The Action of Botox on Migraine
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Using BOTOX ® as an adjunct in the treatment for MIGRAINE
by Dr. Patrick Treacy
Medical DirectorAilesbury Clinics
Ireland
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Migraine Association of Ireland
1. The history of the development of Botox ®2. What exactly is Botox ® and how does it work?
3. What are the current uses of Botox in medicine? 4. How exactly does Botox works for migraine?5. What is the evidence for the use of Botox ®?
6. What are the possible side effects of Botox ®?
Lecture will cover
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WHAT EXACTLY IS BOTOX ®?
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History of Botox starts in the new century 1900
History of Botox starts in the new century 1900
German chemical warfare brought new means of killing people
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Ypres April 22nd 1915 Ypres April 22nd 1915
Non specific method. 5,000 British troops died on the first day and 5,000 Germans on the second
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Next year Ireland strikes for freedom. Dublin 1916
Next year Ireland strikes for freedom. Dublin 1916
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1916 British built a new chemical warfare complex
1916 British built a new chemical warfare complex
7000 acres of scrubland in Porton Down Wiltshire
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Porton Down Research Centre
Porton Down Research Centre
Research experiments on Botulinum by scientist Dr. Paul Fides gave rise to DysPORT
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Clostridium botulinumClostridium botulinum
Anaerobic, Gram-positive, rod-shaped, spore-forming organism
Found in soil samples and aquatic sediments
Produces the neurotoxin botulin
Recognized in 1896 by Emile van Ermengen
Anaerobic, Gram-positive, rod-shaped, spore-forming organism
Found in soil samples and aquatic sediments
Produces the neurotoxin botulin
Recognized in 1896 by Emile van Ermengen
10
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Porton Down is still active today
Porton Down is still active today
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First victim of experimentsFirst victim of experiments
Aircraftman Ronald Madison died in May 1953
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Reinhard Heydrich Reinhard Heydrich
Assassinated by Czech agents in Prague on 27th May 1942 by use of Botulinum toxin
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1953 US built chemical warfare plant at Fort Detrick
1953 US built chemical warfare plant at Fort Detrick
American experiments by Edward Schantz gave rise to Botox
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Botox ResearchBotox Research
Edward J. Schantz purified toxins from C. botulinum, S. aureus, B. cereus, and shellfish
Dr. Alan Scott, was specializing in strabismus (cross-eye) looking to weaken overactive eye muscles
Schantz gave Scott preparations
of the botulinum toxin (BTX-A)
Edward J. Schantz purified toxins from C. botulinum, S. aureus, B. cereus, and shellfish
Dr. Alan Scott, was specializing in strabismus (cross-eye) looking to weaken overactive eye muscles
Schantz gave Scott preparations
of the botulinum toxin (BTX-A) 15
Edward J. Schantz 1908-2005
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StrabismusStrabismus
16
The various muscles of the eye that might be affected by strabismus.
Demonstration of the various inflictions of strabismus
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How did Botox reach such popularity?
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The use of BOTOX cosmetically
Pictures courtesy of Ailesbury Clinics
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Same patient 5 days later
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When did Botox become so popular?
1987 Canadian ophthalmologist Jean Carruthers noted that frown lines disappeared following the
use of Botox to treat patients for blepharospasm.
She told her dermatologist husband Dr. Alastair Carruthers
1990, The Carruthers published their findings
“The treatment of glabellar furrows with Botulinum-A exotoxin”
Carruthers JDA, Carruthers JA. J Dermatol Surg Oncol. 1990;
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Botox and Cosmetic Medicine
1991 Carruthers presented their findings at the American Society for
Dermatologic Surgery, Florida
1992 Carruthers article in J Dermatol Surg Oncol.1992;18:17-21 made the FDA approve
Botox for use in cosmetic medicine.
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Botox and Headaches
1992 The headache and Botox connection began emerging in 1992 when a California physician noted his patients who got Botox
injections said they were having fewer headaches.
