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Inactivating mutations block the tumor necrosis factor-alpha-converting enzyme in the early secretory pathway

Teresa Villanueva de la Torre1, Joan J Bech-Serra, Soraya Ruiz-Paz

  • 1Laboratori de Recerca Oncològica, Servei d'Oncologia Mèdica, Hospital Universitari Vall d'Hebron, Psg. Vall d'Hebron 119-129, 08035, Barcelona, Spain.

Biochemical and Biophysical Research Communications
|January 31, 2004
PubMed

Insights

Mutations in proTNF-alpha converting enzyme (TACE) prevent its proper processing and cell surface transport. Introducing wild-type TACE rescues the shedding defect in mutant cells, highlighting TACE biosynthesis importance.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • The shedding of transmembrane protein ectodomains is a critical biological process.
  • Pro-transforming growth factor-alpha (proTGF-alpha) and amyloid-beta precursor protein (APP) shedding are mediated by proTNF-alpha converting enzyme (TACE).
  • Mutant cell lines M1 and M2 exhibit defects in proTGF-alpha and APP shedding due to inactive TACE accumulation in the early secretory pathway.

Purpose of the Study:

  • To investigate the role of TACE mutations in the observed shedding defects in M1 and M2 cells.
  • To determine if wild-type TACE can rescue the shedding phenotype in mutant cells.
  • To elucidate the importance of early biosynthesis steps in TACE function.

Main Methods:

  • Stable transfection of wild-type TACE into M2 mutant cells.
  • Assessment of TACE processing and cell surface transport.
  • Evaluation of proTGF-alpha and APP shedding rescue in transfected cells.
  • Analysis of TACE in M1 cells and rescue via wild-type TACE transfection.

Main Results:

  • Wild-type TACE, when transfected into M2 cells, was correctly processed, transported to the cell surface, and restored proTGF-alpha and APP shedding.
  • M1 cells were also found to express mutant TACE, and transfection with wild-type TACE rescued the shedding defect.
  • These findings indicate that inactivating mutations in TACE lead to its accumulation in the early secretory pathway.

Conclusions:

  • The study confirms that mutations in TACE are responsible for the shedding defects observed in M1 and M2 cells.
  • Successful rescue by wild-type TACE highlights the critical role of proper TACE biosynthesis and trafficking.
  • The results underscore the significance of the initial stages of TACE biosynthesis for its enzymatic activity and function.

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