1. Can you please briefly summarize the paper? 

Thank you for giving me the opportunity to introduce my article. Hypoxia is a key factor in various diseases, including peripheral arterial disease (PAD) and critical limb ischemia. As a result, there is a need for the development of a multifunctional technology that can both detect and treat ischemia, with the ability to show hypoxia-responsive changes in mechaophysical properties, ROS-scavenging activity, and naked eye visual detection, facilitating diagnosis and therapeutic applications. Hydrogel biosensors, modified with stimuli-responsive nanoparticles and oxygen-sensitive components, offer a simple, practical approach for diagnosis and detection with naked-eye visibility. In this work, we developed a pyrogallol-modified hypoxia-sensitive (HS-PD) hydrogel, functionalized with diselenide-PD, which exhibits distinctive fluorescent, electroconductive, and mechanical responses under ischemic and non-ischemic conditions, while promoting muscle recovery. Ischemia-induced ROS cleave the diselenide bonds, triggering fluorescence restoration and modifying the hydrogel’s mechanical properties. Additionally, the oxidation sensitivity of the pyrogallol component influences the electrical and mechanical characteristics of the hydrogel. Furthermore, the ROS-scavenging ability of the HS-PD hydrogel reduces tissue damage and supports tissue regeneration. By integrating both diagnostic and therapeutic functions, the HS-PD hydrogel provides a comprehensive solution for monitoring and treating muscle ischemia.

2. Can you please tell us the main difficulties you had in the laboratory work and how you overcame them?

The main challenge I faced was optimizing the pyrogallol and ROS-responsive polymer dot amount while fabricating the HS-PD hydrogel. Several trials were carried out to obtain the optimal hypoxic-sensitive ability and ROS-scavenging capability of the fabricated hydrogel. After several experimental trials, the desired ratio was achieved and was used for subsequent experimentation work.

3. Please introduce your laboratory, university or organization to bio-researchers in Korea.

The Functional Biomaterials Lab at Korea National University of Transportation in Chungju, led by Prof. Sung Young Park, focuses on developing smart, stimuli-responsive biosensors-ranging from nanoparticles to hydrogels-for efficient and user-friendly disease theragnostics, targeting conditions such as cancer, skeletal muscle ischemia, and bacterial infections. These materials interact selectively with disease-associated biomarkers and stimuli such as ROS, GSH, pH, enzymes, triggering specific changes in their physicochemical and mechanical properties, such as fluorescence “on/off” phenomenon, electrical conductivity, and viscoelasticity. These changes serve both as diagnostic indicators thereby enhancing therapeutic outcomes.

4. Please tell us your experiences and your thoughts related to research activities abroad.

My experience as a researcher in a foreign country has given me valuable exposure to diverse cultures, new ideas, and collaborative work environments. I have had the opportunity to interact with professionals and scholars from around the world. Additionally, attending national and international conferences and symposiums has helped me connect with individuals from various fields, exchanging ideas, knowledge, and multi-cultural experiences. As a researcher, this exposure has been instrumental in my growth both as a person and as a scientist. Throughout my research career, collaborating with different people and sharing perspectives has greatly contributed to my development.

5. Can you provide some advice for younger scientists who have plans to study abroad?

To all the young aspiring scientists planning to study abroad, my advice is to take that leap of faith. The exposure to new ideas and experiences will not only enhance your growth as a researcher but will also help you develop as an individual. Stepping out of your comfort zone can be difficult, but once you do, you'll realize that life holds so much more. Meeting new people, experiencing different cultures, and facing challenges independently will shape you both professionally and personally. So, I encourage all young scientists to keep pushing forward. When you face a challenge, look for a solution-don’t avoid the problem. You can’t run from every obstacle, because there will always be another one waiting. I believe it's these challenges that truly make life meaningful. So, never give up.

6. Future plan?

After completing my Ph.D., I intend to pursue a postdoctoral position, either in Korea or abroad. In the long term, my goal is to establish my own research laboratory at a reputable institution, where I can mentor future generations of researchers, foster high-quality scientific work, and continue making meaningful contributions to society.

7. Do you have anything else that you would like to tell Korean scientists and students?

To all the Korean scientists and students, I would like to advise never to give up on your goals. Challenges are inevitable, but always keep in mind that “this too shall pass”- whether in good times or bad. Engage and collaborate with people from different backgrounds and cultures; doing so will not only broaden your perspective and inspire diverse ideas, but also foster personal growth through exposure to a variety of worldviews.