title: Enforced expression of PPP1R13L increases tumorigenesis and invasion through p53-dependent and p53-independent mechanisms.
abstract: PPP1R13L was initially identified as a protein that binds to the NF-kappaB subunit p65/RelA and inhibits its transcriptional activity. It also binds p53 and inhibits its action. One set of experimental findings based on overexpression of PPP1R13L indicates that PPP1R13L blocks apoptosis. Another set of experiments, based on endogenous production of PPP1R13L, suggests that the protein may sometimes be pro-apoptotic. We have used primary mouse embryonic fibroblasts (MEFs), dually transformed by HRAS and adenovirus E1A and differing in their p53 status, to explore the effects of PPP1R13L overexpression, thus examining the ability of PPP1R13L to act as an oncoprotein. We found that overexpression of PPP1R13L strongly accelerated tumor formation by RAS/E1A. PPP1R13L overexpressing cells were depleted for both p53 and active p65/RelA and we found that both p53-dependent and -independent apoptosis pathways were modulated by PPP1R13L. Finally, studies with the proteasome inhibitor MG132 revealed that overexpression of PPP1R13L causes faster p53 degradation, a likely explanation for the depletion of p53. Taken together, our results show that increased levels of PPP1R13L can increase tumorigenesis and furthermore suggest that PPP1R13L can influence metastasis.
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, USA.
authors.forename: Magdalena J
authors.initials: MJ
authors.lastname: Laska
authors.forename: Scott W
authors.initials: SW
authors.lastname: Lowe
authors.forename: Lars
authors.initials: L
authors.lastname: Zender
authors.forename: Stephen
authors.initials: S
authors.lastname: Hearn
authors.forename: Ulla
authors.initials: U
authors.lastname: Vogel
authors.forename: Uffe B
authors.initials: UB
authors.lastname: Jensen
authors.forename: Anka
authors.initials: A
authors.lastname: Bric
authors.forename: Bjørn A
authors.initials: BA
authors.lastname: Nexø
mesh_terms: D017500:Adenovirus E1A Proteins / Q000235:genetics / Q000378:metabolism; D000818:Animals; D017209:Apoptosis; D002453:Cell Cycle / Q000235:genetics / Q000502:physiology; D002465:Cell Movement / Q000235:genetics / Q000502:physiology; D049109:Cell Proliferation; D002471:Cell Transformation, Neoplastic / Q000235:genetics; D004622:Embryo, Mammalian / Q000166:cytology; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism*; D007976:Leupeptins / Q000494:pharmacology; D051379:Mice; D018345:Mice, Knockout; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D009374:Neoplasms, Experimental / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology; D051996:Transcription Factor RelA / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*; D018631:ras Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D017500:Adenovirus E1A Proteins; D047908:Intracellular Signaling Peptides and Proteins; D007976:Leupeptins; C501916:Ppp1r13l protein, mouse; C498144:Rela protein, mouse; D012097:Repressor Proteins; D051996:Transcription Factor RelA; D016159:Tumor Suppressor Protein p53; D018631:ras Proteins; C072553:benzyloxycarbonylleucyl-leucyl-leucine aldehyde