Key result
Female spontaneously hypertensive rats fed a purified diet exhibited significantly impaired coronary flow reserve compared to normotensive rats (1.70 vs 2.25, P=0.009), an effect prevented by a grain-based chow diet.
Why the study?
Effective treatment strategies and mechanistic understanding of coronary microvascular dysfunction remain limited, partly due to a scarcity of physiologically relevant animal models capturing hypertension, its predominant human risk factor.
Does a purified diet compared to a grain-based chow diet induce coronary microvascular dysfunction in female spontaneously hypertensive rats?
Does a purified diet compared to a grain-based chow diet induce coronary microvascular dysfunction in female spontaneously hypertensive rats?
A refined, phytochemical-depleted diet induces coronary microvascular dysfunction in female spontaneously hypertensive rats, establishing a clinically relevant animal model for hypertension-related CMD.
Answers are grounded in this paper and cite their sources.
Purified diets may confound rodent CMD models; leaves open translation to human hypertension-related microvascular dysfunction.
Coronary microvascular dysfunction (CMD) drives angina in patients with ischemia non-obstructive coronary artery disease, a condition that is more prevalent in females. Effective treatment strategies and a detailed mechanistic understanding of CMD remain limited, in part, due to scarcity of physiologically relevant animal models. Indeed, while CMD has been studied in animals with diabetes and/or fed high-fat diets, in fact, hypertension is the predominant risk factor for CMD in humans but is not captured by these models. Thus, we characterized the CMD that arose in female spontaneously hypertensive rats (SHRs). We measured coronary flow reserve, alongside basic cardiovascular function in SHRs and normotensive Wistar Kyoto rats (WKYs) fed a purified diet, as well as SHRs consuming a grain-based chow (GBC) diet. SHRs on a purified diet, but not WKYs or SHRs consuming GBC, exhibited impaired coronary flow reserve as assessed by echocardiography. Thus, SHRs develop a diet-dependent CMD, which can serve as a model to study hypertension-related CMD.
No takes yet. Share an insight, caveat, or question.
Najjar et al. (2025) studied Coronary microvascular dysfunction (CMD) and hypertension. Purified diet vs. Normotensive WKY rats on purified diet / SHRs on grain-based chow was evaluated on Coronary flow reserve (CFR) (p=0.009). Female spontaneously hypertensive rats fed a purified diet exhibited significantly impaired coronary flow reserve compared to normotensive rats (1.70 vs 2.25, P=0.009), an effect prevented by a grain-based chow diet.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: