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Iglesias AG, Chiu AS, Wong J, Campus P, Li F, Liu ZN, Bhatti JK, Patel SA, Deisseroth K, Akil H, Burgess CR, Flagel SB. Inhibition of Dopamine Neurons Prevents Incentive Value Encoding of a Reward Cue: With Revelations from Deep Phenotyping. J Neurosci 2023; 43:7376-7392. [PMID: 37709540 PMCID: PMC10621773 DOI: 10.1523/jneurosci.0848-23.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 08/08/2023] [Accepted: 09/08/2023] [Indexed: 09/16/2023] Open
Abstract
The survival of an organism is dependent on its ability to respond to cues in the environment. Such cues can attain control over behavior as a function of the value ascribed to them. Some individuals have an inherent tendency to attribute reward-paired cues with incentive motivational value, or incentive salience. For these individuals, termed sign-trackers, a discrete cue that precedes reward delivery becomes attractive and desirable in its own right. Prior work suggests that the behavior of sign-trackers is dopamine-dependent, and cue-elicited dopamine in the NAc is believed to encode the incentive value of reward cues. Here we exploited the temporal resolution of optogenetics to determine whether selective inhibition of ventral tegmental area (VTA) dopamine neurons during cue presentation attenuates the propensity to sign-track. Using male tyrosine hydroxylase (TH)-Cre Long Evans rats, it was found that, under baseline conditions, ∼84% of TH-Cre rats tend to sign-track. Laser-induced inhibition of VTA dopamine neurons during cue presentation prevented the development of sign-tracking behavior, without affecting goal-tracking behavior. When laser inhibition was terminated, these same rats developed a sign-tracking response. Video analysis using DeepLabCutTM revealed that, relative to rats that received laser inhibition, rats in the control group spent more time near the location of the reward cue even when it was not present and were more likely to orient toward and approach the cue during its presentation. These findings demonstrate that cue-elicited dopamine release is critical for the attribution of incentive salience to reward cues.SIGNIFICANCE STATEMENT Activity of dopamine neurons in the ventral tegmental area (VTA) during cue presentation is necessary for the development of a sign-tracking, but not a goal-tracking, conditioned response in a Pavlovian task. We capitalized on the temporal precision of optogenetics to pair cue presentation with inhibition of VTA dopamine neurons. A detailed behavioral analysis with DeepLabCutTM revealed that cue-directed behaviors do not emerge without dopamine neuron activity in the VTA. Importantly, however, when optogenetic inhibition is lifted, cue-directed behaviors increase, and a sign-tracking response develops. These findings confirm the necessity of dopamine neuron activity in the VTA during cue presentation to encode the incentive value of reward cues.
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Affiliation(s)
- Amanda G Iglesias
- Neuroscience Graduate Program, University of Michigan, Ann Arbor, Michigan 48104
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
| | - Alvin S Chiu
- Neuroscience Graduate Program, University of Michigan, Ann Arbor, Michigan 48104
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
| | - Jason Wong
- College of Literature, Science, and the Arts, University of Michigan, Ann Arbor, Michigan 48104
| | - Paolo Campus
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
| | - Fei Li
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
| | - Zitong Nemo Liu
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
| | - Jasmine K Bhatti
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
| | - Shiv A Patel
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
| | - Karl Deisseroth
- Department of Bioengineering, Stanford University, Stanford, California 94305
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California 94305
- Howard Hughes Medical Institute, Stanford University, Stanford, California 94305
| | - Huda Akil
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan 48104
| | - Christian R Burgess
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
| | - Shelly B Flagel
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48104
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan 48104
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Richards LM, Whitley OKN, MacLeod G, Cavalli FMG, Coutinho FJ, Jaramillo JE, Svergun N, Riverin M, Croucher DC, Kushida M, Yu K, Guilhamon P, Rastegar N, Ahmadi M, Bhatti JK, Bozek DA, Li N, Lee L, Che C, Luis E, Park NI, Xu Z, Ketela T, Moore RA, Marra MA, Spears J, Cusimano MD, Das S, Bernstein M, Haibe-Kains B, Lupien M, Luchman HA, Weiss S, Angers S, Dirks PB, Bader GD, Pugh TJ. Gradient of Developmental and Injury Response transcriptional states defines functional vulnerabilities underpinning glioblastoma heterogeneity. Nat Cancer 2021; 2:157-173. [PMID: 35122077 DOI: 10.1038/s43018-020-00154-9] [Citation(s) in RCA: 102] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 11/16/2020] [Indexed: 12/27/2022]
