title: Abnormal distribution of sarcoglycan subcomplex in colonic smooth muscle cells of aganglionic bowel.
abstract: Hirschsprung's disease (HD) is a development disorder of the enteric nervous system in which the altered innervation explains the inability of the aganglionic segment to relax. Impairment of cytoskeleton in SMC of aganglionic bowel has been shown. Sarcoglycan subcomplex (SG) may support the development and maintenance of muscle cells. We examined the SG subunit expression in colonic aganglionic and ganglionic specimens obtained from patients with HD. Full-thickness bowel specimens were obtained from six patients with HD. Six normal colon specimens were used as controls. Immunofluorescent analysis and reverse transcriptase polymerase chain reaction evaluation were performed for alpha-, beta-, gamma-, delta- and epsilon-SG. In control colon, the indirect immunofluorescence showed a strong staining pattern of beta- gamma- delta- and epsilon-SG while a weak positivity of alpha-SG was recorded. In aganglionic bowel, immunofluorescence intensity values documented a significant lack of epsilon-SG while an enhanced alpha-SG, coupled to a loss of epsilon-SG, was recorded in ganglionic bowel in HD-affected patients. Our observations underscore the assumption that non-neuronal elements of the colon might play a key role in the pathogenesis of HD and loss of epsilon-SG might critically alter the cytoskeleton in the aganglionic bowel segment. Up-regulation of alpha-SG is probably an acquired phenomenon to reinforce the sarcolemma and to perform a forceful contraction in dilated ganglionic HD-affected colon, related to chronic pseudo-obstruction, contributing to the intestinal dysmotility that persists in 20% of patients after resection of the aganglionic bowel.
authors.affiliation: Department of Pediatric Surgery, Unit of Pediatric Surgery, University of Catania, Vittorio Emanuele Hospital, 95124 Catania, Italy.
authors.forename: Salvatore
authors.initials: S
authors.lastname: Arena
authors.forename: Giuseppina
authors.initials: G
authors.lastname: Cutroneo
authors.forename: Angelo
authors.initials: A
authors.lastname: Favaloro
authors.forename: Maria Teresa
authors.initials: MT
authors.lastname: Sinatra
authors.forename: Fabio
authors.initials: F
authors.lastname: Trimarchi
authors.forename: Silvia
authors.initials: S
authors.lastname: Scarvaglieri
authors.forename: Agostino
authors.initials: A
authors.lastname: Mallamace
authors.forename: Francesco
authors.initials: F
authors.lastname: Arena
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Anastasi
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Di Benedetto
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003106:Colon / Q000294:innervation / Q000378:metabolism / Q000473:pathology; D017615:Enteric Nervous System / Q000033:anatomy & histology / Q000473:pathology; D006627:Hirschsprung Disease / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D007223:Infant; D009119:Muscle Contraction / Q000502:physiology; D032389:Myocytes, Smooth Muscle / Q000166:cytology / Q000378:metabolism*; D021122:Protein Subunits / Q000235:genetics / Q000378:metabolism*; D049031:Sarcoglycans / Q000235:genetics / Q000378:metabolism*
chemical_list: D021122:Protein Subunits; D049031:Sarcoglycans