title: Expression of guanylin and uroguanylin mRNA in human nasal mucosa and nasal polyps.
abstract: OBJECTIVE
  Guanylin and uroguanylin are small, heat-stable peptides that were originally isolated from the small intestine and from urine, respectively. Functionally, it has been proposed that these peptides can regulate ion and water transport in various fluid-transporting epithelia. In the present study we evaluated the presence of mRNAs for human guanylin and uroguanylin in human inferior turbinate mucosa and nasal polyps.
  
  
  METHODS
  The expression and localization of mRNAs for both peptides were investigated in inferior turbinate tissues and nasal polyps using reverse transcriptase polymerase chain reaction and in situ hybridization.
  
  
  RESULTS
  mRNAs for both peptides were detected in human turbinate mucosa and nasal polyps. In situ hybridization revealed that they were localized in the epithelial layer and submucosal glands of inferior turbinate mucosa and in the epithelial layer of nasal polyps. However, their expression was noted at low levels in the superficial epithelium of nasal polyps, compared with that of inferior turbinate mucosa.
  
  
  CONCLUSIONS
  These results indicate that guanylin and uroguanylin in the nasal mucosa may participate in normal physiological processes, but also suggest that altered expression of these genes in nasal polyps may cause impaired electrolyte and water transport across the epithelial cells.
authors.affiliation: Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Korea University, Seoul, South Korea. sanghag@kumc.or.kr
authors.forename: Sang Hag
authors.initials: SH
authors.lastname: Lee
authors.forename: Jae Pil
authors.initials: JP
authors.lastname: Paeng
authors.forename: Hak Hyun
authors.initials: HH
authors.lastname: Jung
authors.forename: Seung Hoon
authors.initials: SH
authors.lastname: Lee
authors.forename: Heung Man
authors.initials: HM
authors.lastname: Lee
authors.forename: Soon Young
authors.initials: SY
authors.lastname: Kwon
authors.forename: Ki Jung
authors.initials: KJ
authors.lastname: Lim
authors.forename: Kwang Yoon
authors.initials: KY
authors.lastname: Jung
mesh_terms: D000328:Adult; D005260:Female; D005768:Gastrointestinal Hormones / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D017403:In Situ Hybridization; D008297:Male; D009297:Nasal Mucosa / Q000378:metabolism*; D009298:Nasal Polyps / Q000378:metabolism*; D045265:Natriuretic Peptides; D010455:Peptides / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014420:Turbinates
chemical_list: D005768:Gastrointestinal Hormones; D045265:Natriuretic Peptides; D010455:Peptides; D012333:RNA, Messenger; C072685:guanylin; C084362:uroguanylin