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Neurogastroenterol Motil. 2017 Aug;29(8). doi: 10.1111/nmo.13060. Epub 2017 Mar 24.

Disrupted intrinsic connectivity of the periaqueductal gray in patients with functional dyspepsia: A resting-state fMRI study.

Liu P1,2, Wang G1,2, Liu Y1,2, Zeng F3, Lin D4, Yang X1,2, Liang F3, Calhoun VD4,5, Qin W1,2.

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Life Science Research Center, School of Life Science and Technology, Xidian University, Xi'an, China.
Engineering Research Center of Molecular and NeuroImaging, Ministry of Education, Xi'an, China.
Acupuncture and Tuina School, Chengdu University of Traditional Chinese Medicine, Chengdu, China.
The Mind Research Network, Albuquerque, NM, USA.
Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, USA.



Functional dyspepsia (FD) is a common functional gastrointestinal disorder. Accumulating evidence suggests the crucial role of central nervous system in the development and maintenance of FD. In particular, periaqueductal gray (PAG) has demonstrated an important role in modulation of pain and emotion, which may be related to FD. However, the study of the PAG in FD is still limited. This study aimed to assess intrinsic connectivity of the PAG in FD patients.


Resting-state functional magnetic imaging (fMRI) data were collected from 66 FD patients and 42 healthy controls (HCs). Functional connectivity analysis was performed to investigate the PAG connectivity pattern differences between the patients and HCs. We then examined the relationships between functional connectivity within the PAG networks and FD symptoms.


Compared to HCs, patients had increased PAG connectivity with the insula, and decreased PAG connectivity with the orbitofrontal cortex (OFC), dorsolateral prefrontal cortex (dlPFC) and hippocampus/parahippocampus (HIPP/paraHIPP). There were positive correlations between disease duration and PAG connectivity with the putamen and supplementary motor area (SMA), and positive correlations between symptom severity and PAG connectivity with the insula. FD patients with high level of anxiety and depression had altered PAG connectivity with the anterior cingulate cortex (ACC), precuneus, dlPFC and caudate, compared to other patients.


These findings indicate that abnormal intrinsic network of the PAG might be associated with abnormality of pain processing and disruption of emotion processing in FD patients. Our study further complements neuroimaging findings about FD.


fMRI; functional dyspepsia; intrinsic connectivity; periaqueductal gray

[Indexed for MEDLINE]

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