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Where does Botox come from?
Botulinum toxin (BTX) is produced by a bacterium called Clostridium botulinum,
The clinical syndrome of botulism can occur following ingestion of contaminated food from this bacterium
Botulinum toxin is broken into 7 neurotoxins (types A, B, C [C1, C2], D, E, F, and G), which are distinct but structurally similar.
Human botulism is mainly due to types A, B, E, and, rarely, F,G.
Types C and D cause toxicity only in animals.
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What does the Botox look like?
Botox is a single chain that can split to form a dichain molecule with a disulfide
bridge.
The light chain is similar to tetanus toxin
The heavy chain can bind the toxin to nerve receptors
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Scientific History of Botox
1822 German doctor Justinus Kerner published symptoms of "sausage poison" in 200 cases of
gastroenteritis in Stuttgart in medical journal . He suggested the idea of a possible therapeutic use of
“sausage poison“ in St. Vitus dance
1870, German doctor Muller coined the name botulism for the symptoms. Botulus is Latin for sausage.
1895, Microbiologist Prof. Emile Van Ermengem checked 3 deaths from food poisoning outbreak in
Ellezelles and isolated the bacterium Clostridium botulinum.
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20th century History of BTX-A toxin
•1944, Edward Schantz cultured Clostridium botulinum and isolated the toxin (BTX-A) .
•1949, Burgen et al discovered that botulinum toxin blocks neuromuscular transmission.
.
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FDA approval for Botox
•1973, Alan B Scott, MD, of Smith-Kettlewell Eye Research Institute used (BTX-A) in monkey
experiments
•1980, Scott suggested and used BTX-A for the first time in humans to treat strabismus.
•I989, BTX-A approved by the FDA for treatment of strabismus, blepharospasm, and hemifacial spasm in
patients aged younger than 12 years.
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FDA approved uses of BTX-A
1. Cervical dystonia2. Blepharospasm
3. Cranial nerve 11 disorders4. Facial spasm
5. Glabellar frown lines
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‘Extralabel’ use of BTX-A
•Spasticity •Stroke •Traumatic brain injury •Cerebral palsy •Multiple sclerosis •Spinal cord injury
Achalasia (oesophageal) Chronic anal fissures Migraine and tension headaches Hyperhidrosis Cerebral Palsy Low back pain Myofascial pain syndrome Tics Spastic bladder and urinary sphincters
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‘Extralabel’ use of BTX-A
•Focal dystonias - Involuntary, sustained, or spasmodic patterned muscle activity •Cervical dystonia (spasmodic torticollis) •Blepharospasm (eyelid closure) •Laryngeal dystonia (spasmodic dysphonia) •Limb dystonia (writer's cramp) •Oromandibular dystonia •Orolingual dystonia •Truncal dystonia
•Sweating disorders •Axillary and palmar hyperhidrosis •Frey syndrome, also known as auriculotemporal syndrome
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‘Extralabel’ use of BTX-A
•Disorders of localized muscle spasms and pain •Chronic low back pain •Myofascial pain syndrome •Temporomandibular joint disorders •Tension headache •Migraine headache •Cervicogenic headache
Smooth muscle hyperactive disorders • Detrusor-sphincter dyssynergia • Achalasia cardia • Hirschsprung disease • Sphincter of Oddi dysfunctions • Chronic anal fissures
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How does Botox work?
At a normal neuromuscular junction, a nerve impulse
triggers the release of acetylcholine, which
causes the muscles to contract.
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How does Botox work?
Botox acts by binding to receptor sites on the nerve
terminals blocking the release of ACETYLCHOLINE
This mechanism laid the foundation for the development
of the toxin as a therapeutic tool.
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Mechanism of BLOCKING of BTX-A
The Botox light chain stops ACETYLCHOLINE release by
cleaving a protein called SNAP-2
SNAP-2 is required for the docking of acetylcholine
vesicles on the inner side of the nerve terminal plasma
membrane.
