Somatostatin receptor subtype 4 modulates L-type calcium channels via Gβγ and PKC signaling in rat retinal ganglion cells
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Bibliographic record
Abstract
Somatostatin subtype-4 receptors (sst4) inhibit L-type calcium channel currents (ICa) in retinal ganglion cells (RGCs). Here we identify the signaling pathways involved in sst4 stimulation leading to suppression of ICa in RGCs. Whole cell patch clamp recordings were made on isolated immunopanned RGCs using barium as a charge carrier to isolate ICa. Application of the selective sst4 agonist, L-803 (10 nM), reduced ICa by 41.2%. Pretreatment of cells with pertussis toxin (Gi/o inhibitor) did not prevent the action of L-803, which reduced ICa by 34.7%. To determine the involvement of Gβγ subunits after sst4 activation, depolarizing pre-pulse facilitation paradigms were used to remove voltage-dependent inhibition of calcium channels. Pre-pulse facilitation did not reverse the inhibitory effects of L-803 on ICa (8.4 vs. 8.8% reductions, ctrl vs. L-803); however, pharmacologic inhibition of Gβγ reduced ICa suppression by L-803 (23.0%, P < 0.05). Inhibition of PKC (GF109203X; GFX) showed a concentration-dependent effect in preventing the action of L-803 on ICa (1 μM GFX, 34.3%; 5 μM GFX, 14.6%, P < 0.05). When both PKC and Gβγ were inhibited, the effects of L-803 on ICa were blocked (1.8%, P < 0.05). These results suggest that sst4 stimulation modulates RGC calcium channels via Gβγ and PKC activation. Since reducing intracellular Ca(2+) is known to be neuroprotective in RGCs, modulating these sst4 signaling pathways may provide insights to the discovery of unique therapeutic targets to reduce intracellular Ca(2+) levels in RGCs.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it