Urination (also called micturition) is thought to be regulated by a neural network that is distributed in both subcortical and cortical regions. Previously, urination-related neurons have been identified in subcortical structures such as the pontine micturition center (also known as Barrington’s nucleus). However, the origin of the descending cortical pathway and how it interfaces with this subcortical circuit to permit voluntary initiation of urination remain elusive. Here we identified a small cluster of layer 5 neurons in the primary motor cortex whose activities tightly correlate with the onset of urination in freely behaving mice and increase dramatically during territorial marking. Optogenetically activating these neurons elicits contraction of the bladder and initiates urination, through their projections to the pontine micturition center, while silencing or ablating them impairs urination and causes retention of urine. Together these results reveal a novel cortical component upstream of the pontine micturition center that is critically involved in urination.
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Data and code availability
The data that support the findings of this study are available from the corresponding author upon reasonable request. All software code used to generate the results is also available from the corresponding author upon reasonable request.
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We thank J. Lou for assisting in the composition of the figures and the members of the Neuroscience Pioneer Club for valuable discussions. This work was supported by grants from the 1000 Talents Program for Young Scholars, the National Natural Science Foundation of China (No. 81671106, 81771175, 31700933), the National Basic Research Program of China (“973 Program”: 2015CB759500), the National Key Research and Development Program of China (2018YFA0109600), the Science Fund for Creative Research Group of China (61721092), and ULabor R&D Program (2017ULab0001).
Integrated supplementary information
Supplementary Figure 1 EGFP+ regions in the brain and the spinal cord after PRV injection into the bladder wall.
a, Reconstructed images (top) and diagrams (bottom) of PRV-EGFP-labeled regions in the mouse brain on the sagittal (left) or coronal plane (right). The PRV-infected brain areas mainly include cerebral cortex (cortex), medial preoptic area (MPA), paraventricular nucleus (PVN), lateral hypothalamic area (LH), red nucleus (Red N), periaqueductal grey (PAG), locus coeruleus (LC), pontine micturition center (PMC), gigantocellular reticular nucleus (Gi), A5 noradrenaline cells (A5) and raphe nuclei. d: dorsal; v- ventral; r: rostral; c: caudal; l: left; ri: right. b, Left, schematic representation of the descending neural pathways infected by PRV. Right, confocal images showing the sections corresponding to the left panel. c-f, Coronal sections showing the lateral hypothalamic area (LH), PAG, red nucleus (Red N), A5 noradrenaline cells (A5), the gigantocellular reticular nucleus (Gi) and the raphe nuclei. All of these experiments were repeated independently in 3 male mice with similar results.
Supplementary Figure 2 Time-dependent infection of different brain areas after PRV-EGFP injection into the bladder wall.
Representative images showing PRV-infected neurons (green) in different brain areas at different time points after the viral injection. Left: 3 days; middle: 4 days; right: 4.5–5 days. These experiments were performed in 3 male mice for each group.
Supplementary Figure 3 PRV-infected neurons in different areas after separate PRV injections into left and right bladder walls or into the abdominal muscle.
Left and middle panels, representative images showing PRV-infected neurons (green and red) in different brain areas from one mouse with by PRV-EGFP injected into the right bladder wall and PRV-RFP into the left bladder wall. This experiment was repeated independently in 3 male mice with similar results. Right panel, no infected neurons were detected in these brain regions after PRV injection into the abdominal muscle. This experiment was repeated independently in 3 male mice with similar results.
Supplementary Figure 4 PRV-infected brain areas in female mice after PRV injection into the bladder wall.
a, Representative images showing PRV-infected neurons (green) in different brain areas in a female mouse. b, Serial sections showing PRV-infected neurons in the cerebral cortex of a female mouse. The same experiments were performed in 3 female mice.
Supplementary Figure 5 Histological confirmation of local viral injection into the L5 of M1 for optical-fiber-based Ca2+ signal recordings.
Top and Middle, serial sections showing GCaMP6f-labeled areas around the injection site in M1. Bottom, serial brain sections showing overlay of viral expression areas (in grey) from 5 male mice.
Supplementary Figure 6 GCaMP6 experiments confirming the correlation between neuronal activities of M1 L5 neurons and urination.
a, Schematics of fiber photometry recording of M1 L5 neurons infected with AAV-Syn-GCaMP6f. b, Post-hoc histological image showing the GCaMP6f labeled L5 neurons and fiber implantation. This experiment was repeated independently in 3 male mice with similar results. c, Left, an example of Ca2+ transients recorded in a freely moving mouse. Dashed line indicates the voiding onset. Right, averaged Ca2+ signals aligned to the onset of urination (red) or to the shuffled voiding onset (black). n = 14 trials from 3 male mice with GCaMP6f labeling. d, Quantification of amplitudes of urination-related Ca2+ transients (red) compared to the shuffled Ca2+ signals (black). Two-sided Wilcoxon signed-rank test, ***P = 0.00098 (z = 3.296, df = 13). n = 14 trials from 3 male mice. e, Representative traces showing blocking of the observed Ca2+ signals after muscimol injection into M1. Note that in the presence of muscimol, no Ca2+ signal was observed while the animal was moving. f, Comparison of the amplitudes of Ca2+ signals during and after muscimol application. One-sided Wilcoxon signed-rank test, ***P = 1.0 × 10–11 (z = −6.703; df = 59), n = 60 trials from 3 male mice with GCaMP6f labeling (20 trials from each mouse). g, An example of Ca2+ signals recorded in GCaMP6f-expressing M1 L5 neurons (black) during locomotion (purple) and urination. Light yellow box highlights the process of urination. Urine deposition area plotted in the bottom in red. h, Magnified view from panel g. Red arrows represent the urination onset, a time point during urination, and the urination offset. i, Screenshots showing the process of urine deposition at the three corresponding time points in panel h. All bar graphs and error bars represent mean ± s.e.m.
