title: The effects of estradiol and progesterone on the synthesis of collagen in tracheal surgery.
abstract: OBJECTIVE
  Estrogen and progesterone have the decreasing effect on massive collagen synthesis in wound healing. Here, it is aimed to determine their decreasing effect on collagen accumulation and fibroblast proliferation in trachea histologically and to understand if they would be protective for tracheal stenosis.
  
  
  METHODS
  Thirteen male Winstar rats were divided randomly into two groups: estrogen-progesterone group (group 1, eight rats) and control group (group 2, five rats). Under general anesthesia, tracheas were incised vertically extending from second to fifth tracheal ring. Incision was closed with absorbable sutures. Estrodiol benzoat and progesterone was given intramuscularly to estrogen progesterone group, saline solution to control group. After 4 weeks they were sacrificed and tracheas were excised. Horizontal cross section of the narrowest part of the incised trachea was examined histologically. Epithelial regeneration, inflammatory cell infiltration, angiogenesis, fibroblast proliferation and collagen deposition were evaluated by histological grading.
  
  
  RESULTS
  Statistically significant difference was found between the groups in collagen deposition and fibroblast proliferation (p=0.011, <0.05). For epithelial regeneration, inflammatory cell infiltration, and angiogenesis there was no difference.
  
  
  CONCLUSIONS
  As a result, it was proved that sex hormones inhibit massive collagen deposition and fibroblast proliferation in wound healing of tracheal surgery. Hence, they may prevent tracheal stenosis.
authors.affiliation: Thoracic Surgery Department, Kocaeli University, The Faculty of Medicine, Kocaeli, Turkey. tuba.liman@superonline.com
authors.forename: Serife Tuba
authors.initials: ST
authors.lastname: Liman
authors.forename: Cuneyt Orhan
authors.initials: CO
authors.lastname: Kara
authors.forename: Ferda
authors.initials: F
authors.lastname: Bir
authors.forename: Basak
authors.initials: B
authors.lastname: Yildirim
authors.forename: Salih
authors.initials: S
authors.lastname: Topcu
authors.forename: Barbaros
authors.initials: B
authors.lastname: Sahin
mesh_terms: D000818:Animals; D049109:Cell Proliferation / Q000187:drug effects; D003094:Collagen / Q000096:biosynthesis*; D003251:Constriction, Pathologic; D004958:Estradiol / Q000494:pharmacology*; D005347:Fibroblasts / Q000187:drug effects; D012739:Gonadal Steroid Hormones / Q000494:pharmacology*; D008297:Male; D023421:Models, Animal; D011374:Progesterone / Q000494:pharmacology*; D051381:Rats; D014132:Trachea / Q000293:injuries* / Q000601:surgery; D014945:Wound Healing / Q000187:drug effects*
chemical_list: D012739:Gonadal Steroid Hormones; D011374:Progesterone; D004958:Estradiol; D003094:Collagen