Gray Matter Atrophy within the Default Mode Network of Fibromyalgia: A Meta-Analysis of Voxel-Based Morphometry Studies

Lin, Chemin; Lee, Shwu-Hua; Weng, Hsu-Huei

doi:https://doi.org/10.1155/2016/7296125

BioMed Research International

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Abstract Introduction Methods and Materials Results Discussion Limitations Conclusions Disclosure Authors’ Contributions Acknowledgments References Copyright Related Articles

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Molecular Mechanism of Rheumatic Diseases and Efficacy of Current Therapies

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Review Article | Open Access

Volume 2016 | Article ID 7296125 | https://doi.org/10.1155/2016/7296125

Gray Matter Atrophy within the Default Mode Network of Fibromyalgia: A Meta-Analysis of Voxel-Based Morphometry Studies

Chemin Lin,^1,2Shwu-Hua Lee ,^2,3and Hsu-Huei Weng^4,5,6,7,8

Academic Editor: Sadiq Umar

Received16 Sept 2016

Accepted06 Dec 2016

Published26 Dec 2016

Abstract

Over the years, studies have demonstrated morphological changes in the brain of fibromyalgia (FMS). We aimed to conduct a coordinate-based meta-analytic research through systemic review on voxel-based morphometry (VBM) imaging results to identify consistent gray matter (GM) difference between FMS patients and healthy subjects. We performed a comprehensive literature search in PubMed (January 2000–December 2015) and included six VBM publication on FMS. Stereotactic data were extracted from 180 patients of FMS and 123 healthy controls. By means of activation likelihood estimation (ALE) technique, regional GM reduction in left medial prefrontal cortex and right dorsal posterior cingulate cortex was identified. Both regions are within the default mode network. In conclusion, the gray matter deficit is related to the both affective and nonaffective components of pain processing. This result also provided the neuroanatomical correlates for emotional and cognitive symptoms in FMS.

1. Introduction

Fibromyalgia (FM) is characterized by chronic widespread pain with accompanying symptoms, such as fatigue, morning stiffness, insomnia, cognitive dullness, depression, and anxiety [1, 2]. Not only does FM impair life quality [3], but it also increases disability and absence from work [4]. With the evolving diagnostic criteria of FM [5], the prevalence rate is estimated about 2~4% in the general population with female predominance [6, 7]. Despite genetic, environmental, and biochemical factors proposed as the underlying pathophysiology [8, 9], the exact mechanism pertaining to FM is still under debate. Early research on peripheral neural or muscular damage in patients of FM failed to detect consistent evidence [10]. Therefore, central sensitization has been proposed to explain the features of FM, including allodynia (increased sensitivity to stimulus that does not normally provoke pain) and hyperalgesia (heightened response to painful stimulus) [11, 12].

Over the past two decade, central sensitization theory can be further exemplified in the studies using neuroimaging techniques. Single-photon-emission-computed tomography (SPECT) imaging has demonstrated regional cerebral blood flow (rCBF) decrease in thalamus and pontine region in patients of FM [13, 14]. The ensuing PET study has not only shown rCBF decrease in several brain regions, supporting the dysfunctional cognitive processing of pain, but also higher retrosplenial rCBF, suggesting secondary hyperalgesia [15]. Since the inception of functional magnetic resonance imaging (fMRI), it became easier to infer neural activity by proxy of blood-oxygen-level-dependent (BOLD) contrast without the need of radioactive tracer or contrast agent. Multiple paradigms were applied to study the differential activation between FM patients and normal controls. With the stimuli of pressure [16–18], repetitive heat pulses [19], nociceptive injection [20], or even incision of forearm [21], compared to normal, FM patients showed increased activation in assorted pain related brain areas, such as thalamus, primary (S1) as well as secondary (S2) somatosensory cortices, insula, and cingulate cortex [16–21]. On the other hand, impaired descending inhibitory pain system was evinced from the results of decreased activation in rACC (rostral anterior cingulate cortex) and thalamus [18] and reduced resting-state functional connectivity between ACC with PAG (periaqueductal gray) [22] in FM patients.

