system
Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: BACKGROUND, OBJECTIVE, METHODS, RESULTS. Meshes: Animals, Apoptosis, Cell Line, Tumor, Cell Survival, Drug Resistance, Neoplasm, Female, Humans, Mice, Mice, Nude, NFATC Transcription Factors, Pancreatic Neoplasms, Proto-Oncogene Proteins, RNA, Messenger, Random Allocation, Signal Transduction, TNF-Related Apoptosis-Inducing Ligand, Transcription, Genetic, Up-Regulation, Wnt Proteins, Wnt-5a Protein, beta Catenin.
user
Does wNT5A-NFAT signaling mediate resistance to apoptosis in pancreatic cancer? Context: WNT5A belongs to the Wnt family of secreted signaling molecules. Using transcriptional profiling, we previously identified WNT5A as target of the antiapoptotic transcription factor CUX1 and demonstrated high expression levels in pancreatic cancer. However, the impact of WNT5A on drug resistance and the signaling pathways employed by WNT5A remain to be elucidated. This project aims to decipher the impact of WNT5A on resistance to apoptosis and the signaling pathways employed by WNT5A in pancreatic cancer. The impact of WNT5A and its downstream effectors on tumor growth and drug resistance was studied in vitro and in xenograft models in vivo. Tissue microarrays of pancreatic cancer specimens were employed for immunohistochemical studies. Knockdown of WNT5A results in a significant increase in drug-induced apoptosis. In contrast, overexpression of WNT5A or addition of recombinant WNT5A mediates resistance to apoptosis in vitro. In our attempt to identify downstream effectors of WNT5A, we identified the transcription factor nuclear factor of activated T cells c2 (NFATc2) as transcriptional target of WNT5A signaling. NFATc2 confers a strong antiapoptotic phenotype mediating at least in part the effects of WNT5A on drug resistance and tumor cell survival. In vivo, WNT5A expression leads to resistance to gemcitabine-induced apoptosis in a xenograft model, which is paralleled by up-regulation of NFATc2. Both WNT5A and NFATc2 proteins are highly expressed in human pancreatic cancer tissues and their expression levels correlated significantly.
assistant
We identified the WNT5A-NFATc2 axis as important mediator of drug resistance in pancreatic cancer. Final Decision: yes