Biomimetic gel exhibiting self-beating motion in ATP solution

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Stimuli-responsive polymers and gels are widely explored for artificial muscles and drug delivery.
• Existing systems typically rely on external signals for actuation, limiting autonomous function.
• Mimicking autonomous biological movements, like heart muscle, remains a significant challenge.

Purpose of the Study:

• To develop a novel biomimetic gel capable of autonomous self-beating motion.
• To demonstrate a system that mimics the autonomous contractile behavior of heart muscle.
• To investigate a gel system that operates under constant conditions without external signal switching.

Main Methods:

• Preparation of an anionic polymer gel functionalized with phosphoric groups.
• Immobilization of creatine kinase enzyme within the polymer gel matrix.
• Immersion of the prepared gel in adenosine triphosphate (ATP) solution to initiate enzymatic reactions.

Main Results:

• The gel exhibited autonomous self-beating motion in ATP solution, mimicking heart muscle.
• Enzymatic reactions within the gel led to periodic changes in calcium ion concentration.
• Periodic formation and dissociation of chelates between phosphoric groups and calcium ions caused autonomous swelling and deswelling.

Conclusions:

• A novel biomimetic gel system capable of autonomous, self-oscillating motion has been successfully developed.
• The gel's autonomous beating behavior is driven by an enzyme-catalyzed reaction and ion-binding dynamics.
• This research presents a new paradigm for biomimetic materials that can autonomously replicate biological functions.