Evaluation of Cyclosaplin Efficacy Using a Silk Based 3D Tumor Model

Area of Science:

• Biochemistry
• Oncology
• Biomaterials Science

Background:

• Developing novel anti-cancer peptides necessitates efficient in vitro tumor models that mimic the complex 3D tumor microenvironment.
• Conventional 2D cell cultures fail to replicate the hypoxic and dense proliferative characteristics of in vivo breast carcinoma tissue.
• Three-dimensional (3D) cell constructs offer a more physiologically relevant platform for evaluating anti-cancer agent efficacy.

Purpose of the Study:

• To evaluate the anti-cancer efficacy of the sandalwood-derived peptide, cyclosaplin, against invasive MDA-MB-231 breast cancer cells.
• To compare the response of cancer cells in a 3D silk-based tumor model versus traditional 2D cultures.
• To assess the impact of cyclosaplin on key indicators of cancer cell proliferation and invasiveness, including glucose consumption, lactate dehydrogenase (LDH), and matrix metalloproteinase 9 (MMP-9) activity.

Main Methods:

• Utilized an established in vitro 3D silk breast cancer model with the invasive MDA-MB-231 cell line.
• Assessed the anti-proliferative effects of cyclosaplin using the alamarBlue assay, comparing 3D constructs to conventional 2D cultures.
• Quantified proliferation rates, glucose consumption, LDH, and MMP-9 activity in both 2D and 3D models.
• Performed microscopic analysis to observe morphological changes and cell distribution in cyclosaplin-treated 3D constructs.

Main Results:

• Human breast cancer cells exhibited higher proliferation rates, glucose consumption, LDH, and MMP-9 activity in 3D constructs compared to 2D cultures.
• A higher concentration of cyclosaplin was required to achieve 50% cell death in 3D cultures than in 2D cultures.
• Cyclosaplin treatment significantly reduced MMP-9 activity in MDA-MB-231 cells within the 3D constructs.
• Microscopic examination revealed decreased cell numbers, smaller cell size, and altered morphology in treated cells, with even distribution in scaffolds.

Conclusions:

• The 3D silk breast cancer model provides a more accurate representation of tumor biology than 2D cultures for evaluating anti-cancer agents.
• Cyclosaplin demonstrates significant anti-cancer activity, particularly in reducing MMP-9 activity, within a 3D tumor microenvironment.
• These findings highlight cyclosaplin as a promising candidate for the development of novel anti-cancer therapeutics.