Why the study?
The initial purpose was to determine whether PAI-1 deletion influenced ATAA development, and subsequently to define early pathological events preceding cardiac fibrosis in PAI-1 deficiency and the protective structural domain.
Population
Whole-body PAI-1 deficient (PAI-1-/-) mice, wild-type littermates (PAI-1+/+), and PAI-1 point mutation mice
Comparison
Angiotensin II or norepinephrine vs saline infusion across genotypes
Design
Preclinical animal study
Authors
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PAI-1 deletion effects in AngII models warrant caution in preclinical targeting; leaves open human ATAA and fibrosis mechanisms.
PAI-1 deficiency promotes early cardiac hemorrhage and subsequent fibrosis under hemodynamic stress, suggesting a protective role for PAI-1's protease-inhibitory function against hypertensive cardiac injury.
Pettey et al. (2025) studied this question.
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