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Frontiers in Neuroscience 2023The central and peripheral nervous systems provide cholinergic innervation in the colon. The ability to assess their neuroanatomical distinctions is still a challenge....
INTRODUCTION
The central and peripheral nervous systems provide cholinergic innervation in the colon. The ability to assess their neuroanatomical distinctions is still a challenge. The pig is regarded as a relevant translational model due to the close similarity of its enteric nervous system (ENS) with that of human. Opioid-induced constipation is one of the most common side effects of opioid therapy.
METHODS
We developed an approach to differentiate the central and peripheral cholinergic innervation of the pig colon using double immunolabeling with a novel mouse anti-human peripheral type of choline acetyltransferase (hpChAT) antibody combined with a rabbit anti-common type of ChAT (cChAT) antibody, a reliable marker of cholinergic neurons in the central nervous system. We examined their spatial configurations in 3D images of the ENS generated from CLARITY-cleared colonic segments. The density was quantitated computationally using Imaris 9.7. We assessed changes in the distal colon induced by daily oral treatment for 4 weeks with the μ opioid receptor agonist, loperamide (0.4 or 3 mg/kg).
RESULTS
The double labeling showed strong cChAT immunoreactive (ir) fibers in the cervical vagus nerve and neuronal somata and fibers in the ventral horn of the sacral (S2) cord while hpChAT immunoreactivity was visualized only in the ENS but not in the vagus or sacral neural structures indicating the selectivity of these two antibodies. In the colonic myenteric plexus, dense hpChAT-ir neurons and fibers and varicose cChAT-ir fibers surrounding hpChAT-ir neurons were simultaneously visualized in 3D. The density of cChAT-ir varicose fibers in the outer submucosal plexus of both males and females were higher in the transverse and distal colon than in the proximal colon and in the myenteric plexus compared to the outer submucosal plexus and there was no cChAT innervation in the inner submucosal plexus. The density of hpChAT in the ENS showed no segmental or plexus differences in both sexes. Loperamide at the highest dose significantly decreased the density hpChAT-ir fibers + somata in the myenteric plexus of the distal colon.
DISCUSSION
These data showed the distinct density of central cholinergic innervation between myenteric and submucosal plexuses among colonic segments and the localization of cChAT-ir fibers around peripheral hpChAT neurons in 3D. The reduction of cholinergic myenteric innervation by chronic opiate treatment points to target altered prokinetic cholinergic pathway to counteract opiate constipation.
PubMed: 37650102
DOI: 10.3389/fnins.2023.1204233 -
Journal of Crohn's & Colitis Jan 2024Pain is a cardinal symptom in inflammatory bowel disease [IBD]. An important structure in the transduction of pain signalling is the myenteric plexus [MP]. Nevertheless,...
BACKGROUND AND AIMS
Pain is a cardinal symptom in inflammatory bowel disease [IBD]. An important structure in the transduction of pain signalling is the myenteric plexus [MP]. Nevertheless, IBD-associated infiltration of the MP by immune cells lacks in-depth characterisation. Herein, we decipher intra- and periganglionic immune cell infiltrations in Crohn´s disease [CD] and ulcerative colitis [UC] and provide a comparison with murine models of colitis.
METHODS
Full wall specimens of surgical colon resections served to examine immune cell populations by either conventional immuno-histochemistry or immunofluorescence followed by either bright field or confocal microscopy. Results were compared with equivalent examinations in various murine models of intestinal inflammation.
RESULTS
Whereas the MP morphology was not significantly altered in IBD, we identified intraganglionic IBD-specific B cell- and monocyte-dominant cell infiltrations in CD. In contrast, UC-MPs were infiltrated by CD8+ T cells and revealed a higher extent of ganglionic cell apoptosis. With regard to the murine models of intestinal inflammation, the chronic dextran sulphate sodium [DSS]-induced colitis model reflected CD [and to a lesser extent UC] best, as it also showed increased monocytic infiltration as well as a modest B cell and CD8+ T cell infiltration.
