Objectives. Some of the airway complications relate to the use of cyclosporine (CsA), a
potent agent widely used after organ transplantations. Several recent studies have
demonstrated CsA treatment to induce reactive oxygen species (ROS). The present study
was undertaken to investigate effects of CsA on production of ROS and antoxidant defense
of airway cells using the human bronchial epithelial cell line BEAS-2B.
Methods. We measured biological antioxidant potential (BAP), as well as ROS and
malondialdehyde levels in BEAS-2B cells after CsA treatment, using Free Radical
Analytical System 4 kits (Diacron, Grosseto, Italy). ROS production was expressed as Carr
Units as established by the manufacturer and BAP as mol/2 105
hyde, by the thiobarbituric acid assay.
Results. ROS production was increased in the BEAS-2B cells after CsA treatment: 73.5
at 0 (controls); 82.5 at 10; 84.0 at 30; 86.0 at 50; and 93.0 Carr Unit/2 105
cells at 100
g/mL of CsA. The levels of BAP were 1821 at 0 (controls), 1698 at 10; 1653 at 30; 1366
at 50 g/mL; and 1391 at 100 g/mL. The levels of malondialdehyde were increased: 3.8
at 0 (controls); 3.4 at 10; 4.4 at 30; 4.2 at 50: and 5.0 nmol/106
cells at 100 g/mL.
Conclusions. Increased production of ROS and decreased BAP by CsA in BEAS-2B
cells may increase malondialdehyde levels by radical-induced damage.