Abstract
Aggression is costly and requires tight regulation. Here we identify the projection from estrogen receptor alpha-expressing cells in the caudal part of the medial preoptic area (cMPOAEsr1) to the ventrolateral part of the ventromedial hypothalamus (VMHvl) as an essential pathway for modulating aggression in male mice. cMPOAEsr1 cells increase activity mainly during male–male interaction, which differs from the female-biased response pattern of rostral MPOAEsr1 (rMPOAEsr1) cells. Notably, cMPOAEsr1 cell responses to male opponents correlated with the opponents’ fighting capability, which mice could estimate based on physical traits or learn through physical combats. Inactivating the cMPOAEsr1–VMHvl pathway increased aggression, whereas activating the pathway suppressed natural intermale aggression. Thus, cMPOAEsr1 is a key population for encoding opponents’ fighting capability—information that could be used to prevent animals from engaging in disadvantageous conflicts with superior opponents by suppressing the activity of VMHvl cells essential for attack behaviors.
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Data availability
Raw values associated with each figure panel can be found in the source data files. Fiber photometry recording data, behavior annotations and raw representative histology images can be downloaded from https://doi.org/10.5281/zenodo.7700343. Behavior videos and additional histology images are available from the corresponding author upon reasonable request. Source data are provided with this paper.
Code availability
MATALB code used in this study can be downloaded from https://doi.org/10.5281/zenodo.7700343.
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Acknowledgements
We thank L. Shan and C. Richter for help with behavior annotation, and L. Yin for providing some MATLAB codes for analysis. This research was supported by National Institutes of Health grants R01MH101377, R01MH124927, R01HD092596 and U19NS107616 (D.L.); the Mathers Foundation and the Vulnerable Brain Project (D.L.); the Uehara Memorial Foundation, JSPS Overseas Research Fellowship and Osamu Hayaishi Memorial Scholarship (T.O.); and the Sumitomo Foundation (T.Y.).
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D.L. conceived the project, designed experiments, analyzed data and wrote the paper. D.W. codesigned and performed most experiments, analyzed data, prepared figures and cowrote the paper. T.O. and T.Y. performed some tracing experiments. T.O. and Y.J. performed some behavior tests and animal tracking. Z.G. performed some photometry recordings. A.V. assisted with histology analysis and animal behavior training. R.Y. performed some behavior tests to quantify the RHP of animals with different genetic background.
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Extended data
Extended Data Fig. 1 cMPOA in males show higher aggressor cue-induced c-Fos after defeat.
(a), Schematic illustration of the experimental procedures. CCC: cup-cup-cup; DDC: defeat-defeat-cup. (b), Schematic illustration of the cup assay performed on the third day. (c), Percentage of time the animal spent in far zone, as illustrated in (b). (d), Percentage of time the animal spent on approaching and investigating the cupped aggressor. (e), Frequency of approach toward the cupped aggressor. (f), Representative images showing c-Fos expressing cells in rMPOA and cMPOA after CCC and DDC tests. Scale bar, 0.5 mm. (g), Quantification of c-Fos-positive cells in the rMPOA and cMPOA in CCC and DDC groups. Four sections were counted for each MPOA sub-region for each animal. All data are presented as mean ± s.e.m. (c–e), n = 4 mice for CCC group, and 5 mice for DDC group. (g), n = 4 mice per group. Two-tailed paired t-test; *P < 0.05; **P < 0.01; Otherwise, P > 0.05.
Extended Data Fig. 2 RHP of each animal in pairs of male mice with different genetic backgrounds.
SW test males are single-housed, sexually experienced and with repeated winning experience. C57 test males are single-housed, sexually naive and with no or one-time winning experience. BC test males are group-housed, sexually naive and with no winning experience.
Extended Data Fig. 3 Inhibiting cMPOAEsr1 cells does not elicit aggression in non-aggressive male mice.
(a) Viral strategy for chemogenetic inhibition of cMPOAEsr1 cells in non-aggressive male mice. (b) A representative histology image (n = 4 mice) showing the expression of hM4Di-mchery in cMPOAEsr1 cells. Scale bar, 1 mm. (c) Experimental timeline. (d,f) hM4Di test male mice showed no attack toward a male intruder (d) or a female intruder (f) after saline or CNO injection. (e,g) Investigation duration toward a male intruder (e) or a female intruder (g) increased after CNO injection in comparison to saline injection in hM4Di non-aggressive male mice. All data are presented as mean ± s.e.m. n = 4 mice. Two-tailed paired t-test (e and g); *P < 0.05.
Extended Data Fig. 4 Projection pattern of cMPOAEsr1 cells in male mice.
