Japanese cell biologist is named 2016 laureate for his discoveries on how the bodyâ€™s cells break down and recycle their own components
October 4, 2016: The Nobel prize in medicine has been awarded to a Japanese cell biologist for discoveries on how cells break down and recycle their own components.
Yoshinori Ohsumi, 71, will receive the prestigious 8m Swedish krona (Â£718,000) award for uncovering â€œmechanisms for autophagyâ€, a fundamental process in cells that scientists believe can be harnessed to fight cancer and dementia.
Autophagy is the bodyâ€™s internal recycling programme – scrap cell components are captured and the useful parts are stripped out to generate energy or build new cells. The process is crucial for preventing cancerous growths, warding off infection and, by maintaining a healthy metabolism, it helps protect against conditions like diabetes.
Dysfunctional autophagy has been linked to Parkinsonâ€™s disease, type 2 diabetes, cancer and a host of age-related disorders. Intense research is underway to develop drugs that can target autophagy to treat various diseases.
Speaking to reporters in Tokyo on Monday, Ohsumi said: â€œAs a boy, the Nobel Prize was a dream, but after starting my research, it was out of my picture.â€
He said he chose to focus on the cellâ€™s waste disposal system, an unfashionable subject at the time, because he wanted to work on something different.
â€œI donâ€™t feel comfortable competing with many people, and instead I find it more enjoyable doing something nobody else is doing,â€ he added. â€œIn a way, thatâ€™s what science is all about, and the joy of finding something inspires me.â€
Ohsumi, who was in his lab when he received the phone call from Thomas Perlmann, secretary of the Nobel Committee, admitted to being in a â€œslight state of shockâ€ about the news.
The word autophagy originates from two Greek words meaning â€œself-eatingâ€. It refers to the process in which cellular junk is captured and sealed in sack-like membranes, called autophagosomes. The sealed contents are transported to another structure called the lysosome, once considered little more than the cellular rubbish bin.
By studying the process in yeast cells, Ohsumi identified the main genes involved in autophagy and showed how the proteins they code for come together to build the autophagosome membrane. He later showed that a similar cellular recycling process occurs in human cells – and that our cells would not survive without it.
Juleen Zierath, a member of the Nobel committee, said: â€œEvery day we need to replace about 200 to 300g of protein in our bodies… We are eating proteins every day, about 70g, but thatâ€™s not enough to take care of the requirement to make new proteins. Because of this machinery, weâ€™re able to rely on some of our own proteins, maybe the damaged proteins or the long-lived proteins, and they are recycled with this sophisticated machinery so that we can sustain and we survive.â€
Professor David Rubinsztein, deputy director of the Cambridge Institute for Medical Research at the University of Cambridge, said that Ohsumiâ€™s discoveries had provided deep insights into the biology underpinning infectious diseases, cancers, Huntingtonâ€™s and Parkinsonâ€™s.
â€œIâ€™m very happy heâ€™s got this yearâ€™s Nobel prize, itâ€™s very well deserved,â€ he said. â€œHis lab mainly works in yeast. They did the initial screens that enabled the discovery of key genes that are involved in autophagy. So many other labs have exploited his discoveries, directly or indirectly, to see why itâ€™s important in diseases.â€
Giovanna Mallucci, a professor of clinical neuroscience at the University of Cambridge, said that Ohsumiâ€™s discoveries were paving the way for new approaches to treating diseases, from cancer to neurodegenerative illnesses.
â€œI think itâ€™s very important that this area of science been recognised,â€ she said. â€œThe important principle here is going for common mechanisms in disease. It opens up avenues to treating these disorders that are different from more conventional disease-specific approaches.â€
Last year, the prize was shared by three scientists for discoveries that helped doctors fight malaria and infections caused by roundworm parasites.
The Chinese chemist, Tu Youyou, was recognised for her discovery of artemisinin, one of the most effective treatments for malaria. Two other researchers, Satoshi ÅŒmura, an expert in soil microbes at Kitasato University, and William Campbell, an Irish-born parasitologist at Drew University in New Jersey, shared the other half of the prize, for the discovery of avermectin, a treatment for roundworm parasites.
The winners of the physics, chemistry and peace prizes are to be announced later this week. The economics prize will be announced on Monday 10 October.