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Structure-Activity Studies on Antiproliferative Factor (APF) Glycooctapeptide Derivatives.

Piotr Kaczmarek¹, Gillian M Tocci², Susan K Keay³

¹Chemical Biology Laboratory, Molecular Discovery Program.

ACS Medicinal Chemistry Letters

|June 6, 2014

Summary

Antiproliferative factor (APF) analogues were studied for their effect on bladder epithelial cell proliferation. The simplest potent analogue, derivative 9, retains antiproliferative activity by replacing a trivaline tail with alanines.

Keywords:

Interstitial cystitis/painful bladder syndrome antiproliferative glycopeptide hydrophobicity peptide conformation

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Area of Science:

Biochemistry
Cell Biology
Urology

Background:

Antiproliferative factor (APF) is a glycopeptide linked to interstitial cystitis/painful bladder syndrome (IC/PBS).
Previous studies showed that unsialylated APF (as-APF) and its truncated form (as-APF8) inhibit bladder epithelial cell proliferation.
Understanding the structure-activity relationship of as-APF is crucial for developing therapeutic strategies.

Purpose of the Study:

To investigate the structural basis for the sustained antiproliferative activity of the truncated eight amino acid as-APF (as-APF8).
To synthesize and evaluate amino acid-substituted derivatives of as-APF8 for their ability to inhibit bladder epithelial cell proliferation.
To determine the solution conformations of these derivatives using biophysical techniques.

Main Methods:

Synthesis of as-APF8 derivatives with specific amino acid substitutions.
In vitro assays to measure the inhibition of bladder epithelial cell proliferation.
Circular Dichroism (CD) and Nuclear Magnetic Resonance (NMR) spectroscopy to analyze solution conformations.

Main Results:

Single amino acid substitutions in as-APF8 generally reduced antiproliferative activity.
Replacing the trivaline tail with three alanines (derivative 9) fully maintained antiproliferative potency.
Derivative 9 represents the simplest, fully potent APF analogue synthesized to date.

Conclusions:

The trivaline tail of as-APF8 is not essential for maintaining antiproliferative activity.
Derivative 9, a simplified analogue, is a promising candidate for further investigation in IC/PBS.
Structural modifications can yield potent APF analogues with potential therapeutic applications.