Related Experiment Video
Updated: Jul 9, 2025
06:17
A11-positive β-amyloid Oligomer Preparation and Assessment Using Dot Blotting Analysis
Published on: May 22, 2018
11.9K
Bifunctional backbone modified squaramide dipeptides as amyloid beta (Aβ) aggregation inhibitors
Suchita Dattatray Shinde1, Santosh Kumar Behera2, Neeraj Kulkarni1
1Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER)-Ahmedabad, Gujarat 382355, India.
Bioorganic & Medicinal Chemistry
|December 6, 2023
Summary
New bifunctional dipeptides show promise for Alzheimer's disease (AD) treatment by simultaneously inhibiting amyloid beta (Aβ) aggregation and reducing metal ion stress. These compounds also exhibit antioxidant properties, offering a potential therapeutic scaffold.
Area of Science:
- Neuroscience
- Medicinal Chemistry
- Biochemistry
Background:
- Alzheimer's disease (AD) is characterized by amyloid beta (Aβ) plaques and metal ion dysregulation (copper, zinc, iron).
- Simultaneous targeting of Aβ aggregation and metal stress presents a therapeutic strategy for AD.
Purpose of the Study:
- To synthesize and evaluate bifunctional dipeptides with squaramide backbones for their metal chelation and Aβ aggregation inhibitory properties.
- To investigate the therapeutic potential of these dipeptides for Alzheimer's disease.
Main Methods:
- Synthesis of squaramide-modified dipeptides.
- In vitro assays for metal ion chelation and Aβ peptide aggregation inhibition.
- Molecular dynamics (MD) simulations and circular dichroism (CD) spectroscopy.
Main Results:
- Dipeptides with Valine (V) and Threonine (T) substitutions effectively chelated Cu(II), Zn(II), and Fe(III) ions.
- These dipeptides inhibited Aβ peptide aggregation in vitro.
- MD simulations indicated interaction with the Aβ KLVFF region; CD studies showed minor conformational changes.
Conclusions:
- Squaramide-modified dipeptides exhibit dual activity: metal chelation and Aβ aggregation inhibition.
- The identified dipeptides possess antioxidant properties.
- These bifunctional dipeptides represent a promising scaffold for developing novel Alzheimer's disease therapeutics.
