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Bengt I. Samuelsson, a professor of medical biochemistry and biophysics at the Karolinska Institute, a lipid biochemist and a Nobel laureate died July 5. He was 90, and he had been a member of the 91ÑÇÉ«´«Ã½ since 1976.

Bengt Samuelsson

Samuelsson was born May 21, 1934 in Halmstad, Sweden. He completed undergraduate studies at the University of Lund in southern Sweden and then moved to the Karolinska Institute for graduate work in biochemistry. In 1960, he earned his doctorate under the mentorship of Sune Bergström, studying prostaglandin structural biology, and then in 1961 he obtained a medical degree. In 1962, he briefly moved to Harvard University for a research fellowship in the before returning to the Karolinska Institute in the same year to join the faculty.

Over the next 16 years, Samuelsson worked at multiple institutions including as a visiting professor at Harvard and the Massachusetts Institute of Technology until he became dean of the medical faculty at the Karolinska Institute from 1978 until 1983. Samuelsson shared the with John Vane and his doctoral mentor, Sune Bergström, for their discoveries concerning prostaglandins and related biologically active substances. Then, from 1983 to 1995, Samuelsson served as president of the Karolinska Institute.

Bergström, his doctoral mentor, had also served as both dean and president of the Karolinska Institute, as well as sharing the Nobel Prize. A describes the partnership between Samuelsson and Bergström in detail.

Prostaglandins are a family of oxidized derivatives of arachidonic acid that play crucial roles in various physiological processes, including inflammation, body temperature regulation, thrombosis, and allergic reactions. Samuelsson authored 324 publications that have been cited over 46,000 times and by more than 350 patents. In a paper that has been cited over 1,200 times, he demonstrated that homogenized sheep glands can convert [1-¹⁴C]arachidonic acid to prostaglandins G₂ and H₂. Notably, both of these prostaglandins are known to induce aggregation in human platelets. In a paper that has been cited over 3,600 times, Samuelsson reports the discovery and structure of thromboxane A₂, which is a biologically active compound produced by human platelets during the conversion of prostaglandin G₂ to thromboxane B₂. Ischemic stroke, one of the leading causes of death and disability worldwide,  is particularly associated . Samuelsson’s research on prostaglandins, thromboxane, and related biomolecules, identified the agents and their production processes. This foundational work has later facilitated a deeper understanding of the molecular mechanisms underlying ischemic stroke.

Göran K Hansson, a professor of medicine, talked about the significance of Samuelsson’s work in a .

“Very few scientists can open up a whole new field of knowledge. But that is what Bengt Samuelsson did,” Hansson said. “Based on Ulf von Euler's and Sune Bergström's discovery of prostaglandin, he mapped an entire biochemical continent of signaling molecules in the human body, and found that they are of great importance in the blood circulation, the respiratory system, the genitals, the immune system, the nervous system and almost the entire body.”