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Where does BOTOX® Block Ach?Where does BOTOX® Block Ach?
Skeletal Muscle
Arms Legs Face Neck
Skeletal Muscle
Arms Legs Face Neck
Motor NerveAlpha/Gamma
This use in stroke and cerebral palsy
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Where else does BOTOX® block Ach release?Where else does BOTOX® block Ach release?
Autonomic Nerves
Secretory glands Sweat glands Salivary glands
Smooth muscle Bladder Diaphragm
Autonomic Nerves
Secretory glands Sweat glands Salivary glands
Smooth muscle Bladder Diaphragm
Hyperhidrosis Sialorrhea
Autonomic Nerves
Smooth MuscleBladder
This use in sweating and incontinence
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Why does Botox stop working?
Clinical effect lasts about 2-6 months and then
resolve
Recovery occurs through formation of new nerve
terminals
Study by De Paiva suggests that regeneration
of the original neuromuscular junction
can take place.
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The Migraine Story
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Triggers and Risk FactorsTriggers and Risk Factors
Migraine headaches are often triggered by specific things
Migraine headaches are often triggered by specific things
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Triggers: Changes in Daily CyclesTriggers: Changes in Daily Cycles
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Triggers: Environment or DietTriggers: Environment or Diet
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Triggers: MentalTriggers: Mental
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In the past 3 months in the US alone...
9 million
14 million
21 million
18 million
16 million Missed family or leisure activity
Functioned less than half as well at household chores
Were unable to do chores/household work
Functioned less than half as well at work/school
Missed Work or School
Migraine Takes Time Out From Your Life
Migraine Takes Time Out From Your Life
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How Migraine Stacks Up Against Other Common
Diseases
How Migraine Stacks Up Against Other Common
Diseases
From the Centers for Disease Control and Prevention, the US Census Bureau, and the Arthritis Foundation.
1%
5%6%
7%
12%
Rheumatoid arthritis
Asthma Diabetes Osteoarthritis Migraine
Affected Patients
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The Stages of a Migraine AttackThe Stages of a Migraine Attack
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Migraine Unnecessary SufferingMigraine Unnecessary Suffering
More than 50% of people with migraine suffer for at least a year before they
are properly diagnosed
About 38% of people with migraine suffer for about 3 or more years before they are properly diagnosed
More than 50% of people with migraine suffer for at least a year before they
are properly diagnosed
About 38% of people with migraine suffer for about 3 or more years before they are properly diagnosed
National Headache Foundation. American Migraine Study II: Migraine in the United States: `Burden of Illness and Patterns of Treatment
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1Migraine originates deep
within the brain
2Electrical impulses
spread to other regions of the brain.
3Changes in nerve cell activity and blood flow
may result in visual disturbance,
numbness or tingling, and dizziness.
4Chemicals in the brain cause blood vessel
dilation and inflammation of the surrounding tissue
5The inflammation irritates
the trigeminal nerve, resulting in severe or
throbbing pain
How do Migraines happen?How do Migraines happen?
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Chemicals irritate Trigeminal Nerve Chemicals irritate Trigeminal Nerve
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This triggers other nervesThis triggers other nerves
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Arterial Activation
Release of Neurotransmitter
Worsening of Pain
How does Botox help?
