Abstract.
Objective
Two types of hemodynamic overload, pressure and volume overload, result in morphologically distinct types of cardiac remodeling. We explored the possibility that distinct hemodynamic overload may differentially activate the signal transduction pathway.
Methods
Pressure and volume overload were induced by thoracic aortic banding and carotid–jugular shunt formation in rabbits, respectively. Phosphorylation activities of mitogen–activated protein (MAP) kinase families, Akt, and signal transducer and activator of transcription (STAT) 3 in the left ventricular myocardium were determined by Western blotting using phospho–specific antibodies and were compared between hypertrophied hearts by pressure and volume overload.
Results
Pressure and volume overload produced concentric and eccentric cardiac hypertrophy in rabbits, respectively. In pressure–overloaded hearts, extracellular signal–regulated kinase (ERK) 1/2, p38 MAP kinase, and STAT3 were transiently activated prior to hypertrophic changes. In contrast, activation of ERK1/2, but not p38 MAP kinase and STAT3, was observed only at 12 weeks after shunt surgery. Pressure overload evoked short and biphasic activation of Akt at 15 min and 1 day after aortic banding. In contrast, volume overload induced sustained activation of Akt from 1 day to 1 week. Concordant phosphorylation of downstream targets of Akt, glycogen synthase kinase–3β (GSK–3β) and p70 ribosomal S6 kinase (p70S6K), in response to Akt activation was observed at 15 min after pressure overload. However in volume–overloaded hearts, phosphorylation of GSK-3β and p70S6K was observed at 6 weeks and at 6 and 12 weeks, respectively, and was not coincident with Akt activation. These findings suggest that phosphorylation of GSK-3β and p70S6K is regulated by an alternative pathway other than Akt in volume–overloaded hearts.
Conclusion
Pressure and volume overload–induced cardiac hypertrophy is associated with distinct patterns of activation of signal transduction pathways. These data may suggest that stimulus–specific heterogeneity in the signaling pathway plays a role in determining the type of cardiac hypertrophy.
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Miyamoto, T., Takeishi, Y., Takahashi, H. et al. Activation of distinct signal transduction pathways in hypertrophied hearts by pressure and volume overload . Basic Res Cardiol 99, 328– 337 (2004). https://doi.org/10.1007/s00395-004-0482-7
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DOI: https://doi.org/10.1007/s00395-004-0482-7