Table 4.
Glial cell responses to ATP ejection
| ATP concentration (μm) | Number of trials | Fraction of trials evoking response | ||
|---|---|---|---|---|
| Astrocyte Ca2+response | Müller cell Ca2+response | Intercellular Ca2+ wave | ||
| 0.1 | 9 | 0 | 0 | 0 |
| 0.3 | 10 | 0 | 0 | 0 |
| 1 | 19 | 0.74 | 0.84 | 0 |
| 3 | 20 | 1 | 1 | 1 |
| 10 | 10 | 1 | 1 | 1 |
ATP in Ringer's solution was pressure-ejected from a pipette onto the surface of the retina. Data are expressed as the fraction of trials that evoked a positive response: a Ca2+ increase within astrocytes (third column), a Ca2+ increase within Müller cells (fourth column), or a propagated intercellular Ca2+ wave (fifth column).