title: Cardiac myocyte-specific excision of the beta1 integrin gene results in myocardial fibrosis and cardiac failure.
abstract: Integrins link the extracellular matrix to the cellular cytoskeleton and serve important roles in cell growth, differentiation, migration, and survival. Ablation of beta1 integrin in all murine tissues results in peri-implantation embryonic lethality. To investigate the role of beta1 integrin in the myocardium, we used Cre-LoxP technology to inactivate the beta1 integrin gene exclusively in ventricular cardiac myocytes. Animals with homozygous ventricular myocyte beta1 integrin gene excision were born in appropriate numbers and grew into adulthood. These animals had 18% of control levels of beta1D integrin protein in the heart and displayed myocardial fibrosis. High-fidelity micromanometer-tipped catheterization of the intact 5-week-old beta1 integrin knockout mice showed depressed left ventricular basal and dobutamine-stimulated contractility and relaxation (LV dP/dt(max) and LV dP/dt(min)) as compared with control groups (n=8 to 10 of each, P<0.01). Hemodynamic loading imposed by 7 days of transverse aortic constriction showed that the beta1 integrin knockout mice were intolerant of this stress as they had 53% survival versus 88% in controls (n=15 each). By 6 months of age, mice with depressed ventricular expression of beta1 integrin developed a dilated cardiomyopathy that was not evident in any control animals and had patchy decrease in glucose metabolism as determined by positron emission tomography. Myocyte membrane integrity as determined via Evan's blue dye staining was disrupted in the beta1 integrin knockout mice. This model provides strong evidence for the importance of beta1 integrin in cardiac form and function and indicates that integrins can be linked to development of cardiomyopathies.
authors.affiliation: Department of Physiology, University of California-Los Angeles 90095, USA.
authors.forename: Shaw-Yung
authors.initials: SY
authors.lastname: Shai
authors.forename: Alice E
authors.initials: AE
authors.lastname: Harpf
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Babbitt
authors.forename: Maria C
authors.initials: MC
authors.lastname: Jordan
authors.forename: Michael C
authors.initials: MC
authors.lastname: Fishbein
authors.forename: Ju
authors.initials: J
authors.lastname: Chen
authors.forename: Michelle
authors.initials: M
authors.lastname: Omura
authors.forename: Tarek A
authors.initials: TA
authors.lastname: Leil
authors.forename: K David
authors.initials: KD
authors.lastname: Becker
authors.forename: Meisheng
authors.initials: M
authors.lastname: Jiang
authors.forename: Desmond J
authors.initials: DJ
authors.lastname: Smith
authors.forename: Simon R
authors.initials: SR
authors.lastname: Cherry
authors.forename: Joseph C
authors.initials: JC
authors.lastname: Loftus
authors.forename: Robert S
authors.initials: RS
authors.lastname: Ross
mesh_terms: D000818:Animals; D002311:Cardiomyopathy, Dilated / Q000150:complications / Q000235:genetics / Q000473:pathology; D002462:Cell Membrane / Q000378:metabolism / Q000473:pathology; D002463:Cell Membrane Permeability; D018450:Disease Progression; D005355:Fibrosis / Q000150:complications / Q000235:genetics* / Q000473:pathology; D018390:Gene Targeting; D005947:Glucose / Q000378:metabolism; D006333:Heart Failure / Q000150:complications / Q000235:genetics* / Q000473:pathology; D006352:Heart Ventricles / Q000473:pathology; D006720:Homozygote; D019426:Integrases; D019012:Integrin beta1 / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D009206:Myocardium / Q000378:metabolism* / Q000473:pathology / Q000648:ultrastructure; D009928:Organ Specificity; D016608:Talin / Q000378:metabolism; D014764:Viral Proteins
chemical_list: D019012:Integrin beta1; D016608:Talin; D014764:Viral Proteins; C045073:Cre recombinase; D019426:Integrases; D005947:Glucose