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• W2041088809 abstract "A decrease in sarcoplasmic reticulum Ca(2+) pump (SERCA2) activity is believed to play a role in the impairment of diastolic function of the failing heart. Because the expression ratio of phospholamban (PL) to SERCA2 may be a target to improve contractile dysfunction, a PL antisense RNA strategy was developed under the control of either a constitutive cytomegalovirus (CMV) or an inducible atrial natriuretic factor (ANF) promoter. The latter is upregulated in hypertrophied and failing heart, allowing induction-by-disease gene therapy.Part of the PL cDNA was cloned in antisense and sense directions into adenovectors under the control of either a CMV (Ad5CMVPLas and Ad5CMVPLs, respectively) or ANF (Ad5ANFPLas and Ad5ANFPLs, respectively) promoter. Infection of cultured rat neonatal cardiomyocytes with Ad5CMVPLas reduced PL mRNA to 30+/-7% of baseline and PL protein to 24+/-3% within 48 and 72 hours, respectively. The effects were vector dose dependent. Ad5CMVPLas increased the Ca(2+) sensitivity of SERCA2 and reduced the time to 50% recovery of the Ca(2+) transient. A decrease of PL protein was also achieved by infection with Ad5ANFPLas, and the presence of the hypertrophic stimulus, endothelin-1, led to enhanced downregulation of PL. The adenovectors expressing PL sense RNA had no effect on any of the tested parameters.Vector-mediated PL antisense RNA expression may become a feasible approach to modulate myocyte Ca(2+) homeostasis in the failing heart. The inducible ANF promoter for the first time offers the perspective for induction-by-disease gene therapy, ie, selective expression of therapeutic genes in hypertrophied and failing cardiomyocytes." @default.
• W2041088809 created "2016-06-24" @default.
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• W2041088809 date "2000-05-09" @default.
• W2041088809 modified "2023-10-17" @default.
• W2041088809 title "Adenovirus-Based Phospholamban Antisense Expression as a Novel Approach to Improve Cardiac Contractile Dysfunction" @default.
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• W2041088809 doi "https://doi.org/10.1161/01.cir.101.18.2193" @default.
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