Linked Life Data

16288044

Source:http://linkedlifedata.com/resource/pubmed/id/16288044

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
22
pubmed:dateCreated
2005-11-18
pubmed:abstractText
Aberrant activation of tyrosine kinases is linked causally to human cancers. Activated Cdc42-associated kinase (Ack1), an intracellular tyrosine kinase, has primarily been studied for its signaling properties but has not been linked to specific pathologic conditions. Herein, we report that expression of activated Ack1 in LNCaP cells, while minimally increasing growth in culture, enhanced anchorage-independent growth in vitro and dramatically accelerated tumorigenesis in nude mice. Molecular chaperone heat shock protein 90beta (Hsp90beta)-bound Ack1 and treatment of cells with geldanamycin, a Hsp90 inhibitor, inhibited Ack1 kinase activity and suppressed tumorigenesis. Further, we identify the tumor suppressor WW domain containing oxidoreductase (Wwox) as an Ack1-interacting protein. Activated Ack1 tyrosine phosphorylated Wwox, leading to rapid dissociation of the Ack1-Wwox complex and concomitant Wwox polyubiquitination followed by degradation. Tyrosine phosphorylation of Wwox was critical for its degradation, as splice variant WwoxDelta5-8 that was not phosphorylated by Ack1 failed to undergo polyubiquitination and degradation. It has been reported that phosphorylation of Wwox at Tyr33 stimulated its proapoptotic activity. We observed that Y33F Wwox mutant was still tyrosine phosphorylated and polyubiquitinated by Ack1 action. Site-directed mutagenesis revealed that activated Ack1 primarily phosphorylated Wwox at Tyr287, suggesting that phosphorylation of distinct tyrosine residues activate or degrade Wwox. Primary androgen-independent prostate tumors but not benign prostate showed increased tyrosine-phosphorylated Ack1 and decreased Wwox. Taken together, these data indicate that Ack1 stimulated prostate tumorigenesis in part by negatively regulating the proapoptotic tumor suppressor, Wwox. Further, these findings suggest that Ack1 could be a novel therapeutic target for prostate cancer.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/HSP90 Heat-Shock Proteins, http://linkedlifedata.com/resource/pubmed/chemical/MERTK protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Oxidoreductases, http://linkedlifedata.com/resource/pubmed/chemical/Protein-Tyrosine Kinases, http://linkedlifedata.com/resource/pubmed/chemical/Proto-Oncogene Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Receptor Protein-Tyrosine Kinases, http://linkedlifedata.com/resource/pubmed/chemical/TNK2 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Tumor Suppressor Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Tyrosine, http://linkedlifedata.com/resource/pubmed/chemical/Ubiquitin, http://linkedlifedata.com/resource/pubmed/chemical/WWOX protein, human
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
65
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
10514-23
pubmed:dateRevised
2011-7-1
pubmed:meshHeading
pubmed-meshheading:16288044-Amino Acid Sequence, pubmed-meshheading:16288044-Animals, pubmed-meshheading:16288044-Cell Adhesion, pubmed-meshheading:16288044-Cell Growth Processes, pubmed-meshheading:16288044-Cell Line, Tumor, pubmed-meshheading:16288044-Cell Transformation, Neoplastic, pubmed-meshheading:16288044-Enzyme Activation, pubmed-meshheading:16288044-HSP90 Heat-Shock Proteins, pubmed-meshheading:16288044-Humans, pubmed-meshheading:16288044-Male, pubmed-meshheading:16288044-Mice, pubmed-meshheading:16288044-Mice, Nude, pubmed-meshheading:16288044-Molecular Sequence Data, pubmed-meshheading:16288044-Oxidoreductases, pubmed-meshheading:16288044-Phosphorylation, pubmed-meshheading:16288044-Prostatic Neoplasms, pubmed-meshheading:16288044-Protein-Tyrosine Kinases, pubmed-meshheading:16288044-Proto-Oncogene Proteins, pubmed-meshheading:16288044-Receptor Protein-Tyrosine Kinases, pubmed-meshheading:16288044-Tumor Suppressor Proteins, pubmed-meshheading:16288044-Tyrosine, pubmed-meshheading:16288044-Ubiquitin
pubmed:year
2005
pubmed:articleTitle
Activated tyrosine kinase Ack1 promotes prostate tumorigenesis: role of Ack1 in polyubiquitination of tumor suppressor Wwox.
pubmed:affiliation
Lineberger Comprehensive Cancer Center, Department of Medicine and Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7295, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural