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Amino acids – treatment for chronic pain? Cheryl Chung, Jan 15, 2009
In the beginning…
Timeline ,[object Object],[object Object],[object Object],Sep 28, 1969 Murchison Meteorite Sep 28, 1969 Timeline
Timeline ,[object Object],[object Object],[object Object],Year 2006 MacLeod’s Lab Year 2006 Sep 28, 1969 Timeline
Why study amino acids? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Betz & Laube 2006
Isovaline & ACBC – analogues of glycine & GABA ,[object Object],[object Object],[object Object],[object Object]
Timeline ,[object Object],[object Object],[object Object],Present Project Goals Present Timeline Year 2006 Sep 28, 1969
Osteoarthritis (OA) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Experiments
3 part study ,[object Object],[object Object],[object Object]
1.  Maximum tolerated dose study
1.  Maximum tolerated dose ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
1.  MTD study – Method & Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
1.  MTD study - Results ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
1.  MTD study – An anecdote Rat 6, 2000mg/kg racemic isovaline
1.  MTD study - Mean arterial pressure
1.  MTD study - Heart rate
1.  MTD study - Breathing rate
2.  Dose ranging studies
2.  Dose ranging studies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
2.  DR Studies – Up & down method ,[object Object],( - ) ( - ) ( - ) ( + ) ( + ) ED50 Est. range of ED50 Dose 1 Dose 2 Dose 3 Dose 4 Dose 5
2.  DR studies - Formalin foot test -5   drug TIME (min) formalin 20 5 10 15 25 35 40 30 -20 Acclimatization
2.  DR studies - Results ,[object Object],[object Object],[object Object],Finding ED 50  for inhibition of phrase II formalin foot paw licking response using the “up and down” method
3.  Osteoarthritis Model
3.  Osteoarthritis model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
3.  OA model - Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
3.  OA model - Induction of osteoarthritis ,[object Object],[object Object],[object Object],[object Object]
OA Model – Objective evaluation of pain ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
3.  OA model - Incapacitance tester
OA model - Incapacitance tester
OA model – Allodynia test ,[object Object],[object Object],[object Object],[object Object],[object Object]
OA model – Tactile allodynia
OA model - Effects of conventional analgesics Fernihough  et al.  2004
OA model – Preliminary data ,[object Object],[object Object]
Take home messages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Acknowledgements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The Hugill Centre for Anaesthesia & Analgesia University Graduate Fellowship

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Amino acids -- treatment for chronic pain