Abstract
Neuroimaging studies have demonstrated the critical role of the insula in pain pathways and its close relation with the perceived intensity of nociceptive stimuli. We aimed to identify the structural and functional characteristics of the insula during periovulatory phase in women with primary dysmenorrhea (PDM), and further investigate its association with the intensity of perceived pain during menstruation. Optimized voxel-based morphometry and functional connectivity (FC) analyses were applied by using 3-dimensional T1-weighted and resting functional magnetic resonance imaging (fMRI) in 36 patients at the peri-ovulation phase and 29 age-, education-, and gender-matched healthy controls (HC). A visual analogue scale (VAS) was used to examine the intensity of the abdominal pain at periovulation and menstruation. In our results, PDM patients had significant higher VAS-rating during menstruaion than periovulation. Compared with the HC, PDM patients had lower gray matter density in the left anterior insula (aINS). Taken the left aINS as a seed region, we further found hypoconnectivity between aINS and medial prefrontal cortex (mPFC), which showed negative relation with the VAS during menstruation. As the aINS is a key site of the salience network (SN) and the mPFC is a critical region in the default mode network (DMN), it’s implicated a trait-related central-alteration that communications between pain attention and perception networks were disrupted without the ongoing menstrual pain. Moreover, result of correlation analysis, at least in part, suggested a possible role of altered FC (pain-free period) in predicting pain perception (menstruation).
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Wanghuan Dun, Jing Yang, Ling Yang, Dun Ding, Shaohui Ma, Feng-Li Liang, Karen M. von Deneen, and Xiao-ling Xu critically reviewed the content and approved the final version for publication. They declared no conflict of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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This work was supported by the National Natural Science Foundation of China (Grant No. 81,371,530, 81,571,640 and 81,471,737) and the Research Funds of the First Affiliated Hospital of Xi’an Jiaotong University, College of Medicine (Grant No. 2014YK1).
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Wanghuan Dun and Jing Yang contributed equally to this work and should be considered co-first authors.
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Dun, Wh., Yang, J., Yang, L. et al. Abnormal structure and functional connectivity of the anterior insula at pain-free periovulation is associated with perceived pain during menstruation. Brain Imaging and Behavior 11, 1787–1795 (2017). https://doi.org/10.1007/s11682-016-9646-y
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DOI: https://doi.org/10.1007/s11682-016-9646-y