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Fiona E Hood1, Bertram Klinger2,3,4, Anna U Newlaczyl1

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Molecular Biology of the Cell
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Ras signaling is not redundant across its isoforms (HRAS, NRAS, KRAS). Oncogenic Ras mutants require growth factor signals for downstream effects, challenging prior assumptions about Ras pathway activation in cancer.

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Oncology

Background:

  • Ras isoforms (HRAS, NRAS, KRAS) are highly similar proteins activating common effectors.
  • Despite structural similarities, in vivo studies indicate Ras isoforms are not biologically redundant.
  • The isoform-specific mechanisms of Ras signaling remain poorly understood.

Purpose of the Study:

  • To characterize endogenous isoform-specific mutant Ras signaling.
  • To investigate the role of growth factor inputs in oncogenic Ras signaling.
  • To determine the context dependency of Ras isoform signaling.

Main Methods:

  • Utilized a novel panel of isogenic SW48 cell lines.
  • Endogenously expressed wild-type or G12V-mutated activated Ras isoforms.
  • Performed detailed characterization of endogenous isoform-specific mutant Ras signaling.

Main Results:

  • Oncogenic Ras mutants showed minimal downstream signaling without growth factor stimulation.
  • Lack of KRAS-induced effector activation in SW48 cells was observed in other colon cancer cell lines.
  • MAP kinase pathway activation in KRAS-mutant cells requires early growth factor stimulation of the Raf cycle.
  • Ras isoform-specific signaling is context-dependent, differing from ectopic expression studies.

Conclusions:

  • Ras isoform specificity is crucial and context-dependent.
  • Oncogenic Ras signaling requires coordinated growth factor input.
  • Findings challenge established models of Ras signaling derived from ectopic expression studies.