Pancreatic cancer (PC) is the fourth leading cause of cancer-related deaths in the U.S. Only a subset of patients initially responds to the current chemotherapeutic agent gemcitabine. Traditional cytotoxic agents are ineffective at controlling the signaling pathways that ultimately drive the disease progression. Hence, there is an urgent need to target signaling pathways specifically amplified during disease progression. An important theme that has emerged from our preliminary studies is that afatinib, an irreversible inhibitor of all ErbB family members, would be an alternative strategy for the combined approach of targeting all EGFR family members. Through this proposal we seek to develop an effective therapy for PC by combining the afatinib and the cytotoxic agent gemcitabine to provide broad spectrum molecular (EGFR family proteins and also mucins) targeted therapeutic protocol with enhanced antitumor efficacy and control of chemoresistance. Based on previous studies and our preliminary observations we hypothesize that """"""""afatinib, a pan-EGFR family inhibitor will enhance the efficacy of gemcitabine by modulating/downregulation EGFR family proteins along with mucins, augmenting tumor microenvironment and targeting cancer stem cells"""""""". We have proposed three specific aims to test this hypothesis.
The first aim i s to evaluate the functional effect of afatinib, alone and in combination with gemcitabine in PC cells, functiona significance and intrinsic resistance by using the combinational approach in PC cells. In this aim we will explore the mechanism of action of afatinib in augmenting mucin-mediated therapeutic resistance in PC cells. We will also predict the sensitivity of the combination of gemcitabine with afatinib in overcoming intrinsic resistance in vitro in PC cells.
The second aim i s focused at exploring the efficacy of the combination of gemcitabine with afatinib in genetically engineered mouse model of PC.
The third aim i s to investigate the potential impact of pan-EGFR Inhibitor in overcoming intrinsic resistance imposed by pancreatic cancer stem cells (PCSC) and tumor microenvironment. In this aim, we will analyze the effect of combination therapy on pancreatic cancer stem cells and tumor microenvironment to overcome the chemotherapeutic resistance. The significance of the present proposal is to understand the central mechanism(s) of the afatinib-induced enhanced chemotherapeutic efficacy of gemcitabine in lethal PC. Altogether, the overall results of this proposal would be enormously promising for initiating clinical trials consisting of a combination of EGFR family member specific inhibitor afatinib with gemcitabine as a therapeutic tool in PC patients. The outcome of the proposed studies will have high impact on thousands of pancreatic cancer patients currently receiving gemcitabine as a first line chemotherapy.
Our overall goal is to develop an effective therapy for pancreatic cancer by combining the afatinib and the cytotoxic agent gemcitabine to provide a broad spectrum molecular (EGFR family proteins and also mucins) targeted therapeutic protocol with enhanced anti-tumor efficacy and control of chemo resistance. Based on previous studies and our preliminary observations we hypothesize that afatinib, a pan-EGFR family inhibitor will enhance the efficacy of GEM by modulating/downregulation EGFR family proteins along with mucins, augmenting tumor microenvironment and targeting cancer stem cells. The outcome of the proposed studies will have an immediate impact on thousands of cancer patients currently receiving gemcitabine as a first line chemotherapy.
|Pai, Priya; Rachagani, Satyanarayana; Dhawan, Punita et al. (2016) MUC4 is negatively regulated through the Wnt/Î²-catenin pathway via the Notch effector Hath1 in colorectal cancer. Genes Cancer 7:154-68|
|Muniyan, Sakthivel; Haridas, Dhanya; Chugh, Seema et al. (2016) MUC16 contributes to the metastasis of pancreatic ductal adenocarcinoma through focal adhesion mediated signaling mechanism. Genes Cancer 7:110-24|
|Joshi, Suhasini; Cruz, Eric; Rachagani, Satyanarayana et al. (2016) Bile acids-mediated overexpression of MUC4 via FAK-dependent c-Jun activation in pancreatic cancer. Mol Oncol 10:1063-77|
|Pai, Priya; Rachagani, Satyanarayana; Dhawan, Punita et al. (2016) Mucins and Wnt/Î²-catenin signaling in gastrointestinal cancers: an unholy nexus. Carcinogenesis 37:223-32|
|Vaz, Arokia Priyanka; Deb, Shonali; Rachagani, Satyanarayana et al. (2016) Overexpression of PD2 leads to increased tumorigenicity and metastasis in pancreatic ductal adenocarcinoma. Oncotarget 7:3317-31|
|Wang, Yan; Kumar, Sushil; Rachagani, Satyanarayana et al. (2016) Polyplex-mediated inhibition of chemokine receptor CXCR4 and chromatin-remodeling enzyme NCOA3 impedes pancreatic cancer progression and metastasis. Biomaterials 101:108-20|
|Pai, Priya; Rachagani, Satyanarayana; Lakshmanan, Imayavaramban et al. (2016) The canonical Wnt pathway regulates the metastasis-promoting mucin MUC4 in pancreatic ductal adenocarcinoma. Mol Oncol 10:224-39|
|Chugh, Seema; Meza, Jane; Sheinin, Yuri M et al. (2016) Loss of N-acetylgalactosaminyltransferase 3 in poorly differentiated pancreatic cancer: augmented aggressiveness and aberrant ErbB family glycosylation. Br J Cancer 114:1376-86|
|Joshi, S; Kumar, S; Ponnusamy, M P et al. (2016) Hypoxia-induced oxidative stress promotes MUC4 degradation via autophagy to enhance pancreatic cancer cells survival. Oncogene 35:5882-5892|
|Kumar, S; Das, S; Rachagani, S et al. (2015) NCOA3-mediated upregulation of mucin expression via transcriptional and post-translational changes during the development of pancreatic cancer. Oncogene 34:4879-89|
Showing the most recent 10 out of 19 publications