PARP1 accounts for 90% of the PARP family of enzymes. PARP-1 (poly(ADP-ribose)-polymerase 1), mainly known for its protective role in DNA repair, also regulates inflammatory processes.
The close connection between PARP1 and the tumor suppressor protein p53 is also of great interest to those who study the complex role of PARP1 in cancer promotion or suppression.
PARP1 inhibition, which blocks the JNK-PARP1-JNK loop and ERK-mediated anti-apoptotic protein expression, will result in cancer apoptosis.
PARP1 Overexpression:
In several cancer types—including breast, ovarian, prostate, and lung cancers—elevated PARP1 expression and/or activity has been reported.
High PARP1 expression in certain cancers has been associated with aggressive tumor behavior and resistance to therapies (especially those that induce DNA damage).
Increased PARP1 activity may correlate with poorer overall survival in tumors that rely on DNA repair for survival.
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