What is the clinical evidence from this study?

Study design: Other. Population: Ischemia and reperfusion injury / Myocardial infarction. Intervention: Cardiomyocyte-specific BK channel deletion vs. Litter-matched controls. Primary outcome: Infarct size.

What does this research mean for the field?

Cardiomyocyte-specific BK channel deletion in mice increases susceptibility to ischemia/reperfusion injury and is necessary for the cardioprotective effects of cGMP-elevating agents and ischemic conditioning. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine whether cardioprotection mediated by cGMP signaling and ischemic conditioning requires BK channels localized in cardiomyocytes versus vascular smooth muscle cells.

August 17, 2026CirculationOpen Access

cGMP-Elevating Compounds and Ischemic Conditioning Provide Cardioprotection Against Ischemia and Reperfusion Injury via Cardiomyocyte-Specific BK Channels

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Key result

Cardiomyocyte-specific BK channel deletion in mice worsens infarct size and myocardial strain versus controls.

Why the study?

It remained unclear whether molecular events downstream of cGMP involving BK channels favor myocardial survival via BK channels in cardiomyocytes or in other cardiac cell types.

Do cGMP-elevating compounds and ischemic conditioning provide cardioprotection against ischemia and reperfusion injury via cardiomyocyte-specific BK channels in a mouse model of myocardial infarction?

Population

Gene-targeted mice with cardiomyocyte- or smooth muscle cell-specific BK deletion, global BK knockouts, and controls

Comparison

Mechanical conditioning, cGMP pathway stimulation, or direct BK modulators vs controls

Design

In vivo preclinical open-chest and chronic myocardial infarction models

Follow-up

4 weeks of reperfusion

Authors

SFSandra FrankenreiterBoehringer Ingelheim (Germany)PBPiotr BednarczykWarsaw University of Life Sciences AKAngelina KniessUniversity of Tübingen

Discussion

Member takes

Implication

CMBK deletion enlarges infarcts after I/R in mice; leaves open whether CMBK activation confers clinical cardioprotection.

Key Points

To determine whether cardioprotection mediated by cGMP signaling and ischemic conditioning requires BK channels localized in cardiomyocytes versus vascular smooth muscle cells.
Generated conditional knockout mice lacking BK channels specifically in cardiomyocytes (CMBK) or smooth muscle cells (SMBK) and compared them with global BK knockout and wild-type mice.
Subjected mice to an open-chest myocardial infarction model with or without ischemic preconditioning, postconditioning, or pharmacological cGMP activators and PDE5 inhibitors.
Evaluated acute infarct size, troponin I, reactive oxygen species, survival kinase signaling, and assessed long-term cardiac fibrosis and myocardial strain at 4 weeks of reperfusion.
CMBK and global BK knockout mice displayed significantly larger infarct sizes, higher cardiac troponin I release, increased reactive oxygen species, and greater apoptosis compared to controls, whereas SMBK knockouts did not.
Loss of CMBK abolished the cardioprotective benefits typically provided by sGC activators (cinaciguat, riociguat), PDE-5 inhibitors, and mechanical ischemic pre- and postconditioning.
At 4 weeks of reperfusion, CMBK-deficient mice exhibited significantly increased myocardial fibrosis and impaired strain echocardiography.

Structured PICO

Population

Gene-targeted mice with cardiomyocyte- or smooth muscle cell-specific deletion of BK channels subjected to an open-chest model of myocardial infarction.

Exposure

Mechanical conditioning (ischemic preconditioning and postconditioning) or pharmacological stimulation of the cGMP pathway (cinaciguat, riociguat, and phosphodiesterase-5 inhibitors)

Comparator

Litter-matched controls and wild-type mice

Outcome

Infarct size and cardiac damage (assessed by serum cardiac troponin I, reactive oxygen species, phosphorylated ERK/AKT levels, and myocardial apoptosis)surrogate

Cardiomyocyte-specific BK channels are essential for the cardioprotective effects of cGMP-elevating compounds and ischemic conditioning against ischemia/reperfusion injury, highlighting them as a potential therapeutic target.

Cite This Study

Frankenreiter et al. (2017) studied Ischemia and reperfusion injury / Myocardial infarction. Cardiomyocyte-specific BK channel deletion vs. Litter-matched controls was evaluated on Infarct size. Cardiomyocyte-specific BK channel deletion in mice resulted in significantly larger infarct sizes and compromised myocardial strain echocardiography compared with controls.

synapsesocial.com/papers/6a82d209f4d32e7a04e06d9e https://doi.org/10.1161/circulationaha.117.028723

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cGMP-Elevating Compounds and Ischemic Conditioning Provide Cardioprotection Against Ischemia and Reperfusion Injury via Cardiomyocyte-Specific BK Channels

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

cGMP-Elevating Compounds and Ischemic Conditioning Provide Cardioprotection Against Ischemia and Reperfusion Injury via Cardiomyocyte-Specific BK Channels

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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