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(Circulation. 2000;101:1578.)
© 2000 American Heart Association, Inc.

Basic Science Reports

Enhanced Cardiac Contractility After Gene Transfer of V2 Vasopressin Receptors In Vivo by Ultrasound-Guided Injection or Transcoronary Delivery

Hans-Jörg Weig, MD; Karl-Ludwig Laugwitz, MD; Alessandra Moretti, PhD; Kai Kronsbein, BS; Christian Städele, MD; Stefan Brüning, MD; Melchior Seyfarth, MD; Thomas Brill, MD; Albert Schömig, MD; Martin Ungerer, MD

From the 1. Medizinische Klinik (H.-J.W., K.-L.L., A.M., K.K., M.S., A.S., M.U.), and Institut für Experimentelle Onkologie/Therapieforschung (C.S., S.B., T.B.), Klinikum rechts der Isar, Technische Universität, München, Germany.

Correspondence to PD Dr Ungerer, 1. Medizinische Klinik and Deutsches Herzzentrum, Klinikum rechts der Isar, Ismaninger Straße 22, D-81675 München, Germany. E-mail ungerer{at}med1.med.tu-muenchen.de

Background—Systemic levels of arginine vasopressin (AVP) are increased in congestive heart failure, resulting in vasoconstriction and reduced cardiac contractility via V₁ vasopressin receptors. V₂ vasopressin receptors (V2Rs), which promote activation of adenylyl cyclase, are physiologically expressed only in the kidney and are absent in the myocardium. Heterologous expression of V2Rs in the myocardium could result in a positive inotropic effect by using the endogenous high concentrations of AVP in heart failure.

Methods and Results—We tested gene transfer with a recombinant adenovirus for the human V2R (Ad-V2R) to stimulate contractility of rat or rabbit myocardium in vivo. Ultrasound-guided direct injection or transcoronary delivery of adenovirus in vivo resulted in recombinant receptor expression in the myocardial target area, leading to a substantial increase in [³H]AVP binding. In 50% of the cardiomyocytes isolated from the directly injected area, single-cell shortening measurements detected a significant increase in contraction amplitude after exposure to AVP or the V2R-specific desmopressin (DDAVP). Echocardiography of the target myocardial area documented a marked increase in local fractional shortening after systemic administration of DDAVP in V2R-expressing animals but not in control virus–treated hearts. Simultaneous measurement of global contractility (dP/dt_max) confirmed a positive inotropic effect of DDAVP on left ventricular function in the Ad-V2R–injected animals.

Conclusions—Adenoviral gene transfer of the V2R into the myocardium increases cardiac contractility in vivo. Heterologous expression of cAMP-forming receptors in the myocardium could lead to novel strategies in the therapy of congestive heart failure by bypassing the desensitized ß-adrenergic receptor–signaling cascade.

Key Words: adenovirus • gene transfer • vasopressin • myocardium

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