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Fig. 4. GABA (10 nmol l–1–10 mmol l–1)
modulation of 3[H]-TBOB (t-butylbicycloorthobenzoate)
binding in the CIC of young and aged F344 rats. The dose–response curve
is shifted to the left. These data have functional implications since the aged
GABAA receptor must be more sensitive to GABA than the young
GABAA receptor for the channel to be open allowing TBOB to bind to
the picrotoxin binding site. (Modified from
Milbrandt et al., 1996.)