CONCLUSIONS
In CD, MPs were infiltrated by B cells and monocytes. In UC, mostly CD8+ cytotoxic T cells were found. The chronic DSS-induced colitis in the mouse model reflected best the MP-immune cell infiltrations representative for IBD.
Topics: Animals; Mice; Colitis, Ulcerative; Crohn Disease; Myenteric Plexus; Inflammatory Bowel Diseases; Colitis; Neurotransmitter Agents; Pain; Inflammation
PubMed: 37565754
DOI: 10.1093/ecco-jcc/jjad122 -
Nature Communications Aug 2023Achalasia is a rare motility disorder of the esophagus caused by the gradual degeneration of myenteric neurons. Immune-mediated ganglionitis has been proposed to...
Achalasia is a rare motility disorder of the esophagus caused by the gradual degeneration of myenteric neurons. Immune-mediated ganglionitis has been proposed to underlie the loss of myenteric neurons. Here, we measure the immune cell transcriptional profile of paired lower esophageal sphincter (LES) tissue and blood samples in achalasia and controls using single-cell RNA sequencing (scRNA-seq). In achalasia, we identify a pattern of expanded immune cells and a specific transcriptional phenotype, especially in LES tissue. We show C1QC macrophages and tissue-resident memory T cells (T), especially ZNF683 CD8 T and XCL1 CD4 T, are significantly expanded and localized surrounding the myenteric plexus in the LES tissue of achalasia. C1QC macrophages are transcriptionally similar to microglia of the central nervous system and have a neurodegenerative dysfunctional phenotype in achalasia. T also expresses transcripts of dysregulated immune responses in achalasia. Moreover, inflammation increases with disease progression since immune cells are more activated in type I compared with type II achalasia. Thus, we profile the immune cell transcriptional landscape and identify C1QC macrophages and T as disease-associated immune cell subsets in achalasia.
Topics: Humans; Esophageal Achalasia; Esophageal Sphincter, Lower; Neurons; Inflammation; Macrophages
PubMed: 37542039
DOI: 10.1038/s41467-023-39750-5 -
Revista Espanola de Enfermedades... Jun 2024We are grateful our case has aroused such interest from our Turkish colleagues, and we thank them for their kind reply. Sigmoid volvulus (SV) is the third leading cause...
We are grateful our case has aroused such interest from our Turkish colleagues, and we thank them for their kind reply. Sigmoid volvulus (SV) is the third leading cause of colonic obstruction in the world. Is it widely known there is a progressive aging of the population. Prevention with lifestyle habits and early treatment of cardiovascular risk factors has led to an increase of pluripatologic chronic conditions. A higher incidence of neurodegenerative diseases is also a proven fact. Their intestinalinvolvementcan be ina direct form, withneuronal destruction in myenteric plexus leading to chronic constipation, and alsodue to secondary drug effects (laxatives causing fecal overloading, increased intracolonic pressure, dolichocolon…), all favouringweakness in colonic wall, and therefore the appearance of sigmoid volvulus. We don´t have specific data about SV incidence and recurrence in our centre.However, literature reviews show recurrence is the norm in the majority of cases after colonic decompression. Data reported from our colleagues in Turkey represents a single centre cohort and a broad spectrum over time (from 1960s until now), so recurrence rate should not be generalized to global population. The continuous improvement in endoscopic procedures since their beginning might have despair results of colonic decompression and need of surgery among years. Nowadays we have more sophisticated and high-resolution endoscopes, as well as better trained endoscopists with more advanced therapeutic techniques. This might overlap with surgical development of less invasive techniques, lower rates of complication and shorter postoperative recovery. We suggest the authors to examin in their database the different outcomes through decades in their cohort since we believe medical/endoscopic/surgical approach has changed from 1960s until now. Finally, we agree elective surgery must be the final treatment in SV cases with American Society of Anesthesiologists (ASA) scores 1-3. Endoscopic or laparoscopic colopexychoice for ASA > 3 patients should be made based on each centre´s experience. We believe endoscopic approach with endoscopic colostomy or sigmoidopexy might be the first approach for fragile patients since it is an easily performed technique, with low rate of complications and acceptable long-term results preventing a recurrence of SV. Further studies are needed to compare minimally invasive surgery to endoscopic approach.
