What does this research mean for the field?

Angiotensin II exacerbates intracerebral hemorrhage by acting as a key coagulation regulator through heparin-like antithrombin activation, a mechanism that functions independently of the Angiotensin II receptor. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.ESTABLISHES_NEW_DIRECTION.

What question did this study set out to answer?

Determine the molecular mechanism by which angiotensin II contributes to the paradoxical bleeding predisposition seen in hypertension and worsens intracerebral hemorrhage.

September 15, 2026Nature CommunicationsOpen Access

Angiotensin II exacerbates intracerebral hemorrhage in mice via heparin-like antithrombin activation and coagulation dysfunction

Q: What are the key findings of this study?

A single injection of Angiotensin II exacerbated intracerebral hemorrhage and inhibited coagulation in mice by potentiating antithrombin, whereas an anti-Ang II monoclonal antibody promoted coagulation and alleviated hemorrhage.

Q: What is the clinical evidence from this study?

Study design: Other. Population: Intracerebral hemorrhage and thrombosis. Intervention: Angiotensin II (Ang II) and anti-Ang II monoclonal antibody vs. 0.9% NaCl or IgG control. Primary outcome: Coagulation parameters (APTT, PT, bleeding time) and intracerebral hemorrhage hematoma volume (p=<0.0001).

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Key result

Angiotensin II exacerbates intracerebral hemorrhage in mice by potentiating antithrombin, while anti-Ang II antibodies alleviate bleeding.

P<0.0001

Why the study?

Hypertension exhibits a paradoxical prothrombotic-hemorrhagic predisposition toward cerebral infarction and intracerebral hemorrhage, but the underlying mechanism remains poorly understood.

Does Angiotensin II modulate coagulation and intracerebral hemorrhage in mice?

Population

Mice, including hypertensive mice

Comparison

Angiotensin II vs anti-Ang II monoclonal antibody vs Ang II receptor blockade or deficiency

Design

Preclinical animal study

Authors

SWShaoying Wang MXMin Xue MYMusan Yan

Discussion

Member takes

Overview

May exacerbate ICH via antithrombin activation in hypertensive mice; leaves open whether anti-Ang II antibodies reduce human cerebral bleeding risk.

Key Points

Determine the molecular mechanism by which angiotensin II contributes to the paradoxical bleeding predisposition seen in hypertension and worsens intracerebral hemorrhage.
Characterized the direct allosteric modulation of the antithrombin 386-397 loop by angiotensin II and its acceleration of thrombin inhibition in vitro.
Evaluated thrombosis and intracerebral hemorrhage severity in wild-type, angiotensin II receptor-deficient, receptor-blocked, and hypertensive mouse models treated with angiotensin II or anti-angiotensin II monoclonal antibodies.
Angiotensin II acted as an allosteric cofactor that accelerates antithrombin inhibition of thrombin through a heparin-like mechanism.
In vivo administration of angiotensin II suppressed clotting, which reduced thrombosis but exacerbated intracerebral hemorrhage independently of canonical angiotensin II receptors.
Treatment with an anti-angiotensin II monoclonal antibody restored coagulation and significantly ameliorated intracerebral hemorrhage in both normotensive and hypertensive mice.

Structured PICO

Does Angiotensin II modulate coagulation and intracerebral hemorrhage in mice?

Population

Preclinical study using wild-type, AGTR1 knockout, and 2K1C hypertensive mice to evaluate the acute effects of Angiotensin II on coagulation and intracerebral hemorrhage.

Intervention

Angiotensin II or anti-Angiotensin II monoclonal antibody

Comparator

Control (implied)

Outcome

Coagulation function, thrombus formation, and intracerebral hemorrhage severitysurrogate

Main Result

p-value: p=<0.0001

Angiotensin II acts as a heparin-like coagulation regulator that exacerbates intracerebral hemorrhage, suggesting a novel therapeutic target for cerebral bleeding.

