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Clinical Pharmacology
                      of Botulinum Toxin A
                                  Sunisa Sintuwong, M.D.
                          Mettapracharak (Wat Raikhing) Hospital




Sunday, August 26, 2012                                            1
• introduction
                    • synthesis and structure of Botulinum
                          neurotoxins
                    • mechanism of action
                    • clinical pharmacology


Sunday, August 26, 2012                                      2
introduction
                    • first used for treatment of strabismus and
                          blepharospasm (muscular overactivity)
                    • then use in facial aesthetics
                    • most popular non-surgical aesthetic
                          procedure in USA
                    • only BOTOX is currently approved for
                          cosmetic use in USA


Sunday, August 26, 2012                                           3
Synthesis and Structure
                               of Botulinum neurotoxins

                    • “proteins” produced by different clostridial
                          bacterial species
                    • related to tetanus toxin
                    • progenitor toxin and associated proteins
                    • different bacterial strains -> different
                          botulinum neurotoxin serotype (type
                          A,B,C1,D,E,F,G)


Sunday, August 26, 2012                                              4
• various serotypes form different complex
                          sizes
                    • only type A forming largest complex (900
                          kd)
                    • active neurotoxin 150 kd
                    • and cleaved in an active dichain: 100 kd
                          heavy chain and 50 kd light chain




Sunday, August 26, 2012                                          5
Mechanism of Action
                    • inhibition of acetylcholine release
                    • inhibit exocytosis of Ach at NMJ
                    • begins when BTX bind cholinergic receptor
                          on cholinergic nerve terminals
                    • BTX molecules internalized into the cell
                    • heavy and light chain separated
                    • light chains act as an enzyme: cleaving bond
                          of proteins needed for exocytosis of Ach
                          (SNARE)
Sunday, August 26, 2012                                              6
• SNARE (Soluble N-ethyl-maleimide-
                          sensitive factor attachment protein
                          receptor)
                    • inhibit Ach release then reduce muscular
                          contraction
                    • results in nerve sprout at NMJ and release
                          Ach (temporary)
                    • temporary and reversible
                    • needs repeated injection and dose and
                          injection site adjustment

Sunday, August 26, 2012                                            7
• multistep process: time lag btw exposure to
                          toxin and onset of muscle weakness
                    • also inhibit release of Ach of autonomic
                          terminals: Rx sialorrhea and primary
                          axillary hyperhidrosis
                    • Kozaki et al and Dong et al: identified
                          synaptotagmin protein with gangliosides
                          (GT1b) receptor for BTX type B and G


Sunday, August 26, 2012                                             8
Clinical Pharmacology

                    • Unit Doses
                    • units of biologic activity (U)
                    • doses not standardized among different
                          BTX products




Sunday, August 26, 2012                                        9
Time Course of Clinical
                       Effects

                    • BTX type A injected IM
                    • onset 3-7 days
                    • duration 3-5 months


Sunday, August 26, 2012                        10
Clinical Adverse Events


                    • most focal muscle weakness
                    • systemic side effects: rare (BOTOX
                          information)




Sunday, August 26, 2012                                    11

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Clinical Pharmmacology of Botulinum Toxic A

  • 1. Clinical Pharmacology of Botulinum Toxin A Sunisa Sintuwong, M.D. Mettapracharak (Wat Raikhing) Hospital Sunday, August 26, 2012 1
  • 2. • introduction • synthesis and structure of Botulinum neurotoxins • mechanism of action • clinical pharmacology Sunday, August 26, 2012 2
  • 3. introduction • first used for treatment of strabismus and blepharospasm (muscular overactivity) • then use in facial aesthetics • most popular non-surgical aesthetic procedure in USA • only BOTOX is currently approved for cosmetic use in USA Sunday, August 26, 2012 3
  • 4. Synthesis and Structure of Botulinum neurotoxins • “proteins” produced by different clostridial bacterial species • related to tetanus toxin • progenitor toxin and associated proteins • different bacterial strains -> different botulinum neurotoxin serotype (type A,B,C1,D,E,F,G) Sunday, August 26, 2012 4
  • 5. • various serotypes form different complex sizes • only type A forming largest complex (900 kd) • active neurotoxin 150 kd • and cleaved in an active dichain: 100 kd heavy chain and 50 kd light chain Sunday, August 26, 2012 5
  • 6. Mechanism of Action • inhibition of acetylcholine release • inhibit exocytosis of Ach at NMJ • begins when BTX bind cholinergic receptor on cholinergic nerve terminals • BTX molecules internalized into the cell • heavy and light chain separated • light chains act as an enzyme: cleaving bond of proteins needed for exocytosis of Ach (SNARE) Sunday, August 26, 2012 6
  • 7. • SNARE (Soluble N-ethyl-maleimide- sensitive factor attachment protein receptor) • inhibit Ach release then reduce muscular contraction • results in nerve sprout at NMJ and release Ach (temporary) • temporary and reversible • needs repeated injection and dose and injection site adjustment Sunday, August 26, 2012 7
  • 8. • multistep process: time lag btw exposure to toxin and onset of muscle weakness • also inhibit release of Ach of autonomic terminals: Rx sialorrhea and primary axillary hyperhidrosis • Kozaki et al and Dong et al: identified synaptotagmin protein with gangliosides (GT1b) receptor for BTX type B and G Sunday, August 26, 2012 8
  • 9. Clinical Pharmacology • Unit Doses • units of biologic activity (U) • doses not standardized among different BTX products Sunday, August 26, 2012 9
  • 10. Time Course of Clinical Effects • BTX type A injected IM • onset 3-7 days • duration 3-5 months Sunday, August 26, 2012 10
  • 11. Clinical Adverse Events • most focal muscle weakness • systemic side effects: rare (BOTOX information) Sunday, August 26, 2012 11