Sensitisation and receptors

[John H.]

I'm trying to find some key articles on how receptors alter when subjected
to large amounts of a neurotransmitter or vice versa. ie. becomes highly
sensitised when the transmitter is deficient or less sensitive when in
abundance. Can anyone point me to some good sources re this. Web pages okay
but prefer journal articles if possible. Better still if someone can share
their own ideas on this. Promise I'll try and respond; intelligently.

John H.