Topics: Humans; Intestinal Volvulus; Sigmoid Diseases; Decompression, Surgical; Recurrence
PubMed: 37539528
DOI: 10.17235/reed.2023.9880/2023 -
Journal of Neurogastroenterology and... Oct 2023Multiple sclerosis (MS) is an inflammatory disease characterized by the demyelination of primarily the central nervous system. Diffuse esophageal spasm (DES) and...
BACKGROUND/AIMS
Multiple sclerosis (MS) is an inflammatory disease characterized by the demyelination of primarily the central nervous system. Diffuse esophageal spasm (DES) and achalasia are both disorders of esophageal peristalsis which cause clinical symptoms of dysphagia. Mechanisms involving dysfunction of the pre- and post-ganglionic nerve fibers of the myenteric plexus have been proposed. We sought to determine whether MS confers an increased risk of developing achalasia or DES.
METHODS
Cohort analysis was done using the Explorys database. Univariate logistic regression was performed to determine the odds MS confers to each motility disorder studied. Comparison of proportions of dysautonomia comorbidities was performed among the cohorts. Patients with a prior diagnosis of diabetes mellitus, chronic Chagas' disease, opioid use, or CREST syndrome were excluded from the study.
RESULTS
Odds of MS patients developing achalasia or DES were (OR, 2.09; 95% CI, 1.73-2.52; < 0.001) and (OR, 3.15; 95% CI, 2.89-3.42; < 0.001), respectively. In the MS/achalasia cohort, 27.27%, 18.18%, 9.09%, and 45.45% patients had urinary incontinence, gastroparesis, impotence, and insomnia, respectively. In the MS/DES cohort, 35.19%, 11.11%, 3.70%, and 55.56% had these symptoms. In MS patients without motility disorders, 12.64%, 0.79%, 2.21%, and 21.85% had these symptoms.
CONCLUSIONS
Patients with MS have higher odds of developing achalasia or DES compared to patients without MS. MS patients with achalasia or DES have higher rates of dysautonomia comorbidities. This suggests that these patients have a more severe disease phenotype in regards to the extent of neuronal degradation and demyelination causing the autonomic dysfunction.
PubMed: 37528077
DOI: 10.5056/jnm22173 -
Biomolecules Jun 2023Mutations in the Neuroligin-3 () gene are implicated in autism spectrum disorder (ASD) and gastrointestinal (GI) dysfunction, but cellular expression in the enteric...
Quantitative Spatial Analysis of Neuroligin-3 mRNA Expression in the Enteric Nervous System Reveals a Potential Role in Neuronal-Glial Synapses and Reduced Expression in Mice.
Mutations in the Neuroligin-3 () gene are implicated in autism spectrum disorder (ASD) and gastrointestinal (GI) dysfunction, but cellular expression in the enteric nervous system remains to be characterised. We combined RNAScope in situ hybridization and immunofluorescence to measure mRNA expression in cholinergic and VIP-expressing submucosal neurons, nitrergic and calretinin-containing myenteric neurons and glial cells in both WT and mutant mice. We measured mRNA neuronal and glial expression via quantitative three-dimensional image analysis. To validate dual RNAScope/immunofluorescence data, we interrogated available single-cell RNA sequencing (scRNASeq) data to assess for , , and their binding partners, , and , in enteric neural subsets. Most submucosal and myenteric neurons expressed mRNA. In contrast to other and binding partners, was strongly expressed in enteric glia, suggesting a role for neuroligin-3 in mediating enteric neuron-glia interactions. The autism-associated R451C mutation reduces mRNA expression in cholinergic but not in VIPergic submucosal neurons. In the myenteric plexus, mRNA levels are reduced in calretinin, nNOS-labelled neurons and S100 β -labelled glia. We provide a comprehensive cellular profile for neuroligin-3 expression in ileal neuronal subpopulations of mice expressing the R451C autism-associated mutation in which may contribute to the understanding of the pathophysiology of GI dysfunction in ASD.
