title: [MMP-26 mRNA and estrogen receptor alpha co-expression in normal and pathological endometrium].
abstract: OBJECTIVE
  To examine the expression pattern of matrix metalloproteinase-26 (MMP-26) mRNA and estrogen receptor-alpha (ER alpha) in normal, hyperplastic, premalignant and malignant endometrial tissue.
  
  
  METHODS
  Experimental study.
  
  
  METHODS
  Department of Obstetrics and Gynecology of the Palacky University Medical School and University Hospital, Olomouc, Czech Republic, Department of Obstetrics and Gynecology, University Hospital, Lund, Sweden, Atherosclerosis Research Unit, King Gustav V Research Institute, Karolinska Hospital, Stockholm, Sweden.
  
  
  METHODS
  We studied MMP-26 mRNA and ER alpha in 36 normal, 7 hyperplastic, 6 premalignant and 19 malignant endometrial samples. Based on histological examination, all normal specimens were classified according to an ideal 28 day menstrual cycle as early, mid, and late proliferative phase, early, mid and late secretory phase and menstrual phase. Samples with hyperplasia were classified as simple or complex. Premalignant samples were represented by complex hyperplasia with atypia. Malignant samples were histologically classified as well, intermediately and poorly differentiated, respectively. Specimens were analyzed using in situ hybridization and real time PCR. ER alpha was localized by immunohistochemistry.
  
  
  RESULTS
  Epithelial MMP-26 mRNA expression was highest in the early secretory phase and in endometrial hyperplasia. Expression levels were low in the late secretory and menstrual phase and in malignant samples decreased gradually with dedifferentiation. Expression pattern of MMP-26 mRNA in normal, hyperplastic, premalignant and malignant endometrial tissue strongly co-variated with that of ER alpha.
  
  
  CONCLUSIONS
  Co-expression of MMP-26 and ER alpha in normal and pathological endometrial tissue suggests possible regulation of MMP-26 gene by estrogen.
authors.affiliation: Gynekologicko porodnická klinika, FN a LF UP, Olomouc.
authors.forename: R
authors.initials: R
authors.lastname: Pilka
authors.forename: M
authors.initials: M
authors.lastname: Kudela
authors.forename: P
authors.initials: P
authors.lastname: Eriksson
authors.forename: B
authors.initials: B
authors.lastname: Casslén
mesh_terms: D000328:Adult; D004714:Endometrial Hyperplasia / Q000378:metabolism; D016889:Endometrial Neoplasms / Q000378:metabolism*; D004717:Endometrium / Q000737:chemistry*; D047628:Estrogen Receptor alpha / Q000032:analysis*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D020782:Matrix Metalloproteinases / Q000032:analysis* / Q000235:genetics; D053505:Matrix Metalloproteinases, Secreted; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis*
chemical_list: D047628:Estrogen Receptor alpha; D012333:RNA, Messenger; C410599:MMP26 protein, human; D020782:Matrix Metalloproteinases; D053505:Matrix Metalloproteinases, Secreted