Volume 27, Issue 1, Pages (January 2017)

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Volume 27, Issue 1, Pages 39-47 (January 2017) Optogenetic Stimulation of Frontal D1 Neurons Compensates for Impaired Temporal Control of Action in Dopamine-Depleted Mice  Young-Cho Kim, Sang-Woo Han, Stephanie L. Alberico, Rafael N. Ruggiero, Benjamin De Corte, Kuan-Hua Chen, Nandakumar S. Narayanan  Current Biology  Volume 27, Issue 1, Pages 39-47 (January 2017) DOI: 10.1016/j.cub.2016.11.029 Copyright © 2017 Elsevier Ltd Terms and Conditions

Current Biology 2017 27, 39-47DOI: (10.1016/j.cub.2016.11.029) Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 1 Interval Timing and Medial Frontal Delta Rhythms in Humans and Rodents Are Attenuated with Disrupted Midbrain Dopamine (A) Interval timing requires participants to estimate an interval of several seconds (12 s) by making a motor response as instructed by a cue; early responses are unreinforced. This task requires working memory for temporal rules and attention to time. (B) Humans with PD have broader and earlier time-response histograms compared to demographically matched controls (12 controls and 12 PD patients). (C) Interval-timing behavior can be operationalized by using the efficiency of responses or the curvature of time-response histograms. PD patients are less efficient and have flatter time-response histograms compared to demographically matched controls. (D–F) Time-frequency analysis of EEG electrode Cz during interval-timing tasks in controls (D) and PD patients (E) revealed that delta rhythms between 1–4 Hz (F) are attenuated in PD patients compared to controls. (G) Topographic distribution of delta power over the MFC in controls and PD patients; power same as in (D). White dot in (G) corresponds to electrode Cz. (H) In mice, mesocortical dopamine can be depleted using 6OHDA injections; we targeted bilateral mesocortical projections in the VTA. Representative images from animal with VTA-6OHDA (left) versus a different animal with vehicle (right) stained for tyrosine hydroxylase (green). (I) In mice, interval timing is impaired in VTA-6OHDA compared to VTA-vehicle mice. (J) VTA-6OHDA mice were less efficient in interval timing and had flatter time-response histograms compared to VTA-vehicle. (K and L) Time-frequency analysis of LFP power from mouse MFC during interval timing in control (K) and VTA-6OHDA (L) mice. (M) Mice with VTA-6OHDA have less delta power in MFC LFPs compared to control mice. EEG from 12 PD patients/12 controls, 6 VTA-vehicle/6 VTA mice. ∗p < 0.05. See also Figures S1–S3 and Table S1. Current Biology 2017 27, 39-47DOI: (10.1016/j.cub.2016.11.029) Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 2 Optogenetic Tagging of Putative MFC D1DR-Expressing Neurons (A) Schematic of multichannel electrode recording of MFC D1DR neurons with optical fiber. (B) Expression of D1DR-Cre-dependent ChR2-mCherry from dorsal MFC (left). Immunohistochemistry with anti-Cre and anti-D1DR demonstrated expression of Cre recombinase in D1DR neurons (top right). Immunohistochemistry with anti-Cre confirmed Cre-dependent expression of ChR2-mCherry (bottom right). Scale bar, 20 μm. (C) A raster plot of a neuron with spikes evoked blue light (blue bar). Representative example of average spike waveforms compared between light-evoked and spontaneous activity. Pearson correlation coefficient >0.95 indicated that light-evoked and non-light evoked spikes were the same; note that during optogenetic tagging stimulation, animals were not engaged in the task and typically not moving. The timescale is shown in milliseconds to show evoked activity. (D) Properties of light-evoked waveforms. Light-evoked spike latencies and jitter of 30 putative MFC D1DR neurons (waveform correlation: 0.998 ± 0.0015. spike latency: 1.84 ± 0.098 ms; spike jitter: 1.1 ± 0.05 ms; green dots from each putative MFC D1DR neuron). Boxplot central bar represents the median, and edges represent the 25th and 75th percentiles of the dataset. Current Biology 2017 27, 39-47DOI: (10.1016/j.cub.2016.11.029) Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 3 MFC D1DR Neurons Are Involved in Temporal Processing (A) Peri-event raster and histogram of a putative MFC D1DR neuron during the 12-s interval during interval timing (red). (B) Peri-event raster and histogram of an untagged MFC neuron during the 12-s interval (blue). (C) Normalized average activity (Z score) of 30 optogenetically tagged putative MFC D1DR neurons (red) and 176 untagged MFC (blue) neurons during the 12-s interval; putative MFC D1DR