Topics: Mice; Animals; Calbindin 2; Autism Spectrum Disorder; Neurons; Neuroglia; Enteric Nervous System; Synapses; Cholinergic Agents
PubMed: 37509099
DOI: 10.3390/biom13071063 -
The American Surgeon Nov 2023Eosinophilic myenteric ganglionitis (EMG) is a rare pathologic finding within the Auerbach myenteric plexus characterized by eosinophilic infiltration on light...
Eosinophilic myenteric ganglionitis (EMG) is a rare pathologic finding within the Auerbach myenteric plexus characterized by eosinophilic infiltration on light microscopy. The plexus's ultimate obliteration results in chronic intestinal pseudo-obstruction (CIPO). EMG is almost exclusively seen in the pediatric population. The diagnosis of EMG is made through full-thickness rectal biopsy and EMG is not detectable through routine screening measures such as imaging or colonoscopy. The current treatment modality for this disorder is not standardized, and has often been treated with systemic steroids given its eosinophilic involvement. This case presents a 73-year-old male with chronic constipation presenting with new obstipation in the setting of recent orthopedic intervention requiring outpatient opioids. Admission radiographs were consistent with sigmoid volvulus. Following endoscopic detorsion, exploratory laparotomy revealed diffuse colonic dilation and distal ischemia requiring a Hartmann's procedure. Surgical pathology revealed EMG, increasing the complexity of subsequent surgical decision-making after his urgent operation.
Topics: Male; Humans; Child; Aged; Intestinal Volvulus; Colon; Intestinal Pseudo-Obstruction; Myenteric Plexus; Colonoscopy; Sigmoid Diseases
PubMed: 37501639
DOI: 10.1177/00031348231191198 -
Animals : An Open Access Journal From... Jun 2023Energy deficiency causes multiple organ dysfunctions after LPS induction. Quercetin is a phenolic compound found in herbal medicines. However, the effects of quercetin...
Energy deficiency causes multiple organ dysfunctions after LPS induction. Quercetin is a phenolic compound found in herbal medicines. However, the effects of quercetin in alleviating LPS-induced energy deficiency remain unclear. In the present study, an in vivo LPS-induced inflammation model was established in chicken embryos. Specific pathogen-free chicken embryos (n = 120) were allocated to control, PBS with or without ethanol, quercetin (10, 20, or 40 nmol, respectively), and LPS (125 ng/egg) with or without quercetin groups. Fifteen day old embryonated eggs were injected with the abovementioned solutions via the allantoic cavity. On embryonic day 19, the tissues of the embryos were collected for histopathological examination using frozen oil red O staining, RNA extraction, real-time quantitative polymerase chain reaction, and immunohistochemical investigations. The glycogen and lipid contents in the liver increased after LPS stimulation as compared with the PBS group, whereas quercetin decreased the accumulation as compared with the LPS group. The mRNA expressions of AMPKα1 and AMPKα2 in the duodena, ceca, and livers were upregulated after LPS induction as compared with the PBS group, while quercetin could downregulate these expressions as compared with the LPS group. The immunopositivity of AMPKα2 in the villus, crypt, lamina propria, tunica muscularis, and myenteric plexus in the duodena and in the cytoplasms of hepatocytes significantly increased after LPS induction when compared with the PBS group ( < 0.01), whereas the immunopositivity to AMPKα2 in the quercetin treatment group significantly decreased when compared with the LPS group ( < 0.01 or < 0.05). The LPS-induced high expressions of transcription factor PPARα and glucose transporter (SGLT1) were blocked by quercetin in the duodena, ceca, and livers. Quercetin treatment improved the LPS-induced decrease in APOA4 in the duodena, ceca, and livers. The mRNA expression of PEPT1 in the duodena and ceca increased after LPS challenge, whereas quercetin could downregulate PEPT1 gene expression. These data demonstrate that quercetin improved the energy deficiency induced by LPS in chicken embryos. The LPS-induced inflammation model was established to avoid the effect of LPS exposure from the environment and intestinal flora. The results form the basis the administration of quercetin pretreatment (in ovo infection) to improve the energy state of chicken embryos and improve the inflammation response.
