Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 1999 Oct;45(10):1797-802.

Aminopeptidase activities in breast cancer tissue

Affiliations
  • PMID: 10508127

Aminopeptidase activities in breast cancer tissue

J M Martínez et al. Clin Chem. 1999 Oct.

Abstract

Background: Endopeptidases such as cathepsins help determine the prognosis of breast cancer (BC). However, little information is available about the role in BC of aminopeptidases (APs), which have been implicated in the metabolism of several local hormonal factors.

Methods: Using aminoacyl-beta-naphthylamides as substrates, we measured fluorometrically alanyl-AP, arginyl-AP, cystinyl-AP, glutamyl-AP, aspartyl-AP, and pyroglutamyl-AP activities in their soluble and membrane-bound forms in surgically removed BC tissue from which we separated samples of neoplastic, adjacent tumoral, and unaffected surrounding tissue.

Results: Compared with unaffected tissue, neoplastic tissue had significantly higher activities of soluble alanyl-AP (553.9 +/- 82.8 vs 1615.2 +/- 183.0 pmol/mg protein; P <0.001), arginyl-AP (372.4 +/- 56.6 vs 1027.2 +/- 143.5 pmol/mg protein; P <0.001), and cystinyl-AP (74.8 +/- 10.0 vs 282.9 +/- 37.2 pmol/mg protein; P <0.001), and of membrane-bound arginyl-AP (457.7 +/- 97.9 vs 886.6 +/- 140.0 pmol/mg protein; P <0.01). However, membrane-bound aspartyl-AP activity was significantly lower in neoplastic tissue (17.3 +/- 1.4 vs 9.2 +/- 1.2 pmol/mg protein; P <0.05) and pyroglutamyl-AP activity was significantly lower in neoplastic and adjacent tissues (12.8 +/- 0.9 vs 7.0 +/- 1. 2 and 8.0 +/- 1.3 pmol/mg protein; P <0.001 for both comparisons).

Conclusions: The present results document changes in AP activities in BC tissue. These changes may reflect the functional status of the AP substrates, which can be selectively activated or inhibited locally in the affected tissue as a result of specific conditions brought about by the tumor.

PubMed Disclaimer

LinkOut - more resources