title: Giant cell formation in cells exposed to 740 nm and 760 nm optical traps.
abstract: OBJECTIVE
  Optical trapping is becoming a useful and widespread technique for the micromanipulation of cells and organelles. Giant cell formation following optical trapping was studied to detect the potential adverse effects.
  
  
  METHODS
  The nuclei of preselected single CHO cells were exposed to 740 nm and 760 nm laser microbeam generated by a titanium-sapphire tunable laser at 88 and 176 mW and different time exposures. The irradiated single cells were recorded and observed morphologically following exposure. Giant cells were tabulated and photographed.
  
  
  RESULTS
  The irradiated cells either failed to divide, or they underwent nuclear proliferation to form giant cells through endoreduplication.
  
  
  CONCLUSIONS
  Giant cells were induced by both 740 nm and 760 nm. The frequency of giant cell formation was higher for the longer time exposures and at the higher power densities. The use of an optical etalon to remove intracavity mode beating and high peak powers of the titanium-sapphire laser caused a significant reduction in the formation of giant cells.
authors.affiliation: Beckman Laser Institute and Medical Clinic, University of California, Irvine 92715, USA.
authors.forename: H
authors.initials: H
authors.lastname: Liang
authors.forename: K T
authors.initials: KT
authors.lastname: Vu
authors.forename: T C
authors.initials: TC
authors.lastname: Trang
authors.forename: D
authors.initials: D
authors.lastname: Shin
authors.forename: Y E
authors.initials: YE
authors.lastname: Lee
authors.forename: D C
authors.initials: DC
authors.lastname: Nguyen
authors.forename: B
authors.initials: B
authors.lastname: Tromberg
authors.forename: M W
authors.initials: MW
authors.lastname: Berns
mesh_terms: D000818:Animals; D016466:CHO Cells; D002455:Cell Division / Q000528:radiation effects; D002467:Cell Nucleus / Q000528:radiation effects; D002478:Cells, Cultured; D006224:Cricetinae; D015726:Giant Cells / Q000502:physiology* / Q000528:radiation effects*; D007834:Lasers; D008846:Micromanipulation; D011829:Radiation Dosage