Skip to main content
Top
Published in: Acta Diabetologica 1/2010

01-12-2010 | Original Article

Analysis of the membrane fluidity of erythrocyte ghosts in diabetic, spontaneously hypertensive rats

Authors: Ismael H. Pérez-Hernández, Yesica S. Avendaño-Flores, Ricardo Mejía-Zepeda

Published in: Acta Diabetologica | Special Issue 1/2010

Login to get access

Abstract

Diabetes and hypertension are closely related diseases associated with changes in membrane fluidity. Here, we measured the membrane fluidity of erythrocyte ghosts from spontaneously hypertensive rats (SHR), with or without streptozotocin (STZ)-induced diabetes, at the ages of 1, 3 and 6 months, by introducing the use of the intramolecular excimer forming dipyrenylpropane (DPyP) in this model. Type 2 diabetes mellitus (T2DM) was induced in 48-h-old, newborn male SHR by intraperitoneal injection of STZ. We found lower excimer to monomer (I e/I m) DPyP ratios in diabetic SHR than in control SHR at 3 and 6 months old, indicating a decrease in membrane fluidity. Simultaneously, the composition of fatty acids was determined and it was found that the unsaturated to saturated fatty acids ratio (U/S) was compatible with changes in membrane fluidity. These results suggest that the change in fatty acid composition of erythrocyte ghosts contributes significantly to the decreased membrane fluidity detected with DPyP in diabetic SHR.
Literature
1.
go back to reference Bianchi C, Miccoli R, Penno G, Del Prato S (2008) Primary prevention of cardiovascular disease in people with dysglycemia. Diabetes Care 31:S208–S214CrossRefPubMed Bianchi C, Miccoli R, Penno G, Del Prato S (2008) Primary prevention of cardiovascular disease in people with dysglycemia. Diabetes Care 31:S208–S214CrossRefPubMed
2.
go back to reference Rull JA, Aguilar-Salinas CA, Rojas R, Rios-Torres JM, Gómez-Pérez FJ, Olaiz G (2005) Epidemiology of type 2 diabetes in Mexico. Arch Med Res 36:188–196CrossRefPubMed Rull JA, Aguilar-Salinas CA, Rojas R, Rios-Torres JM, Gómez-Pérez FJ, Olaiz G (2005) Epidemiology of type 2 diabetes in Mexico. Arch Med Res 36:188–196CrossRefPubMed
3.
go back to reference Powers AC (2005) Diabetes mellitus. In: Kasper DL, Braunwald E, Fauci AS, Hauser S, Longo DL, Jameson JL (eds) Harrison′s principles of internal medicine. McGraw Hill, New York, pp 2152–2180 Powers AC (2005) Diabetes mellitus. In: Kasper DL, Braunwald E, Fauci AS, Hauser S, Longo DL, Jameson JL (eds) Harrison′s principles of internal medicine. McGraw Hill, New York, pp 2152–2180
4.
go back to reference Fisher NDL, Williams GH (2005) Hypertensive vascular disease. In: Kasper DL, Braunwald E, Fauci AS, Hauser S, Longo DL, Jameson JL (eds) Harrison′s principles of internal medicine. McGraw Hill, New York, pp 1463–1481 Fisher NDL, Williams GH (2005) Hypertensive vascular disease. In: Kasper DL, Braunwald E, Fauci AS, Hauser S, Longo DL, Jameson JL (eds) Harrison′s principles of internal medicine. McGraw Hill, New York, pp 1463–1481
5.
go back to reference Ntambi JM (1999) Regulation of stearoyl-CoA desaturase by polyunsaturated fatty acids and cholesterol. J Lipid Res 40:1549–1558PubMed Ntambi JM (1999) Regulation of stearoyl-CoA desaturase by polyunsaturated fatty acids and cholesterol. J Lipid Res 40:1549–1558PubMed
6.
go back to reference Pezeshk A, Dalhouse AD (2000) Vitamin E, membrane fluidity, and blood pressure in hypertensive and normotensive rats. Life Sci 67:1881–1889CrossRefPubMed Pezeshk A, Dalhouse AD (2000) Vitamin E, membrane fluidity, and blood pressure in hypertensive and normotensive rats. Life Sci 67:1881–1889CrossRefPubMed
7.
