Fig. 7.
Concentration-response curves for the stimulation of intracellular cAMP accumulation by CRF in HEK293 cells expressing full-length wild-type and mutant CRF1 receptors. cAMP levels (pmol/well) were measured in quadruplicate in HEK293 cells transfected with cDNAs for full-length wild-type (WT), Δ412, or Δ386 CRF1 receptors and then stimulated with CRF (0–1,000 nM). See Table 1 for EC50 and maximum response values for cAMP signaling in HEK293 cells expressing the three CRF1 receptor constructs.