image: Professor Emeritus Eiichi Araki of Kumamoto University, recipient of the Medal of Honor with Purple Ribbon (Shiju Hosho) in the Spring 2026 Conferment.
Credit: Kumamoto University
Kumamoto University is honored to announce that Professor Emeritus Eiichi Araki has been awarded the Medal of Honor with Purple Ribbon (Shiju Hosho) as part of the Spring 2026 Conferment. This prestigious national award is granted by the Government of Japan to individuals who have made extraordinary contributions to academic and scientific development.
Professor Araki is recognized for his transformative work in the field of Diabetology, particularly his pioneering research into insulin signaling and the molecular mechanisms of diabetes.
Deciphering the Language of Insulin
Throughout a career spanning four decades, Professor Araki has been at the forefront of understanding how insulin functions at a molecular level. His key scientific achievements include:
- Discovery of IRS-1 and IRS-2: He played a pivotal role in identifying Insulin Receptor Substrate-1 (IRS-1) and IRS-2, the critical "messenger" molecules that transmit signals from the insulin receptor to the rest of the cell.
- Gene Regulation: He elucidated the transcriptional regulation mechanisms of the insulin receptor gene, providing a fundamental understanding of how cells control their sensitivity to insulin.
- Clinical Impact: By clarifying how defects in these signaling pathways lead to the pathogenesis of diabetes, his research has directly informed the development of novel therapeutic strategies for the disease.
A Legacy of Collaboration
Reflecting on the honor, Professor Araki expressed his gratitude to his mentors and colleagues, including Professor Emeritus Yosuke Ebina (Tokushima University), the late Professor Motoaki Shichiri (Kumamoto University), and Professor C. Ronald Kahn (Joslin Diabetes Center).
"Insulin is a vital hormone, both as a subject of metabolic research and as a life-saving medication," said Professor Araki. "I am deeply gratified to have contributed to uncovering a portion of its mechanism of action. I hope these findings continue to advance the treatment and prevention of diabetes globally."
Strengthening Global Health
The recognition of Professor Araki's work underscores Kumamoto University's commitment to tackling chronic metabolic diseases that affect millions worldwide. His discoveries remain foundational for researchers striving to overcome insulin resistance and improve the lives of patients with diabetes.
About Kumamoto University
Located in the heart of Kyushu, Japan, Kumamoto University is a premier comprehensive national research institution. It offers a vast range of academic disciplines spanning the humanities, social sciences, natural sciences, engineering, and informatics—fields that are currently driving the region's rapid emergence as a global semiconductor hub. While fostering a multi-disciplinary environment, the university is particularly distinguished by its exceptional strength and profound legacy in life sciences and medicine.
The university’s medical roots are deeply intertwined with the spirit of Shibasaburo Kitasato, the world-renowned "Father of Modern Japanese Medicine" and a Kumamoto native. Kitasato’s pioneering work in bacteriology and his philosophy of "translating laboratory science into clinical prevention" continue to define the university's research mission today.
This ecosystem is anchored by world-class centers such as the Institute of Molecular Embryology and Genetics (IMEG) and the International Research Center for Medical Sciences (IRCMS), both of which drive innovation in regenerative medicine and molecular biology. Building on its history as home to a world-leading AIDS research center, the university now hosts the Joint Research Center for Human Retrovirus Infection, an international hub tackling global viral threats—a modern continuation of Kitasato’s legacy in infectious disease control.
Supported by the cutting-edge clinical expertise of Kumamoto University Hospital, the institution remains dedicated to translating fundamental scientific discoveries—like those of Professor Araki in diabetes and metabolism—into transformative medical solutions for global health.