(a) Viral strategy for expressing Synaptophysin-mCherry in cMPOAEsr1 cells. (b) A representative histology image showing the expression of Synaptophysin-mCherry in MPOAEsr1 cells. Scale bar, 1 mm. (c) Quantification of Synaptophysin-mCherry signal in various regions across the brain. For each animal, intensity in each region is normalized by the highest intensity among all regions. (d) Representative images showing Synaptophysin-mCherry signal in various brain regions of a male mouse. LSv, lateral septum ventral part; PVN, paraventricular nucleus of the hypothalamus; RCH, retrochiasmatic area; PV, periventricular hypothalamic nucleus; ARH, Arcuate hypothalamic nucleus; DMH, dorsomedial hypothalamic nucleus; VMHvl, ventromedial hypothalamus ventrolateral part; TU, tuberal nucleus; MeAPd, medial amygdala nucleus posterodorsal part; PMv, ventral premammillary nucleus; PVP, periventricular hypothalamic nucleus, posterior part; PA, posterior amygdala; PAG, periaqueductal gray; SUM, supramammillary nucleus; VTA, ventral tegmental area. All data are presented as mean ± s.e.m. n = 4 mice.
Extended Data Fig. 5 Monosynaptic rabies tracing reveals strong inputs from both rostral and caudal MPOA to VMHvlEsr1 cells.
(a) Schematic illustration of viral injections for monosynaptic rabies tracing. All viruses were injected unilaterally. (b) A representative image showing expression of mCherry (red) and GFP (green) in the VMHvl. Scale bar, 1 mm. (c) Number of GFP-positive cells per 100 starter cells in the VMHvl in the MPOA on each 30 µm section along the anterior–posterior axis. (d) The total number of GFP-positive cells in the rMPOA (r) and cMPOA (c). The GFP cell number is normalized by the starter cell number in the VMHvl. Two-tailed paired t-test. ns: P > 0.05. (e) A representative image showing starter cells that express both mCherry (red) and GFP (green) in the VMHvl. Scale bar, 0.5 mm. (f) Representative images showing GFP cells in the MPOA from Bregma level 0.2 mm to −0.28 mm. Scale bar, 0.5 mm. All data are presented as mean ± s.e.m. (c,d), n = 4 mice.
Extended Data Fig. 6 Optogenetic activation of cMPOAEsr1-VMHvl pathway suppresses attack in naive SW males.
(a) Viral strategy for optogenetic activation of cMPOAEsr1-VMHvl terminals in naive SW males. (b) Experimental timeline. (c,d) Representative raster plots showing attack and investigation toward a male intruder in mCherry control mice aligned to sham (c) and light (d) onsets. (e,f) Representative raster plots from a ChR2 test mouse. (g-j) The stop attack latency (g), attack re-initiation probability (h), attack duration per trial (i), and investigation duration per trial (j) toward a C57 male intruder during sham and light stimulation of mCherry control and ChR2 test SW mice. All data are presented as mean ± s.e.m. n = 6 mice for mCherry group and 7 mice for ChR2 group. Two-way RM ANOVA with Sidak’s multiple comparisons test (g-j); *P < 0.05; **P < 0.01; Otherwise, P > 0.05.
Extended Data Fig. 7 Optogenetic inactivation of cMPOAEsr1-VMHvl projection does not induce attack in non-aggressive male mice.
(a) Viral strategy for optogenetic inactivation of cMPOAEsr1-VMHvl terminals. (b) Experimental timeline. (c,d) The average attack duration (c) and investigation duration (d) toward a male intruder during each 20 s sham and light stimulation in stGtACR2 non-aggressive male mice. (e,f) The average attack duration (e) and investigation duration (f) toward a female intruder during each 20 s sham and light stimulation in stGtACR2 non-aggressive male mice. All data are presented as mean ± s.e.m. n = 4 mice. (d and f) Two-tailed paired t-test. All P > 0.05.
Extended Data Fig. 8 Optogenetic activation or inhibition of cMPOAEsr1-VMHvl terminals is aversive.
(a) Virus injection and fiber placement for cMPOAEsr1-VMHvl terminal manipulation. (b) Experimental timeline. (c) Schematics for RTPP test. (d) Heatmaps showing the body center location of the test mouse before and during light pairing. Blue triangles indicate light-paired chambers. (e) Percentage of time spent in light-paired chamber at the baseline and during light stimulation periods. All data are presented as mean ± s.e.m. n = 5 mice for mCherry group, 6 mice for ChR2 group, and 6 mice for stGtACR2 group. Two-way RM ANOVA with Sidak’s multiple comparisons test. **P < 0.01; Otherwise, P > 0.05.
Extended Data Fig. 9 One-time defeat strongly suppresses aggression of the loser toward the winner.
(a) Schematic illustration of the assays. (b,c) Latency to attack a non-aggressive BC male intruder (b) and the total duration of attack (c) before and after defeat by the SW aggressor. (d,e) Latency to attack an aggressive SW male intruder (d) and the total duration of attack (e) before and after defeat by the same SW aggressor. All data are presented as mean ± s.e.m. (b-e), n = 7 mice. Two-tailed paired t-test; *P < 0.05; Otherwise, P > 0.05.
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Wei, D., Osakada, T., Guo, Z. et al. A hypothalamic pathway that suppresses aggression toward superior opponents. Nat Neurosci 26, 774–787 (2023). https://doi.org/10.1038/s41593-023-01297-5
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DOI: https://doi.org/10.1038/s41593-023-01297-5
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