neurons had stronger modulations in the middle of the interval from 3–6 s (black bar) compared to untagged MFC neurons. (D) Across all 206 neurons in six VTA-vehicle mice, we used data-driven PCA to find patterns of neuronal activity. PCA identified three major components among MFC neuronal ensembles. (E) Scree plot of variance explained by each component; only PC1–PC3 were analyzed. (F) Thirty putative MFC D1DR neurons (red) and 176 untagged MFC neurons (blue) had distinct population trajectories in PC space. (G) Thirty putative MFC D1DR neurons (red) and 176 untagged MFC neurons (blue) had significantly different PC3 scores and had significantly different normalized distance in principal component space. Data are from six VTA-vehicle mice. ∗p < 0.05. Current Biology 2017 27, 39-47DOI: (10.1016/j.cub.2016.11.029) Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 4 Delta Optogenetic Stimulation of MFC D1DR Neurons Modulates Temporal Processing We compared the activity of MFC neurons with and without optogenetic stimulation of MFC D1DR neurons at 2 Hz in VTA-6OHDA mice. ∗p < 0.05. (A) Laser stimulation (blue bar) of MFC D1DRs only triggered increased activity in 41 putative MFC D1DR neurons (red) but not 234 untagged MFC neurons (blue). (B) This putative MFC D1DR neuron had an increased firing rate with optogenetic stimulation during interval timing (stimulation trials, black; unstimulated trials, red). (C) Stimulation of MFC D1DR neurons could change the activity of untagged MFC neurons by increasing its activity early in the trial (stimulation trials, green; unstimulated trials, blue). (D and E) Heatmaps of peri-event activity from 234 untagged MFC neurons in six VTA-6OHDA mice were different for stimulated (D) versus unstimulated (E) trials early in the interval (white boxes). (F) On average, stimulation increased activity early in the interval in 234 untagged MFC neurons (0–3 s; black bar; stimulation trials, green; unstimulated trials, blue). (G) To quantify this effect, we turned to principal component analysis (PCA), which revealed three large components. (H) PC1 and PC3 scores on stimulated trials compared to unstimulated trials resulting in significant differences in normalized distance among 234 untagged MFC neurons (stimulation trials, green; unstimulated trials, blue). (I) More untagged MFC neurons had a significant linear regression fit on stimulated versus unstimulated trials. These neurons had a steeper regression slope on stimulation trials. (J) Bayesian classification of predicted time from neuronal ensemble activity on stimulated versus unstimulated trials in VTA-6OHDA mice. The predicted time on each trial at each bin shown in in white; 50 trials are shown. (K) On stimulated trials, classifiers appeared to predict time better than on unstimulated trials and had significantly higher classification accuracy as quantified by R2 of predicted versus actual time (stimulation trials, green; unstimulated trials, blue). Data are from six VTA-6OHDA mice. Current Biology 2017 27, 39-47DOI: (10.1016/j.cub.2016.11.029) Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 5 Delta Stimulation of MFC D1DR Neurons Can Compensate for Impaired Temporal Control of Action Caused by VTA-6OHDA (A) Optogenetic stimulation of MFC D1DR neurons and histology (upper right) of ChR2-mCherry expression driven by D1-Cre+. All stimulation was unilateral. Bottom: a raster plot of responses from one mouse during interval timing compared in MFC D1DR stimulated (red) and unstimulated (gray) trials. (B) Normalized time-response histograms demonstrate that 2 Hz but not 20 Hz stimulation of putative MFC D1DR neurons improved interval-timing deficits in VTA-6OHDA mice. (C and D) Efficiency (C) and curvature (D) analysis demonstrated that interval-timing performance significantly changed in VTA-6OHDA mice with 2 Hz stimulation. No effects were seen in VTA-vehicle mice with intact dopamine, in control mice, or with mice with electrical stimulation at 2 or 20 Hz. (E) Optogenetic stimulation in D1-Cre+ mice with AAV-mCherry without ChR2 did not significantly change interval timing efficiency or curvature. (F) MFC electrical stimulation also did not significantly affect interval timing. Data from six VTA-vehicle and six VTA-6OHDA mice with ChR2, six VTA-vehicle and six VTA-6OHDA with virus without ChR2, and six VTA-vehicle and six VTA-6OHDA mice for electrical stimulation. ∗p < 0.05 via mixed-effects ANOVA. See also Figure S5. Current Biology 2017 27, 39-47DOI: (10.1016/j.cub.2016.11.029) Copyright © 2017 Elsevier Ltd Terms and Conditions