Although tasked-related fMRI helps us extract specific cognitive function in FM patients, the variety of different paradigms impede us from compiling or comparing all these studies directly. Besides functional changes, research on structural changes in chronic pain patients has concurrently been in the limelight. Voxel-based morphometry (VBM) [23] is the most widely employed technique and has been implicated in several groups, including chronic low back pain [24, 25], tension headache [26], irritable bowel syndrome [27], and chronic pelvic pain [28]. In fibromyalgia, several articles using region-of-interest (ROI) method focusing on “pain matrix” in brain have discovered gray matter decrease in anterior [29–31] and midcingulate [29] cortices, prefrontal cortex [30], midinsula [29], amygdala [30, 31], right and left lateral orbitofrontal cortex [31], and hippocampi [32].

These studies reiterated the theoretical importance of the key brain regions. However, unbiased whole-brain studies could also be conducted by VBM without need of selected ROIs. Furthermore, by using meta-analytic approach of activation likelihood estimate (ALE) method [33, 34], we are able to pinpoint consistent structural brain changes in several illness, such as schizophrenia [35], bipolar disorder [36], posttraumatic stress disorder [37], Alzheimer’s disease [38], narcolepsy [39], chronic pain [40], and headache [41]. Therefore, to provide greater insight into the structure changes of FM, current study aims to review the findings from all the whole-brain VBM research published to date and to conduct an ALE-based meta-analysis. We also hypothesize that we could observe convergent brain areas associated with the features FM encompasses.

2. Methods and Materials

2.1. Search Strategies and Selection Criteria

We conducted a comprehensive literature search in PubMed database (January 2000–December 2015) by using the key works “fibromyalgia,” “voxel,” “morphometry,” “voxel-based morphometry,” and “VBM.” We did not set specific restrictions on language of the literature. Cited articles in systemic reviews related to brain structure changes in fibromyalgia were also examined to increase any possibility of unincluded papers in previous literature search. Two independent investigators (LC and WHH) evaluated the methodology and the quality of the selected studies, where demographics, name of the first author, publication year, title of the journal, age of the participants, total number of participants, sex ratio, matching method, and the methods and thresholds in SPM were also examined.

2.2. Study Selection

2.2.1. Inclusion Criteria

The inclusion criteria for the studies in this meta-analysis are (1) peer-reviewed articles with retrievable full-text, (2) patients were diagnosed with fibromyalgia with healthy controls, (3) VBM procedure in MR anatomical analysis done in whole-brain structure by either GMV or GMC; we excluded region-of-interest (ROI) or volume-of-interest (VOI) method, and (4) peak coordinates available in Montreal Neurologic Institute (MNI) or Talairach and Tournoux stereotactic space.

2.2.2. Data Extraction

We inputted the , , and peak activation coordinates from the eligible contrasts into the meta-analysis. Coordinates reported in MNI space were converted to Talairach coordinates [42, 43]. We texted and employed the MNI coordinates from the data to GingerALE 2.1.1 (http://brainmap.org/ale/, Research Imaging Institute of the University of Texas Health Science Center, San Antonio, TX).

2.2.3. ALE Meta-Analysis

The version of current ALE approach [33, 44, 45] is the one implemented from the CBMA of neuroimaging results [34, 45]. In short, each stereotactic coordinates were represented as the peak center of the three-dimensional (3D) Gaussian probability distribution. A computed modeled activation (MA) map was derived to encapsulate the localization probabilities. The sample size of each study was used to estimate the spatial uncertainty related to the activation [46]. The overlapping of the distributions across different studies was calculated. We calculated the ALE values voxel-by-voxel by summing the MA maps derived from above. In doing so, the current analysis would not deal with foci (fixed effects), but with the concurrence from the studies (random effects). We set a 0.05 false discovery rate (FDR; q) for multiple comparisons correction [34, 47] with a minimum cluster size 200 mm³. We created NIfTI (.nii) format in our output image and displayed result with Mango (Multi-Image Analysis Graphical User Interface [GUI]), along with MNI space Colin brain template [48]. We labeled the clusters by using SPM Anatomy Toolboxv1.8 (http://www.fz-juelich.de/inm/inm-1/DE/Forschung/_docs/SPMAnatomyToolbox/SPMAnatomyToolbox_node.html) [46, 49, 50].

