alpha, Importin beta, Importin 7, and NTF2 are not altered in the TTA-treated cells. Taken together, our data indicate that TTA treatment causes changes in cellular fatty acid composition that negatively affect NLS-independent mechanisms of protein translocation through the nuclear pore complex.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12364547&dopt=Abstract

J Lipid Res. 2002 Oct;43(10):1670-9.
A novel soluble analog of the HIV-1 fusion cofactor, globotriaosylceramide (Gb(3)), eliminates the cholesterol requirement for high affinity gp120/Gb(3) interaction.

Mahfoud R, Mylvaganam M, Lingwood CA, Fantini J.

Institut Mediterraneen de Recherche en Nutrition, UMR-INRA 1111, Faculte des Sciences St-Jerome, 13397 Marseille Cedex 20, France.

We have analyzed the interaction of adamantyl Gb(3) (adaGb(3)), a semi-synthetic soluble analog of Gb(3), with HIV-1 surface envelope glycoprotein gp120. In this analog, which was orginally designed to inhibit verotoxin binding to its glycolipid receptor, Gb(3), the fatty acid chain is replaced with a rigid globular hydrocarbon frame (adamantane). Despite its solubility, adaGb(3) forms monolayers at an air-water interface. Compression isotherms of such monolayers demonstrated that the adamantane substitution resulted in a larger minimum molecular area and a more rigid, less compressible film than Gb(3). Insertion of gp120 into adaGb(3) monolayers was exponential whereas the gp120/Gb(3) interaction curve was sigmoidal with a lag phase of 40 min. Adding cholesterol into authentic Gb(3) monolayers abrogated the lag phase and increased the initial rate of interaction with gp120. This effect of cholesterol was not observed with phosphatidylcholine or sphingomyelin. In addition, verotoxin-bound adaGb(3) or Gb(3) plus cholesterol was recovered in fractions of comparable low density after ultracentrifugation through sucrose-density gradients in the presence of Triton X-100. The unique biological and physico-chemical properties of adaGb(3) suggest that this analog may be a potent soluble mimic of Gb(3), providing a novel concept for developing GSL-derived viral fusion inhibitors.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12364551&dopt=Abstract

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