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Botox blocks these neurotransmittersBotox blocks these neurotransmitters
cGRP
Sub P
Glut
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Motor NerveAlpha/Gamma
Sensory NerveType C, A-delta, A-
Beta
SP, cGRP, Glu
Autonomic Cholinergic
Smooth Muscle
SNARE
BOTOX
AchAch
The blocking effects of BOTOXThe blocking effects of BOTOX
* BTX/A→SNAP-25; BTX/B →VAMP
SNARE complexSingle site of action = SNARE
protein via SNAP-25
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Sub-PcGRP
BkK+
His
Sub-PcGRP
How Botox into Muscle stops Headache Pain How Botox into Muscle stops Headache Pain
BTX
Central Sensitization
Central Sensitization: An increase in responsiveness
of neurons within CNS
Peripheral Sensitization:
-Increase in excitability of
peripheral nociceptors
Response to Stimulus
VESICULAR release of mediators stimulate
nociceptors
Antidromic Stimulation
Neurogenic Inflammation:
Dilation of arterioles, leakage of
plasma from venules (edema)
Chronic Inflammation
and Pain:Wind-up
Feedback loop
Proposed Effects of BTXDirect inhibition of inflammatory
mediators`
Peripheral Sensitization
Antidromic Stimulation:
AP’s travel both centrally, and peripherally,
invading branches of the same neuron
outside the area of injury
Vesicle mediated release
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How does Botox stop Migraine?
How does Botox stop Migraine?
It is not really clear how Botox curbs headache pain and stiffness. Researchers think Botox blocks sensory nerves that relay pain messages to the brain and relaxes muscles, making them less sensitive to pain.
It is not really clear how Botox curbs headache pain and stiffness. Researchers think Botox blocks sensory nerves that relay pain messages to the brain and relaxes muscles, making them less sensitive to pain.
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Sensory ganglion
Motor Neuron
Nerves
Spinal cordSensory neuron
Interneuron
Brain
Sensory Input
Motor Output
Sensory ganglion
Motor Neuron
Nerves
Spinal cordSensory neuron
Interneuron
Brain
Sensory Input
Motor Output
Sensory ganglion
Motor Neuron
Nerves
Spinal cordSensory neuron
Interneuron
Brain
Sensory Input
Motor Output
Sensory ganglion
Motor Neuron
Nerves
Spinal cordSensory neuron
Interneuron
Brain
Sensory Input
Motor Output
Sensory ganglion
Motor Neuron
Nerves
Spinal cordSensory neuron
Interneuron
Brain
Sensory Input
Motor Output
Sensory ganglion
Motor Neuron
Nerves
Spinal cordSensory neuron
Interneuron
Brain
Sensory Input
Motor Output
Sensory ganglion
Motor Neuron
Nerves
Spinal cordSensory neuron
Interneuron
Brain
Sensory Input
Motor Output
Sensory ganglion
Motor Neuron
Nerves
Spinal cordSensory neuron
Interneuron
Brain
Sensory Input
Motor Output
How Botox injection blocks painHow Botox injection blocks pain
BoNT
BOTOX®
Blocks Sensory Input to CNS
Reduces Input to Muscle Spindle
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The Scientific Proof
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Dose response of cGRP released from stimulated TG cellsStimulated changes in cGRP secretion in TG cells
Without Botox KCl, IFC or Cap stimulus 4-5 fold increase in cGRP
released
Without Botox KCl, IFC or Cap stimulus 4-5 fold increase in cGRP
released
With Botox Inhibited cGRP KCl-
stimulated release
With Botox Inhibited cGRP KCl-
stimulated release
Durham 2003: Inhibition of cGRP chemical
release from Trigeminal nerve cells
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Mayo Clinic Study in Scottsdale, Arizona Mayo Clinic Study in Scottsdale, Arizona
David W. Dodick, M.D., April 14, 2005
Observations
More than half of the 48 patients said their migraine occurrences dropped by 50 percent or more.
61 percent said they had headaches less frequently and almost 30 percent said the headaches were less severe.
Conclusion “BTX-A significantly reduces frequency of headache attacks
in migraine patients suffering from chronic daily headaches (CHD).”
David W. Dodick, M.D., April 14, 2005
Observations
More than half of the 48 patients said their migraine occurrences dropped by 50 percent or more.
61 percent said they had headaches less frequently and almost 30 percent said the headaches were less severe.
Conclusion “BTX-A significantly reduces frequency of headache attacks
in migraine patients suffering from chronic daily headaches (CHD).”
