title: Immunosuppressive effect of bovine seminal ribonuclease on a model of corneal transplantation in rabbit.
abstract: BACKGROUND
  Bovine seminal ribonuclease (BS RNase) was determined to have a specific suppressive effect on the proliferation of T lymphocytes in vitro. Its immunosuppressive effect was proven in skin grafting in mice as well.
  
  
  METHODS
  The immunosuppressive effect of BS RNase was evaluated in tissue cultures and on a model of corneal transplantation in rabbits. The penetration of BS RNase into the anterior chamber was detected by immunoblotting of anterior chamber fluid obtained from animals treated either topically or subconjunctivally.
  
  
  RESULTS
  In vitro blastic transformation of mouse T lymphocytes was significantly inhibited by BS RNase (concentrations 15-250 micrograms/ml). No such effect was observed on B lymphocytes. In the rabbit model of corneal graft rejection, BS RNase injected subconjunctivally prolonged mean graft survival time significantly (33.4 days) compared with placebo (salt solution; MST 17.7 days). No BS RNase was detected by immunoblotting in anterior chamber fluid after either topical or subconjunctival application.
  
  
  CONCLUSIONS
  BS RNase showed significant immunosuppressive effect both in the blastic transformation test and in the rabbit high-risk model of corneal transplantation. Negative results of anterior chamber fluid immunoblotting indicate poor absorption of the drug.
authors.affiliation: Second Department of Ophthalmology, First Medical Faculty, Charles University, Prague, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Filipec
authors.forename: Z
authors.initials: Z
authors.lastname: Hasková
authors.forename: K
authors.initials: K
authors.lastname: Havrlíková
authors.forename: E
authors.initials: E
authors.lastname: Letko
authors.forename: V
authors.initials: V
authors.lastname: Holán
authors.forename: J
authors.initials: J
authors.lastname: Matousek
authors.forename: I
authors.initials: I
authors.lastname: Kalousek
mesh_terms: D000287:Administration, Topical; D000818:Animals; D000867:Anterior Chamber / Q000378:metabolism; D002417:Cattle; D002455:Cell Division; D002478:Cells, Cultured; D003228:Conjunctiva; D016039:Corneal Transplantation / Q000276:immunology / Q000473:pathology; D004722:Endoribonucleases / Q000493:pharmacokinetics / Q000494:pharmacology*; D006084:Graft Rejection / Q000276:immunology / Q000378:metabolism / Q000517:prevention & control*; D006085:Graft Survival / Q000187:drug effects; D015151:Immunoblotting; D007165:Immunosuppression Therapy / Q000379:methods*; D007267:Injections; D008213:Lymphocyte Activation / Q000187:drug effects; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011817:Rabbits; D013601:T-Lymphocytes / Q000187:drug effects* / Q000276:immunology
chemical_list: D004722:Endoribonucleases; C032523:ribonuclease SPL