Table 1.
Developmental profile of P2Y receptor expression in the rat cochlea
| E16 | E18 | P0 | P6–12 | P20 | Adult | ||
|---|---|---|---|---|---|---|---|
| Organ of Corti | |||||||
| Sensory cells | Inner hair cells | – | – | Y2 (m); Y4 (s); Y6 (m); Y12 (s) | Y4 (s) | Y4 (s) | Y4 (m) |
| Outer hair cells | – | – | Y2 (m); Y4 (s); Y6 (m); Y12 (s) | Y1 (s); Y4 (s) | Y1 (s); Y4 (s); Y6 (m) | Y1 (s); Y4 (m) | |
| Synaptic region | – | – | Y2 (s) | – | Y4 (m) | Y4 (s) | |
| Greater epithelial ridge | – | Y2 (w); Y4 (m); Y6 (w) | Y2 (w); Y4 (s); Y6 (w) | Y4 (w) | – | – | |
| Cuticular plate | – | – | Y6 (s) | Y6 (s) | Y6 (m) | Y2 (s); Y6 (s) | |
| Tunnel crossing fibers | – | – | – | – | Y4 (s) | Y4 (s) | |
| Supporting cells | Deiters’ cells | – | – | – | Y2 (s) | – | – |
| Hensen's cells | – | – | – | Y2 (s) | – | – | |
| Pillar cells | – | – | – | Y2 (s) | Y2 (m); Y4 (m); Y6 (m) | Y2 (s); Y4 (w); Y6 (s) | |
| - Headplate | – | – | – | Y12 (m) | Y2 (m); Y6 (s) | Y2 (s); Y6 (s) | |
| - Footplate | – | – | – | – | Y2 (m); Y6 (m) | Y2 (s); Y6 (s) | |
| Claudius’ cells | – | – | Y2 (m) | Y2 (s) | Y2 (m) | Y2 (w) | |
| - Mesenchymal cells | – | – | – | – | – | Y1 (s) | |
| Phalangeal cells | – | – | – | Y4 (s) | – | – | |
| Stria vascularis | – | – | Y6 (m) | – | – | – | |
| Marginal cells | – | – | Y4 (s) | Y4 (s) | Y4 (m) | Y4 (m) | |
| Intermediate cells | – | – | – | – | – | Y4 (m) | |
| Basal cells | – | – | – | Y1 (s); Y2 (m–s); Y6 (m–s) | Y1 (w); Y2 (s); Y6 (s) | Y2 (s); Y6 (s) | |
| Spiral ligament | – | – | – | Y1 (m) | Y4 (m) | Y4 (m) | |
| Spiral prominence | – | – | – | – | Y4 (s) | Y4 (s) | |
| –Epithelial cells | – | – | – | Y2 (m) | Y2 (s) | Y2 (s) | |
| Outer Sulcus | – | – | – | Y2 (m) | Y2 (s) | Y2 (s) | |
| Spiral limbus | – | – | Y4 (m) | Y4 (m) | Y4 (m) | Y4 (m) | |
| –Interdental cells | – | – | Y6 (w) | Y1 (s); Y2 (m); Y6 (w) | Y1 (m); Y6 (m) | Y1 (w); Y6 (m) | |
| Reissner's membrane | –Epithelial cells | – | – | Y4 (s); Y6 (w) | Y1 (s); Y4 (s); Y6 (w); Y12 (m) | Y1 (s); Y4 (s); Y6 (w); Y12 (w) | Y1 (m); Y4 (m); Y6 (w); Y12 (w) |
| –Mesenchymal cells | – | – | – | Y12 (m) | Y12 (w) | Y12 (w) | |
| Spiral ganglion | Neurons | – | Y4 (w); Y12 (m) | Y4 (s); Y6 (m); Y12 (m) | Y1 (m); Y2 (m); Y4 (s); Y6 (m); Y12 (m) | Y1 (w); Y2 (m); Y4 (s); Y6 (m); Y12 (m) | Y1 (w); Y2 (w); Y4 (s); Y6 (w); Y12 (m) |
| Satellite cells | – | – | – | – | Y4 (s) | Y4 (s) | |
| Intraganglionic bundles | – | Y2 (s) | Y2 (s) | – | Y4 (s) | Y4 (m) |
w weak, m moderate, s strong