Dodick D.W J Neurol 2005; 9:188
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Baylor College of Medicine Headache Clinic
Baylor College of Medicine Headache Clinic
58 patients participated in a controlled trial. Some got Botox and others water injections.
At 3 months, 55% of patients who received Botox reported at least moderate improvement in their headaches.
2 of the 29 (7%) who got the placebo water injections
reported similar results.
58 patients participated in a controlled trial. Some got Botox and others water injections.
At 3 months, 55% of patients who received Botox reported at least moderate improvement in their headaches.
2 of the 29 (7%) who got the placebo water injections
reported similar results.Dr. William Ondo
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Baylor College Trial Baylor College Trial
"The biggest advantage to Botox is its lack of side effects, especially compared to other medications," Dr. William Ondo of the Baylor College of Medicine said in an AHS press release. "It really is extremely safe and appears to be very effective for some people."
"The biggest advantage to Botox is its lack of side effects, especially compared to other medications," Dr. William Ondo of the Baylor College of Medicine said in an AHS press release. "It really is extremely safe and appears to be very effective for some people."
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Thomas Jefferson School of Medicine Study
Thomas Jefferson School of Medicine Study
Compared with subjects who received placebo inj. subjects in the Botox treatment group
experienced:
Significantly fewer migraine attacks per month
Reduced severity of migraine attacks Fewer days using abortive/rescue medications
Fewer episodes of vomiting
Compared with subjects who received placebo inj. subjects in the Botox treatment group
experienced:
Significantly fewer migraine attacks per month
Reduced severity of migraine attacks Fewer days using abortive/rescue medications
Fewer episodes of vomiting Silberstein, Mathew, Saper, and Jenkins. "Botulinum Toxin Type A as a Migraine Preventive Treatment .
" Headache: The Journal of Head and Face Pain 40 (6), 445-450 December 2003
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Allergan FDA studies Allergan FDA studies
Allergan Inc completed several exploratory Phase II clinical trials investigating the potential use of BOTOX to treat various forms of headache and levels of headache severity in an effort to identify a responsive patient population, dose and efficacy endpoints to guide its Phase III program.
Allergan Inc completed several exploratory Phase II clinical trials investigating the potential use of BOTOX to treat various forms of headache and levels of headache severity in an effort to identify a responsive patient population, dose and efficacy endpoints to guide its Phase III program.
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Allergan FDA resultsAllergan FDA results
Significant differences in favour of BOTOX were demonstrated on measures such as decrease in the frequency of headache episodes; decrease of at least 50% in headache days; and decrease in acute medication use.
Significant differences in favour of BOTOX were demonstrated on measures such as decrease in the frequency of headache episodes; decrease of at least 50% in headache days; and decrease in acute medication use.
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FDA trials FDA trials
Based on the Phase II findings specific to patients with CDH, Allergan reached an agreement with the FDA to move forward with a large Phase III clinical trial program
No significant between-group differences were observed on predetermined outcome measures
BOTOX is not currently approved by the FDA for the treatment of any headache disorder.
Based on the Phase II findings specific to patients with CDH, Allergan reached an agreement with the FDA to move forward with a large Phase III clinical trial program
No significant between-group differences were observed on predetermined outcome measures
BOTOX is not currently approved by the FDA for the treatment of any headache disorder.
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Migraine Injection PointsMigraine Injection Points
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Any side effects of Botox?
Flulike syndrome has been reported, generally short-lived. Other s/e muscle soreness, headaches, light-headedness, fever, chills, hypertension, weakness, diarrhoea, and abdominal pain are not necessarily a result of BTX-A treatment. They include .
Since the mechanism of action of BTX-A is so specific, side effects are uncommon and systemic effects rare.
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What about the famous droopy eyelids?
