Related Experiment Video

Updated: Jun 12, 2025

Mimicking and Manipulating Pancreatic Acinar-to-Ductal Metaplasia in 3-dimensional Cell Culture
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Mimicking and Manipulating Pancreatic Acinar-to-Ductal Metaplasia in 3-dimensional Cell Culture

Published on: February 11, 2019

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Emerin is an effector of oncogenic KRAS-driven nuclear dynamics in pancreatic cancer

Luis F Flores1, David L Marks1, Renzo E Vera1

  • 1Division of Oncology Research.

JCI Insight
|June 10, 2025
PubMed

Insights

Oncogenic mutant KRAS shrinks cancer cell nuclei by regulating Emerin (EMD). Depleting EMD increases nuclear size and reduces poorly differentiated pancreatic cancer, revealing a novel mechanism in PDAC carcinogenesis.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Nuclear shape and size alterations are hallmarks of cancer, historically used for diagnosis and staging.
  • The underlying mechanisms and biological significance of aberrant nuclear phenotypes in cancer remain largely unknown.

Purpose of the Study:

  • To investigate the mechanisms and biological significance of nuclear size changes in pancreatic ductal adenocarcinoma (PDAC).
  • To identify key molecular players regulating nuclear size in PDAC driven by oncogenic KRAS mutations.

Main Methods:

  • Utilized a PDAC model to study the effects of mutant KRAS on nuclear size.
  • Performed transcriptomic and protein expression analysis to identify differentially expressed genes.
  • Investigated the role of nuclear lamina protein Emerin (EMD) downstream of KRAS.
  • Analyzed human PDAC samples for EMD expression and nuclear size correlation.
  • Conducted in vivo genetic depletion of EMD in a PDAC model.

Main Results:

  • Oncogenic mutant KRAS was found to reduce nuclear size in PDAC cells.
  • Mutant KRAS expression altered the levels of nuclear envelope-associated genes, with Emerin (EMD) identified as a key mediator of nuclear size reduction.
  • Increased EMD expression in human PDAC samples correlated with reduced nuclear size.
  • In vivo EMD depletion in a KRAS-driven PDAC model led to increased nuclear size and a decreased incidence of poorly differentiated tumors.

Conclusions:

  • Identified a novel mechanism where mutant KRAS-driven Emerin (EMD) expression reduces nuclear size in pancreatic cancer.
  • Demonstrated that EMD plays a significant role in regulating nuclear size and differentiation status in PDAC.
  • These findings provide new insights into the molecular basis of nuclear morphology changes and their impact on PDAC carcinogenesis.
Keywords:
CancerCell biologyOncology

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