go back to reference Tsuda K, Iwahashi H, Minatogawa Y, Nishio I, Kido R, Masuyama Y (1987) Electron spin resonance studies of erythrocytes from spontaneously hypertensive rats and humans with essential hypertension. Hypertension 9:19–24 Tsuda K, Iwahashi H, Minatogawa Y, Nishio I, Kido R, Masuyama Y (1987) Electron spin resonance studies of erythrocytes from spontaneously hypertensive rats and humans with essential hypertension. Hypertension 9:19–24
8.
go back to reference Waczulíková I, Sikurová L, Cársky J, Strbová L, Krahulec B (2000) Decreased fluidity of isolated erythrocytes membranes in type 1 and type 2 diabetes. The effect of resocylidene aminoguanidine. Gen Physiol Biophys 19:381–392PubMed Waczulíková I, Sikurová L, Cársky J, Strbová L, Krahulec B (2000) Decreased fluidity of isolated erythrocytes membranes in type 1 and type 2 diabetes. The effect of resocylidene aminoguanidine. Gen Physiol Biophys 19:381–392PubMed
9.
go back to reference Waczulíková I, Sikurová L, Cársky J (2002) Fluidity gradient of erythrocyte membranes in diabetics: the effect of resorcylidene aminoguanidine. Bioelectrochemistry 55:53–55CrossRefPubMed Waczulíková I, Sikurová L, Cársky J (2002) Fluidity gradient of erythrocyte membranes in diabetics: the effect of resorcylidene aminoguanidine. Bioelectrochemistry 55:53–55CrossRefPubMed
10.
go back to reference Sargento L, Zabala L, Saldanha C, Souza-Ramalho P, Martins e Silva J (1998) The effect of sodium fluorescein angiography on erythrocyte properties. Clin Hemorheol Microcirc 18:135–139PubMed Sargento L, Zabala L, Saldanha C, Souza-Ramalho P, Martins e Silva J (1998) The effect of sodium fluorescein angiography on erythrocyte properties. Clin Hemorheol Microcirc 18:135–139PubMed
11.
go back to reference Moretti N, Rabini RA, Nanetti L, Grechi G, Curzi MC, Cester N, Tranquilli LA, Mazzanti L (2002) Sialic acid content in erythrocyte membranes from pregnant women affected by gestational diabetes. Metabolism 51:605–608CrossRefPubMed Moretti N, Rabini RA, Nanetti L, Grechi G, Curzi MC, Cester N, Tranquilli LA, Mazzanti L (2002) Sialic acid content in erythrocyte membranes from pregnant women affected by gestational diabetes. Metabolism 51:605–608CrossRefPubMed
12.
go back to reference Nanetti L, Vignini A, Raffaelli F, Moroni C, Silvestrini M, Provinciali L, Mazzanti L (2008) Platelet membrane fluidity and Na+/K+ ATPase activity in acute stroke. Brain Res 1205:21–26CrossRefPubMed Nanetti L, Vignini A, Raffaelli F, Moroni C, Silvestrini M, Provinciali L, Mazzanti L (2008) Platelet membrane fluidity and Na+/K+ ATPase activity in acute stroke. Brain Res 1205:21–26CrossRefPubMed
13.
go back to reference Tsuda K (2008) Electron paramagnetic resonance investigation on modulatory effect of benidipine on membrane fluidity of erythrocytes in essential hypertension. Heart Vessels 23:134–139CrossRefPubMed Tsuda K (2008) Electron paramagnetic resonance investigation on modulatory effect of benidipine on membrane fluidity of erythrocytes in essential hypertension. Heart Vessels 23:134–139CrossRefPubMed
14.
go back to reference Muller S, Denet S, Candiloros H, Barrois R, Wiernsperger N, Donner M, Drouin P (1997) Action of metformin on erythrocyte membrane fluidity in vitro and in vivo. Eur J Pharmacol 337:103–110CrossRefPubMed Muller S, Denet S, Candiloros H, Barrois R, Wiernsperger N, Donner M, Drouin P (1997) Action of metformin on erythrocyte membrane fluidity in vitro and in vivo. Eur J Pharmacol 337:103–110CrossRefPubMed
15.
go back to reference Delachambre MC, Narce M, Asdrubal P, Poisson JP (1998) Changes in tissue polyunsaturated fatty acids with age, in spontaneously hypertensive rats. Lipids 33:795–801CrossRefPubMed Delachambre MC, Narce M, Asdrubal P, Poisson JP (1998) Changes in tissue polyunsaturated fatty acids with age, in spontaneously hypertensive rats. Lipids 33:795–801CrossRefPubMed
