Application and Prospects of Butylphthalide for the Treatment of Neurologic Diseases
If you’ve ever added celery to a salad or used celery oil in cooking, you might be surprised to learn it contains a compound with promising benefits for brain health. That compound is 3-N-butylphthalide (NBP), a naturally occurring molecule now studied extensively for its ability to treat neurological diseases. A 2019 review by researchers from the Second Xiangya Hospital of Central South University (Changsha, China) summarizes NBP’s mechanisms, clinical uses, and future potential—offering hope for conditions like stroke, Alzheimer’s disease, and Parkinson’s disease.
What Is Butylphthalide (NBP)?
NBP is a family of chemical isomers: l-NBP (from celery oil) and dl-NBP (a synthetic version approved for medical use). DL-NBP is fat-soluble, meaning it easily crosses the blood-brain barrier (a protective layer that keeps harmful substances out of the brain). It’s rapidly absorbed (peak blood levels in ~1.25 hours) and has a long half-life (11.84 hours), making it effective for sustained treatment.
How Does NBP Work?
NBP’s power lies in its multi-targeted mechanisms—addressing multiple steps in disease progression rather than just one. Two key actions stand out:
1. Reconstructing Microcirculation
The brain’s tiny blood vessels (“microcirculation”) are critical for delivering oxygen and nutrients. When these vessels are damaged (e.g., in stroke), blood flow drops, leading to cell death. NBP helps:
- Reduce platelet clumping: It inhibits platelets from sticking together (triggered by chemicals like arachidonic acid or ADP), lowering the risk of blood clots.
- Dilate blood vessels: It boosts levels of nitric oxide (NO) and prostaglandin I2 (PGI2)—natural vasodilators that widen blood vessels and improve flow.
- Promote new blood vessels: It increases vascular endothelial growth factor (VEGF), which helps grow new capillaries in damaged areas.
2. Protecting Mitochondria
Mitochondria are the brain’s “power plants”—producing energy (ATP) for cells. When mitochondria fail (e.g., in Alzheimer’s or stroke), cells starve and die. NBP:
- Stabilizes mitochondrial membranes: It prevents swelling and rupture, keeping energy production intact.
- Reduces oxidative stress: It lowers harmful reactive oxygen species (ROS) (think “cellular rust”) and boosts antioxidant enzymes like superoxide dismutase (SOD).
- Preserves energy metabolism: It maintains the activity of mitochondrial “respiratory chain complexes”—key for ATP production.
NBP in Neurological Diseases
NBP’s most well-studied use is for ischemic stroke (the leading cause of disability in China), but research suggests it could help many other conditions:
Ischemic Stroke: A Proven Adjunct
Stroke occurs when a blood clot blocks blood flow to the brain. NBP was approved for clinical use in China in 2002, and studies show:
- 74.7% efficacy: It improves recovery in stroke patients by reducing brain edema, preserving the blood-brain barrier, and inhibiting cell death.
- Low side effects: Adverse reactions are rare, making it safe for long-term use (e.g., 90-day treatment trials).
Alzheimer’s Disease: Protecting Synapses and Memory
Alzheimer’s (AD) is marked by synapse loss (connections between brain cells) and “tau tangles” (toxic protein clumps). NBP:
- Rescues synapses: It increases synaptophysin and PSD-95—proteins critical for synaptic health—in mice with AD-like pathology.
- Reduces tau damage: It lowers tau phosphorylation (a key step in tangle formation) and improves cognitive function in transgenic AD mice.
- Boosts neurogenesis: It stimulates brain stem cells to grow into new neurons, potentially replacing damaged cells.
Vascular Dementia: Restoring Blood Flow and Cognition
Vascular dementia (VaD) arises from reduced brain blood flow (e.g., from small vessel disease). NBP:
- Improves cognitive function: It increases BDNF (a “growth factor” for brain cells) and activates the Akt pathway—critical for neuron survival.
- Promotes angiogenesis: It grows new blood vessels in the hippocampus (the brain’s memory center), reversing hypoperfusion (low blood flow).
Parkinson’s Disease: Saving Dopaminergic Neurons
Parkinson’s (PD) involves the loss of dopamine-producing neurons in the substantia nigra. NBP:
- Protects dopaminergic cells: It increases tyrosine hydroxylase (TH)—an enzyme needed for dopamine synthesis—in rat models of PD.
- Reduces oxidative stress: It lowers malondialdehyde (MDA) (a marker of cell damage) and boosts antioxidant activity.
Brain Edema: Preserving the Blood-Brain Barrier
Brain edema (swelling) often follows stroke, trauma, or CO poisoning. NBP:
- Lowers BBB permeability: It reduces MMP-9 (an enzyme that breaks down the BBB) and increases TIMP-1 (its inhibitor), cutting swelling.
