PARP activity was assayed using the Trevigen Universal chemiluminescent PARP assay kit (Trevigen, Gaithersburg, MD, USA) following the manufacturer's instructions.
Inhibition of PARP activity by >50% was the target PARP-inhibitory dose (PID) in this study (Plummer et al, 2008).
PARP activity was quantified by summing the numbers of cells positive for PARP activity in five HPFs.
In activated T lymphocytes, a marked increase in PARP activity occurs to ensure efficient DNA repair and possibly to implement signal transduction [10], [15], [16].
Thus PARP activity has an additional role in both the activation and shutdown of promoter activity.
PARP-1 is the predominant PARP isoform in most tissues and accounts for about 90% of total cellular PARP activity [ 43].
PARP activity in lung tissues was measured by using an immunohistochemical method of PARP activity using biotinylated NAD+, the substrate of the PARP [ 12, 19].
The increased apoptosis, as measured by cleaved PARP activity, was reduced in JNK1 knockout mice and ERK1/2 activation with ERK1/2 inhibitor (PD98059).
The PARP activity in rd1 photoreceptors might have a bearing on calpain activation [15] and could itself be governed by the activity of HDACs, since HDAC inhibition in rd1 retina also abolished PARP activity [38].