PubMed: 37443849
DOI: 10.3390/ani13132051 -
Translational Pediatrics Jun 2023Hypoganglionosis resembles Hirschsprung's disease as in both diseases, patients may present with severe constipation or pseudo-obstruction. To date, diagnosis of...
BACKGROUND
Hypoganglionosis resembles Hirschsprung's disease as in both diseases, patients may present with severe constipation or pseudo-obstruction. To date, diagnosis of hypoganglionosis is still difficult to be established due to lack of international consensus regarding diagnostic criteria. This study aims to evaluate the use of immunohistochemistry to provide objective support for our initial subjective impression of hypoganglionosis as well as to describe the morphological features of this study.
METHODS
This is a cross-sectional study. Three resected intestinal samples from patients with hypoganglionosis at Kyushu University Hospital, Fukuoka, Japan were included in this study. One healthy intestinal sample was used as control. All specimens were immunohistochemically stained with anti-S-100 protein, anti-α-smooth muscle actin (α-SMA), and anti-c-kit protein antibodies.
RESULTS
(I) S-100 immunostaining: hypoplasia of the myenteric ganglia and marked reduction of intramuscular nerve fibers were observed in several segments of the intestine. (II) α-SMA immunostaining: the pattern of the muscular layers was almost normal in all segments; however, some areas showed hypotrophy of the circular muscle (CM) layers and hypertrophy of the longitudinal muscle (LM) layers. (III) C-kit immunostaining: a decreased in the number of interstitial cells of Cajal (ICCs) was observed in almost all segments of the resected intestine, even around the myenteric plexus.
CONCLUSIONS
Each segment of intestine in hypoganglionosis had different numbers of ICCs, sizes, and distributions of ganglions, as well as patterns of musculature, which may range from severely abnormal to nearly normal. Further investigations regarding the definition, etiology, diagnosis, and treatment of this disease should be performed to improve the prognosis of this disease.
PubMed: 37427059
DOI: 10.21037/tp-22-592 -
Folia Medica Cracoviensia Apr 2023Anorexia nervosa (AN) is an eating disorder characterized by distinct etiopathogenetic concepts that are gradually being linked together to unravel the dominant...
Anorexia nervosa (AN) is an eating disorder characterized by distinct etiopathogenetic concepts that are gradually being linked together to unravel the dominant pathophysiological pathways underlying the disease. Excessive food restrictions, often accompanied by over-exercise and undertaken to lose weight, lead to the development of numerous complications. The biological concept of neurohormonal dysfunction in AN seems incomplete without demonstrating or excluding the role of the enteric nervous system (ENS). Using an animal model of activity-based anorexia (ABA), we conducted the preliminary assessment of the ENS structure. Here we show, in preparations stained by immunohistochemistry with anti- ChAT, anti-NOS, anti-PGP 9.5, anti-c-fos, and anti-TH antibodies, a lower density of cholinergic and nitrergic nerve fibers as well as reduced neuronal activity in myenteric plexus. Such structural and functional damage to the ENS may be responsible for a number of gastrointestinal symptoms that worsen the course of the disease. In addition, we expanded the study to address the unresolved issue of mechanical and thermal pain sensitivity in AN. The Von Frey and hot plate tests revealed, that in ABA animals, the pain threshold for mechanical stimulus decreases while for thermal increases. In this way, we have significantly supplemented the background of AN with potentially observable nervous system changes which may influence the evolution of the therapeutic approach in the future.
Topics: Animals; Anorexia; Enteric Nervous System; Pain Perception; Models, Animal; Pain
PubMed: 37406277
DOI: 10.24425/fmc.2023.145430