cells of cajal
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2022 ◽  
pp. 1-6
Author(s):  
Yujie Huang ◽  
Meiling Gong ◽  
Xianshu Chen ◽  
Yijie Chen ◽  
Bikai Lu ◽  
...  

Interstitial cells of Cajal (ICC) play a vital role in the gastrointestinal motility. However, information on ICC in lower vertebrates is rare. Here, ICC and ICC-like features of the gastric wall in the bullfrog (Rana catesbeiana) were observed by light microscopy and transmission electron microscopy. The lengths and distances of the ICC/ICC-like features were measured by morphometric analysis. The gastric wall contained mucosa, submucosa, tunica muscularis, and serosa. The gastric glands contained mucous cells and oxynticopeptic cells. The ICC with 1–3 processes were located among smooth muscle cells (SMC) of the tunica muscularis. Moreover, the ICC-like features were observed among oxynticopeptic cells of the mucosa. The processes of ICC established direct contacts with SMC. Also, the gap junctions were observed between the processes of ICC and nerve fiber bundles in the tunica muscularis. The multivesicular bodies, including shedding exosomes, were frequently observed between ICC and SMC. In addition, ICC-like features and their processes were observed in close proximity to oxynticopeptic cells and blood vessels. Our findings illustrated that ICC are present in the gastric tunica muscularis, and ICC-like features were in the mucosal lamina propria of the gastric wall of R. catesbeiana. These histological evidences supported the notion that ICC are implicated in gastric motility.


Author(s):  
Zhen-peng Huang ◽  
Hu Qiu ◽  
Ke Wang ◽  
Jia-wei He ◽  
Hang Chen ◽  
...  

Author(s):  
Srijan Valasapalli ◽  
◽  
Sanjivani Sathe ◽  

Gastrointestinal stromal tumors (GISTs) are an uncommon malignancy, with origin in the interstitial cells of Cajal located in the myenteric plexus. The incidence is 5000 new cases every year in the US. It is important to determine genetic alterations in GIST. Approximately 90% of GISTs have a gain of function mutation in either the c-KIT protooncogene (which encodes for the receptor tyrosine kinase KIT) accounting for 75%, or the platelet derived growth factor receptor alpha (PDGFRA) protooncogene which accounts for 15%. Only 5-10% constitute Wild Type (WT) GISTs with mutations observed in BRAF, NF1, & SDH. While Imatinib, a Tyrosine Kinase Inhibitor (TKI), is used as adjuvant therapy for most KIT-positive tumors, it cannot be used in TKI-resistant tumors that harbor alternative genetic mutations. We present a rare case of quadruple negative (negative for all aforementioned genes) GIST with a mutation identified as ETV6-NTRK3 fusion. This mutation was first described in a case of rectal quadruple negative WT GIST.


2021 ◽  
Vol 108 (Supplement_9) ◽  
Author(s):  
VIBHA SINGH

Abstract Background Gastrointestinal stromal tumors are mesenchymal in origin, being derived from the interstitial cells of Cajal. These can be found anywhere in the gastrointestinal tract and are commonly found in the stomach followed by the small bowel. Gastrointestinal stromal tumors are usually asymptomatic and are often found incidentally. Chronic bleeding is one of the most common presentation. Gastrointestinal stromal tumors presenting with massive gastro intestinal haemorrhage and mimicking arteriovenous malformation on radiology are rare with only few cases reported. Methods Herein we present such a case of a 45-year-old gentleman with massive gastro intestinal bleeding. At presentation, patient was in congestive heart failure due to severe anaemia with a hemoglobin of 2.9g/dL. CECT Angiography localised the bleed to be from a jejunal mass lesion with radiological features consistent with those of arteriovenous malformation. Patient underwent laparoscopy assisted resection and anastomosis. Results Histopathology examination revealed a low risk jejunal gastrointestinal stromal tumor with no evidence of arteriovenous malformation. The mass was removed completely and the patient was discharged on 5th post-operative day. Patient was followed up in the out-patient department and was found to be doing well. Conclusions Gastrointestinal stromal tumors though relatively uncommon should be kept as important differentials for acute torrential gastrointestinal bleeding. It is highlighted that a presentation of gastrointestinal stromal tumors similar to that of arteriovenous malformations on cross sectional imaging should be kept in mind. The present case is reported in hope of expanding the knowledge of a rare occurrence, its aetiology, clinical impact and treatment.


2021 ◽  
Vol 2 (6) ◽  
pp. 5-9
Author(s):  
Seke Manase Ephraim Kazuma ◽  
Bright Chirengendure ◽  
Patrick Musonda ◽  
Joseph Musowoya ◽  
Royd Ngoma ◽  
...  

Gastrointestinal stromal tumors (GIST) account for 1% to 3% of gastrointestinal tract tumors and are the most common of the mesenchymal tumors. Carcinogenesis of GIST arises in the interstitial cells of Cajal (ICC) and in the myenteric plexus of the gastrointestinal tract due to a mutation of the kinase receptor (KIT, also known as CD117) and the platelet-derived growth factor A (PDGFA) gene leading to activation of the tyrosine kinase receptor. The exact incidence and prevalence of GIST is not known. Symptoms of GIST are non-specific; they present with GI bleeding due to ulceration (50%), abdominal pain (20% to 50%), dysphagia (esophageal GIST) and GI obstruction (10% to 30%) (7,10). Signs include abdominal mass and fullness. A computerized tomographic (CT) scan is the preferred imaging to evaluate GIST. Diagnosis is confirmed by immunohistochemical (IHC) staining a of biopsy sample for medical treatment tyrosine kinase inhibitors (TKI). Surgical resection with negative microscopic margins is the gold standard treatment of GIST. TKI are required for tumor reduction to increase chances of respectability (neoadjuvant therapy) or to prevent recurrence and reduce the progression of advanced, resectable GIST.


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