16.
go back to reference Chi Y, Gupta RK (1998) Alterations in heart and kidney membrane phospholipids in hypertension as observed by 31P nuclear magnetic resonance. Lipids 33:1023–1030CrossRefPubMed Chi Y, Gupta RK (1998) Alterations in heart and kidney membrane phospholipids in hypertension as observed by 31P nuclear magnetic resonance. Lipids 33:1023–1030CrossRefPubMed
17.
go back to reference Taylor AJ, Jennings PE, Barnett AH, Pandov HI, Lawson N (1987) An alternative explanation for the changes in erythrocyte fatty acids observed in diabetes mellitus. Clin Chem 33:2083–2085PubMed Taylor AJ, Jennings PE, Barnett AH, Pandov HI, Lawson N (1987) An alternative explanation for the changes in erythrocyte fatty acids observed in diabetes mellitus. Clin Chem 33:2083–2085PubMed
18.
go back to reference Bakan E, Yildirim A, Kurtul N, Polat MF, Dursun H, Cayir K (2006) Effects of type 2 diabetes mellitus on plasma fatty acid composition and cholesterol content of erythrocyte and leukocyte membranes. Acta Diabetol 43:109–113CrossRefPubMed Bakan E, Yildirim A, Kurtul N, Polat MF, Dursun H, Cayir K (2006) Effects of type 2 diabetes mellitus on plasma fatty acid composition and cholesterol content of erythrocyte and leukocyte membranes. Acta Diabetol 43:109–113CrossRefPubMed
19.
go back to reference Owen JS, Bruckdorfer KR, Day RC, McIntyre N (1982) Decreased erythrocyte membrane fluidity and altered lipid composition in human liver disease. J Lipid Res 23:124–132PubMed Owen JS, Bruckdorfer KR, Day RC, McIntyre N (1982) Decreased erythrocyte membrane fluidity and altered lipid composition in human liver disease. J Lipid Res 23:124–132PubMed
20.
go back to reference Quinn P, Tessier C, Dominique R, Koumanov K, Wolf C (2005) Structure and thermotropic phase behaviour of detergent-resistent membrane raft fractions isolated from human and ruminant erythrocytes. Biochim Biophys Acta 1713:5–14CrossRefPubMed Quinn P, Tessier C, Dominique R, Koumanov K, Wolf C (2005) Structure and thermotropic phase behaviour of detergent-resistent membrane raft fractions isolated from human and ruminant erythrocytes. Biochim Biophys Acta 1713:5–14CrossRefPubMed
21.
go back to reference Bradford M (1976) A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Anal Biochem 72:248–254CrossRefPubMed Bradford M (1976) A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Anal Biochem 72:248–254CrossRefPubMed
22.
go back to reference Shacterle G, Pollack R (1973) A simplified method for the quantitative assay of small amounts of protein in biological material. Anal Biochem 51:654–655CrossRef Shacterle G, Pollack R (1973) A simplified method for the quantitative assay of small amounts of protein in biological material. Anal Biochem 51:654–655CrossRef
23.
go back to reference Pugsley A, Shnaitman C (1978) Identification of three genes controlling production of new outer membrane pore proteins in Escherichia coli K-12. J Bacteriol 135:1118–1129PubMed Pugsley A, Shnaitman C (1978) Identification of three genes controlling production of new outer membrane pore proteins in Escherichia coli K-12. J Bacteriol 135:1118–1129PubMed
24.
go back to reference Barttlet G (1959) Phosphorus assay in column chromatography. J. Biol Chem 234:466–468 Barttlet G (1959) Phosphorus assay in column chromatography. J. Biol Chem 234:466–468
25.
