Abstract
Chronic inotropic therapy is effective for the treatment of heart failure with reduced ejection fraction, but has been limited by adverse long-term safety profiles, development of tolerance, and the need for chronic parenteral administration. A safe and convenient therapeutic agent that produces sustained inotropic effects could improve symptoms, functional capacity, and quality of life. Small amounts of 2-deoxy-adenosine triphosphate (dATP) activate cardiac myosin leading to enhanced contractility in normal and failing heart muscle. Cardiac myosin activation triggers faster myosin crossbridge cycling with greater force generation during each contraction. This paper describes the rationale and results of a translational medicine effort to increase dATP levels using a gene therapy strategy to deliver and upregulate ribonucleotide reductase (R1R2), the enzyme responsible for dATP synthesis, selectively in cardiomyocytes. In small and large animal models of heart failure, a single dose of this gene therapy has led to sustained inotropic effects with a benign safety profile. Further animal studies are appropriate with the goal of testing this agent in patients with heart failure.
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Abbreviations
- AAV6-R1:
-
Single AAV6 vector expressing R1 subunit
- AAV6-R1.2:
-
Single AAV6 vector expressing R1 & R2 subunits, linked by P2a
- AAV6-R2:
-
Single AAV6 vector expressing R2 subunit
- AV-R1:
-
Single AV vector expressing R1 subunit
- AV-R2:
-
Single AV vector expressing R2 subunit
- BB-R12:
-
AAV6 viral vector with a cardiac-specific promoter cTnT455 to overexpress R1R2 in the heart
- dATP:
-
2-Deoxy-adenosine triphosphate
- HF:
-
Heart failure
- R1:
-
Rrm1 subunit of ribonucleotide reductase
- R1R2:
-
Ribonucleotide reductase
- R2:
-
Rrm2 subunit of ribonucleotide reductase
- TgRR:
-
Transgenic mouse model overexpressing R1R2
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Disclosures
MR is a scientific founder and equity holder in BEAT Biotherapeutics Corp. SLT is an employee of BEAT Biotherapeutics Corp.
Sources of Funding
Work in MR’s laboratory was supported by NIH grants R01 HL061683, R01 HL065497, R01 HL111197, and R21 HL091368.
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Teichman, S.L., Thomson, K.S., Regnier, M. (2016). Cardiac Myosin Activation with Gene Therapy Produces Sustained Inotropic Effects and May Treat Heart Failure with Reduced Ejection Fraction. In: Bauersachs, J., Butler, J., Sandner, P. (eds) Heart Failure. Handbook of Experimental Pharmacology, vol 243. Springer, Cham. https://doi.org/10.1007/164_2016_31
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DOI: https://doi.org/10.1007/164_2016_31
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