title: Interstitial cells of cajal in reflux esophagitis: role in the pathogenesis of the disease.
abstract: BACKGROUND
  Interstitial cells of Cajal (ICCs) are claimed to be involved in gut electromotor activity. We investigated whether absent or diminished ICCs in the esophagogastric junction (EGJ) may be responsible for EGJ incompetence in gastro-esophageal reflux disease (GERD).
  
  
  METHODS
  Endoscopic specimens were obtained from the upper and mid third of the esophagus and from the EGJ of 29 patients (17 men, 12 women, mean age: 46.7 years) with GERD (5 grade A, 5 B, 6 C, and 13 D, Los Angeles classification) and from 8 controls. Sections were prepared for inmunohistochemical investigation using an ICC marker c-kit. Controls had normal rabbit serum substituted for the primary antiserum.
  
  
  RESULTS
  C-kit-positive branched ICC-like cells were detected in the esophageal and EGJ musculature of the controls. They were distinguishable from the c-kit-negative unbranched smooth muscle cells and from the c-kit-positive unbranched mast cells. Immunoreactivity was absent in the negative controls. ICCs in the esophageal body existed in GERD and in controls, but were absent from the EGJ of 12 patients (2 grade C, 10 D) and occasionally detected in 5 of group A, 5 of B, 4 of C, and 3 of group D patients.
  
  
  CONCLUSIONS
  ICCs were demonstrated in the esophageal body and EGJ of controls. In GERD patients they were detected in the esophageal body, but were deficient or absent in the EGJ. It is postulated that ICC absence or deficiency is responsible for EGJ incompetence and GER. The cause of ICC deficiency or absence needs to be investigated.
authors.affiliation: Department of Surgery and Experimental Research, Faculty of Medicine, Cairo University, Cairo, Egypt. shafik@ahmedshafik.com
authors.forename: Ahmed
authors.initials: A
authors.lastname: Shafik
authors.forename: Ismail
authors.initials: I
authors.lastname: Ahmed
authors.forename: Olfat
authors.initials: O
authors.lastname: El Sibai
authors.forename: Ali A
authors.initials: AA
authors.lastname: Shafik
mesh_terms: D000328:Adult; D004724:Endoscopy; D004942:Esophagitis, Peptic / Q000209:etiology* / Q000473:pathology; D004943:Esophagogastric Junction / Q000737:chemistry / Q000473:pathology*; D004947:Esophagus / Q000737:chemistry / Q000473:pathology*; D005260:Female; D005764:Gastroesophageal Reflux / Q000209:etiology* / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D019009:Proto-Oncogene Proteins c-kit / Q000032:analysis
chemical_list: D019009:Proto-Oncogene Proteins c-kit