title: RCAS1 decidual immunoreactivity during cesarean section in scar deciduosis: immune cell presence and activity.
abstract: BACKGROUND
  Scar deciduosis provides a research model that enables us to assess the impact of decidua on the activity and quality of the immune cells infiltrating this scar tissue. This unique model allows us to examine these processes under conditions excluding the impact of placental cells which, along with decidual cells, control the activity of immune cells under physiological conditions. RCAS1 is a protein responsible for the suppression of the cytotoxic immune response during gestation. The present study evaluates the immunoreactivity level of RCAS1 with respect to immune cell status in the decidua and scar deciduosis.
  
  
  METHODS
  Immunohistochemical analysis of RCAS1, CD3, CD56, CD25, and CD69 antigen immunoreactivity levels was performed in tissue samples derived from scar deciduosis that developed after a previous cesarean section and were excised during a subsequent cesarean section. The control group consisted of decidua samples derived from cesarean section at term.
  
  
  RESULTS
  A statistically significantly higher RCAS1 immunoreactivity level was identified in scar deciduosis tissue samples than in decidua derived from a cesarean section at term. The number of CD56+ cells and immunoreactivity of the CD25 antigen level were observed to be statistically significantly higher in scar deciduosis than in the control group.
  
  
  CONCLUSIONS
  The presence of an enhanced number of immune cells of higher activity in ectopic decidua during the final step of decidualization seems to be associated with an increase in the immunoreactivity level of RCAS1.
authors.affiliation: Clinical Department of Obstetrics and Gynecology, State Hospital, Rzeszów, Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Skret-Magierlo
authors.forename: Lukasz
authors.initials: L
authors.lastname: Wicherek
authors.forename: Pawel
authors.initials: P
authors.lastname: Basta
authors.forename: Krystyna
authors.initials: K
authors.lastname: Galazka
authors.forename: Jerzy
authors.initials: J
authors.lastname: Sikora
authors.forename: Mariusz
authors.initials: M
authors.lastname: Wilk
authors.forename: Ludmiła
authors.initials: L
authors.lastname: Fudali
authors.forename: Andrzej
authors.initials: A
authors.lastname: Skret
mesh_terms: D000328:Adult; D000951:Antigens, Neoplasm / Q000276:immunology*; D017252:CD3 Complex / Q000276:immunology; D019002:CD56 Antigen / Q000276:immunology; D002585:Cesarean Section; D002921:Cicatrix / Q000276:immunology*; D003656:Decidua / Q000276:immunology*; D005260:Female; D006801:Humans; D008214:Lymphocytes / Q000276:immunology*; D011247:Pregnancy
chemical_list: D000951:Antigens, Neoplasm; D017252:CD3 Complex; D019002:CD56 Antigen; C120762:EBAG9 protein, human