title: Altered regulation of cell surface peptidases in human cholesteatoma.
abstract: Cholesteatoma is a destructive process involving an accumulation of desquamated keratin arising from squamous epithelium that pathologically has invaded the middle ear or mastoid process. The clinical hallmarks of cholesteatomas, namely invasion of healthy tissues, migration, unrestrained proliferation, aggressiveness, recidivism, and uncoordinated differentiation predict the existence of defects in the normal biology and biochemistry of the cellular constituents that compose a cholesteatoma, as well as in the cellular interactions between these cells, the surrounding normal tissue, and the host. In the current report, we analyzed 11 cholesteatomas and matched healthy tissue for altered expression in four different cell surface peptidases, aminopeptidase A, aminopeptidase N, dipeptidyl peptidase IV, and neutral endopeptidase. We suggest that peptidases may modulate cell growth and differentiation by inactivating stimulatory signals (or conversely, by activating inhibitory signals).
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Manhattan Eye, Ear, and Throat Hospital, New York, NY 10021, USA.
authors.forename: R B
authors.initials: RB
authors.lastname: Desloge
authors.forename: C L
authors.initials: CL
authors.lastname: Finstad
authors.forename: J
authors.initials: J
authors.lastname: Sassoon
authors.forename: J C
authors.initials: JC
authors.lastname: Han
authors.forename: S C
authors.initials: SC
authors.lastname: Parisier
authors.forename: A P
authors.initials: AP
authors.lastname: Albino
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000626:Aminopeptidases / Q000378:metabolism; D000911:Antibodies, Monoclonal; D018826:CD13 Antigens / Q000378:metabolism; D002648:Child; D002675:Child, Preschool; D018424:Cholesteatoma, Middle Ear / Q000378:metabolism* / Q000473:pathology; D018819:Dipeptidyl Peptidase 4 / Q000378:metabolism; D005260:Female; D043384:Glutamyl Aminopeptidase; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism*; D008875:Middle Aged; D015260:Neprilysin / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D008565:Membrane Proteins; D000626:Aminopeptidases; D018826:CD13 Antigens; D043384:Glutamyl Aminopeptidase; D018819:Dipeptidyl Peptidase 4; D015260:Neprilysin