D-Penicillamine, previously suspected to have a beneficial effect on the
occurrence of severe retrolental fibroplasia among very low birth weight infants, was tested
to determine the extent to which this drug modifies acute radiosensitivity on 3- to 4-
day-old mice in comparison with adult animals. It was found that the radioprotective effect
of penicillamine, given in doses of 3,000 mg/kg i.p. 60 min before whole-body exposure to
6-10 Gy of 60Co gamma rays, was greater in 3- to 4-day-old mice than in adult animals.
These data seem to be compatible with the view that D-penicillamine, by virtue of its
antioxidant action, may reduce the toxic effects associated with exposure of the newborn
infant to hyperoxia, specifically retrolental fibroplasia and bronchopulmonary dysplasia.