3. Results

Based on the inclusion criteria, 7 VBM studies [51–57], in which 8 groups of comparison between FMS patients and controls, were eligible in the final analysis (Table 1). In sum, 180 fibromyalgia patients and 123 controls were included. A total of 47 peak coordinates were reported for brain structural changes, of which 31 were included for decreased gray matter and 16 were included for increased gray matter, in patients of FMS compared with NC. The ALE meta-analysis revealed gray matter decreased in patients of FMS in 2 clusters (illustrated in Figure 1 and Table 2), including left medial prefrontal cortex, extending partly to anterior cingulate area (mPFC/ACC, BA 9/32, cluster size: 432 mm³, and coordinates of cluster maxima: : −10, : 34, : 30) and right dorsal posterior cingulate cortex, extending to posterior-midcingulate cortex (dPCC/pMCC, BA 31, cluster size: 368 mm³, and coordinates of cluster maxima: : 12, : −18, : 42). We adopted the classification proposed by Vogt and Destrieux [58, 59] in the subdivisions of the cingulate cortex. No foci survived in the analysis showing gray matter increases in the reverse contrast.

(a)

(b)

4. Discussion

We employed meta-analytic analysis with ALE to pool VBM studies to assess the structural brain changes between FM patients and healthy subjects. We identified the patients of FM to have GM reduction in left mPFC and right dPCC.

mPFC has been denoted as part of the medial pain system [60, 61]. Stimulation of mPFC with transcranial magnetic stimulation (TMS) pulse may increase sensitivity [62] and decrease threshold of pain perception [63]. In another single-photon emission computed tomography (SPECT) study, the deactivation of mPFC after repetitive TMS over the primary motor cortex was correlated with pain reduction [64]. Thus, mPFC has been postulated to be involved in the descending pain modulation system [65, 66], whether inhibitory or facilitatory. Therefore, our result may be supportive to the proposed mechanism of the dysfunctional descending analgesia in FMS, rendering the chronic widespread pain [67, 68].

Besides pain, neuropsychological symptoms, including depression, anxiety [69], and cognitive complaints [70], are frequent in FMS. As catastrophizing may amplify pain processing [71], it is found that brain activity in mPFC is correlated with catastrophizing [72]. A plausible explanation is that, along with ACC, mPFC is the brain region activated by the anticipation of pain [73] and serves as motivational aspect of pain [74]. Moreover, the morphology in mPFC is negatively correlated with performance in working memory and positively correlated with pain perception [75], a finding that signifies the pain-cognition interaction. In sum, MPFC is the brain region known to modulate cognitive and emotional processing. Along the caudal-rostral axis of mPFC, objective, subject, and even meta-cognitive aspects of pain are represented [76]. It may be these varied functions of mPFC to account for the diverse symptoms in FMS.

Another area that exhibited decreased GM volume in FMS was right dorsal PCC. In the more specific breakdown of this cluster in our study, it actually comprises of dPCC and pMCC. Dorsal (rostral) PCC is associated with pain in meta-analysis [77], and pMCC is the region linked with several chronic somatic pain disorders [78]. Unlike the involvement of mPFC and ACC in the emotional component of pain processing [79], dPCC/pMCC is related to orienting the body toward nocuous stimuli, the nonaffective component of pain processing [59], and contributes to the prepotent withdrawal reaction from pain [80]. Damage of dPCC/pMCC could lead to visuospatial damage [81].

