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Related Experiment Videos

Diminished prohormone convertase 3 expression (PC1/PC3) inhibits progastrin post-translational processing.

M Sawada1, S Finniss, C J Dickinson

  • 1Department of Pediatrics, The University of Michigan Medical Center, 1150 W. Medical Center Drive, A520 MSRB I, Ann Arbor, MI 48109-0656, USA.

Regulatory Peptides
|April 20, 2000
PubMed
Summary

Prohormone convertase 1/3 (PC1/PC3) processes progastrin in G-cells, generating bioactive gastrin. Inhibiting PC1/PC3 reduced gastrin formation, confirming its role in this essential bioactivation pathway.

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Area of Science:

  • Biochemistry
  • Endocrinology
  • Molecular Biology

Background:

  • Gastrin is synthesized as a precursor requiring endoproteolytic cleavage for bioactivation.
  • Different G-cell types (gastric antral vs. duodenal) process progastrin differently, yielding distinct gastrin forms.
  • Both gastric antral and duodenal G-cells express prohormone convertases PC1/PC3 and PC2.

Purpose of the Study:

  • To confirm that PC1/PC3 is responsible for progastrin processing in AtT-20 cells.
  • To investigate the in vivo role of PC1/PC3 in progastrin processing.
  • To determine the impact of specific progastrin mutations on processing by PC1/PC3.

Main Methods:

  • Heterologous expression of wild-type and mutant human progastrins in AtT-20 cells.
  • Coexpression of progastrin with antisense PC1/PC3 constructs to inhibit PC1/PC3 activity.

Related Experiment Videos

  • Analysis of gastrin processing products (G17-NH(2) and G34-NH(2)) via biochemical assays.

    • Main Results:

    • Inhibition of PC1/PC3 consistently decreased G34-NH(2) formation in AtT-20 cells.
    • Mutating the Lys(74)Lys(75) site to Lys(74)Arg(75) shifted processing towards G17-NH(2) production.
    • PC1/PC3 inhibition did not significantly affect processing at the Lys(74)Arg(75) site.

    Conclusions:

    • PC1/PC3 is a key enzyme in progastrin processing, leading to bioactive gastrin.
    • PC1/PC3 plays a significant role in progastrin processing within G-cells.
    • The processing at the Lys(74)Lys(75) site is primarily mediated by PC1/PC3, while the Lys(74)Arg(75) site may involve other convertases.