- Reduces ROS damage: It protects endothelial cells from oxidative stress, keeping the BBB intact.
Carbon Monoxide (CO) Poisoning: Restoring Cognitive Function
CO poisoning damages the brain by displacing oxygen in blood. NBP:
- Improves memory and attention: It reduces calpain 1 and CaMK II—proteins linked to cognitive decline—and preserves hippocampal structure.
- Enhances hyperbaric oxygen therapy: Combining NBP with hyperbaric oxygen boosts MMSE (cognitive) scores and lowers NIHSS (stroke) scores in patients.
Traumatic Central Nervous System Injury
Trauma to the brain or spinal cord damages the BBB and triggers inflammation. NBP:
- Protects the spinal cord: It inhibits endoplasmic reticulum stress (a type of cell damage) and preserves tight junction proteins (BBB structure).
- Reduces inflammation: It lowers pro-inflammatory cytokines like TNF-α and IL-1β in traumatic brain injury models.
Autoimmune Diseases
NBP shows promise for autoimmune conditions affecting the nervous system:
- Myositis: It improves muscle mitochondrial function and reduces inflammation in guinea pigs.
- Multiple Sclerosis: It suppresses necrosis (cell death) in microglia (brain immune cells) in mouse models of experimental autoimmune encephalomyelitis (EAE).
Amyotrophic Lateral Sclerosis (ALS): Slowings Motor Neuron Loss
ALS is a fatal disease of motor neurons (nerve cells controlling movement). NBP:
- Delays muscle atrophy: It reduces TNF-α and NF-κB (inflammatory proteins) and boosts Nrf2 (an antioxidant regulator) in ALS mice.
- Extends survival: It slows disease progression by protecting motor neurons.
Epilepsy: Balancing Excitation and Inhibition
Epilepsy involves overactive brain cells and mitochondrial dysfunction. NBP:
- Reduces seizures: It targets calcium-permeable AMPA receptors (overactive in epilepsy) and lowers epileptiform activity in rat models.
- Protects cognition: It preserves synaptic proteins (PSD-95, GAD65/67) and increases BDNF (a mood and memory factor) in epileptic mice.
NBP Beyond the Brain: Non-Neurological Uses
NBP’s benefits extend to other organs, thanks to its anti-oxidant and anti-inflammatory effects:
Diabetes: Reducing Oxidative Stress and Inflammation
Diabetes damages the brain, eyes, and blood vessels via ROS. NBP:
- Lowers inflammation: It reduces TNF-α, IL-1β, and IL-6 (pro-inflammatory cytokines) in diabetic rat brains.
- Protects neurons: It inhibits caspase-3 (a cell death enzyme) and boosts VEGF (blood vessel growth) in diabetic mice.
Diabetic Cataract: Preventing Lens Opacification
Diabetic cataracts form when ROS damage lens proteins. NBP:
- Delays cataract onset: It reduces ROS production and increases antioxidant enzymes (SOD, catalase) in rat models.
Atherosclerosis: Blocking Plaque Formation
Atherosclerosis (hardened arteries) is driven by inflammation and lipid buildup. NBP:
- Lowers lipids: It reduces blood cholesterol and triglycerides in ApoE-/- mice (a model of atherosclerosis).
- Reduces inflammation: It lowers VCAM-1 (a protein that attracts immune cells to blood vessels), slowing plaque growth.
Heart Health: Protecting Against Infarction and Remodeling
NBP benefits the heart by:
- Reducing apoptosis: It protects cardiomyocytes (heart cells) from death during ischemia-reperfusion (blood flow restoration after heart attack).
- Improving function: It prevents ventricular remodeling (heart enlargement) and arrhythmias (abnormal heartbeats) in post-heart attack rats.
Conclusion: A Promising Compound with Broad Potential
NBP’s journey from celery oil to a clinically approved stroke drug highlights its versatility. While most research is preclinical (animal studies) or early-phase clinical trials, its multi-targeted mechanisms make it a candidate for treating some of the most challenging neurological and non-neurological diseases.
The biggest questions remaining are:
- How exactly does NBP interact with human brain cells?
- Can it slow or reverse Alzheimer’s in large-scale clinical trials?
- What are its long-term effects in diverse patient populations?
But one thing is clear: NBP’s ability to address root causes of disease—like poor blood flow, mitochondrial failure, and oxidative stress—makes it a drug to watch. For patients with stroke, Alzheimer’s, or other conditions, it offers a glimmer of hope where few options exist.
Xi-Qian Chen, Ke Qiu, Hui Liu, Qiang He, Jia-Hui Bai, Wei Lu
Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
Original study published in Chinese Medical Journal (2019); doi.org/10.1097/CM9.0000000000000289
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