Perivascular remodeling to enhance drug delivery in Pancreatic Cancer

Information

  • Research Project
  • 10118368
  • ApplicationId
    10118368
  • Core Project Number
    P20GM109024
  • Full Project Number
    5P20GM109024-05
  • Serial Number
    109024
  • FOA Number
    PAR-14-035
  • Sub Project Id
    8123
  • Project Start Date
    -
  • Project End Date
    -
  • Program Officer Name
    DAVANI, BEHROUS
  • Budget Start Date
    3/1/2020 - 4 years ago
  • Budget End Date
    2/28/2021 - 3 years ago
  • Fiscal Year
    2020
  • Support Year
    05
  • Suffix
  • Award Notice Date
    3/16/2020 - 4 years ago

Perivascular remodeling to enhance drug delivery in Pancreatic Cancer

Abstract: Pancreatic ductal adenocarcinoma (PDAC) presents a hostile tumor microenvironment (TME) that is stroma-rich, hypoxic, hypovascular, and with poor perfusion efficiency which can largely contribute to tumor progression/metastasis and the limited delivery efficacy of treatment drugs. Our research is focused on investigating the perivascular heterogeneity in PDAC TME and identify novel mechanisms to reprogram the perivascular signature that will promote vascular functionality. Previously we have shown that perivascular landscape can be modified upon changes of TME and have a profound effect on vascular function. In this grant application, we will investigate dynamic pericyte phenotype in response to the changes of TME. We will utilize both orthotopic and spontaneous mouse models of pancreatic cancer and perform comprehensive pericyte phenotyping at different stages of angiogenic remodeling by employing multispectral imaging of immunolabeled tumors. Previously, Ang2-Tie2 signaling has been implicated in pericyte phenotype; therefore, we will perform genetic ablation of PDGFRb+ pericytes using viral thymidine kinase system (PDGFRb-vTK) which will induce hypoxia and high Ang2 expression. Tumor vasculature will be analyzed to identify the changes. To determine molecular conversion mechanism that is involved in pericyte phenotype, we will utilize mesenchymal stem cells (MSCs), endothelial cells, and pancreatic cancer cells co-culture system. MSCs driven pericytes cultured in a variable environment will be subjected to the molecular profiling. Finally, to evaluate the therapeutic efficacy of pericytes re-investment in combination with chemotherapeutic agents such as gemcitabine (GEM), we will evaluate tumor progression and metastasis on GEMMs of PDAC upon treatment. PDGFRb-vTK-KPC mice will be utilized to deplete immature active PDGFRb+ pericytes then treated with neutralizing anti-Ang2 antibody which will re-invest tumor vasculature with desmin+ mature pericytes in combination with GEM. Tumor progression and metastasis will be monitored to evaluate the efficacy of combinatorial treatment, and changes in perivascular phenotype will be examined by multispectral imaging of immunolabeled tumors. This study will provide insight into pericyte biology regarding the molecular mechanism that governs differential pericyte phenotype as well as innovative approaches to re-purpose chemotherapeutic agents that were previously failed to yield substantial response in patients with PDAC.

IC Name
NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES
  • Activity
    P20
  • Administering IC
    GM
  • Application Type
    5
  • Direct Cost Amount
    155486
  • Indirect Cost Amount
    69969
  • Total Cost
  • Sub Project Total Cost
    225455
  • ARRA Funded
    False
  • CFDA Code
  • Ed Inst. Type
  • Funding ICs
    NIGMS:225455\
  • Funding Mechanism
    RESEARCH CENTERS
  • Study Section
    ZGM1
  • Study Section Name
    Special Emphasis Panel
  • Organization Name
    NORTH DAKOTA STATE UNIVERSITY
  • Organization Department
  • Organization DUNS
    803882299
  • Organization City
    FARGO
  • Organization State
    ND
  • Organization Country
    UNITED STATES
  • Organization Zip Code
    581086050
  • Organization District
    UNITED STATES