title: Improved resolution by mounting of tissue sections for laser microdissection.
abstract: BACKGROUND
  Laser microbeam microdissection has greatly facilitated the procurement of specific cell populations from tissue sections. However, the fact that a coverslip is not used means that the morphology of the tissue sections is often poor.
  
  
  OBJECTIVE
  To develop a mounting method that greatly improves the morphological quality of tissue sections for laser microbeam microdissection purposes so that the identification of target cells can be facilitated.
  
  
  METHODS
  Fresh frozen tissue and formalin fixed, paraffin wax embedded tissue specimens were used to test the morphological quality of mounted and unmounted tissue. The mounting solution consisted of an adhesive gum and blue ink diluted in water. Interference of the mounting solution with DNA quality was analysed by the polymerase chain reaction using 10-2000 cells isolated by microdissection from mounted and unmounted tissue.
  
  
  RESULTS
  The mounting solution greatly improved the morphology of tissue sections for laser microdissection purposes and had no detrimental effects on the isolation and efficiency of amplification of DNA. One disadvantage was that the mounting solution reduced the cutting efficiency of the ultraviolet laser. To minimise this effect, the mounting solution should be diluted as much as possible. Furthermore, the addition of blue ink to the mounting medium restores the cutting efficiency of the laser.
  
  
  CONCLUSIONS
  The mounting solution is easy to prepare and apply and can be combined with various staining methods without compromising the quality of the DNA extracted.
authors.affiliation: Department of Pathology, University Medical Centre Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands. m.vandijk@pathol.umcn.nl
authors.forename: M C R F
authors.initials: MC
authors.lastname: van Dijk
authors.forename: P D M
authors.initials: PD
authors.lastname: Rombout
authors.forename: H B P M
authors.initials: HB
authors.lastname: Dijkman
authors.forename: D J
authors.initials: DJ
authors.lastname: Ruiter
authors.forename: M R
authors.initials: MR
authors.lastname: Bernsen
mesh_terms: D004396:Coloring Agents; D004210:Dissection; D016591:Histocytological Preparation Techniques; D006801:Humans; D007834:Lasers; D016612:Paraffin Embedding
chemical_list: D004396:Coloring Agents