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Related Experiment Video

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Real-time Imaging of Myeloid Cells Dynamics in ApcMin/+ Intestinal Tumors by Spinning Disk Confocal Microscopy
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PAK1 promotes intestinal tumor initiation.

Kyle Dammann1, Vineeta Khare1, Felix Harpain1

  • 1Department of Internal Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria.

Cancer Prevention Research (Philadelphia, Pa.)
|August 26, 2015
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Summary
This summary is machine-generated.

p21-activated kinase 1 (PAK1) deletion impedes intestinal tumor initiation and growth. PAK1 inhibition by 5-ASA also reduced tumor multiplicity, indicating PAK1

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • p21-activated kinase 1 (PAK1) is overexpressed in colorectal cancer.
  • Mesalamine (5-aminosalicylic acid, 5-ASA) targets PAK1 and has chemopreventive potential.
  • PAK1's role in intestinal tumorigenesis requires further investigation.

Purpose of the Study:

  • To investigate the role of PAK1 in intestinal cancer initiation and progression.
  • To determine if PAK1 deletion impedes tumor development in mouse models.
  • To evaluate the combined effects of PAK1 deletion and 5-ASA treatment on intestinal tumorigenesis.

Main Methods:

  • Utilized APC(min) and azoxymethane/dextran sodium sulfate (AOM/DSS) mouse models of intestinal cancer.
  • Assessed tumor number, size, and incidence via colonoscopy and pathology.
  • Evaluated molecular targets including p-AKT, β-catenin, and c-Myc using immunohistochemistry (IHC).

Main Results:

  • PAK1 deletion reduced tumor multiplicity and burden in APC(min) mice, with decreased p-AKT, β-catenin, and c-Myc.
  • PAK1 deletion decreased tumor multiplicity in AOM/DSS-treated mice.
  • Combined 5-ASA treatment and PAK1 deletion impeded tumor multiplicity and dysplastic lesions, with 5-ASA inhibiting β-catenin signaling via PAK1/p-AKT.

Conclusions:

  • PAK1 deletion impedes intestinal tumorigenesis by reducing tumor initiation and progression.
  • PAK1 is a key mediator in intestinal carcinogenesis.
  • Targeting PAK1, potentially through 5-ASA, offers a therapeutic strategy for colorectal cancer prevention.