Circulation Research. 2001;89:453-460
Published online before print August 16, 2001, doi: 10.1161/hh1701.096615
Published online before print August 16, 2001, doi: 10.1161/hh1701.096615
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© 2001 American Heart Association, Inc.
Cellular Biology |
Reactive Oxygen Species Mediate Amplitude-Dependent Hypertrophic and Apoptotic Responses to Mechanical Stretch in Cardiac Myocytes
From the Cardiovascular Section (D.R.P., J.K.A., L.X., T.M., J.O.-K., R.B., J.W., D.A.S., W.S.C., D.B.S.), Department of Medicine, Boston University Medical Center; The Myocardial Biology Unit (D.R.P., J.K.A., L.X., T.M., R.B., J.W., D.A.S., W.S.C., D.B.S.), Boston University School of Medicine; the Department of Biophysics (J.V.), Boston University Medical Center; and the Boston Veterans Administration Medical Center (K.S.), Boston, Mass. Current affiliation for P.P. is Henry Ford Hospital, Detroit, Mich.
Correspondence to Douglas B. Sawyer, MD, PhD, Cardiovascular Section, Boston University Medical Center, 88 E Newton St, Boston, MA 02118. E-mail douglas.sawyer{at}bmc.org
Oxidative stress stimulates both growth and apoptosis in cardiac myocytes in vitro. We investigated whether oxidative stress mediates hypertrophy and apoptosis in cyclically stretched ventricular myocytes. Neonatal rat ventricular myocytes cultured on laminin-coated silastic membranes were stretched cyclically (1 Hz) at low (nominal 5%) and high (nominal 25%) amplitudes for 24 hours. Stretch caused a graded increase in superoxide anion production as assessed by superoxide dismutase (SOD)-inhibitable cytochrome c reduction or electron paramagnetic resonance spectroscopy. The role of reactive oxygen species (ROS) was assessed using the cell-permeable SOD/catalase mimetics Mn(II/III)tetrakis(1-methyl-4-peridyl) (MnTMPyP) and EUK-8. Stretch-induced increases in protein synthesis (3H-leucine incorporation) and cellular protein content were completely inhibited by MnTMPyP (0.05 mmol/L) at both low and high amplitudes of stretch. In contrast, while MnTMPyP inhibited basal atrial natriuretic factor (ANF) mRNA expression, the stretch-induced increase in ANF mRNA expression was not inhibited by MnTMPyP. In contrast to hypertrophy, only high-amplitude stretch increased myocyte apoptosis, as reflected by increased DNA fragmentation on gel electrophoresis and an 
3-fold increase in the number of TUNEL-positive myocytes. Similarly, only high-amplitude stretch increased the expression of bax mRNA. Myocyte apoptosis and bax expression stimulated by high-amplitude stretch were inhibited by MnTMPyP. Both low- and high-amplitude stretch caused rapid phosphorylation of ERK1/2, while high-, but not low-, amplitude stretch caused phosphorylation of JNKs. Activation of both ERK1/2 and JNKs was ROS-dependent. Thus, cyclic strain causes an amplitude-related increase in ROS, associated with differential activation of kinases and induction of hypertrophic and apoptotic phenotypes.
Key Words: oxidant stress • remodeling • apoptosis • hypertrophy
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