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Published on: July 10, 2019
Inhibition of adenosine kinase alleviates hypertrophic cardiomyopathy by ameliorating coronary microvascular
Fangfang Wan1, Bingxuan Ma1, Ziqiang Han1
1State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 167 Beilishi Road, Xicheng District, Beijing 100037, China.
Insights
Hypertrophic cardiomyopathy (HCM) treatment needs new targets. Adenosine kinase (ADK) is a causal gene for HCM, and inhibiting it with dabigatran shows therapeutic promise.
Area of Science:
- Cardiovascular Genetics
- Pharmacology
- Molecular Medicine
Background:
- Hypertrophic cardiomyopathy (HCM) presents significant therapeutic challenges with limited treatment options.
- There is an urgent need to identify novel therapeutic targets for HCM.
Purpose of the Study:
- To identify causal druggable genes for Hypertrophic cardiomyopathy (HCM) using genetic analyses.
- To validate Adenosine kinase (ADK) as a therapeutic target and explore drug repurposing for HCM treatment.
Main Methods:
- Mendelian randomization and colocalization analyses were performed using large-scale HCM genome-wide association data.
- Candidate gene ADK was validated in HCM mice and endothelial cells (ECs); drug repurposing involved molecular docking, simulations, and CETSA.
- In vitro and in vivo functional verification of ADK inhibition and potential drugs was conducted.
Main Results:
- Adenosine kinase (ADK) was identified as a causal gene for HCM.
- ADK inhibition in HCM mice attenuated cardiac hypertrophy, fibrosis, and microvascular dysfunction, and rescued EC function.
- Dabigatran was identified as a high-affinity ADK binder, and its administration ameliorated microvascular dysfunction and cardiac remodeling in HCM mice.
Conclusions:
- Adenosine kinase (ADK) is established as a viable therapeutic target for Hypertrophic cardiomyopathy (HCM).
- Targeting ADK offers a promising strategy for managing microvascular dysfunction in HCM.
- Drug repurposing suggests dabigatran may benefit HCM patients through ADK inhibition.
Aims:
Hypertrophic cardiomyopathy (HCM) remains challenging with limited treatment options; the identification of novel therapeutic targets is urgently needed.
Methods:
We performed Mendelian randomization and colocalization analyses using HCM genome-wide association data (FinnGen: 1376 cases/210 300 controls; IEU OpenGWAS: 507 cases/489 220 controls) to identify causal druggable genes. The lead candidate gene was validated in HCM mice and endothelial cells (EC). Drug repurposing with molecular docking, dynamics simulations, and cellular thermal shift assay identified potential drugs, followed by in vitro and in vivo functional verification.
Results:
Adenosine kinase (ADK) was identified as a causal gene for HCM (Mendelian randomization: odds ratio (OR) = 1.10, 95%CI 1.02-1.19, P = .015; validation: OR = 1.28, 1.01-1.61, P = .039; colocalization: PP.H4 = 82.0%). In HCM mice, ADK inhibition attenuated cardiac hypertrophy, fibrosis, and microvascular dysfunction. ADK inhibition rescued the impaired function of ECs induced by Ang II stimulation in vitro. Drug repurposing identified the anticoagulant dabigatran as the high-affinity ADK binder with the highest binding energy (-9.3 kcal/mol), as confirmed using molecular dynamics simulations and cellular thermal shift assay. Consistently, dabigatran improved EC function in vitro and, in HCM mice, ameliorated microvascular dysfunction and pathological cardiac remodelling.
Conclusions:
Our study established ADK as a therapeutic target for HCM treatment. Targeting ADK is a promising strategy for ameliorating microvascular dysfunction in HCM. Drug repurposing findings suggest that dabigatran may confer benefits in HCM via ADK inhibition.
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