Neurological Disease Mechanisms and Treatments / Angiogenesis and VEGF in Cancer · Journal article

Deletion of RGS5 attenuates high-fat diet-induced cerebrovascular pathology and associated spatial memory deficits

Brain Behavior and Immunity · August 10, 2026

Promising Why this matters to you Expert discussion

Encouraging direction, but not yet definitive.

AI Summary

This preclinical study in RGS5 knockout mice demonstrates that deletion of RGS5 prevents high-fat diet–induced blood–brain barrier leakage, cerebrovascular pathology, microglial activation, and spatial memory impairment, despite ongoing metabolic dysfunction (obesity, glucose intolerance, insulin resistance). The findings suggest RGS5 as a potential therapeutic target but remain limited to a single animal model and require validation in larger or human studies before clinical translation.

What was studied

Controlled preclinical study in genetically modified and wildtype mice. RGS5 knockout and wildtype control mice; no additional eligibility criteria, setting, or specific strain details reported.. Intervention: Genetic deletion of RGS5 combined with high-fat diet for 23 weeks. Compared with: Wildtype mice on high-fat diet; also standard diet controls in both genotypes.

Key findings

High-fat diet induced obesity, glucose intolerance, and insulin resistance in all mice, confirming metabolic dysfunction In wildtype mice, HFD caused BBB leakage, immature angiogenesis, and pericyte activation; RGS5-KO mice were protected against all three RGS5 deletion prevented microglial activation and enhanced resting microglia–capillary interactions in striatal vessels

Safety

Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.

Who this may help

Preclinical evidence identifies RGS5 as a potential therapeutic target for preventing cognitive decline in diet-induced metabolic dysfunction, but the mechanism is demonstrated only in mice and must be validated before considering human trials or drug development.

Plain-language summary

A sound but limited preclinical study in knockout mice showing RGS5 deletion prevents diet-induced cerebrovascular pathology and spatial memory deficits, needing confirmation in larger or human studies.

Study design

As stated by the source record.

MethodsRGS5 knockout (KO) mice and wildtype (WT) controls were fed either standard or high-fat diet (HFD) for 23 weeks. Metabolic dysfunction was confirmed by measurement of weight gain, insulinemia, and glucose tolerance. BBB leakage, vascular pathology (vessel density, branching, pericyte density and coverage), microglial activation, and microglia–capillary interactions were analyzed using immunohistochemistry. Spatial memory was evaluated using the novel object location test.

DesignControlled preclinical study in genetically modified and wildtype mice

PopulationRGS5 knockout and wildtype control mice; no additional eligibility criteria, setting, or specific strain details reported.

InterventionGenetic deletion of RGS5 combined with high-fat diet for 23 weeks

ComparatorWildtype mice on high-fat diet; also standard diet controls in both genotypes

Reported figures

Quoted from the source exactly as published.

Diet duration23 weeks

Primary endpointSpatial memory preserved in RGS5-KO, impaired in WT mice on HFD

Clinical bottom line

Caveats

Sample sizes per group not reported; statistical power cannot be assessed
No blinding or randomization described; susceptible to detection and selection bias
Single animal model with limited translatability to human vascular dementia
Metabolic dysfunction persisted despite RGS5 deletion, raising questions about practical therapeutic utility

Evidence assessment

Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.

Study design

moderate

Controlled animal model with genetically modified and wildtype groups, standard methodology

Directness

limited

Preclinical mouse model; translational relevance to human cognitive decline unclear

Consistency

insufficient

Single study; no comparisons to prior RGS5 work in metabolic stress reported

Risk of bias

moderate

No blinding, randomization, or sample size justification described; animal studies prone to bias

Sample adequacy

insufficient

Group sizes not reported; unable to assess statistical power for endpoints

Source abstract

Diet-induced metabolic dysregulation is associated with cerebral microvascular pathology contributing to cognitive decline and vascular dementia. These alterations include blood-brain barrier (BBB) leakage, pericyte dysfunction, aberrant angiogenesis, and perivascular neuroinflammation. Restoration of BBB integrity has been achieved in other conditions by targeting pericytes, for example through knockout of Regulator of G-protein Signaling 5 (RGS5), a sensor protein for hypoxia and oxidative stress highly enriched in these cells. It remains unclear whether deletion of RGS5 can provide vascular protection in conditions of chronic metabolic stress and prevent cognitive impairment despite ongoing metabolic dysfunction. We used constitutional RGS5 knockout (KO) mice and wildtype (WT) controls fed a standard or high-fat diet (HFD) for 23 weeks to induce metabolic dysfunction, confirmed by weight gain, insulinemia, and impaired glucose tolerance. BBB leakage, vascular pathology (vessel density, branching, pericyte density and coverage), microglial activation and microglia-capillary interactions were analyzed using immunohistochemistry. Spatial memory was evaluated using the novel object location test. HFD induced obesity, glucose intolerance and insulin resistance in all mice. In WT but not RGS5-KO mice, HFD caused BBB leakage, immature angiogenesis, and pericyte activation. RGS5 deletion also prevented microglial activation and enhanced interactions between resting microglia and striatal vessels. Importantly, HFD-induced impairment of spatial memory was prevented in KO mice. These data suggest that deletion of RGS5 preserves BBB integrity, maintains microvascular homeostasis, reduces neuroinflammation, and ameliorates memory decline in diet-induced metabolic dysfunction. These findings highlight RGS5 as potential therapeutic target and emphasize microvascular dysfunction as contributor to HFD-induced cognitive decline.

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Neurological Disease Mechanisms and TreatmentsOsama F. ElabiAlba M. García-SerranoShubhangini TiwariCarlos Noriega PoloGesine PaulRobert CarlssonAngiogenesis and VEGF in Cancer