go back to reference Mejía R, Gómez-Eichelmann MC, Fernández MS (1999) Escherichia coli membrane fluidity as detected by excimerization of dipyrenylpropane: sensitivity to the bacterial fatty acid profile. Arch Biochem Biophys 368:156–160CrossRefPubMed Mejía R, Gómez-Eichelmann MC, Fernández MS (1999) Escherichia coli membrane fluidity as detected by excimerization of dipyrenylpropane: sensitivity to the bacterial fatty acid profile. Arch Biochem Biophys 368:156–160CrossRefPubMed
26.
go back to reference Bligh E, Dyer W (1959) A rapid method of total lipid extraction and purification. Can J Biochem Phys 37:911–917CrossRef Bligh E, Dyer W (1959) A rapid method of total lipid extraction and purification. Can J Biochem Phys 37:911–917CrossRef
27.
go back to reference Ames GF (1968) Lipids of Salmonella typhimurium and Escherichia coli: structure and metabolism. J Bacteriol 95:833–843PubMed Ames GF (1968) Lipids of Salmonella typhimurium and Escherichia coli: structure and metabolism. J Bacteriol 95:833–843PubMed
28.
go back to reference Morrison WR, Smith LM (1964) Preparation of fatty acid methyl esters and dimethylacetals from lipids with boron fluoride-methanol. J Lipid Res 5:600–608PubMed Morrison WR, Smith LM (1964) Preparation of fatty acid methyl esters and dimethylacetals from lipids with boron fluoride-methanol. J Lipid Res 5:600–608PubMed
29.
go back to reference Iwase M (1991) A new animal model of non-insulin-dependent diabetes mellitus with hypertension: neonatal streptozotocin treatment in spontaneously hypertensive rats. Fukuoka Igaku Zasshi 82:415–427PubMed Iwase M (1991) A new animal model of non-insulin-dependent diabetes mellitus with hypertension: neonatal streptozotocin treatment in spontaneously hypertensive rats. Fukuoka Igaku Zasshi 82:415–427PubMed
30.
go back to reference Zhang F, Ye C, Li G, Ding W, Zhou W, Zhu H, Chen G, Luo T, Guang M, Liu Y, Zhang D, Zheng S, Yang J, Gu Y, Xie X, Luo M (2003) The rat model of type 2 diabetic mellitus and its glycometabolism characters. Exp Anim 52:401–407CrossRefPubMed Zhang F, Ye C, Li G, Ding W, Zhou W, Zhu H, Chen G, Luo T, Guang M, Liu Y, Zhang D, Zheng S, Yang J, Gu Y, Xie X, Luo M (2003) The rat model of type 2 diabetic mellitus and its glycometabolism characters. Exp Anim 52:401–407CrossRefPubMed
31.
go back to reference Mejía R, Gómez-Eichelmann MC, Fernández MS (1995) Membrane fluidity of Escherichia coli during heat-shock. Biochim Biophys Acta 1239:195–200CrossRefPubMed Mejía R, Gómez-Eichelmann MC, Fernández MS (1995) Membrane fluidity of Escherichia coli during heat-shock. Biochim Biophys Acta 1239:195–200CrossRefPubMed
32.
go back to reference Almeida LM, Vaz WL, Zachariasse KA, Madeira VM (1982) Fluidity of sarcoplasmic reticulum membranes investigated with dipyrenylpropane, an intramolecular excimer probe. Biochemistry 21:5972–5977CrossRefPubMed Almeida LM, Vaz WL, Zachariasse KA, Madeira VM (1982) Fluidity of sarcoplasmic reticulum membranes investigated with dipyrenylpropane, an intramolecular excimer probe. Biochemistry 21:5972–5977CrossRefPubMed
33.
go back to reference Melnick RL, Haspel HC, Goldenberg M, Greenbaum LM, Weinstein S (1981) Use of fluorescent probes that form intramolecular excimers to monitor structural changes in model and biological membranes. Biophys J 34:499–515CrossRefPubMed Melnick RL, Haspel HC, Goldenberg M, Greenbaum LM, Weinstein S (1981) Use of fluorescent probes that form intramolecular excimers to monitor structural changes in model and biological membranes. Biophys J 34:499–515CrossRefPubMed
34.
go back to reference Jurado AS, Almeida LM, Madeira VM (1991) Fluidity of bacterial membrane lipids monitored by intramolecular excimerization of 1.3-di(2-pyrenyl)propane. Biochem Biophys Res Commun 176:356–363CrossRefPubMed Jurado AS, Almeida LM, Madeira VM (1991) Fluidity of bacterial membrane lipids monitored by intramolecular excimerization of 1.3-di(2-pyrenyl)propane. Biochem Biophys Res Commun 176:356–363CrossRefPubMed
