title: Immunocytochemical expression of parathyroid hormone related protein (PTHrP) in odontogenic jaw cysts.
abstract: OBJECTIVE
  To investigate the immunocytochemical expression of parathyroid-hormone-related protein (PTHrP) in odontogenic jaw cysts.
  
  
  METHODS
  Retrospective study of archival tissue.
  
  
  METHODS
  University department, UK.
  
  
  METHODS
  Odontogenic keratocysts (n=27), and dentigerous and radicular cysts (n=10 each).
  
  
  METHODS
  Immunocytochemistry by biotin streptavidin technique.
  
  
  METHODS
  Intensity of staining of PTHrP determined by TV image analysis.
  
  
  RESULTS
  The epithelial linings of all the odontogenic keratocysts, 9/10 dentigerous, and 8/10 radicular cysts showed reactivity for PTHrP mainly localised to the basal and suprabasal layers. Odontogenic keratocyst linings expressed significantly higher levels of PTHrP than those of dentigerous and radicular cysts (P<0.003 in each case). There were no differences in epithelial expression of PTHrP between solitary, recurrent and naevoid basal cell carcinoma syndrome-associated odontogenic keratocysts. The fibrous tissue walls of all types of cyst reacted strongly for PTHrP with a trend towards decreasing intensity from odontogenic keratocysts, to dentigerous and then radicular cysts.
  
  
  CONCLUSIONS
  It is possible that PTHrP modulates growth and bone resorption in odontogenic cysts. PTHrP may act synergistically with interleukin-1 to increase bone resorption or stimulate osteoblasts and inhibit osteoclasts (resulting in reduced resorption) via its transforming growth factor beta-like activity.
authors.affiliation: Department of Oral Pathology, Kagoshima University Dental School, Japan.
authors.forename: T J
authors.initials: TJ
authors.lastname: Li
authors.forename: R M
authors.initials: RM
authors.lastname: Browne
authors.forename: J B
authors.initials: JB
authors.lastname: Matthews
mesh_terms: D000704:Analysis of Variance; D001478:Basal Cell Nevus Syndrome / Q000378:metabolism; D003803:Dentigerous Cyst / Q000737:chemistry; D006801:Humans; D007124:Immunoenzyme Techniques; D009363:Neoplasm Proteins / Q000032:analysis; D009807:Odontogenic Cysts / Q000737:chemistry*; D010281:Parathyroid Hormone / Q000032:analysis; D044162:Parathyroid Hormone-Related Protein; D011506:Proteins / Q000032:analysis*; D011842:Radicular Cyst / Q000737:chemistry; D012189:Retrospective Studies; D018709:Statistics, Nonparametric
chemical_list: D009363:Neoplasm Proteins; C470121:PTHLH protein, human; D010281:Parathyroid Hormone; D044162:Parathyroid Hormone-Related Protein; D011506:Proteins