Dendritic spines form the postsynaptic contact sites for most excitatory sy
napses in the brain. Spines occur in a wide range of different shapes that
can vary depending on an animal's experience or behavioral status. Recently
we showed that spines on living neurons can change shape within seconds in
a process that depends on actin polymerization. We have now found that thi
s morphological plasticity is blocked by inhalational anesthetics at concen
trations at which they are clinically effective. These volatile compounds a
lso block actin-based motility in fibroblasts, indicating that their action
is independent of neuron-specific components and thus identifying the acti
n cytoskeleton as a general cellular target of anesthetic action. These obs
ervations imply that inhibition of actin dynamics at brain synapses occurs
during general anesthesia and that inhalational anesthetics are capable of
influencing the morphological plasticity of excitatory synapses in the brai
n.