Abstract
Glioblastomas harbor diverse cell populations, including rare glioblastoma stem cells (GSCs) that drive tumorigenesis. To characterize functional diversity within this population, we performed single-cell RNA sequencing on >69,000 GSCs cultured from the tumors of 26 patients. We observed a high degree of inter- and intra-GSC transcriptional heterogeneity that could not be fully explained by DNA somatic alterations. Instead, we found that GSCs mapped along a transcriptional gradient spanning two cellular states reminiscent of normal neural development and inflammatory wound response. Genome-wide CRISPR-Cas9 dropout screens independently recapitulated this observation, with each state characterized by unique essential genes. Further single-cell RNA sequencing of >56,000 malignant cells from primary tumors found that the majority organize along an orthogonal astrocyte maturation gradient yet retain expression of founder GSC transcriptional programs. We propose that glioblastomas grow out of a fundamental GSC-based neural wound response transcriptional program, which is a promising target for new therapy development.
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Affiliation(s)
- Laura M Richards
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Owen K N Whitley
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- The Donnelly Centre, University of Toronto, Toronto, Ontario, Canada
| | - Graham MacLeod
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
| | - Florence M G Cavalli
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Fiona J Coutinho
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Julia E Jaramillo
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Nataliia Svergun
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Mazdak Riverin
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Danielle C Croucher
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Michelle Kushida
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Kenny Yu
- Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Paul Guilhamon
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Naghmeh Rastegar
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Moloud Ahmadi
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
| | - Jasmine K Bhatti
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
| | - Danielle A Bozek
- Department of Cell Biology and Anatomy, University of Calgary, Calgary, Alberta, Canada
- Arnie Charbonneau Cancer Institute and Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
| | - Naijin Li
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Lilian Lee
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Clare Che
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Erika Luis
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Nicole I Park
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Zhiyu Xu
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Troy Ketela
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Richard A Moore
- Canada's Michael Smith Genome Sciences Centre, British Columbia Cancer, Vancouver, British Columbia, Canada
| | - Marco A Marra
- Canada's Michael Smith Genome Sciences Centre, British Columbia Cancer, Vancouver, British Columbia, Canada
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Julian Spears
- Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Michael D Cusimano
- Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Sunit Das
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
- Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Mark Bernstein
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
- Division of Neurosurgery, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada
| | - Benjamin Haibe-Kains
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
- Department of Computer Science, University of Toronto, Toronto, Ontario, Canada
- Vector Institute for Artificial Intelligence, Toronto, Ontario, Canada
| | - Mathieu Lupien
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - H Artee Luchman
- Department of Cell Biology and Anatomy, University of Calgary, Calgary, Alberta, Canada
- Arnie Charbonneau Cancer Institute and Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
| | - Samuel Weiss
- Department of Cell Biology and Anatomy, University of Calgary, Calgary, Alberta, Canada
- Arnie Charbonneau Cancer Institute and Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
| | - Stephane Angers
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - Peter B Dirks
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada.
- Developmental and Stem Cell Biology Program and Arthur and Sonia Labatt Brain Tumor Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada.
- Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada.
| | - Gary D Bader
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada.
- The Donnelly Centre, University of Toronto, Toronto, Ontario, Canada.
- Department of Computer Science, University of Toronto, Toronto, Ontario, Canada.
| | - Trevor J Pugh
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada.
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