Jan-Åke Gustafsson

Jan-Ake Gustafsson was born on 4 August 1943 in Stockholm, Sweden. He studied at Karolinska Institutet, completing a PhD in 1968 and a medical degree in 1971. His doctoral training connected him to the steroid and prostaglandin research milieu around Sune Bergstrom, later a Nobel laureate. Those early years set his course toward molecular endocrinology rather than clinical practice alone.

Gustafsson became professor of medical nutrition at Karolinska Institutet in 1979 and for nearly thirty years headed the Department of Medical Nutrition, later Biosciences and Nutrition. Through the 1970s and 1980s his laboratory purified the glucocorticoid receptor, developed antibodies that enabled cloning, and helped establish nuclear receptors as a gene-regulatory protein class, with key papers in Nature (1984) and Cell (1986).

In the mid-1990s his group discovered estrogen receptor beta, transforming understanding of estrogen action and creating a therapeutic target in breast, prostate, lung and other cancers. Related discoveries included liver X receptor beta and early ligand work on PPAR-alpha. He coordinated European research networks, sat on boards of major journals, and remained scientifically active into the 2020s. From 2008 he split time between KI and the University of Houston as Robert A. Welch Professor of Biology and Biochemistry, founding the Center for Nuclear Receptors and Cell Signaling after a Texas state research grant announced with Governor Rick Perry in 2009.

Beyond the bench, Gustafsson reshaped southern Stockholm's research map. After moving KI work to Huddinge Hospital and Flemingsberg in 1981, he founded Novum Research Park, advanced the case for Södertörn University in the south of the county, and helped seed a biotech cluster. In 1987 he was among the founders of Karo Bio AB, a nuclear-receptor-focused company listed in Stockholm. He married Professor Margaret Warner; they had a son, Jan, and grandchildren. Colleagues described a mentor who treated the world as his workplace and who kept recruiting students and collaborators internationally.

Jan-Ake Gustafsson died on 4 September 2026 at the age of 83. Karolinska Institutet published a memorial recalling him as a forceful scientist, visionary entrepreneur and mentor. No cause of death was detailed in the institute's notice. He is survived by his wife, Professor Margaret Warner, his son Jan, and grandchildren.

Gustafsson's name is tied to the nuclear-receptor era in molecular medicine: receptor purification and cloning, estrogen receptor beta, LXRbeta, and a drug-hunting mindset that linked basic discovery to biotech. Flemingsberg's research park, Södertörn's presence, Karo Bio, Houston's nuclear-receptor center, and a lecture hall named for him at KI's Neo building mark an institutional footprint as durable as his citation record. Membership in the Royal Swedish Academy of Sciences, the U.S. National Academy of Sciences, the American Academy of Arts and Sciences, and service as Nobel Assembly chair at KI placed him among Sweden's most visible biomedical figures of his generation.