a, Heatmap of the Ca2+ signals was merged with spatial distribution of urine spots (ovals) and with positions when the mouse was still (triangles). The mouse was tested in a home cage lined with filter paper over 5 days (2 h for each day). The mouse was not given saline intraperitoneal (i.p.) injection before testing. b, Comparison of the amplitudes of Ca2+ signals during urinationand when the animals were still. One-sided Wilcoxon rank-sum test, ***P = 4.5 × 10–6 (z = 4.438; df = 28); n = 15 trials from 3 male mice. These experiments were performed with GCaMP6f labeling. All bar graphs and error bars represent mean ± s.e.m.
a, An example of Ca2+ transients recorded in the M1 L5 of a female mouse. The red arrow indicates the urination onset. b, Overlay of all Ca2+ transients aligned to the onset of urination. n = 18 trials from 7 female mice. c, Averaged Ca2+ signal in M1 aligned to the urination onset (red) or to the shuffled urination onset (black). d, Quantification of amplitudes of urination-related Ca2+ transients (red) compared to the shuffled Ca2+ signals (black). Two-sided Wilcoxon signed-rank test, ***P = 0.0002 (z = 3.724, df = 17). n = 18 trials from 7 female mice. All bar graphs and error bars represent mean ± s.e.m.. e, Quantification of fraction of Ca2+ transients that correlated with urination compared to shuffled signals. Two-sided paired t-test, ***P = 0.00024 (t = 7.778; df = 6). n = 7 female mice. Box-and-whisker plot, center line (black bar), median; box, 25%–75% interquartile range; whiskers (grey bars), minimum and maximum. f, Onsets of M1 Ca2+ transients plotted relative to the onset of urination(dashed line). These experiments were performed with OGB-1AM labeling.
a, Schematics of AAV-CaMKII-EGFP injection into M1 L5. b, Left and middle, images showing coronal slices of EGFP expression in L5 of the M1 (left) and EGFP-labeled axons in the PMC (middle). Right, An enlarged view around the area highlighted by the dashed circle from the middle panel. n = 5 male mice. c, Schematics of VSV-mCherry injection into M1. d, 6–7 days after VSV-mCherry injection into M1, anterograde-labeled neurons were observed in LC and PMC (top, middle). VSV-infected neurons were also detected in L1-L2 (top, right) and S6-S1 (bottom). The enlarged views of SPN are shown (bottom, middle and right). SPN, sacral parasympathetic neurons. L, left. R, right. 4 V, fourth ventricle. Tyrosine hydroxylase (TH) staining was used to label LC neurons. n = 3 male mice.
Supplementary Figure 10 Local injection of muscimol into M1 impairs urination; and histological confirmation of ablation of M1 neurons in the area corresponding to the region identified by PRV.
a, Schematics of the experimental protocol. b, Left, schematics showing the injection sites. Right, post-hoc histology showing the injection site. c, Quantification of the effects of muscimol or ACSF injection into different brain regions on urination(muscimol into M1: 12 male mice; ACSF into M1: 10 male mice; muscimol into Ma: 10 male mice; muscimol into the PMC: 10 male mice; ACSF into the PMC: 10 male mice; one-sided Wilcoxon signed-rank test for muscimol group compared with washout group or one-sided Wilcoxon rank-sum test for the other comparisons (***P = 0.000034, 0.000031, 0.000073, **P = 0.0012, 0.0028; z = −3.039, −3.986, −4.004, −2.772, −3.796; df = 11, 20, 20, 9, 18 from left to right). d, Quantification of the effects of muscimol or ACSF injection into the M1 of female mice on urination (muscimol into M1: 7 female mice; ACSF into M1: 7 female mice). One-sided Wilcoxon rank-sum test, ***P = 0.0008 (z = −3.154; df = 12). e, Serial coronal sections showing the NeuN staining in red and DAPI in blue in the M1 area 4 weeks after co-injection of AAV-CaMKII-Cre-GFP and AAV-DIO-taCasp3. This experiment was repeated independently in 11 male mice with similar results. All bar graphs and error bars represent mean ± s.e.m.
Supplementary Figures 1–10
Simultaneous recordings of Ca2+ signals in M1, locomotion and urination behavior. This movie corresponds to Supplementary Fig. 6
Simultaneous photostimulation of M1 L5 neurons and measurement of urination behavior