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Zhou W, Dantzer R, Budac DP, Walker AK, Mao-Ying QL, Lee AW, Heijnen CJ, Kavelaars A. Peripheral indoleamine 2,3-dioxygenase 1 is required for comorbid depression-like behavior but does not contribute to neuropathic pain in mice. Brain Behav Immun 2015; 46:147-53. [PMID: 25637485 PMCID: PMC4414738 DOI: 10.1016/j.bbi.2015.01.013] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Revised: 01/19/2015] [Accepted: 01/19/2015] [Indexed: 01/04/2023] Open
Abstract
Chronic pain frequently co-occurs with major depressive disorder but the mechanisms are poorly understood. We investigated the contribution of indoleamine 2,3-dioxygenase-1 (IDO1), a rate-limiting enzyme in the conversion of tryptophan to neurotoxic metabolites, to this comorbidity using the spared nerve injury (SNI) model of neuropathic pain in mice. SNI resulted in unilateral mechanical allodynia, reduced social interaction, and increased immobility in the forced swim test without changes in locomotor activity. These findings indicate SNI-induced pain and comorbid depression-like behavior. These behavioral responses were accompanied by increases in plasma kynurenine/tryptophan ratios and increased expression of Ido1 and Il1b mRNA in the liver. Interestingly, SNI did not induce detectable changes in spinal cord or brain Ido1 mRNA levels. SNI was associated with spinal cord inflammatory activity as evidenced by increased Il1b mRNA expression. The SNI-induced increase of liver Ido1and Il1b mRNA was abrogated by intrathecal administration of the IL-1 inhibitor IL-1RA. Intrathecal IL-1RA also inhibited both mechanical allodynia and depression-like behavior. We also show that Ido1 is required for the development of depression-like behavior because Ido1(-/-) mice do not develop increased immobility in the forced swim test or decreased social exploration in response to SNI. Mechanical allodynia was similar in WT and Ido1(-/-) mice. In conclusion, our findings show for the first time that neuropathic pain is associated with an increase of Ido1 in liver, but not brain, downstream of spinal cord IL-1β signaling and that Ido1 mediates comorbid depression. Moreover, comorbidity of neuropathic pain and depression are only partially mediated by a common mechanism because mechanical hyperalgesia develops independently of Ido1.
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Affiliation(s)
- Wenjun Zhou
- Department of Symptom Research, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Robert Dantzer
- Department of Symptom Research, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - David P. Budac
- Bioanalysis and Physiology, Lundbeck Research, Paramus, NJ 07652, USA
| | - Adam K. Walker
- Department of Symptom Research, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Qi-Liang Mao-Ying
- Department of Symptom Research, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA,Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, Shanghai Medical College, Institute of Acupuncture Research, Fudan University, Shanghai 200032, China
| | - Anna W. Lee
- Neuroinflammation Disease Biology Unit, Lundbeck Research USA, Paramus, NJ 07652, USA
| | - Cobi J. Heijnen
- Department of Symptom Research, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Annemieke Kavelaars
- Laboratory of Neuroimmunology, Department of Symptom Research, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
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Grohmann U, Puccetti P. The Coevolution of IDO1 and AhR in the Emergence of Regulatory T-Cells in Mammals. Front Immunol 2015; 6:58. [PMID: 25729384 PMCID: PMC4325913 DOI: 10.3389/fimmu.2015.00058] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 01/29/2015] [Indexed: 11/13/2022] Open
Affiliation(s)
- Ursula Grohmann
- Department of Experimental Medicine, University of Perugia , Perugia , Italy ; Department of Pathology, Albert Einstein College of Medicine , New York, NY , USA
| | - Paolo Puccetti
- Department of Experimental Medicine, University of Perugia , Perugia , Italy
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