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Hematologic effects of inactivating the Ras processing enzyme Rce1

Abigail L Aiyagari1, Brigit R Taylor, Vikas Aurora

  • 1Department of Pediatrics, Gladstone Institute of Cardiovascular Disease, University of California, San Francisco (UCSF), CA 94143, USA.

Blood
|November 16, 2002
PubMed

Insights

Pharmacologic inhibitors targeting Rce1, an enzyme crucial for Ras protein processing, show minimal impact on normal hematopoietic cells. Rce1 mutant cells effectively repopulated recipients, indicating Rce1 is not essential for hematopoiesis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Ras proteins require posttranslational processing for membrane targeting.
  • Rce1 is an endoprotease that cleaves the CAAX motif, releasing the C-terminal amino acids.
  • Rce1 plays a role in Ras protein prenylation and localization.

Purpose of the Study:

  • To investigate the role of Rce1 in hematopoiesis.
  • To assess the impact of Rce1 deficiency on hematopoietic stem and progenitor cells.
  • To evaluate the potential of Rce1 as a therapeutic target for anticancer drug discovery.

Main Methods:

  • Adoptive transfer of Rce1(-/-) fetal liver cells into lethally irradiated recipients.
  • Competitive repopulation assays to assess long-term repopulating potential.
  • Analysis of hematopoietic cell populations and extracellular signal-related kinase (ERK) activation.

Main Results:

  • Rce1(-/-) fetal liver cells rescued recipients and exhibited normal long-term repopulating capacity.
  • Recipients of Rce1(-/-) cells showed modest increases in mature myeloid cells without adverse effects.
  • Bone marrow cells from Rce1(-/-) transplants activated ERK normally in response to GM-CSF.

Conclusions:

  • Rce1 is not essential for normal hematopoietic stem cell function and long-term repopulation.
  • Pharmacologic inhibition of Rce1 is unlikely to significantly affect normal hematopoietic cells.
  • These findings suggest Rce1 inhibitors may have a favorable safety profile for anticancer therapy.

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