Eicosanoid synthesis
from fatty acid precursors like arachidonic acid or other 20 Carbon chains
Prostanoids types
prostaglandins
thromboxanes
leukotrienes
type of eicosanoid
Lipooxygenases
produce leukotrienes from arachidonic acid
COX 2
inducible from of COX found on immune cells
epoxygenases /P450
enzymes that produce epoxyeicosatrienoic acids from arachidonic acid
PGH2
Common prostaglandin from COX enzymes that differentiates to other forms
PGI2
Prostacyclin
-main anti clotting factor in body produced by endothelial cells
-vaso dilator
TXA2
Thromboxane
-produced in platelets it’s a pro clotting factor and vasoconstrictor
PGD2
prostanoid
-vasodilation
-inhibits clotting
-relaxes GI/Uterus
PGE2
Main inflammatory prostanoid
-vasodilation
-pyrogenic
-lung and GI SM effects (receptor dependant)
PGF2 alpha
Prostanoid
-uterine contraction
LTB4
leukotriene receptor
-pro inflammatory
-chemotaxis
-proliferation
-cytokine production
CysLT
leukotriene receptor
-contracts bronchial muscle
-vasodilation
-coronary constriction
THC subjective effects
-Relaxation
-sharpened senses
-psychoimetic effects
THC Objective effects
-Impaired memory
-imparied motor control
-catalepsy
-analgesia
-antiemetic
-increase appetite
THC peripheral effects
-Vasodilation (in eye, blood shot)
-decrease eye pressure
-bronchodilation
CB1 receptor
Gi/o linked causing hyperpolization (inhibit Ca2+, activate K+ channels)
-Pre synaptic and prevent NT release
-found in endothelial cells, adipocytes, peripheral fevers
CB2 receptor
Gi/o linked
found on immune cells
Endocannabionoid action
act as retrograde transmitters to stop activation (released from post synaptic neuron acting on pre synaptic CB1 receptors)