35.
go back to reference Cassera MB, Silber AM, Gennaro AM (2002) Differential effects of cholesterol on acyl chain order in erythrocyte membranes as a function of depth from the surface. An electron paramagnetic resonance (EPR) spin label study. Biophys Chem 99:117–127PubMed Cassera MB, Silber AM, Gennaro AM (2002) Differential effects of cholesterol on acyl chain order in erythrocyte membranes as a function of depth from the surface. An electron paramagnetic resonance (EPR) spin label study. Biophys Chem 99:117–127PubMed
36.
go back to reference Salzer U, Prohaska R (2001) Stomatin, flotillin-1, and flotillin-2 are major integral proteins of erythrocyte lipid rafts. Blood 97:1141–1143CrossRefPubMed Salzer U, Prohaska R (2001) Stomatin, flotillin-1, and flotillin-2 are major integral proteins of erythrocyte lipid rafts. Blood 97:1141–1143CrossRefPubMed
37.
go back to reference Callera GE, Montezano AC, Yogi A, Tostes RC, Touyz RM (2007) Vascular signaling through cholesterol-rich domains: implications in hypertension. Curr Opin Nephrol Hypertens 16:90–104CrossRefPubMed Callera GE, Montezano AC, Yogi A, Tostes RC, Touyz RM (2007) Vascular signaling through cholesterol-rich domains: implications in hypertension. Curr Opin Nephrol Hypertens 16:90–104CrossRefPubMed
38.
39.
go back to reference Rodrigo R, Bächler JP, Araya J, Prat H, Passalacqua W (2007) Relationship between (Na + K)-ATPase activity, lipid peroxidation and fatty acid profile in erythrocytes of hypertensive and normotensive subjects. Mol Cell Biochem 303:73–81CrossRefPubMed Rodrigo R, Bächler JP, Araya J, Prat H, Passalacqua W (2007) Relationship between (Na + K)-ATPase activity, lipid peroxidation and fatty acid profile in erythrocytes of hypertensive and normotensive subjects. Mol Cell Biochem 303:73–81CrossRefPubMed
40.
go back to reference Comte C, Bellenger S, Bellenger J, Tessier C, Poisson JP, Narce M (2004) Effects of streptozotocin and dietary fructose on delta-6 desaturation in spontaneously hypertensive rat liver. Biochimie 86:799–806CrossRefPubMed Comte C, Bellenger S, Bellenger J, Tessier C, Poisson JP, Narce M (2004) Effects of streptozotocin and dietary fructose on delta-6 desaturation in spontaneously hypertensive rat liver. Biochimie 86:799–806CrossRefPubMed
41.
42.
go back to reference McLaren Y, Kreutz R, Lindpaintner K, Bohr DF, Ganten D, Reid JL, Dominiczak AF (1993) Membrane microviscosity does not correlate with blood pressure: a cosegregation study. J Hypertens 11:25–30CrossRefPubMed McLaren Y, Kreutz R, Lindpaintner K, Bohr DF, Ganten D, Reid JL, Dominiczak AF (1993) Membrane microviscosity does not correlate with blood pressure: a cosegregation study. J Hypertens 11:25–30CrossRefPubMed
43.
go back to reference Borochov H, Shinitzky M, Barenholz Y (1979) Sphingomyelin phase transition in the sheep erythrocyte membrane. Cell Biophys 1:219–228CrossRefPubMed Borochov H, Shinitzky M, Barenholz Y (1979) Sphingomyelin phase transition in the sheep erythrocyte membrane. Cell Biophys 1:219–228CrossRefPubMed
44.
go back to reference Okamoto H, Kawaguchi H, Minami M, Saito H, Yasuda H (1989) Lipid alterations in renal membrane of stroke-prone spontaneously hypertensive rats. Hypertension 13:456–462PubMed Okamoto H, Kawaguchi H, Minami M, Saito H, Yasuda H (1989) Lipid alterations in renal membrane of stroke-prone spontaneously hypertensive rats. Hypertension 13:456–462PubMed
45.
