Flaxseed oil influences incorporation of glucose transporters in erythrocyte membranes during experimental diabetes in rats

Planta Medica ◽  
2014 ◽  
Vol 80 (16) ◽  
Author(s):  
J Hussein ◽  
Z El-Khayat ◽  
O Shaker ◽  
DA El-Matty ◽  
W Rasheed ◽  
...  
Keyword(s):  
Experimental Diabetes ◽  
Glucose Transporters ◽  
Flaxseed Oil ◽  
Erythrocyte Membranes

Perinatal consumption of flaxseed oil and flaxseed flour has beneficial effects on cardiac fibrosis of male offspring from rat dams with experimental diabetes

2016 ◽  
Vol 83 ◽  
pp. 162-168 ◽  
Author(s):  
Gabriela Câmara Vicente ◽  
André Manoel Correia-Santos ◽  
Akemi Suzuki ◽  
Juliana Saraiva dos Anjos ◽  
Luis Guillermo Coca Velarde ◽  
...  
Keyword(s):  
Cardiac Fibrosis ◽  
Experimental Diabetes ◽  
Flaxseed Oil ◽  
Male Offspring ◽  
Beneficial Effects ◽  
Flaxseed Flour

scholarly journals Incorporation and Clearance of Omega-3 Fatty Acids in Erythrocyte Membranes and Plasma Phospholipids

2006 ◽  
Vol 52 (12) ◽  
pp. 2265-2272 ◽  
Author(s):  
Jing Cao ◽  
Kerry A Schwichtenberg ◽  
Naomi Q Hanson ◽  
Michael Y Tsai
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Fish Oil ◽  
Erythrocyte Membrane ◽  
Flaxseed Oil ◽  
Erythrocyte Membranes ◽  
Omega 3 Fatty Acids ◽  
Omega 3 ◽  
Fatty Acid Supplementation ◽  
Plasma Phospholipids

Abstract Background: The sum of eicosapentaenoic acid (EPA, 20:5 ω3) and docosahexaenoic acid (DHA, 22:6 ω3) in erythrocyte membranes, termed the omega-3 index, can indicate suboptimal intake of omega-3 fatty acids, a risk factor for cardiovascular disease (CVD). To study the effects of fatty acid supplementation, we investigated the rate of incorporation and clearance of these fatty acids in erythrocyte membranes and plasma after intake of supplements. Methods: Twenty study participants received supplementation with either fish oil (1296 mg EPA + 864 mg DHA/day) or flaxseed oil (3510 mg alpha-linolenic acid + 900 mg linoleic acid/day) for 8 weeks. We obtained erythrocyte membrane and plasma samples at weeks 0, 4, 8, 10, 12, 14, 16, and 24 and extracted and analyzed fatty acids by gas chromatography. Results: After 8 weeks of fish oil supplementation, erythrocyte membrane EPA and DHA increased 300% (P <0.001) and 42% (P <0.001), respectively. The mean erythrocyte omega-3 index reached a near optimal value of 7.8%, and remained relatively high until week 12. EPA and DHA showed greater increases and more rapid washout period decreases in plasma phospholipids than in erythrocyte membranes. Flaxseed oil supplementation increased erythrocyte membrane EPA to 133% (P <0.05) and docosapentaenoic acid (DPA, 22:5 ω3) to 120% (P <0.01) of baseline, but DHA was unchanged. In plasma phospholipids, EPA, DPA, and DHA showed a slight but statistically insignificant increase. Conclusions: Erythrocyte membrane EPA+DHA increases during relatively short intervals in response to supplementation at rates related to amount of supplementation. These results may be useful to establish appropriate dosage for omega-3 fatty acid supplementation.

Exofacial regions of the glucose transporter of human erythrocytes: detection with polyclonal antibodies

1988 ◽  
Vol 66 (10) ◽  
pp. 1126-1133 ◽  
Author(s):  
Elena Burdett ◽  
Amira Klip
Keyword(s):  
Metabolic Regulation ◽  
Glucose Transporter ◽  
Polyclonal Antibodies ◽  
Protein A ◽  
Glucose Transporters ◽  
Human Erythrocytes ◽  
Erythrocyte Membranes ◽  
Western Blots ◽  
Intact Cells ◽  
Human Erythrocyte Membranes

The glucose transporter of human erythrocytes is a glycoprotein of 492 amino acids with a Mr of 55 000. From hydrophobicity plots based on the transporter's amino acid sequence, it has been proposed that exofacially, there are only a segment of 34 residues and the glycosylating carbohydrate branch. To detect changes in the number of glucose transporters during metabolic regulation in intact cells, one should obtain antibodies directed to exofacial sites of the transporter. Antibodies to the purified glucose transporter (Band 4.5), intact or deglycosylated with endoglycosidase F, were raised in rabbits. These antibodies, when purified by column chromatography on protein A-Sepharose and by adsorption onto erythrocyte membranes, cross-reacted with the glycosylated glucose transporter on Western blots. The reactivity of the polyclonal antibodies with intact cells was tested by incubating these cells with the antibody, followed by a centrifugation and a subsequent reaction with 125I-labelled goat-antirabbit immunoglobulin G. Intact human erythrocytes reacted positively with the anti-Band 4.5 antibodies but not with nonimmune sera. Reaction with human erythrocytes was about 10 times greater than with pig erythrocytes, which lack glucose transporters. The reaction with intact cells was not due to contamination with broken cells since under the conditions used, broken (freeze–thawed) cells or membranes did not sediment. Reaction with human erythrocyte membranes was more than fivefold higher than with pig erythrocyte membranes. Rat L6 muscle cells reacted with anti-Band 4.5 antibodies; there were about 10 times more binding sites in any one cell in L6 cells than in human erythrocytes, roughly paralleling their relative content of glucose transporters. It is concluded that the antibody may be reacting with exofacial regions of the glucose transporter in intact cells. This suggests that the antibodies may be used to detect relative changes in glucose transporter number on the cell surface.

