Anticancer alpha-helical peptides and structure/function relationships underpinning their interactions with tumour...

Area of Science:

• Biochemistry
• Molecular Biology
• Pharmacology

Background:

• Cancer remains a leading cause of mortality, necessitating novel therapeutic agents.
• Alpha-helical defence peptides (alpha-ACPs), like cecropins, magainins, and aureins, possess antimicrobial and immunomodulatory functions.
• These peptides also exhibit significant anticancer activity (alpha-ACPs).

Purpose of the Study:

• To review recent studies on alpha-ACPs as potential anticancer agents.
• To elucidate the mechanisms underlying the anticancer activity of alpha-ACPs.
• To highlight the structural features crucial for the efficacy of alpha-ACPs.

Main Methods:

• Review of existing scientific literature on alpha-ACPs.
• Analysis of structure-activity relationships of alpha-ACPs.
• Examination of the proposed mechanisms of cancer cell membrane disruption by alpha-ACPs.

Main Results:

• Alpha-ACPs demonstrate selective toxicity towards cancer cells due to differences in membrane surface charge.
• Anticancer activity is observed at micromolar concentrations with minimal haemolysis or mammalian cell toxicity.
• Key structural features, including amphipathicity and hydrophobic arc size, are critical for membrane invasion.

Conclusions:

• Alpha-ACPs disrupt cancer cell membranes, primarily targeting mitochondrial and plasma membrane integrity.
• Mechanisms involve non-receptor-mediated pathways, likely through carpet/toroidal pore models.
• Alpha-ACPs represent promising candidates for novel anticancer drug development, with several already patented.