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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.


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Submitted March 7, 2008
Accepted January 1, 2009

PARP-14, a member of the B aggressive lymphoma (BAL) family, transduces survival signals in primary B cells

Sung Hoon Cho, Shreevrat Goenka, Tiina Henttinen, Prathyusha Gudapati, Arja Reinikainen, Christine M. Eischen, Riitta Lahesmaa, and Mark Boothby*

Department of Microbiology & Immunology, Vanderbilt University, Nashville, TN, United States
Centre for Biotechnology, University of Turku, Turku, Finland
Department of Pathology, Vanderbilt Univeristy, Nashville, TN, United States
Department of Medicine, 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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