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PolyU and CUHK jointly develop ABarginase, the first-in-class drug for multiple obesity-related metabolic diseases

22 May 2023

Research & Innovation Department of Applied Biology and Chemical Technology

PolyU-CUHK joint development of the groundbreaking drug ABarginase is awarded a Grand Prize – the International Federation of Inventors’ Associations (IFIA) Best Invention Award at the 48th International Exhibition of Inventions Geneva. Researchers Prof. Thomas Leung of PolyU (left) and Prof. Alisa Shum of CUHK (right) introduced the research project to the media.

The ABarginase project is supported by the Lo Ka Chung Charitable Foundation Limited, the Health and Medical Research Fund of the Health Bureau and the State Key Laboratory of Chemical Biology and Drug Discovery of PolyU. Prof. Thomas Leung (3rd from left) and Prof. Alisa Shum (4th from left) were joined by Mr Lo Pak Shiu (4th from right) and Ms Lo Lai Shan Lisa (3rd from right), Directors of the Lo Ka Chung Charitable Foundation Limited; Prof. Benny Zee, Director of Office of Research and Knowledge Transfer Services, CUHK (2nd from right); Mr Kelvin Wong, Director of Knowledge Transfer and Entrepreneurship, PolyU (2nd from left); Dr Gene Man, Knowledge Transfer Events Manager, CUHK (1st from right) and Dr Leo Lee, Research Assistant Professor of the Department of Applied Biology and Chemical Technology, PolyU (1st from left).

The research project leveraged PolyU’s strengths in protein engineering and drugs development and CUHK’s leading expertise in the studies of obesity and diabetes.

3D molecular models of ABarginase, albumin and FcRn receptor on a cell surface.


Researchers from The Hong Kong Polytechnic University (PolyU) and The Chinese University of Hong Kong (CUHK) have jointly made a groundbreaking drug discovery in treating multiple metabolic diseases related to obesity and insulin resistance like diabetes and fatty liver disease.

The new drug, ABarginase, opens a new path for safe, long-lasting cures to multiple obesity related diseases simultaneously through an ingenious treatment mechanism – arginine starvation. Currently, patients often have to take multiple medications for these inter-related diseases, and are hence more prone to the potential risks of polypharmacy.

ABarginase shows promise for the effective treatment of multiple metabolic diseases including prediabetes, type 2 diabetes and nonalcoholic fatty liver disease. The fabrication process of ABarginase is inexpensive and highly efficient, making it affordable and widely adoptable for clinical applications.

The research is led by Prof. Thomas LEUNG Yun-chung, Professor of the Department of Applied Biology and Chemical Technology and Lo Ka Chung Charitable Foundation Professor in Pharmaceutical Sciences of PolyU, and Prof. Alisa SHUM Sau-wun, Associate Professor, School of Biomedical Sciences of the Faculty of Medicine of CUHK.

Obesity is not just about being fat. It is associated with many chronic diseases, such as diabetes, nonalcoholic fatty liver disease, heart disease, hypertension and cancer. The PolyU-CUHK research team discovered that a low level of arginine (a semi-essential amino acid) in the blood can suppress fat synthesis, promote fat breakdown and sensitise cells to insulin. Native arginase can break down arginine, but it has a short circulatory half-life of less than 30 minutes.

Prof. Thomas Leung said, “By using an advanced fusion protein strategy, our research team developed a long-lasting recombinant human arginase, ABarginase, that contains an albumin-binding domain, which enables it to bind with the stable and abundant albumin in the blood stream to extend its half-life by about 200 folds. ABarginase exhibits strong catabolic activity and it would only require one dose of ABarginase a week to maintain circulating arginine at low levels to achieve arginine starvation.”

In preclinical studies, diet-induced obese mice were injected with ABarginase once a week, while control mice were injected with saline. Researchers found that within eight weeks of treatment with ABarginase, the treatment group’s body weight, fat mass, fatty liver and characteristic features of diabetes such as high blood glucose, insulin resistance and glucose intolerance were entirely reversed.

Prof. Alisa Shum said, “The promising results show that ABarginase has great potential in safely and effectively treating multiple metabolic diseases related to obesity, insulin resistance, diabetes, and most importantly nonalcoholic fatty liver disease, which has no FDA-approved drug so far. We may have found the one drug that can cure them all.”

Patent applications for this invention were filed in multiple countries. The research team is now scaling up the production for manufacturing ABarginase at Good Manufacturing Practices (GMP) grade in preparation for conducting clinical trials.

Prof. Leung and Prof. Shum further added, “As scientists, we dream of building a better world. The successful development of ABarginase is an important step towards realising our dream.”

In an affirmation of its potential benefit to patients and positive impact on global health, as well as a testament to the research excellence of inter-university collaboration, ABarginase recently won one of the two prestigious Grand Prizes awarded to Hong Kong in this year’s International Exhibition of Inventions Geneva – the International Federation of Inventors’ Associations (IFIA) Best Invention Award.

Obesity is generally recognised as a global health problem. According to the latest data of the World Health Organization, more than 1.9 billion adults were overweight and over 650 million adults were obese in 2016, accounting for 39% and 13% of the world’s adult population. While in Hong Kong, about one in two adults are considered to be overweight or obese.

The joint research project is supported by the Lo Ka Chung Charitable Foundation Limited, the Health and Medical Research Fund of the Health Bureau and the State Key Laboratory of Chemical Biology and Drug Discovery of PolyU.

 

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Press Contacts

Matt Ho

Senior Manager, Communications and Public Affairs, The Hong Kong Polytechnic University

Press Contacts

Sophie Pang

Executive, Communications and Public Relations Office, The Chinese University of Hong Kong

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