go back to reference Dorrance AM, Graham D, Webb RC, Fraser R, Dominiczak A (2001) Increased membrane sphingomyelin and arachidonic acid in stroke-prone spontaneously hypertensive rats. Am J Hypertens 14:1149–1153CrossRefPubMed Dorrance AM, Graham D, Webb RC, Fraser R, Dominiczak A (2001) Increased membrane sphingomyelin and arachidonic acid in stroke-prone spontaneously hypertensive rats. Am J Hypertens 14:1149–1153CrossRefPubMed
46.
go back to reference Labrouche S, Freyburger G, Gin H, Boisseau MR, Cassagne C (1996) Changes in phospholipids composition of blood cell membranes (erythrocyte, platelet, and polymorphonuclear) in different types of diabetes: clinical and biological correlations. Metabolism 45:57–62CrossRefPubMed Labrouche S, Freyburger G, Gin H, Boisseau MR, Cassagne C (1996) Changes in phospholipids composition of blood cell membranes (erythrocyte, platelet, and polymorphonuclear) in different types of diabetes: clinical and biological correlations. Metabolism 45:57–62CrossRefPubMed
47.
go back to reference Górska M, Dobrzyn A, Zendzian-Piotrowska M, Górski J (2004) Effect of streptozotocin-diabetes on the functioning of the sphingomyelin-signalling pathway in skeletal muscles of the rat. Horm Metab Res 36:14–21CrossRefPubMed Górska M, Dobrzyn A, Zendzian-Piotrowska M, Górski J (2004) Effect of streptozotocin-diabetes on the functioning of the sphingomyelin-signalling pathway in skeletal muscles of the rat. Horm Metab Res 36:14–21CrossRefPubMed
48.
go back to reference Cazzola R, Rondanelli M, Russo-Volpe S, Ferrari E, Cestaro B (2004) Decreased membrane fluidity and altered susceptibility to peroxidation and lipid composition in overweight and obese female erythrocytes. J Lipid Res 45:1846–1851CrossRefPubMed Cazzola R, Rondanelli M, Russo-Volpe S, Ferrari E, Cestaro B (2004) Decreased membrane fluidity and altered susceptibility to peroxidation and lipid composition in overweight and obese female erythrocytes. J Lipid Res 45:1846–1851CrossRefPubMed
49.
go back to reference Jiang M, Jia L, Jiang W, Hu X, Zhou H, Gao X, Lu Z, Zhang Z (2003) Protein disregulation in red blood cell membranes of type 2 diabetic patients. Biochem Biophys Res Commun 309:196–200CrossRefPubMed Jiang M, Jia L, Jiang W, Hu X, Zhou H, Gao X, Lu Z, Zhang Z (2003) Protein disregulation in red blood cell membranes of type 2 diabetic patients. Biochem Biophys Res Commun 309:196–200CrossRefPubMed
Metadata
Title
Analysis of the membrane fluidity of erythrocyte ghosts in diabetic, spontaneously hypertensive rats
Authors
Ismael H. Pérez-Hernández
Yesica S. Avendaño-Flores
Ricardo Mejía-Zepeda
Publication date
01-12-2010
Publisher
Springer Milan
Published in
Acta Diabetologica / Issue Special Issue 1/2010
Print ISSN: 0940-5429
Electronic ISSN: 1432-5233
DOI
https://doi.org/10.1007/s00592-009-0120-9

Other articles of this Special Issue 1/2010

Acta Diabetologica 1/2010 Go to the issue
Obesity Clinical Trial Summary

At a glance: The STEP trials

A round-up of the STEP phase 3 clinical trials evaluating semaglutide for weight loss in people with overweight or obesity.

Developed by: Springer Medicine

Highlights from the ACC 2024 Congress

Year in Review: Pediatric cardiology

Watch Dr. Anne Marie Valente present the last year's highlights in pediatric and congenital heart disease in the official ACC.24 Year in Review session.

Year in Review: Pulmonary vascular disease

The last year's highlights in pulmonary vascular disease are presented by Dr. Jane Leopold in this official video from ACC.24.

Year in Review: Valvular heart disease

Watch Prof. William Zoghbi present the last year's highlights in valvular heart disease from the official ACC.24 Year in Review session.

Year in Review: Heart failure and cardiomyopathies

Watch this official video from ACC.24. Dr. Biykem Bozkurt discuss last year's major advances in heart failure and cardiomyopathies.