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Resibufogenin promotes angiogenesis via the VAV3-mediated ITGA5–VEGF signaling axis in macrophages to alleviate myocardial infarction

Abstract

Myocardial infarction (MI) continues to be a leading cause of global mortality. Resibufogenin (RBG), a principal bioactive constituent derived from Venenum Bufonis, is well recognized for its potent cardiotonic properties. Nevertheless, the therapeutic potential of RBG in the context of MI remains to be fully elucidated. This study revealed that RBG exerted significant cardioprotective effects in a murine model of MI by preserving cardiac function, attenuating myocardial injury, and increasing vascular density. Proteomic analysis revealed that angiogenesis was the predominant biological process associated with RBG-responsive proteins. Integrated proteomic analysis and mechanistic validation demonstrated that RBG activated the ITGA5–VEGF signaling axis, a pathway essential for its therapeutic efficacy, in a macrophage-dependent manner. Notably, both pharmacological inhibition of ITGA5 and depletion of macrophages completely abrogated RBG-mediated cardioprotection in the MI model. Furthermore, RBG significantly increased endothelial cell proliferation, migration, and tube formation in a macrophage–endothelial cell coculture system. More importantly, RBG upregulated ITGA5 expression in macrophages through activation of the VAV3/CDC42 signaling pathway. Collectively, these findings demonstrate that RBG is a promising therapeutic agent for myocardial infarction and acts via the macrophage-specific VAV3/CDC42-mediated ITGA5/VEGF signaling pathway to promote reparative angiogenesis. This study elucidates the cardioprotective effects and underlying mechanisms of RBG and establishes a scientific basis for the discovery of novel therapeutic agents from natural products.

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Fig. 1: RBG improved cardiac function and alleviated myocardial ischemic injury after MI.
The alternative text for this image may have been generated using AI.
Fig. 2: RBG alleviated myocardial fibrosis and hypertrophy in MI mice.
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Fig. 3: RBG exerted cardioprotective effects by promoting angiogenesis.
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Fig. 4: The ameliorative effect of RBG on mice post-MI was dependent on ITGA5.
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Fig. 5: RBG modulated the ITGA5/FAK/VEGF signaling axis in macrophages.
The alternative text for this image may have been generated using AI.
Fig. 6: Systemic depletion of macrophages reduced the efficacy of RBG therapy.
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Fig. 7: RBG regulated endothelial cell function and stimulated angiogenesis in a macrophage ITGA5-dependent manner.
The alternative text for this image may have been generated using AI.
Fig. 8: RBG promoted ITGA5 expression via the VAV3-mediated activation of CDC42.
The alternative text for this image may have been generated using AI.
Fig. 9: Schematic model illustrating the cardioprotective mechanisms of RBG.
The alternative text for this image may have been generated using AI.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (G2024YFC3506700 and 2024YFC3506704); the National Natural Science Foundation of China (U25A20597); the Shanghai Science and Technology Development Fund (Central-Local Guiding Program, YDZX20223100001004); and the Traditional Chinese and Western Medicine Collaborative Guidance Project of Integrated Hospitals from the Shanghai Municipal Health Commission/Shanghai Municipal Administration of Traditional Chinese Medicine (ZXXT-202303).

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RW: Methodology, Investigation, Data Curation, Writing – Original Draft, and Writing – Review & Editing. GQL: Conceptualization and Supervision. FYW: Investigation and Data Curation. YC: Investigation and Data Curation. SJP: Conceptualization, Supervision, and Writing – Review & Editing. JGZ: Conceptualization, Supervision, Writing – Review & Editing, and Funding Acquisition.

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Correspondence to Shou-jiao Peng or Jian-ge Zhang.

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Wang, R., Lin, Gq., Wang, Fy. et al. Resibufogenin promotes angiogenesis via the VAV3-mediated ITGA5–VEGF signaling axis in macrophages to alleviate myocardial infarction. Acta Pharmacol Sin (2026). https://doi.org/10.1038/s41401-026-01799-5

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