scholarly journals The human erythrocyte nucleoside and glucose transporters are both band 4.5 membrane polypeptides

1983 ◽  
Vol 214 (3) ◽  
pp. 995-997 ◽  
Author(s):  
J S R Wu ◽  
S M Jarvis ◽  
J D Young
Keyword(s):  
Human Erythrocyte ◽  
Glucose Transporters ◽  
Erythrocyte Membranes ◽  
Nucleoside Transporter ◽  
Hexose Transport ◽  
Major Site ◽  
Equilibrium Binding ◽  
Human Erythrocyte Membranes

Human erythrocyte membranes and partially purified nucleoside transporter (band 4.5 and 7) were photoaffinity labelled with 3H-labelled 6-[(4-nitrobenzyl)thio]-9-beta-D-ribofuranosylpurine under equilibrium binding conditions. Band 4.5 was the major site of radiolabelling in both preparations. These experiments provide additional evidence to implicate band 4.5 polypeptides in nucleoside permeation, proteins previously shown to be involved in hexose transport.

scholarly journals Erythrocyte nucleoside and sugar transport Endo-β-galactosidase and endoglycosidase-F digestion of partially purified human and pig transporter proteins

1986 ◽  
Vol 240 (2) ◽  
pp. 349-356 ◽  
Author(s):  
F Y Kwong ◽  
S A Baldwin ◽  
P R Scudder ◽  
S M Jarvis ◽  
M Y Choy ◽  
...  
Keyword(s):  
Human Erythrocyte ◽  
Cytochalasin B ◽  
Sugar Transport ◽  
Glucose Transporters ◽  
Nucleoside Transporters ◽  
Enzyme Treatment ◽  
Erythrocyte Membranes ◽  
Nucleoside Transporter ◽  
Human Erythrocyte Membranes ◽  
Beta Galactosidase

Nucleoside- and glucose-transport proteins isolated from human erythrocyte membranes were photoaffinity-labelled with [3H]nitrobenzylthioinosine and [3H]cytochalasin B, respectively, and subjected to endo-beta-galactosidase or endoglycosidase-F digestion. Without enzyme treatment the two radiolabelled transporters migrated on SDS/polyacrylamide gels with the same apparent Mr (average) of 55,000. Apparent Mr (average) values after endo-beta-galactosidase digestion were 47,000 and 48,000 for the nucleoside and glucose transporters respectively, and 44,000 and 45,000 respectively after endoglycosidase-F digestion. In contrast, endo-beta-galactosidase had no effect on the electrophoretic mobility of the nucleoside transporter isolated from pig erythrocytes. This transport system exhibited a higher Mr than the human protein, endoglycosidase-F treatment decreasing its apparent Mr (average) from 64,000 to 57,000. It is concluded that the human and pig erythrocyte nucleoside transporters are glycoproteins containing N-linked oligosaccharide. The data provide evidence of substantial carbohydrate and polypeptide differences between the human and pig erythrocyte nucleoside transporters, but evidence of molecular similarities between the human erythrocyte nucleoside and glucose transporters.

scholarly journals Maternal use of flaxseed oil during pregnancy and lactation prevents morphological alterations in pancreas of female offspring from rat dams with experimental diabetes

2015 ◽  
Vol 96 (2) ◽  
pp. 94-102 ◽  
Author(s):  
André Manoel Correia-Santos ◽  
Gabriela C. Vicente ◽  
Akemi Suzuki ◽  
Aline D. Pereira ◽  
Juliana S. dos Anjos ◽  
...  
Keyword(s):  
Experimental Diabetes ◽  
Female Offspring ◽  
Flaxseed Oil ◽  
Morphological Alterations ◽  
Pregnancy And Lactation

Effect of Integral Proteins on Frozen Membrane Fracture

1980 ◽  
Vol 38 ◽  
pp. 756-759 ◽  
Author(s):  
S. Kirchanski ◽  
D. Branton
Keyword(s):  
Lipid Bilayers ◽  
Freeze Fracture ◽  
Covalent Bond ◽  
Erythrocyte Membranes ◽  
Glycophorin A ◽  
Experimental Protocol ◽  
Transmembrane Glycoprotein ◽  
Bond Breakage ◽  
Human Erythrocyte Membranes ◽  
Integral Proteins

We have investigated the effect of integral membrane proteins upon the fracturing of frozen lipid bilayers. This investigation has been part of an effort to develop freeze fracture labeling techniques and to assess the possible breakage of covalent protein bonds during the freeze fracture process. We have developed an experimental protocol utilizing lectin affinity columns which should detect small amounts of covalent bond breakage during the fracture of liposomes containing purified (1) glycophorin (a transmembrane glycoprotein of human erythrocyte membranes). To fracture liposomes in bulk, frozen liposomes are ground repeatedly under liquid nitrogen. Failure to detect any significant covalent bond breakage (contrary to (2)) led us to question the effectiveness of our grinding procedure in fracturing and splitting lipid bilayers.

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