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Give me a pain that I am used to: distinct habituation patterns to painful and non-painful stimulation.

ABSTRACT: Pain habituation is associated with a decrease of activation in brain areas related to pain perception. However, little is known about the specificity of these decreases to pain, as habituation has also been described for other responses like spinal reflexes and other sensory responses. Thus, it might be hypothesized that previously reported reductions in activation are not specifically related to pain habituation. For this reason, we performed a 3 T fMRI study using either painful or non-painful electrical stimulation via an electrode attached to the back of the left hand. Contrasting painful vs. non-painful stimulation revealed significant activation clusters in regions well-known to be related to pain processing, such as bilateral anterior and posterior insula, primary/secondary sensory cortices (S1/S2) and anterior midcingulate cortex (aMCC). Importantly, our results show distinct habituation patterns for painful (in aMCC) and non-painful (contralateral claustrum) stimulation, while similar habituation for both types of stimulation was identified in bilateral inferior frontal gyrus (IFG) and contralateral S2. Our findings thus distinguish a general habituation in somatosensory processing (S2) and reduced attention (IFG) from specific pain and non-pain related habituation effects where pain-specific habituation effects within the aMCC highlight a change in affective pain perception.

SUBMITTER: Paul K

PROVIDER: S-EPMC8617189 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Double-Cone Coil TMS Stimulation of the Medial Cortex Inhibits Central Pain Habituation.

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Functional Spectroscopy Mapping of Pain Processing Cortical Areas During Non-painful Peripheral Electrical Stimulation of the Accessory Spinal Nerve.

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Human intracranial recordings reveal distinct cortical activity patterns during invasive and non-invasive vagus nerve stimulation.

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The transcriptomic signature of painful and non-painful human NF2 schwannomas

Project description:This SuperSeries is composed of the SubSeries listed below.

2020-05-01 | GSE138347 | GEO

Painful Bladder Filling and Painful Urgency are Distinct Characteristics in Men and Women with Urological Chronic Pelvic Pain Syndromes: A MAPP Research Network Study.

Project description:PurposeWe describe bladder associated symptoms in patients with urological chronic pelvic pain syndromes. We correlated these symptoms with urological, nonurological, psychosocial and quality of life measures.Materials and methodsStudy participants included 233 women and 191 men with interstitial cystitis/bladder pain syndrome or chronic prostatitis/chronic pelvic pain syndrome in a multicenter study. They completed a battery of measures, including items asking whether pain worsened with bladder filling (painful filling) or whether the urge to urinate was due to pain, pressure or discomfort (painful urgency). Participants were categorized into 3 groups, including group 1-painful filling and painful urgency (both), 2-painful filling or painful urgency (either) and 3-no painful filling or painful urgency (neither).ResultsOf the men 75% and of the women 88% were categorized as both or either. These bladder characteristics were associated with more severe urological symptoms (increased pain, frequency and urgency), a higher somatic symptom burden, depression and worse quality of life (3-group trend test each p<0.01). A gradient effect was observed across the groups (both>either>neither). Compared to those in the neither group men categorized as both or either reported more frequent urological chronic pelvic pain syndrome symptom flares, catastrophizing and irritable bowel syndrome, and women categorized as both or either were more likely to have a negative affect and chronic fatigue syndrome.ConclusionsMen and women with bladder symptoms characterized as painful filling or painful urgency had more severe urological symptoms, more generalized symptoms and worse quality of life than participants who reported neither characteristic, suggesting that these symptom characteristics might represent important subsets of patients with urological chronic pelvic pain syndromes.

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Sub-optimal presentation of painful facial expressions enhances readiness for action and pain perception following electrocutaneous stimulation.

Project description:Observation of others' painful facial expressions has been shown to facilitate behavioral response tendencies and to increase pain perception in the observer. However, in previous studies, expressions were clearly visible to the observer and none of those studies investigated the effect of presence of peripheral stimulation on response tendencies. This study focuses on the effect of sub-optimal presentation of painful facial expressions in the presence and absence of an electrocutaneous stimulus. Twenty-two healthy individuals categorized arrow targets which were preceded by a sub-optimally presented facial expression (painful, happy, or neutral in different blocks). On half of the trials, aversive electrocutaneous stimulation was delivered to the wrist of the non-dominant hand between the presentation of facial expression and target (an arrow directing to right or left). Participants' task was to indicate direction of the arrow as soon as it appears on the screen by pressing the corresponding key on the keyboard and to rate their pain at the end of block. Analysis showed that responses were faster to targets preceded by aversive stimulation than to targets not preceded by stimulation, especially following painful expressions. Painfulness ratings were higher following painful expressions than following happy expressions. These findings suggest that sub-optimally presented painful expressions can enhance readiness to act to neutral, non-pain-related targets after aversive stimulation and can increase pain perception.

| S-EPMC4493322 | biostudies-literature

The transcriptomic signature of painful and non-painful human NF2 schwannomas [set2]

Project description:Schwannomas are benign peripheral nerve sheath tumors that are associated with substantial morbidity including severe, persistent pain. Treatment, essentially limited to surgical resection, is associated with significant morbidity and for many patient’s efficacious treatment of tumor-related pain is not achievable. There is an urgent need to elucidate the molecular mechanisms underlying schwannoma-induced pain as a first step in development of new therapeutics. In this study, we performed next-generation RNASequencing on a small cohort of formalin fixed paraffin-embedded, painful, and non-painful schwannoma samples obtained from Neurofibromatosis type 2 (NF2) patients. Differential gene and isoform level expression analysis revealed significant transcriptomic differences between painful and non-painful tumors; differentially regulated genes included members of the fibroblast growth factor (FGF) family of genes. Using a xenograft model of human-NF2 we demonstrated that over-expression of FGF7 in schwannoma cells was associated with the development of pain-like behaviors. These results demonstrate both the value of RNASeq utilizing formalin fixed tissues and reveal a novel pathway responsible for neoplasm-associated pain.

2020-05-01 | GSE138346 | GEO

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