How Does Cerebral Blood Flow Work?
Cerebral blood flow (CBF) is the volumetric rate of blood delivery to brain tissue, typically expressed in mL/100 g/min. This page outlines the mechanisms and research models used to study CBF regulation, including clini
Cerebral blood flow (CBF) is the volumetric rate of blood delivered to brain tissue, usually expressed in millilitres per 100 grams of brain tissue per minute (mL/100 g/min). It is the product of cerebral perfusion pressure and the inverse of cerebrovascular resistance, and it is held relatively constant across a range of systemic blood pressures by autoregulatory mechanisms. In research settings, CBF is measured by Doppler ultrasound resistive index, arterial spin labelling, or other perfusion-weighted imaging, and it is often reported alongside neurological severity scores or cognitive endpoints.
The work collected here centres on neurovascular and metabolic signalling pathways, including NAD+-dependent metabolism, reactive oxygen species (ROS) regulation, and peptide-mediated neuroprotection, as they relate to CBF and cerebrovascular function.
Research Studies
Avocado consumption and cerebral blood flow in pre-diabetic adults
A 12-week randomised crossover intervention is assessing the effect of daily avocado consumption on cerebral blood flow and markers of cardio- and vascular health in the periphery and the brain. The study population is 34 men and women aged 40–75 years with pre-diabetes and overweight or obesity. Secondary objectives include brain insulin sensitivity after intranasal insulin delivery, vascular function, metabolic markers, cognition, and psychological well-being [1].
Citicoline and cerebral Doppler resistive index in neonatal hypoxic-ischemic encephalopathy
A clinical trial is determining the efficacy of citicoline in improving cerebral blood flow parameters and neurological status among neonates with hypoxic-ischemic encephalopathy. The primary outcomes are the Doppler resistive index and the Sarnat-Sarnat score after 72 hours of therapy [2].
Nicotinamide riboside and cerebral blood flow in amnestic mild cognitive impairment
A 12-week double-blind, randomised, placebo-controlled pilot study evaluated the safety, tolerability, and preliminary efficacy of the NAD+ precursor nicotinamide riboside (NR) for enhancing cognitive function and cerebral blood flow in adults with amnestic mild cognitive impairment (aMCI). Forty-two participants completed the study (NR = 22, placebo = 20). Adherence was similar between groups with no serious adverse effects, and blood NAD+ increased twofold in the NR group. There were no improvements in cognitive or CBF outcomes reported in the available abstract [4].
Pterostilbene derivatives and cerebral ischemia-reperfusion injury
Pterostilbene (Pts), a small molecule stilbenoid and dimethyl analogue of resveratrol, exerts blood-brain barrier protection in cerebral ischemia-reperfusion injury. A structural optimisation study generated a series of Pts derivatives and investigated their anti-ischemic activities both in vitro and in vivo. ADMET methods predicted drug-likeness, and in vitro MTT cell viability analysis was conducted on neuroblastoma cells (SH-SY5Y) and brain microvascular endothelial cells [5].
ACTH-like peptides and brain gene expression after experimental stroke
Ischemic stroke results from a disruption of cerebral blood flow. Adrenocorticotropic hormone (ACTH) serves as the basis for synthetic peptides developed as neuroprotective agents for stroke therapy. Using RNA-Seq, researchers identified differentially expressed genes associated with ACTH(4-7)PGP (Semax) and ACTH(6-9)PGP peptides under cerebral ischemia conditions at 4.5 hours after transient middle cerebral artery occlusion (tMCAO) in the ipsilateral frontal cortex of rat brain. A follow-up analysis examined the penumbra-associated frontal cortex of rats and the actions of the same peptides at 24 hours after tMCAO using RNA-Seq [6].
Reactive oxygen species and cerebral blood flow regulation in healthy adults
A clinical trial is testing the role of reactive oxygen species (ROS) in regulating cerebral blood flow. Thirty participants (15 males and 15 females) aged 18–40 years and considered healthy will be enrolled. Participants can expect to be on study for two study visits over a 6-month period [7].
Dasatinib and quercetin in adults at risk for Alzheimer's disease
A pilot study is demonstrating the safety and feasibility of administering intermittent doses of dasatinib and quercetin (D+Q) in older adults at risk of Alzheimer's disease (AD). The study will evaluate whether giving D+Q may improve cerebral blood flow regulation, mobility, and cognition in older adults, and thus may prevent progression to Alzheimer's disease [8].
Nutritional intervention and oral health in older adults with complete dentures
A clinical trial is testing a nutritional intervention for older adults who wear complete removable dentures. The main questions include whether the intervention improves diet quality, nutritional status, chewing performance, muscle strength, masticatory muscle thickness, and stress and muscle health markers in saliva [3].
Comparison of cerebral blood flow study designs
| Study | Population | Intervention/Exposure | Primary CBF-related outcome |
|---|---|---|---|
| Avocado consumption [1] | Pre-diabetic adults with overweight/obesity, 40–75 years | Daily avocado, 12 weeks | Cerebral blood flow |
| Citicoline [2] | Neonates with hypoxic-ischemic encephalopathy | Citicoline | Doppler resistive index |
| Nicotinamide riboside [4] | Adults with amnestic mild cognitive impairment | NR, 12 weeks | Cerebral blood flow |
| Pterostilbene derivatives [5] | In vitro (SH-SY5Y, brain microvascular endothelial cells) and in vivo | Pts derivatives | Anti-ischemic activity |
| ACTH-like peptides [6] | Rat tMCAO model | Semax, ACTH(6-9)PGP | Gene expression in penumbra |
| ROS regulation [7] | Healthy adults, 18–40 years | Hyperoxia | Cerebral blood flow |
| Dasatinib + quercetin [8] | Older adults at risk for Alzheimer's disease | Intermittent D+Q | Cerebral blood flow regulation |
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Sources
- [1] Long-term Effects of Avocado Consumption on Health in Pre-diabetic Individuals
- [2] Effect of Citicoline on Neurological Severity Score and Cerebral Doppler Resistive Index in Neonatal Hypoxic Ischemic Encephalopathy
- [3] Nutritional Intervention for Older Adults With Complete Dentures
- [4] A phase-II randomized controlled pilot study of nicotinamide riboside supplementation in older adults with amnestic mild cognitive impairment.
- [5] Structural Optimization of Pterostilbene, a Promising Lead Molecule, and Evaluation of Its Derivatives via ADMET Prediction and In Vitro/In Vivo Anti-Cerebral Ischemic Activity.
- [6] ACTH-like Peptides Compensate Rat Brain Gene Expression Profile Disrupted by Ischemia a Day After Experimental Stroke.
- [7] HYPEROXIA Responses and ROS
- [8] Safety and Feasibility of Dasatinib and Quercetin in Adults at Risk for Alzheimer's Disease