Patient with eyelid ptosis
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ANATOMY OF FOREHEAD MUSCLES
FRONTALIS
Action: Elevates eyebrows and the skin of the forehead
Action: Elevates eyebrows and the skin of the forehead
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ANATOMY OF FOREHEAD MUSCLES
CORRUGATOR SUPERCILII
Action: Depresses eyebrows and wrinkles forehead
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ANATOMY OF FOREHEAD MUSCLES
ORBICULARIS OCULI
Action:Depresses eyebrows Closes the eyelidsHelps drainage of tears
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REMEMBER final brow position is a balance between DEPRESSORS and ELEVATOR
PROCERUS MUSCLECORRUGATOR MUSCLEORBICULARIS OCULI
FRONTALIS FINAL BALANCE DEPENDS ON SKILL OF DOCTOR
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Contraindications to Botox injections
Treat patients with diseases of the
neuromuscular junction (eg, myasthenia gravis)
cautiously because underlying generalized
weakness can be exacerbated, and local
weakness at injection sites can occur more than otherwise expected
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IF YOU DO NOT KNOW WHAT YOU ARE DOING YOU PAY THE PRICE
NOW! HOW DO I GET BACK UP?
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THE MIGRAINE INJECTION POINTS
INJECT ONLY CORRUGATOR, PROCERUS AND
FRONTALIS MUSCLES
DANGER: AVOID INJECTING 1CM ABOVE MID-PUPILLARY LINE
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BOTULINUM-A TOXIN formulations
Botox® is an American form of BTX-A produced from the Hall strain of C botulinum
Botox ® is distributed by Allergan Inc. Headquarters Irvine California
Manufactured Westport Co. Mayo
BOTOX ®
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BOTULINUM-A TOXIN formulations
Dysport ® is a British form of BTX-A made in England and mostly available in Europe.
Dysport ® is produced by Speywood Pharmaceuticals in England (Dysport)
DYSPORT ®
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BOTULINUM-A TOXIN formulations
Myobloc™ is BTX-B (botulinum toxin type B) is also used to treat facial wrinkles. FDA approved for the use of cervical dystonia in Dec 2000
Myobloc™ is distributed by Elan Pharmaceuticals in Athlone, Ireland
MYOBLOC ®
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Peripheral Sensitization Leads to Central Sensitization
Peripheral Sensitization Leads to Central Sensitization
Peripheral Stimulation
Release of Glutamate and Peptides in CNS
Release of Neuropeptides
Peripheral SensitizationIncreased afferent signals
Lack of sensitivity of nerve endings
Antidromic Activation
CNS
Central Sensitization
Central Sensitization
Additional Activation
Decreased Inhibition at the dorsal horn
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Botulinum Toxin May Prevent Peripheral Sensitization and Central Sensitization
Botulinum Toxin May Prevent Peripheral Sensitization and Central Sensitization
Peripheral Stimulation
Release of Glutamate and Peptides in CNS
No peripheral release
Prevents Peripheral Sensitization:
•Inhibits release of neuropeptides
Antidromic Activation
CNSBotulinum Toxin
May Indirectly Prevent:
•Central Sensitization
Clinical relevance of these preclinical results remain to be established
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PNS CNSPeripheral SensitizationGlu, Sp, cGRP, NA, NGF
BK, PGs, HA, 5-HT, H+
Adenosine, NO
Central Sensitization
GluSp
C-fiber/ A delta
A fiber Spinal Cord or Nucleus Trigeminal Caudalis
DRG or TGG
Impulses
IncreaseWDR
Peripheral Sensitization, leading to Central Sensitization
C-fos
Translating these Mechanisms to Humans
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Peripheral Sensitization
Glu, Sp, cGRP, NA, NGFBK, PGs, HA, 5-HT, H+
Adenosine, NO
Central Sensitization
GluSp
C-fiber/A delta
A fiber
Impulses
BTX/A
PNS CNS
IncreaseWDR
Spinal Cord or Nucleus Trigeminal CaudalisDRG or TGG
BTX/A inhibits release of mediators at the peripheral pain fibres, resulting in an indirect effect on the CNS
Blocking Headaches with Botox