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Li YX, An H, Wen Z, Tao ZY, Cao DY. Can oxytocin inhibit stress-induced hyperalgesia? Neuropeptides 2020; 79:101996. [PMID: 31776011 DOI: 10.1016/j.npep.2019.101996] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 11/13/2019] [Accepted: 11/13/2019] [Indexed: 11/19/2022]
Abstract
Stress-induced hyperalgesia is a problematic condition that lacks an effective therapeutic measure, and hence impairs health-related quality of life. The regulation of stress by oxytocin (OT) has overlapping effects on pain. OT can alleviate pain directly mainly at the spinal level and the peripheral tissues. Additionally, OT plays an analgesic role by dealing with stress and fear learning. When OT relieves stress by targeting the prefrontal brain regions and the hypothalamic-pituitary-adrenal axis, the body's sensitivity to pain is attenuated. Meanwhile, OT facilitates fear learning and may, in turn, enhance the anticipatory actions to painful stimulation. The unique therapeutic value of OT in patients suffering from stress and stress-related hyperalgesia conditions is worth considering. We reviewed recent advances in animal and human studies involving the effects of OT on stress and pain, and discussed the possible targets of OT within the descending and ascending pathways in the central nervous system. This review provides an overview of the evidence on the role of OT in alleviating stress-induced hyperalgesia.
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Affiliation(s)
- Yue-Xin Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Research Center of Stomatology, Xi'an Jiaotong University College of Stomatology, 98 West 5th Road, Xi'an, Shaanxi 710004, PR China; Department of Special Dental Care, Xi'an Jiaotong University College of Stomatology, 98 West 5th Road, Xi'an, Shaanxi 710004, PR China
| | - Hong An
- Department of Special Dental Care, Xi'an Jiaotong University College of Stomatology, 98 West 5th Road, Xi'an, Shaanxi 710004, PR China.
| | - Zhuo Wen
- Department of Special Dental Care, Xi'an Jiaotong University College of Stomatology, 98 West 5th Road, Xi'an, Shaanxi 710004, PR China
| | - Zhuo-Ying Tao
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Research Center of Stomatology, Xi'an Jiaotong University College of Stomatology, 98 West 5th Road, Xi'an, Shaanxi 710004, PR China
| | - Dong-Yuan Cao
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Research Center of Stomatology, Xi'an Jiaotong University College of Stomatology, 98 West 5th Road, Xi'an, Shaanxi 710004, PR China.
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Murphy JE, Yanes JA, Kirby LAJ, Reid MA, Robinson JL. Left, right, or bilateral amygdala activation? How effects of smoothing and motion correction on ultra-high field, high-resolution functional magnetic resonance imaging (fMRI) data alter inferences. Neurosci Res 2020; 150:51-59. [PMID: 30763590 PMCID: PMC7566741 DOI: 10.1016/j.neures.2019.01.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 01/28/2019] [Accepted: 01/31/2019] [Indexed: 01/10/2023]
Abstract
Given the amygdala's role in survival mechanisms, and its pivotal contributions to psychological processes, it is no surprise that it is one of the most well-studied brain regions. One of the common methods for understanding the functional role of the amygdala is the use of functional magnetic resonance imaging (fMRI). However, fMRI tends to be acquired using resolutions that are not optimal for smaller brain structures. Furthermore, standard processing includes spatial smoothing and motion correction which further degrade the resolution of the data. Inferentially, this may be detrimental when determining if the amygdalae are active during a task. Indeed, studies using the same task may show differential amygdala(e) activation. Here, we examine the effects of well-accepted preprocessing steps on whole-brain submillimeter fMRI data to determine the impact on activation patterns associated with a robust task known to activate the amygdala(e). We analyzed 7T fMRI data from 30 healthy individuals collected at sub-millimeter in-plane resolution and used a field standard preprocessing pipeline with different combinations of smoothing kernels and motion correction options. Resultant amygdalae activation patterns were altered depending on which combination of smoothing and motion correction were performed, indicating that whole-brain preprocessing steps have a significant impact on the inferences that can be drawn about smaller, subcortical structures like the amygdala.
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Affiliation(s)
- Jerry E Murphy
- Department of Psychology, 226 Thach Hall, Auburn University, Auburn, AL, 36849, United States; Auburn University MRI Research Center, 560 Devall Drive, Auburn, AL, 36849, United States.
| | - Julio A Yanes
- Department of Psychology, 226 Thach Hall, Auburn University, Auburn, AL, 36849, United States; Auburn University MRI Research Center, 560 Devall Drive, Auburn, AL, 36849, United States
| | - Lauren A J Kirby
- Department of Psychology, 226 Thach Hall, Auburn University, Auburn, AL, 36849, United States; Auburn University MRI Research Center, 560 Devall Drive, Auburn, AL, 36849, United States
| | - Meredith A Reid
- Department of Psychology, 226 Thach Hall, Auburn University, Auburn, AL, 36849, United States; Auburn University MRI Research Center, 560 Devall Drive, Auburn, AL, 36849, United States; Department of Electrical and Computer Engineering, Auburn University, Auburn, AL, 36849, United States; Alabama Advanced Imaging Consortium, United States
| | - Jennifer L Robinson
- Department of Psychology, 226 Thach Hall, Auburn University, Auburn, AL, 36849, United States; Auburn University MRI Research Center, 560 Devall Drive, Auburn, AL, 36849, United States; Department of Electrical and Computer Engineering, Auburn University, Auburn, AL, 36849, United States; Alabama Advanced Imaging Consortium, United States; Center for Neuroscience, Auburn University, AL, 36849, United States
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