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Blood, 12 March 2009, Vol. 113, No. 11, pp. 2416-2425. Prepublished online as a Blood First Edition Paper on January 15, 2009; DOI 10.1182/blood-2008-03-144121.
Submitted March 7, 2008
Department of Microbiology & Immunology, Vanderbilt University, Nashville, TN, United States * Corresponding author; email: mark.boothby{at}vanderbilt.edu.
Poly(ADP-ribos)ylation is one of the longest-known but most enigmatic post-translational modifications transducing specific signals. The enzyme responsible for the majority of poly(ADP-ribose) polymerization in cells, PARP-1, promotes DNA repair but also mediates a caspase-independent form of apoptosis in response to stressors such as irradiation. However, the biological function of most other PARPs is not known. Macro-PARPs constitute one branch of the large family of PARP-like proteins also designated as B Aggressive Lymphoma proteins (BAL1, 2a/2b, 3, or PARP-9, -14, and -15). To elucidate biological role(s) of a BAL-family macro-PARP, we analyzed mice deficient in PARP-14, a binding partner of the IL-4-induced transcription factor Stat6. We show here that PARP-14 plays a fundamental role mediating protection against apoptosis in IL-4-treated B cells, including that following DNA damage, and mediates IL-4 effects on the levels of gene products that regulate cell survival, proliferation, and lymphomagenesis. Collectively, the results establish that PARP-14 mediates regulation of gene expression and lymphocyte physiology by IL-4 and has a function distinct from PARP-1. Furthermore, the findings suggest mechanisms by which BAL-family proteins might influence pathological processes involving B lymphocytes.
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