While clock drawing test has been employed as a screening tool for cognitive decline in FMS [82], visuospatial memory impairment has been denoted as the early signal of cognitive decline in FMS, even in ahead of verbal memory decline [83, 84]. Our result may provide the neural underpinning for this domain of cognitive deficit in FMS. Besides its role in orienting motor response, dPCC/pMCC is also the initial region demonstrating damage in mild cognitive impairment [81]. Along with MPFC, PCC is involved in self-referential mental activity [85] and plays a pivotal part in default mode network (DMN) [86]. Convergent evidences have reported reduced metabolic activities in PCC in early Alzheimer’s disease [87], cognitive decline [88], and ageing [89]. Hence, GM decrease in PCC is attributable to the cognitive dysfunction frequently found in FMS [54] and is also supportive to the view that FMS accelerates premature ageing of the brain [51].

The finding of concurrent GM decrease in mPFC and dPCC in our result does not come in coincidence as they are among the key brain regions constituting DMN. The implication of this result could be inferred from previous resting-state functional connectivity brain imaging studies.

dPCC has been demonstrated with greater connectivity at rest with mPFC [90, 91]. Nevertheless, this connectivity is diminished in FMS [22]. Besides, DMN abnormality is associated with FMS [92] and chronic back pain [93]. At the same time, it has been suggested that greater activation of DMN helps people mind-wander away from pain [94]. Thus, we speculate that integrity of the DMN is necessary for ongoing cognitive modulation on pain processing and that its dysfunction may jeopardize nociception.

5. Limitations

Our study is based on meta-analytic approach with several inherent limitations. First, despite rigorous literature search, we included only 7 studies in the final analysis due to exclusion of those studies using ROI method and those without providing coordinates. In addition, our results may be subject to publication bias. Those with negative finding are less often published. Second, these included VBM studies are varied in their methods, such as difference in preprocessing steps (traditional or optimized), smoothing kernels, and statistical threshold. Besides, inclusion and exclusion criteria differ across the studies. This may also influence the individual result. Third, FMS is a complex disease itself with multiple comorbidities. A recent study found that each symptom dimension in FMS was related to a specific brain morphological change [57]. Another recent database research demonstrated a bidirectional association between FMS and depression [95]. We did not exclude those comorbid with depression specifically. Indeed, our result revealed GM decreases in mPFC, a common region reported both in depression [96, 97] and FMS [54, 56] research. As most pain related brain imaging studies, we cannot ascertain this structural change related to depression or pain itself [98]. In the same vein, to answer the question whether the GM decreases is a consequence of illness or the cause of the illness is out of the scope by current study design. Chronic nociceptive stimulus is thought as a cause for GM decreases [99] as some evidences have displayed correlation between pain duration [25]. Still, more longitudinal cohort studies are needed to disentangle this problem.

6. Conclusions

In conclusion, current meta-analytic results indicate the decrease gray matter volume in left mPFC and right dPCC in patients of FMS. These two areas are related to cognitive, affective, and nonaffective components of pain processing, supporting the notion of central sensitization theory of FMS. In addition, mPFC and right dPCC are also deeply linked with the default mode network. Thus, beside the areas of the typical “pain matrix,” such as insula or anterior cingulate gyrus, our results may shed light on other area of the same importance and provide insight over future research on the mechanism of fibromyalgia.

Disclosure

The funders did not play any role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing Interests

The authors declare no conflict of interests.

Authors’ Contributions

Chemin Lin, Shwu-Hua Lee, and Hsu-Huei Weng conceived the study design, Chemin Lin and Hsu-Huei Weng conducted the experiments, Chemin Lin wrote the paper, and Hsu-Huei Weng reviewed the analysis. All authors reviewed the manuscript.

Acknowledgments

This work was supported by the Medical Research Grants from Chang Gung Memorial Hospital (CMRPG3C0043) to Chemin Lin.

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Copyright © 2016 Chemin Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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