Fig. 3. Interactions between Shh and Ptc1 at primary cilia. (A) Colocalization of Shh and Ptc1 at the cilium shown in a confocal image of a live ptc1^–/– cell transfected with Ptc1-YFP (green) and incubated with ShhN-A594 (red, 300 ng/ml) for 45 min. Inversin-CFP (cyan) marks the cilium, the dotted line demarcates the cell border, and insets show magnified views of the cilia. (B) Mean Ptc1 fluorescence in cilia of NIH 3T3 cells treated with SAG (100 nM), Shh, or both. (C) Disappearance of Ptc1 from primary cilia after Shh treatment. NIH 3T3 cells preincubated with SAG for 24 hours were switched to control medium (untreated) or into Shh-containing medium. The red dashed baseline shows the amount of ciliary Ptc1 in cells treated with Shh for 4 hours without a 24-hour SAG pulse. [View Larger Version of this Image (143K JPEG file)]

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