Limitations

Preclinical animal study requiring clinical validation
Functional inhibition in physiological settings may involve indirect or synergistic mechanisms not fully captured in vitro
Differences between acute and chronic Ang II exposure effects need further exploration

Cite This Study

Wang et al. (2026) studied Intracerebral hemorrhage and thrombosis. Angiotensin II (Ang II) and anti-Ang II monoclonal antibody vs. 0.9% NaCl or IgG control was evaluated on Coagulation parameters (APTT, PT, bleeding time) and intracerebral hemorrhage hematoma volume (p=<0.0001). A single injection of Angiotensin II exacerbated intracerebral hemorrhage and inhibited coagulation in mice by potentiating antithrombin, whereas an anti-Ang II monoclonal antibody promoted coagulation and alleviated hemorrhage.

synapsesocial.com/papers/6aa90187eed42882c1fc19ff https://doi.org/10.1038/s41467-026-77481-5

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September 15, 2026Nature CommunicationsOpen Access

Angiotensin II exacerbates intracerebral hemorrhage in mice via heparin-like antithrombin activation and coagulation dysfunction

View Full Paper

Ask AI

Bookmark

Key result

Angiotensin II exacerbates intracerebral hemorrhage in mice by potentiating antithrombin, while anti-Ang II antibodies alleviate bleeding.

P<0.0001

Why the study?

Hypertension exhibits a paradoxical prothrombotic-hemorrhagic predisposition toward cerebral infarction and intracerebral hemorrhage, but the underlying mechanism remains poorly understood.

Does Angiotensin II modulate coagulation and intracerebral hemorrhage in mice?

Population

Mice, including hypertensive mice

Comparison

Angiotensin II vs anti-Ang II monoclonal antibody vs Ang II receptor blockade or deficiency

Design

Preclinical animal study

Authors

SWShaoying Wang MXMin Xue MYMusan Yan

Discussion

Member takes

Overview

May exacerbate ICH via antithrombin activation in hypertensive mice; leaves open whether anti-Ang II antibodies reduce human cerebral bleeding risk.

Key Points

Determine the molecular mechanism by which angiotensin II contributes to the paradoxical bleeding predisposition seen in hypertension and worsens intracerebral hemorrhage.
Characterized the direct allosteric modulation of the antithrombin 386-397 loop by angiotensin II and its acceleration of thrombin inhibition in vitro.
Evaluated thrombosis and intracerebral hemorrhage severity in wild-type, angiotensin II receptor-deficient, receptor-blocked, and hypertensive mouse models treated with angiotensin II or anti-angiotensin II monoclonal antibodies.
Angiotensin II acted as an allosteric cofactor that accelerates antithrombin inhibition of thrombin through a heparin-like mechanism.
In vivo administration of angiotensin II suppressed clotting, which reduced thrombosis but exacerbated intracerebral hemorrhage independently of canonical angiotensin II receptors.
Treatment with an anti-angiotensin II monoclonal antibody restored coagulation and significantly ameliorated intracerebral hemorrhage in both normotensive and hypertensive mice.

Structured PICO

Does Angiotensin II modulate coagulation and intracerebral hemorrhage in mice?

Population

Preclinical study using wild-type, AGTR1 knockout, and 2K1C hypertensive mice to evaluate the acute effects of Angiotensin II on coagulation and intracerebral hemorrhage.

Intervention

Angiotensin II or anti-Angiotensin II monoclonal antibody

Comparator

Control (implied)

Outcome

Coagulation function, thrombus formation, and intracerebral hemorrhage severitysurrogate

Main Result

p-value: p=<0.0001

Angiotensin II acts as a heparin-like coagulation regulator that exacerbates intracerebral hemorrhage, suggesting a novel therapeutic target for cerebral bleeding.

Limitations

Preclinical animal study requiring clinical validation
Functional inhibition in physiological settings may involve indirect or synergistic mechanisms not fully captured in vitro
Differences between acute and chronic Ang II exposure effects need further exploration

Cite This Study

synapsesocial.com/papers/6aa90187eed42882c1fc19ff https://doi.org/10.1038/s41467-026-77481-5

Also Consider

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