Antioxidant enzymes of the nuclear shield.

Activities of GST, CAT and GPX were measured as reported in Materials and Methods. Values
reported are the means of 5 independent tissue preparations. The
standard deviation of the five different replicas are reported for
each measurement. The units of the cytosolic GSTs (first column) are
the sum of the activity contributions of all enzyme isoforms.
*“Defense potentiality” is defined as the amount of
enzyme unit normalized per membrane area.
**Units of cytosolic Alpha class GST were calculated from
previous studies (see Materials and
Methods).
†GST units in the shield of various tissues were tentatively ascribed
to Alpha class GST as occurs for the liver [15].