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In vitro Cell Migration and Invasion Assays
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AIM1 is an actin-binding protein that suppresses cell migration and micrometastatic dissemination

Michael C Haffner1,2, David M Esopi1, Alcides Chaux2,3

  • 1Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.

Nature Communications
|July 28, 2017
PubMed

Insights

Absent in melanoma 1 (AIM1) suppresses cancer cell invasion by regulating the actin cytoskeleton. Loss of AIM1 promotes prostate cancer cell migration, invasion, and metastasis, indicating its role as a tumor suppressor.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Cancer cell migration and invasion are hallmarks of primary and metastatic cancers.
  • Altered cytoskeletal dynamics, particularly involving β-actin, are crucial for these invasive properties.

Purpose of the Study:

  • To identify novel actin-binding proteins that regulate cancer cell invasion.
  • To investigate the role of Absent in melanoma 1 (AIM1) in prostate cancer progression.

Main Methods:

  • Depletion of AIM1 in prostate epithelial cells.
  • Assessment of cytoskeletal remodeling, cell migration, invasion, and anchorage-independent growth.
  • In vivo studies to evaluate metastatic dissemination.
  • Analysis of AIM1 expression and localization in normal and cancerous prostate tissues.

Main Results:

  • AIM1 depletion increased cytoskeletal remodeling, intracellular traction forces, cell migration, invasion, and anchorage-independent growth.
  • Reduced AIM1 expression led to increased metastatic dissemination in vivo.
  • AIM1 associated with the actin cytoskeleton in normal prostate cells but was mislocalized in prostate cancers.
  • Advanced prostate cancers showed AIM1 deletion and reduced expression.

Conclusions:

  • AIM1 acts as a suppressor of pro-invasive phenotypes in prostate epithelial cells.
  • Dysregulation of AIM1, including mislocalization and reduced expression, is implicated in primary and metastatic prostate cancer.
  • AIM1 is a potential therapeutic target for suppressing prostate cancer invasion and metastasis.

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